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+    <title>Authenticated encryption with associated data (AEAD) &#8212; PSA Crypto API 1.0.0 documentation</title>
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+  <div class="section" id="authenticated-encryption-with-associated-data-aead">
+<span id="aead"></span><h1>Authenticated encryption with associated data (AEAD)</h1>
+<div class="section" id="aead-algorithms">
+<span id="id1"></span><h2>AEAD algorithms</h2>
+<div class="section" id="PSA_ALG_CCM">
+<span id="c.PSA_ALG_CCM"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CCM</span></code> (macro)</h3>
+<p>The CCM authenticated encryption algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CCM" title="PSA_ALG_CCM">PSA_ALG_CCM</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x05500100)
+</pre>
+<p>The underlying block cipher is determined by the key type.</p>
+</div>
+<div class="section" id="PSA_ALG_GCM">
+<span id="c.PSA_ALG_GCM"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_GCM</span></code> (macro)</h3>
+<p>The GCM authenticated encryption algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_GCM" title="PSA_ALG_GCM">PSA_ALG_GCM</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x05500200)
+</pre>
+<p>The underlying block cipher is determined by the key type.</p>
+</div>
+<div class="section" id="PSA_ALG_CHACHA20_POLY1305">
+<span id="c.PSA_ALG_CHACHA20_POLY1305"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CHACHA20_POLY1305</span></code> (macro)</h3>
+<p>The Chacha20-Poly1305 AEAD algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CHACHA20_POLY1305" title="PSA_ALG_CHACHA20_POLY1305">PSA_ALG_CHACHA20_POLY1305</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x05100500)
+</pre>
+<p>The ChaCha20_Poly1305 construction is defined in <a class="reference external" href="https://tools.ietf.org/html/rfc7539.html">RFC 7539</a>.</p>
+<p>Variants of this algorithm are defined by the length of the nonce:</p>
+<ul class="simple">
+<li>Implementations must support a 12-byte nonce, as defined in <a class="reference external" href="https://tools.ietf.org/html/rfc7539.html">RFC 7539</a>.</li>
+<li>Implementations can optionally support an 8-byte nonce, the original variant.</li>
+<li>It is recommended that implementations do not support other sizes of nonce.</li>
+</ul>
+<p>Implementations must support 16-byte tags. It is recommended that truncated tag sizes are rejected.</p>
+</div>
+<div class="section" id="PSA_ALG_AEAD_WITH_SHORTENED_TAG">
+<span id="c.PSA_ALG_AEAD_WITH_SHORTENED_TAG"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_SHORTENED_TAG</span></code> (macro)</h3>
+<p>Macro to build a AEAD algorithm with a shortened tag.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_SHORTENED_TAG" title="PSA_ALG_AEAD_WITH_SHORTENED_TAG">PSA_ALG_AEAD_WITH_SHORTENED_TAG</a>(aead_alg, tag_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">aead_alg</span></code></dt>
+<dd>An AEAD algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a> such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">tag_length</span></code></dt>
+<dd>Desired length of the authentication tag in bytes.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding AEAD algorithm with the specified tag length.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported AEAD algorithm or if <code class="docutils literal"><span class="pre">tag_length</span></code> is not valid for the specified AEAD algorithm.</p>
+<p class="rubric">Description</p>
+<p>An AEAD algorithm with a shortened tag is similar to the corresponding AEAD algorithm, but has an authentication tag that consists of fewer bytes. Depending on the algorithm, the tag length might affect the calculation of the ciphertext.</p>
+<p>The AEAD algorithm with a default length tag can be recovered using <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG" title="PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG()</span></code></a>.</p>
+</div>
+</div>
+<div class="section" id="single-part-aead-functions">
+<h2>Single-part AEAD functions</h2>
+<div class="section" id="psa_aead_encrypt">
+<span id="c.psa_aead_encrypt"></span><h3><code class="docutils literal"><span class="pre">psa_aead_encrypt</span></code> (function)</h3>
+<p>Process an authenticated encryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt">psa_aead_encrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                              <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                              const uint8_t * nonce,
+                              size_t nonce_length,
+                              const uint8_t * additional_data,
+                              size_t additional_data_length,
+                              const uint8_t * plaintext,
+                              size_t plaintext_length,
+                              uint8_t * ciphertext,
+                              size_t ciphertext_size,
+                              size_t * ciphertext_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
+<dd>Nonce or IV to use.</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer in bytes. This must be appropriate for the selected algorithm. The default nonce size is <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">additional_data</span></code></dt>
+<dd>Additional data that will be authenticated but not encrypted.</dd>
+<dt> <code class="docutils literal"><span class="pre">additional_data_length</span></code></dt>
+<dd>Size of <code class="docutils literal"><span class="pre">additional_data</span></code> in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext</span></code></dt>
+<dd>Data that will be authenticated and encrypted.</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
+<dd>Size of <code class="docutils literal"><span class="pre">plaintext</span></code> in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext</span></code></dt>
+<dd>Output buffer for the authenticated and encrypted data. The additional data is not part of this output. For algorithms where the encrypted data and the authentication tag are defined as separate outputs, the authentication tag is appended to the encrypted data.</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">plaintext_length</span></code><code class="docutils literal"><span class="pre">)</span></code>  where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">plaintext_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum ciphertext size of any supported AEAD encryption.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
+<dd>On success, the size of the output in the <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">ciphertext_size</span></code> is too small. <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+</div>
+<div class="section" id="psa_aead_decrypt">
+<span id="c.psa_aead_decrypt"></span><h3><code class="docutils literal"><span class="pre">psa_aead_decrypt</span></code> (function)</h3>
+<p>Process an authenticated decryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt">psa_aead_decrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                              <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                              const uint8_t * nonce,
+                              size_t nonce_length,
+                              const uint8_t * additional_data,
+                              size_t additional_data_length,
+                              const uint8_t * ciphertext,
+                              size_t ciphertext_length,
+                              uint8_t * plaintext,
+                              size_t plaintext_size,
+                              size_t * plaintext_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
+<dd>Nonce or IV to use.</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer in bytes. This must be appropriate for the selected algorithm. The default nonce size is <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">additional_data</span></code></dt>
+<dd>Additional data that has been authenticated but not encrypted.</dd>
+<dt> <code class="docutils literal"><span class="pre">additional_data_length</span></code></dt>
+<dd>Size of <code class="docutils literal"><span class="pre">additional_data</span></code> in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext</span></code></dt>
+<dd>Data that has been authenticated and encrypted. For algorithms where the encrypted data and the authentication tag are defined as separate inputs, the buffer must contain the encrypted data followed by the authentication tag.</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
+<dd>Size of <code class="docutils literal"><span class="pre">ciphertext</span></code> in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext</span></code></dt>
+<dd>Output buffer for the decrypted data.</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">ciphertext_length</span></code><code class="docutils literal"><span class="pre">)</span></code>  where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">ciphertext_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum plaintext size of any supported AEAD decryption.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
+<dd>On success, the size of the output in the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The ciphertext is not authentic.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">plaintext_size</span></code> is too small. <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+</div>
+</div>
+<div class="section" id="multi-part-aead-operations">
+<h2>Multi-part AEAD operations</h2>
+<div class="admonition warning" id="aead-multi-part-warning">
+<p class="first admonition-title">Warning</p>
+<p>When decrypting using a multi-part AEAD operation, there is no guarantee that the input or output is valid until <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> has returned <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SUCCESS</span></code></a>.</p>
+<p>A call to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> or <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> returning <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SUCCESS</span></code></a> <strong>does not</strong> indicate that the input and output is valid.</p>
+<p>Until an application calls <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> and it has returned <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SUCCESS</span></code></a>, the following rules apply to input and output data from a multi-part AEAD operation:</p>
+<ul class="simple">
+<li>Do not trust the input. If the application takes any action that depends on the input data, this action will need to be undone if the input turns out to be invalid.</li>
+<li>Store the output in a confidential location. In particular, the application must not copy the output to a memory or storage space which is shared.</li>
+<li>Do not trust the output. If the application takes any action that depends on the tentative decrypted data, this action will need to be undone if the input turns out to be invalid. Furthermore, if an adversary can observe that this action took place, for example, through timing, they might be able to use this fact as an oracle to decrypt any message encrypted with the same key.</li>
+</ul>
+<p class="last">An application that does not follow these rules might be vulnerable to maliciously constructed AEAD input data.</p>
+</div>
+<div class="section" id="psa_aead_operation_t">
+<span id="c.psa_aead_operation_t"></span><h3><code class="docutils literal"><span class="pre">psa_aead_operation_t</span></code> (type)</h3>
+<p>The type of the state object for multi-part AEAD operations.</p>
+<pre class="literal-block">
+typedef <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-type"><span class="std std-ref">/* implementation-defined type */</span></a></em> <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a>;
+</pre>
+<p>Before calling any function on an AEAD operation object, the application must initialize it by any of the following means:</p>
+<ul>
+<li><p class="first">Set the object to all-bits-zero, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation;
+memset(&amp;operation, 0, sizeof(operation));
+</pre>
+</li>
+<li><p class="first">Initialize the object to logical zero values by declaring the object as static or global without an explicit initializer, for example:</p>
+<pre class="literal-block">
+static <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation;
+</pre>
+</li>
+<li><p class="first">Initialize the object to the initializer <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code></a>, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation = <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT">PSA_AEAD_OPERATION_INIT</a>;
+</pre>
+</li>
+<li><p class="first">Assign the result of the function <a class="reference internal" href="#c.psa_aead_operation_init" title="psa_aead_operation_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_operation_init()</span></code></a> to the object, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation;
+operation = <a class="reference internal" href="#c.psa_aead_operation_init" title="psa_aead_operation_init">psa_aead_operation_init</a>();
+</pre>
+</li>
+</ul>
+<p>This is an implementation-defined type. Applications that make assumptions about the content of this object will result in in implementation-specific behavior, and are non-portable.</p>
+</div>
+<div class="section" id="PSA_AEAD_OPERATION_INIT">
+<span id="c.PSA_AEAD_OPERATION_INIT"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code> (macro)</h3>
+<p>This macro returns a suitable initializer for an AEAD operation object of type <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT">PSA_AEAD_OPERATION_INIT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+</div>
+<div class="section" id="psa_aead_operation_init">
+<span id="c.psa_aead_operation_init"></span><h3><code class="docutils literal"><span class="pre">psa_aead_operation_init</span></code> (function)</h3>
+<p>Return an initial value for an AEAD operation object.</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> <a class="reference internal" href="#c.psa_aead_operation_init" title="psa_aead_operation_init">psa_aead_operation_init</a>(void);
+</pre>
+<p class="rubric">Returns: <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="docutils literal"><span class="pre">psa_aead_operation_t</span></code></a></p>
+</div>
+<div class="section" id="psa_aead_encrypt_setup">
+<span id="c.psa_aead_encrypt_setup"></span><h3><code class="docutils literal"><span class="pre">psa_aead_encrypt_setup</span></code> (function)</h3>
+<p>Set the key for a multi-part authenticated encryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup">psa_aead_encrypt_setup</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                                    <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                    <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The sequence of operations to encrypt a message with authentication is as follows:</p>
+<ol class="arabic simple">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> to specify the algorithm and key.</li>
+<li>If needed, call <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> to specify the length of the inputs to the subsequent calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>. See the documentation of <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> for details.</li>
+<li>Call either <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a> to generate or set the nonce. It is recommended to use <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> unless the protocol being implemented requires a specific nonce value.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> zero, one or more times, passing a fragment of the non-encrypted additional authenticated data each time.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> zero, one or more times, passing a fragment of the message to encrypt each time.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a> at any time after the operation has been initialized.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_aead_decrypt_setup">
+<span id="c.psa_aead_decrypt_setup"></span><h3><code class="docutils literal"><span class="pre">psa_aead_decrypt_setup</span></code> (function)</h3>
+<p>Set the key for a multi-part authenticated decryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup">psa_aead_decrypt_setup</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                                    <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                    <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The sequence of operations to decrypt a message with authentication is as follows:</p>
+<ol class="arabic simple">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a> to specify the algorithm and key.</li>
+<li>If needed, call <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> to specify the length of the inputs to the subsequent calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>. See the documentation of <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> for details.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a> with the nonce for the decryption.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> zero, one or more times, passing a fragment of the non-encrypted additional authenticated data each time.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> zero, one or more times, passing a fragment of the ciphertext to decrypt each time.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>.</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a> at any time after the operation has been initialized.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_aead_generate_nonce">
+<span id="c.psa_aead_generate_nonce"></span><h3><code class="docutils literal"><span class="pre">psa_aead_generate_nonce</span></code> (function)</h3>
+<p>Generate a random nonce for an authenticated encryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce">psa_aead_generate_nonce</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                                     uint8_t * nonce,
+                                     size_t nonce_size,
+                                     size_t * nonce_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
+<dd>Buffer where the generated nonce is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce_size</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer in bytes. This must be at least <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">alg</span></code> are type of key and the algorithm respectively that were used to set up the AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
+<dd>On success, the number of bytes of the generated nonce.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be an active AEAD encryption operation, with no nonce set.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_NONCE_MAX_SIZE" title="PSA_AEAD_NONCE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function generates a random nonce for the authenticated encryption operation with an appropriate size for the chosen algorithm, key type and key size.</p>
+<p>The application must call <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> before calling this function.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_aead_set_nonce">
+<span id="c.psa_aead_set_nonce"></span><h3><code class="docutils literal"><span class="pre">psa_aead_set_nonce</span></code> (function)</h3>
+<p>Set the nonce for an authenticated encryption or decryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce">psa_aead_set_nonce</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                                const uint8_t * nonce,
+                                size_t nonce_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
+<dd>Buffer containing the nonce to use.</dd>
+<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
+<dd>Size of the nonce in bytes. This must be a valid nonce size for the chosen algorithm. The default nonce size is <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">alg</span></code> are type of key and the algorithm respectively that were used to set up the AEAD operation.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active, with no nonce set.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The size of <code class="docutils literal"><span class="pre">nonce</span></code> is not acceptable for the chosen algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function sets the nonce for the authenticated encryption or decryption operation.</p>
+<p>The application must call <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a> before calling this function.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">When encrypting, <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> is recommended instead of using this function, unless implementing a protocol that requires a non-random IV.</p>
+</div>
+</div>
+<div class="section" id="psa_aead_set_lengths">
+<span id="c.psa_aead_set_lengths"></span><h3><code class="docutils literal"><span class="pre">psa_aead_set_lengths</span></code> (function)</h3>
+<p>Declare the lengths of the message and additional data for AEAD.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths">psa_aead_set_lengths</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                                  size_t ad_length,
+                                  size_t plaintext_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">ad_length</span></code></dt>
+<dd>Size of the non-encrypted additional authenticated data in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
+<dd>Size of the plaintext to encrypt in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active, and <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> must not have been called yet.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>At least one of the lengths is not acceptable for the chosen algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call this function before calling <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> or <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> if the algorithm for the operation requires it. If the algorithm does not require it, calling this function is optional, but if this function is called then the implementation must enforce the lengths.</p>
+<p>This function can be called before or after setting the nonce with <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a>.</p>
+<ul class="simple">
+<li>For <a class="reference internal" href="#c.PSA_ALG_CCM" title="PSA_ALG_CCM"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_CCM</span></code></a>, calling this function is required.</li>
+<li>For the other AEAD algorithms defined in this specification, calling this function is not required.</li>
+<li>For vendor-defined algorithm, refer to the vendor documentation.</li>
+</ul>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_aead_update_ad">
+<span id="c.psa_aead_update_ad"></span><h3><code class="docutils literal"><span class="pre">psa_aead_update_ad</span></code> (function)</h3>
+<p>Pass additional data to an active AEAD operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad">psa_aead_update_ad</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                                const uint8_t * input,
+                                size_t input_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the fragment of additional data.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd><p class="first">Success.</p>
+<div class="last admonition warning">
+<p class="first admonition-title">Warning</p>
+<p>When decrypting, do not trust the input until <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> succeeds.</p>
+<p class="last">See the <a class="reference internal" href="#aead-multi-part-warning"><span class="std std-ref">detailed warning</span></a>.</p>
+</div>
+</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active, have a nonce set, have lengths set if required by the algorithm, and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> must not have been called yet.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total input length overflows the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Additional data is authenticated, but not encrypted.</p>
+<p>This function can be called multiple times to pass successive fragments of the additional data. This function must not be called after passing data to encrypt or decrypt with <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</p>
+<p>The following must occur before calling this function:</p>
+<ol class="arabic simple">
+<li>Call either <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>.</li>
+<li>Set the nonce with <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a>.</li>
+</ol>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_aead_update">
+<span id="c.psa_aead_update"></span><h3><code class="docutils literal"><span class="pre">psa_aead_update</span></code> (function)</h3>
+<p>Encrypt or decrypt a message fragment in an active AEAD operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update">psa_aead_update</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                             const uint8_t * input,
+                             size_t input_length,
+                             uint8_t * output,
+                             size_t output_size,
+                             size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message fragment to encrypt or decrypt.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the output is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
+<li><a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum output size of any supported AEAD algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd><p class="first">Success.</p>
+<div class="last admonition warning">
+<p class="first admonition-title">Warning</p>
+<p>When decrypting, do not use the output until <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> succeeds.</p>
+<p class="last">See the <a class="reference internal" href="#aead-multi-part-warning"><span class="std std-ref">detailed warning</span></a>.</p>
+</div>
+</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active, have a nonce set, and have lengths set if required by the algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> so far is less than the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total input length overflows the plaintext length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The following must occur before calling this function:</p>
+<ol class="arabic simple">
+<li>Call either <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>. The choice of setup function determines whether this function encrypts or decrypts its input.</li>
+<li>Set the nonce with <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> to pass all the additional data.</li>
+</ol>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
+<p>This function does not require the input to be aligned to any particular block boundary. If the implementation can only process a whole block at a time, it must consume all the input provided, but it might delay the end of the corresponding output until a subsequent call to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>, <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a> or <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> provides sufficient input. The amount of data that can be delayed in this way is bounded by <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_aead_finish">
+<span id="c.psa_aead_finish"></span><h3><code class="docutils literal"><span class="pre">psa_aead_finish</span></code> (function)</h3>
+<p>Finish encrypting a message in an AEAD operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish">psa_aead_finish</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                             uint8_t * ciphertext,
+                             size_t ciphertext_size,
+                             size_t * ciphertext_length,
+                             uint8_t * tag,
+                             size_t tag_size,
+                             size_t * tag_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext</span></code></dt>
+<dd>Buffer where the last part of the ciphertext is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
+<li><a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported AEAD algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
+<dd>On success, the number of bytes of returned ciphertext.</dd>
+<dt> <code class="docutils literal"><span class="pre">tag</span></code></dt>
+<dd>Buffer where the authentication tag is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">tag_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">tag</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>The exact tag size is <a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are the type and bit-size of the key, and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used in the call to <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>.</li>
+<li><a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code></a> evaluates to the maximum tag size of any supported AEAD algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">tag_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned tag.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be an active encryption operation with a nonce set.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">ciphertext</span></code> or <code class="docutils literal"><span class="pre">tag</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer size.
+<a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code></a> can be used to determine the required <code class="docutils literal"><span class="pre">tag</span></code> buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> so far is less than the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> so far is less than the plaintext length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The operation must have been set up with <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>.</p>
+<p>This function finishes the authentication of the additional data formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> with the plaintext formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</p>
+<p>This function has two output buffers:</p>
+<ul class="simple">
+<li><code class="docutils literal"><span class="pre">ciphertext</span></code> contains trailing ciphertext that was buffered from preceding calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</li>
+<li><code class="docutils literal"><span class="pre">tag</span></code> contains the authentication tag.</li>
+</ul>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_aead_verify">
+<span id="c.psa_aead_verify"></span><h3><code class="docutils literal"><span class="pre">psa_aead_verify</span></code> (function)</h3>
+<p>Finish authenticating and decrypting a message in an AEAD operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify">psa_aead_verify</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
+                             uint8_t * plaintext,
+                             size_t plaintext_size,
+                             size_t * plaintext_length,
+                             const uint8_t * tag,
+                             size_t tag_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active AEAD operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext</span></code></dt>
+<dd>Buffer where the last part of the plaintext is to be written. This is the remaining data from previous calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> that could not be processed until the end of the input.</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
+<li><a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported AEAD algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
+<dd>On success, the number of bytes of returned plaintext.</dd>
+<dt> <code class="docutils literal"><span class="pre">tag</span></code></dt>
+<dd>Buffer containing the authentication tag.</dd>
+<dt> <code class="docutils literal"><span class="pre">tag_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">tag</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The calculations were successful, but the authentication tag is not correct.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be an active decryption operation with a nonce set.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> so far is less than the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> so far is less than the plaintext length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The operation must have been set up with <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>.</p>
+<p>This function finishes the authenticated decryption of the message components:</p>
+<ul class="simple">
+<li>The additional data consisting of the concatenation of the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a>.</li>
+<li>The ciphertext consisting of the concatenation of the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</li>
+<li>The tag passed to this function call.</li>
+</ul>
+<p>If the authentication tag is correct, this function outputs any remaining plaintext and reports success. If the authentication tag is not correct, this function returns <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a>.</p>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Implementations must make the best effort to ensure that the comparison between the actual tag and the expected tag is performed in constant time.</p>
+</div>
+</div>
+<div class="section" id="psa_aead_abort">
+<span id="c.psa_aead_abort"></span><h3><code class="docutils literal"><span class="pre">psa_aead_abort</span></code> (function)</h3>
+<p>Abort an AEAD operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort">psa_aead_abort</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Initialized AEAD operation.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Aborting an operation frees all associated resources except for the <code class="docutils literal"><span class="pre">operation</span></code> object itself. Once aborted, the operation object can be reused for another operation by calling <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a> again.</p>
+<p>This function can be called any time after the operation object has been initialized as described in <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>.</p>
+<p>In particular, calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a> after the operation has been terminated by a call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>, <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a> or <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> is safe and has no effect.</p>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER">
+<span id="c.PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER</span></code> (macro)</h3>
+<p>Whether the specified algorithm is an AEAD mode on a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER" title="PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER">PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an AEAD algorithm which is an AEAD mode based on a block cipher, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
+<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG">
+<span id="c.PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG</span></code> (macro)</h3>
+<p>An AEAD algorithm with the default tag length.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG" title="PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG</a>(aead_alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">aead_alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding AEAD algorithm with the default tag length for that algorithm.</p>
+<p class="rubric">Description</p>
+<p>This macro can be used to construct the AEAD algorithm with default tag length from an AEAD algorithm with a shortened tag. See also <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_SHORTENED_TAG" title="PSA_ALG_AEAD_WITH_SHORTENED_TAG"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_SHORTENED_TAG()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_ENCRYPT_OUTPUT_SIZE">
+<span id="c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>The maximum size of the output of <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</a>(key_type, alg, plaintext_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
+<dd>Size of the plaintext in bytes.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The AEAD ciphertext size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the ciphertext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a> will not fail due to an insufficient buffer size. Depending on the algorithm, the actual size of the ciphertext might be smaller.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE">
+<span id="c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</a>(plaintext_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
+<dd>Size of the plaintext in bytes.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>If the size of the ciphertext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_DECRYPT_OUTPUT_SIZE">
+<span id="c.PSA_AEAD_DECRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>The maximum size of the output of <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE">PSA_AEAD_DECRYPT_OUTPUT_SIZE</a>(key_type, alg, ciphertext_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
+<dd>Size of the ciphertext in bytes.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The AEAD plaintext size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the plaintext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a> will not fail due to an insufficient buffer size. Depending on the algorithm, the actual size of the plaintext might be smaller.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE">
+<span id="c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</a>(ciphertext_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
+<dd>Size of the ciphertext in bytes.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>If the size of the plaintext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_NONCE_LENGTH">
+<span id="c.PSA_AEAD_NONCE_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code> (macro)</h3>
+<p>The default nonce size for an AEAD algorithm, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH">PSA_AEAD_NONCE_LENGTH</a>(key_type, alg) <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The default nonce size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>This macro can be used to allocate a buffer of sufficient size to store the nonce output from <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a>.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_NONCE_MAX_SIZE" title="PSA_AEAD_NONCE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_NONCE_MAX_SIZE">
+<span id="c.PSA_AEAD_NONCE_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code> (macro)</h3>
+<p>The maximum nonce size for all supported AEAD algorithms, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_NONCE_MAX_SIZE" title="PSA_AEAD_NONCE_MAX_SIZE">PSA_AEAD_NONCE_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_UPDATE_OUTPUT_SIZE">
+<span id="c.PSA_AEAD_UPDATE_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE">PSA_AEAD_UPDATE_OUTPUT_SIZE</a>(key_type, alg, input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient output buffer size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> will not fail due to an insufficient buffer size. The actual size of the output might be smaller in any given call.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE">
+<span id="c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</a>(input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> will not fail due to an insufficient buffer size.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_FINISH_OUTPUT_SIZE">
+<span id="c.PSA_AEAD_FINISH_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>A sufficient ciphertext buffer size for <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE">PSA_AEAD_FINISH_OUTPUT_SIZE</a>(key_type, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient ciphertext buffer size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the ciphertext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a> will not fail due to an insufficient ciphertext buffer size. The actual size of the output might be smaller in any given call.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE">
+<span id="c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient ciphertext buffer size for <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_TAG_LENGTH">
+<span id="c.PSA_AEAD_TAG_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH</span></code> (macro)</h3>
+<p>The length of a tag for an AEAD algorithm, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH">PSA_AEAD_TAG_LENGTH</a>(key_type, key_bits, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>The type of the AEAD key.</dd>
+<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
+<dd>The size of the AEAD key in bits.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The tag length for the specified algorithm and key.
+If the AEAD algorithm does not have an identified tag that can be distinguished from the rest of the ciphertext, return <code class="docutils literal"><span class="pre">0</span></code>. If the AEAD algorithm is not recognized, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for an AEAD algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>This macro can be used to allocate a buffer of sufficient size to store the tag output from <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_TAG_MAX_SIZE">
+<span id="c.PSA_AEAD_TAG_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code> (macro)</h3>
+<p>The maximum tag size for all supported AEAD algorithms, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE">PSA_AEAD_TAG_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_VERIFY_OUTPUT_SIZE">
+<span id="c.PSA_AEAD_VERIFY_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>A sufficient plaintext buffer size for <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE">PSA_AEAD_VERIFY_OUTPUT_SIZE</a>(key_type, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient plaintext buffer size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the plaintext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> will not fail due to an insufficient plaintext buffer size. The actual size of the output might be smaller in any given call.</p>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE">
+<span id="c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient plaintext buffer size for <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Authenticated encryption with associated data (AEAD)</a><ul>
+<li><a class="reference internal" href="#aead-algorithms">AEAD algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_CCM"><code class="docutils literal"><span class="pre">PSA_ALG_CCM</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_GCM"><code class="docutils literal"><span class="pre">PSA_ALG_GCM</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_CHACHA20_POLY1305"><code class="docutils literal"><span class="pre">PSA_ALG_CHACHA20_POLY1305</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_AEAD_WITH_SHORTENED_TAG"><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_SHORTENED_TAG</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#single-part-aead-functions">Single-part AEAD functions</a><ul>
+<li><a class="reference internal" href="#psa_aead_encrypt"><code class="docutils literal"><span class="pre">psa_aead_encrypt</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_decrypt"><code class="docutils literal"><span class="pre">psa_aead_decrypt</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#multi-part-aead-operations">Multi-part AEAD operations</a><ul>
+<li><a class="reference internal" href="#psa_aead_operation_t"><code class="docutils literal"><span class="pre">psa_aead_operation_t</span></code> (type)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#psa_aead_operation_init"><code class="docutils literal"><span class="pre">psa_aead_operation_init</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_encrypt_setup"><code class="docutils literal"><span class="pre">psa_aead_encrypt_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_decrypt_setup"><code class="docutils literal"><span class="pre">psa_aead_decrypt_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_generate_nonce"><code class="docutils literal"><span class="pre">psa_aead_generate_nonce</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_set_nonce"><code class="docutils literal"><span class="pre">psa_aead_set_nonce</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_set_lengths"><code class="docutils literal"><span class="pre">psa_aead_set_lengths</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_update_ad"><code class="docutils literal"><span class="pre">psa_aead_update_ad</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_update"><code class="docutils literal"><span class="pre">psa_aead_update</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_finish"><code class="docutils literal"><span class="pre">psa_aead_finish</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_verify"><code class="docutils literal"><span class="pre">psa_aead_verify</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_aead_abort"><code class="docutils literal"><span class="pre">psa_aead_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG"><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_NONCE_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_TAG_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_TAG_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="relations">
+<h3>Related Topics</h3>
+<ul>
+  <li><a href="../../index.html">Documentation overview</a><ul>
+  <li><a href="index.html">Cryptographic operation reference</a><ul>
+      <li>Previous: <a href="ciphers.html" title="previous chapter">Unauthenticated ciphers</a></li>
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+            
+  <div class="section" id="unauthenticated-ciphers">
+<span id="ciphers"></span><h1>Unauthenticated ciphers</h1>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p>The unauthenticated cipher API is provided to implement legacy protocols and
+for use cases where the data integrity and authenticity is guaranteed by
+non-cryptographic means.</p>
+<p class="last">It is recommended that newer protocols use <em><a class="reference internal" href="aead.html#aead"><span class="std std-ref">Authenticated encryption with associated data (AEAD)</span></a></em>.</p>
+</div>
+<div class="section" id="cipher-algorithms">
+<span id="id1"></span><h2>Cipher algorithms</h2>
+<div class="section" id="PSA_ALG_STREAM_CIPHER">
+<span id="c.PSA_ALG_STREAM_CIPHER"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_STREAM_CIPHER</span></code> (macro)</h3>
+<p>The stream cipher mode of a stream cipher algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_STREAM_CIPHER" title="PSA_ALG_STREAM_CIPHER">PSA_ALG_STREAM_CIPHER</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x04800100)
+</pre>
+<p>The underlying stream cipher is determined by the key type:</p>
+<ul class="simple">
+<li>To use ChaCha20, use a key type of <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_CHACHA20" title="PSA_KEY_TYPE_CHACHA20"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_CHACHA20</span></code></a> and algorithm id <a class="reference internal" href="#c.PSA_ALG_STREAM_CIPHER" title="PSA_ALG_STREAM_CIPHER"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_STREAM_CIPHER</span></code></a>.</li>
+<li>To use ARC4, use a key type of <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_ARC4" title="PSA_KEY_TYPE_ARC4"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_ARC4</span></code></a> and algorithm id <a class="reference internal" href="#c.PSA_ALG_STREAM_CIPHER" title="PSA_ALG_STREAM_CIPHER"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_STREAM_CIPHER</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="PSA_ALG_CTR">
+<span id="c.PSA_ALG_CTR"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CTR</span></code> (macro)</h3>
+<p>A stream cipher built using the Counter (CTR) mode of a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CTR" title="PSA_ALG_CTR">PSA_ALG_CTR</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x04c01000)
+</pre>
+<p>CTR is a stream cipher which is built from a block cipher. The underlying block cipher is determined by the key type. For example, to use AES-128-CTR, use this algorithm with a key of type <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_AES" title="PSA_KEY_TYPE_AES"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_AES</span></code></a> and a length of 128 bits (16 bytes).</p>
+</div>
+<div class="section" id="PSA_ALG_CFB">
+<span id="c.PSA_ALG_CFB"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CFB</span></code> (macro)</h3>
+<p>A stream cipher built using the Cipher Feedback (CFB) mode of a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CFB" title="PSA_ALG_CFB">PSA_ALG_CFB</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x04c01100)
+</pre>
+<p>The underlying block cipher is determined by the key type.</p>
+</div>
+<div class="section" id="PSA_ALG_OFB">
+<span id="c.PSA_ALG_OFB"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_OFB</span></code> (macro)</h3>
+<p>A stream cipher built using the Output Feedback (OFB) mode of a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_OFB" title="PSA_ALG_OFB">PSA_ALG_OFB</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x04c01200)
+</pre>
+<p>The underlying block cipher is determined by the key type.</p>
+</div>
+<div class="section" id="PSA_ALG_XTS">
+<span id="c.PSA_ALG_XTS"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_XTS</span></code> (macro)</h3>
+<p>The XTS cipher mode of a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_XTS" title="PSA_ALG_XTS">PSA_ALG_XTS</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x0440ff00)
+</pre>
+<p>XTS is a cipher mode which is built from a block cipher. It requires at least one full block of input, but beyond this minimum the input does not need to be a whole number of blocks.</p>
+</div>
+<div class="section" id="PSA_ALG_ECB_NO_PADDING">
+<span id="c.PSA_ALG_ECB_NO_PADDING"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_ECB_NO_PADDING</span></code> (macro)</h3>
+<p>The Electronic Code Book (ECB) mode of a block cipher, with no padding.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_ECB_NO_PADDING" title="PSA_ALG_ECB_NO_PADDING">PSA_ALG_ECB_NO_PADDING</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x04404400)
+</pre>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">ECB mode does not protect the confidentiality of the encrypted data except in extremely narrow circumstances. It is recommended that applications only use ECB if they need to construct an operating mode that the implementation does not provide. Implementations are encouraged to provide the modes that applications need in preference to supporting direct access to ECB.</p>
+</div>
+<p>The underlying block cipher is determined by the key type.</p>
+<p>This symmetric cipher mode can only be used with messages whose lengths are whole number of blocks for the chosen block cipher.</p>
+<p>ECB mode does not accept an initialization vector (IV). When using a multi-part cipher operation with this algorithm, <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_generate_iv()</span></code></a> and <a class="reference internal" href="#c.psa_cipher_set_iv" title="psa_cipher_set_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_set_iv()</span></code></a> must not be called.</p>
+</div>
+<div class="section" id="PSA_ALG_CBC_NO_PADDING">
+<span id="c.PSA_ALG_CBC_NO_PADDING"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CBC_NO_PADDING</span></code> (macro)</h3>
+<p>The Cipher Block Chaining (CBC) mode of a block cipher, with no padding.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CBC_NO_PADDING" title="PSA_ALG_CBC_NO_PADDING">PSA_ALG_CBC_NO_PADDING</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x04404000)
+</pre>
+<p>The underlying block cipher is determined by the key type.</p>
+<p>This symmetric cipher mode can only be used with messages whose lengths are whole number of blocks for the chosen block cipher.</p>
+</div>
+<div class="section" id="PSA_ALG_CBC_PKCS7">
+<span id="c.PSA_ALG_CBC_PKCS7"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CBC_PKCS7</span></code> (macro)</h3>
+<p>The Cipher Block Chaining (CBC) mode of a block cipher, with PKCS#7 padding.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CBC_PKCS7" title="PSA_ALG_CBC_PKCS7">PSA_ALG_CBC_PKCS7</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x04404100)
+</pre>
+<p>The underlying block cipher is determined by the key type.</p>
+<p>This is the padding method defined by PKCS#7 <a class="reference external" href="https://tools.ietf.org/html/rfc2315.html#section-10.3">RFC 2315 §10.3</a>.</p>
+</div>
+</div>
+<div class="section" id="single-part-cipher-functions">
+<h2>Single-part cipher functions</h2>
+<div class="section" id="psa_cipher_encrypt">
+<span id="c.psa_cipher_encrypt"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_encrypt</span></code> (function)</h3>
+<p>Encrypt a message using a symmetric cipher.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt">psa_cipher_encrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                                const uint8_t * input,
+                                size_t input_length,
+                                uint8_t * output,
+                                size_t output_size,
+                                size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The cipher algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message to encrypt.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the output is to be written. The output contains the IV followed by the ciphertext proper.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code>  where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum output size of any supported cipher encryption.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a cipher algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">output_size</span></code> is too small. <a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function encrypts a message with a random initialization vector (IV).
+The length of the IV is <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.
+The output of <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt()</span></code></a> is the IV followed by the ciphertext.</p>
+<p>Use the multi-part operation interface with a <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a> object to provide other forms of IV or to manage the IV and ciphertext independently.</p>
+</div>
+<div class="section" id="psa_cipher_decrypt">
+<span id="c.psa_cipher_decrypt"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_decrypt</span></code> (function)</h3>
+<p>Decrypt a message using a symmetric cipher.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_decrypt" title="psa_cipher_decrypt">psa_cipher_decrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                                const uint8_t * input,
+                                size_t input_length,
+                                uint8_t * output,
+                                size_t output_size,
+                                size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The cipher algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message to decrypt. This consists of the IV followed by the ciphertext proper.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the plaintext is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code>  where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum output size of any supported cipher decryption.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a cipher algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">output_size</span></code> is too small. <a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function decrypts a message encrypted with a symmetric cipher.</p>
+<p>The input to this function must contain the IV followed by the ciphertext, as output by <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt()</span></code></a>. The IV must be <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> bytes in length, where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</p>
+<p>Use the multi-part operation interface with a <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a> object to decrypt data which is not in the expected input format.</p>
+</div>
+</div>
+<div class="section" id="multi-part-cipher-operations">
+<h2>Multi-part cipher operations</h2>
+<div class="section" id="psa_cipher_operation_t">
+<span id="c.psa_cipher_operation_t"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_operation_t</span></code> (type)</h3>
+<p>The type of the state object for multi-part cipher operations.</p>
+<pre class="literal-block">
+typedef <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-type"><span class="std std-ref">/* implementation-defined type */</span></a></em> <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a>;
+</pre>
+<p>Before calling any function on a cipher operation object, the application must initialize it by any of the following means:</p>
+<ul>
+<li><p class="first">Set the object to all-bits-zero, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> operation;
+memset(&amp;operation, 0, sizeof(operation));
+</pre>
+</li>
+<li><p class="first">Initialize the object to logical zero values by declaring the object as static or global without an explicit initializer, for example:</p>
+<pre class="literal-block">
+static <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> operation;
+</pre>
+</li>
+<li><p class="first">Initialize the object to the initializer <a class="reference internal" href="#c.PSA_CIPHER_OPERATION_INIT" title="PSA_CIPHER_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_OPERATION_INIT</span></code></a>, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> operation = <a class="reference internal" href="#c.PSA_CIPHER_OPERATION_INIT" title="PSA_CIPHER_OPERATION_INIT">PSA_CIPHER_OPERATION_INIT</a>;
+</pre>
+</li>
+<li><p class="first">Assign the result of the function <a class="reference internal" href="#c.psa_cipher_operation_init" title="psa_cipher_operation_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_operation_init()</span></code></a> to the object, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> operation;
+operation = <a class="reference internal" href="#c.psa_cipher_operation_init" title="psa_cipher_operation_init">psa_cipher_operation_init</a>();
+</pre>
+</li>
+</ul>
+<p>This is an implementation-defined type. Applications that make assumptions about the content of this object will result in in implementation-specific behavior, and are non-portable.</p>
+</div>
+<div class="section" id="PSA_CIPHER_OPERATION_INIT">
+<span id="c.PSA_CIPHER_OPERATION_INIT"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_OPERATION_INIT</span></code> (macro)</h3>
+<p>This macro returns a suitable initializer for a cipher operation object of type <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_OPERATION_INIT" title="PSA_CIPHER_OPERATION_INIT">PSA_CIPHER_OPERATION_INIT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+</div>
+<div class="section" id="psa_cipher_operation_init">
+<span id="c.psa_cipher_operation_init"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_operation_init</span></code> (function)</h3>
+<p>Return an initial value for a cipher operation object.</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> <a class="reference internal" href="#c.psa_cipher_operation_init" title="psa_cipher_operation_init">psa_cipher_operation_init</a>(void);
+</pre>
+<p class="rubric">Returns: <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a></p>
+</div>
+<div class="section" id="psa_cipher_encrypt_setup">
+<span id="c.psa_cipher_encrypt_setup"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_encrypt_setup</span></code> (function)</h3>
+<p>Set the key for a multi-part symmetric encryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup">psa_cipher_encrypt_setup</a>(<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> * operation,
+                                      <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                      <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The cipher algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a cipher algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The sequence of operations to encrypt a message with a symmetric cipher is as follows:</p>
+<ol class="arabic simple">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_CIPHER_OPERATION_INIT" title="PSA_CIPHER_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_OPERATION_INIT</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a> to specify the algorithm and key.</li>
+<li>Call either <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_generate_iv()</span></code></a> or <a class="reference internal" href="#c.psa_cipher_set_iv" title="psa_cipher_set_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_set_iv()</span></code></a> to generate or set the initialization vector (IV), if the algorithm requires one. It is recommended to use <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_generate_iv()</span></code></a> unless the protocol being implemented requires a specific IV value.</li>
+<li>Call <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a> zero, one or more times, passing a fragment of the message each time.</li>
+<li>Call <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a>.</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a> at any time after the operation has been initialized.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_cipher_decrypt_setup">
+<span id="c.psa_cipher_decrypt_setup"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_decrypt_setup</span></code> (function)</h3>
+<p>Set the key for a multi-part symmetric decryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup">psa_cipher_decrypt_setup</a>(<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> * operation,
+                                      <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                      <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The cipher algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a cipher algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The sequence of operations to decrypt a message with a symmetric cipher is as follows:</p>
+<ol class="arabic simple">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_CIPHER_OPERATION_INIT" title="PSA_CIPHER_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_OPERATION_INIT</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt_setup()</span></code></a> to specify the algorithm and key.</li>
+<li>Call <a class="reference internal" href="#c.psa_cipher_set_iv" title="psa_cipher_set_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_set_iv()</span></code></a> with the initialization vector (IV) for the decryption, if the algorithm requires one. This must match the IV used for the encryption.</li>
+<li>Call <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a> zero, one or more times, passing a fragment of the message each time.</li>
+<li>Call <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a>.</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a> at any time after the operation has been initialized.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt_setup()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_cipher_generate_iv">
+<span id="c.psa_cipher_generate_iv"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_generate_iv</span></code> (function)</h3>
+<p>Generate an initialization vector (IV) for a symmetric encryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv">psa_cipher_generate_iv</a>(<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> * operation,
+                                    uint8_t * iv,
+                                    size_t iv_size,
+                                    size_t * iv_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active cipher operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">iv</span></code></dt>
+<dd>Buffer where the generated IV is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">iv_size</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">iv</span></code> buffer in bytes. This must be at least <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">alg</span></code> are type of key and the algorithm respectively that were used to set up the cipher operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">iv_length</span></code></dt>
+<dd>On success, the number of bytes of the generated IV.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd><p class="first">Either:</p>
+<ul class="last simple">
+<li>The cipher algorithm does not use an IV.</li>
+<li>The operation state is not valid: it must be active, with no IV set.</li>
+</ul>
+</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">iv</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH()</span></code></a> or <a class="reference internal" href="#c.PSA_CIPHER_IV_MAX_SIZE" title="PSA_CIPHER_IV_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_IV_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function generates a random IV, nonce or initial counter value for the encryption operation as appropriate for the chosen algorithm, key type and key size.</p>
+<p>The generated IV is always the default length for the key and algorithm: <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code>, where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation. To generate different lengths of IV, use <a class="reference internal" href="rng.html#c.psa_generate_random" title="psa_generate_random"><code class="xref any c c-func docutils literal"><span class="pre">psa_generate_random()</span></code></a> and <a class="reference internal" href="#c.psa_cipher_set_iv" title="psa_cipher_set_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_set_iv()</span></code></a>.</p>
+<p>If the cipher algorithm does not use an IV, calling this function returns a <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a> error. For these algorithms, <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> will be zero.</p>
+<p>The application must call <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a> before calling this function.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_cipher_set_iv">
+<span id="c.psa_cipher_set_iv"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_set_iv</span></code> (function)</h3>
+<p>Set the initialization vector (IV) for a symmetric encryption or decryption operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_set_iv" title="psa_cipher_set_iv">psa_cipher_set_iv</a>(<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> * operation,
+                               const uint8_t * iv,
+                               size_t iv_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active cipher operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">iv</span></code></dt>
+<dd>Buffer containing the IV to use.</dd>
+<dt> <code class="docutils literal"><span class="pre">iv_length</span></code></dt>
+<dd>Size of the IV in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd><p class="first">Either:</p>
+<ul class="last simple">
+<li>The cipher algorithm does not use an IV.</li>
+<li>The operation state is not valid: it must be an active cipher encrypt operation, with no IV set.</li>
+</ul>
+</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The size of <code class="docutils literal"><span class="pre">iv</span></code> is not acceptable for the chosen algorithm, or the chosen algorithm does not use an IV.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function sets the IV, nonce or initial counter value for the encryption or decryption operation.</p>
+<p>If the cipher algorithm does not use an IV, calling this function returns a <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a> error. For these algorithms, <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> will be zero.</p>
+<p>The application must call <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt_setup()</span></code></a> before calling this function.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">When encrypting, <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_generate_iv()</span></code></a> is recommended instead of using this function, unless implementing a protocol that requires a non-random IV.</p>
+</div>
+</div>
+<div class="section" id="psa_cipher_update">
+<span id="c.psa_cipher_update"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_update</span></code> (function)</h3>
+<p>Encrypt or decrypt a message fragment in an active cipher operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update">psa_cipher_update</a>(<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> * operation,
+                               const uint8_t * input,
+                               size_t input_length,
+                               uint8_t * output,
+                               size_t output_size,
+                               size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active cipher operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message fragment to encrypt or decrypt.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the output is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code>  where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
+<li><a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum output size of any supported cipher algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active, with an IV set if required for the algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The following must occur before calling this function:</p>
+<ol class="arabic simple">
+<li>Call either <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt_setup()</span></code></a>. The choice of setup function determines whether this function encrypts or decrypts its input.</li>
+<li>If the algorithm requires an IV, call <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_generate_iv()</span></code></a> or <a class="reference internal" href="#c.psa_cipher_set_iv" title="psa_cipher_set_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_set_iv()</span></code></a>. <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_generate_iv()</span></code></a> is recommended when encrypting.</li>
+</ol>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_cipher_finish">
+<span id="c.psa_cipher_finish"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_finish</span></code> (function)</h3>
+<p>Finish encrypting or decrypting a message in a cipher operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish">psa_cipher_finish</a>(<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> * operation,
+                               uint8_t * output,
+                               size_t output_size,
+                               size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active cipher operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the output is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code>  where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
+<li><a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported cipher algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The total input size passed to this operation is not valid for this particular algorithm. For example, the algorithm is a based on block cipher and requires a whole number of blocks, but the total input size is not a multiple of the block size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_PADDING" title="PSA_ERROR_INVALID_PADDING"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_PADDING</span></code></a></dt>
+<dd>This is a decryption operation for an algorithm that includes padding, and the ciphertext does not contain valid padding.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active, with an IV set if required for the algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt_setup()</span></code></a> before calling this function. The choice of setup function determines whether this function encrypts or decrypts its input.</p>
+<p>This function finishes the encryption or decryption of the message formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a>.</p>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_cipher_abort">
+<span id="c.psa_cipher_abort"></span><h3><code class="docutils literal"><span class="pre">psa_cipher_abort</span></code> (function)</h3>
+<p>Abort a cipher operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort">psa_cipher_abort</a>(<a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t">psa_cipher_operation_t</a> * operation);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Initialized cipher operation.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Aborting an operation frees all associated resources except for the <code class="docutils literal"><span class="pre">operation</span></code> object itself. Once aborted, the operation object can be reused for another operation by calling <a class="reference internal" href="#c.psa_cipher_encrypt_setup" title="psa_cipher_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_cipher_decrypt_setup" title="psa_cipher_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt_setup()</span></code></a> again.</p>
+<p>This function can be called any time after the operation object has been initialized as described in <a class="reference internal" href="#c.psa_cipher_operation_t" title="psa_cipher_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_cipher_operation_t</span></code></a>.</p>
+<p>In particular, calling <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a> after the operation has been terminated by a call to <a class="reference internal" href="#c.psa_cipher_abort" title="psa_cipher_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_abort()</span></code></a> or <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a> is safe and has no effect.</p>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_ALG_IS_STREAM_CIPHER">
+<span id="c.PSA_ALG_IS_STREAM_CIPHER"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_STREAM_CIPHER</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a stream cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_STREAM_CIPHER" title="PSA_ALG_IS_STREAM_CIPHER">PSA_ALG_IS_STREAM_CIPHER</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a stream cipher algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier or if it is not a symmetric cipher algorithm.</p>
+<p class="rubric">Description</p>
+<p>A stream cipher is a symmetric cipher that encrypts or decrypts messages by applying a bitwise-xor with a stream of bytes that is generated from a key.</p>
+</div>
+<div class="section" id="PSA_CIPHER_ENCRYPT_OUTPUT_SIZE">
+<span id="c.PSA_CIPHER_ENCRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>The maximum size of the output of <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_SIZE">PSA_CIPHER_ENCRYPT_OUTPUT_SIZE</a>(key_type, alg, input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A cipher algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient output size for the specified key type and algorithm. If the key type or cipher algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and cipher algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt()</span></code></a> will not fail due to an insufficient buffer size. Depending on the algorithm, the actual size of the output might be smaller.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE">
+<span id="c.PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt()</span></code></a>, for any of the supported key types and cipher algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE">PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE</a>(input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_ENCRYPT_OUTPUT_SIZE" title="PSA_CIPHER_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_DECRYPT_OUTPUT_SIZE">
+<span id="c.PSA_CIPHER_DECRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>The maximum size of the output of <a class="reference internal" href="#c.psa_cipher_decrypt" title="psa_cipher_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_SIZE">PSA_CIPHER_DECRYPT_OUTPUT_SIZE</a>(key_type, alg, input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A cipher algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient output size for the specified key type and algorithm. If the key type or cipher algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and cipher algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_cipher_decrypt" title="psa_cipher_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt()</span></code></a> will not fail due to an insufficient buffer size. Depending on the algorithm, the actual size of the output might be smaller.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE">
+<span id="c.PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_cipher_decrypt" title="psa_cipher_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt()</span></code></a>, for any of the supported key types and cipher algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE">PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE</a>(input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_cipher_decrypt" title="psa_cipher_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_decrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_DECRYPT_OUTPUT_SIZE" title="PSA_CIPHER_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_IV_LENGTH">
+<span id="c.PSA_CIPHER_IV_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code> (macro)</h3>
+<p>The default IV size for a cipher algorithm, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH">PSA_CIPHER_IV_LENGTH</a>(key_type, alg) <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A cipher algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The default IV size for the specified key type and algorithm.
+If the algorithm does not use an IV, return <code class="docutils literal"><span class="pre">0</span></code>.
+If the key type or cipher algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>.
+An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and cipher algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>The IV that is generated as part of a call to <a class="reference internal" href="#c.psa_cipher_encrypt" title="psa_cipher_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_encrypt()</span></code></a> is always the default IV length for the algorithm.</p>
+<p>This macro can be used to allocate a buffer of sufficient size to store the IV output from <a class="reference internal" href="#c.psa_cipher_generate_iv" title="psa_cipher_generate_iv"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_generate_iv()</span></code></a> when using a multi-part cipher operation.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_IV_MAX_SIZE" title="PSA_CIPHER_IV_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_IV_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_IV_MAX_SIZE">
+<span id="c.PSA_CIPHER_IV_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_MAX_SIZE</span></code> (macro)</h3>
+<p>The maximum IV size for all supported cipher algorithms, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_IV_MAX_SIZE" title="PSA_CIPHER_IV_MAX_SIZE">PSA_CIPHER_IV_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_IV_LENGTH" title="PSA_CIPHER_IV_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_UPDATE_OUTPUT_SIZE">
+<span id="c.PSA_CIPHER_UPDATE_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_SIZE">PSA_CIPHER_UPDATE_OUTPUT_SIZE</a>(key_type, alg, input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A cipher algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient output size for the specified key type and algorithm. If the key type or cipher algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and cipher algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a> will not fail due to an insufficient buffer size. The actual size of the output might be smaller in any given call.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE">
+<span id="c.PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a>, for any of the supported key types and cipher algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE">PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE</a>(input_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the input in bytes.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a> will not fail due to an insufficient buffer size.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_UPDATE_OUTPUT_SIZE" title="PSA_CIPHER_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_FINISH_OUTPUT_SIZE">
+<span id="c.PSA_CIPHER_FINISH_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>A sufficient ciphertext buffer size for <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_SIZE">PSA_CIPHER_FINISH_OUTPUT_SIZE</a>(key_type, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A cipher algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_CIPHER" title="PSA_ALG_IS_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_CIPHER</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient output size for the specified key type and algorithm. If the key type or cipher algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and cipher algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>If the size of the ciphertext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a> will not fail due to an insufficient ciphertext buffer size. The actual size of the output might be smaller in any given call.</p>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE">
+<span id="c.PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient ciphertext buffer size for <a class="reference internal" href="#c.psa_cipher_finish" title="psa_cipher_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_finish()</span></code></a>, for any of the supported key types and cipher algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE">PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_CIPHER_FINISH_OUTPUT_SIZE" title="PSA_CIPHER_FINISH_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_BLOCK_CIPHER_BLOCK_LENGTH">
+<span id="c.PSA_BLOCK_CIPHER_BLOCK_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_LENGTH</span></code> (macro)</h3>
+<p>The block size of a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_BLOCK_CIPHER_BLOCK_LENGTH" title="PSA_BLOCK_CIPHER_BLOCK_LENGTH">PSA_BLOCK_CIPHER_BLOCK_LENGTH</a>(type) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">type</span></code></dt>
+<dd>A cipher key type (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_key_type_t" title="psa_key_type_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_key_type_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The block size for a block cipher, or <code class="docutils literal"><span class="pre">1</span></code> for a stream cipher. The return value is undefined if <code class="docutils literal"><span class="pre">type</span></code> is not a supported cipher key type.</p>
+<p class="rubric">Description</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">It is possible to build stream cipher algorithms on top of a block cipher, for example CTR mode (<a class="reference internal" href="#c.PSA_ALG_CTR" title="PSA_ALG_CTR"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_CTR</span></code></a>). This macro only takes the key type into account, so it cannot be used to determine the size of the data that <a class="reference internal" href="#c.psa_cipher_update" title="psa_cipher_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_cipher_update()</span></code></a> might buffer for future processing in general.</p>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">This macro expression is a compile-time constant if <code class="docutils literal"><span class="pre">type</span></code> is a compile-time constant.</p>
+</div>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">This macro is permitted to evaluate its argument multiple times.</p>
+</div>
+<p>See also <a class="reference internal" href="#c.PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE" title="PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE">
+<span id="c.PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE</span></code> (macro)</h3>
+<p>The maximum size of a block cipher supported by the implementation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE" title="PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE">PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_BLOCK_CIPHER_BLOCK_LENGTH" title="PSA_BLOCK_CIPHER_BLOCK_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_LENGTH()</span></code></a>.</p>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Unauthenticated ciphers</a><ul>
+<li><a class="reference internal" href="#cipher-algorithms">Cipher algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_STREAM_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_STREAM_CIPHER</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_CTR"><code class="docutils literal"><span class="pre">PSA_ALG_CTR</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_CFB"><code class="docutils literal"><span class="pre">PSA_ALG_CFB</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_OFB"><code class="docutils literal"><span class="pre">PSA_ALG_OFB</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_XTS"><code class="docutils literal"><span class="pre">PSA_ALG_XTS</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_ECB_NO_PADDING"><code class="docutils literal"><span class="pre">PSA_ALG_ECB_NO_PADDING</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_CBC_NO_PADDING"><code class="docutils literal"><span class="pre">PSA_ALG_CBC_NO_PADDING</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_CBC_PKCS7"><code class="docutils literal"><span class="pre">PSA_ALG_CBC_PKCS7</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#single-part-cipher-functions">Single-part cipher functions</a><ul>
+<li><a class="reference internal" href="#psa_cipher_encrypt"><code class="docutils literal"><span class="pre">psa_cipher_encrypt</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_decrypt"><code class="docutils literal"><span class="pre">psa_cipher_decrypt</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#multi-part-cipher-operations">Multi-part cipher operations</a><ul>
+<li><a class="reference internal" href="#psa_cipher_operation_t"><code class="docutils literal"><span class="pre">psa_cipher_operation_t</span></code> (type)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_CIPHER_OPERATION_INIT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#psa_cipher_operation_init"><code class="docutils literal"><span class="pre">psa_cipher_operation_init</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_encrypt_setup"><code class="docutils literal"><span class="pre">psa_cipher_encrypt_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_decrypt_setup"><code class="docutils literal"><span class="pre">psa_cipher_decrypt_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_generate_iv"><code class="docutils literal"><span class="pre">psa_cipher_generate_iv</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_set_iv"><code class="docutils literal"><span class="pre">psa_cipher_set_iv</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_update"><code class="docutils literal"><span class="pre">psa_cipher_update</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_finish"><code class="docutils literal"><span class="pre">psa_cipher_finish</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_cipher_abort"><code class="docutils literal"><span class="pre">psa_cipher_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_IS_STREAM_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_STREAM_CIPHER</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_IV_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_BLOCK_CIPHER_BLOCK_LENGTH"><code class="docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="relations">
+<h3>Related Topics</h3>
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+  <div class="section" id="message-digests">
+<span id="hashes"></span><h1>Message digests</h1>
+<div class="section" id="hash-algorithms">
+<span id="id1"></span><h2>Hash algorithms</h2>
+<div class="section" id="PSA_ALG_MD2">
+<span id="c.PSA_ALG_MD2"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_MD2</span></code> (macro)</h3>
+<p>MD2.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_MD2" title="PSA_ALG_MD2">PSA_ALG_MD2</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000001)
+</pre>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">The MD2 hash is weak and deprecated and is only recommended for use in legacy protocols.</p>
+</div>
+</div>
+<div class="section" id="PSA_ALG_MD4">
+<span id="c.PSA_ALG_MD4"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_MD4</span></code> (macro)</h3>
+<p>MD4.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_MD4" title="PSA_ALG_MD4">PSA_ALG_MD4</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000002)
+</pre>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">The MD4 hash is weak and deprecated and is only recommended for use in legacy protocols.</p>
+</div>
+</div>
+<div class="section" id="PSA_ALG_MD5">
+<span id="c.PSA_ALG_MD5"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_MD5</span></code> (macro)</h3>
+<p>MD5.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_MD5" title="PSA_ALG_MD5">PSA_ALG_MD5</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000003)
+</pre>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">The MD5 hash is weak and deprecated and is only recommended for use in legacy protocols.</p>
+</div>
+</div>
+<div class="section" id="PSA_ALG_RIPEMD160">
+<span id="c.PSA_ALG_RIPEMD160"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RIPEMD160</span></code> (macro)</h3>
+<p>RIPEMD-160.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_RIPEMD160" title="PSA_ALG_RIPEMD160">PSA_ALG_RIPEMD160</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000004)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA_1">
+<span id="c.PSA_ALG_SHA_1"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA_1</span></code> (macro)</h3>
+<p>SHA-1.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA_1" title="PSA_ALG_SHA_1">PSA_ALG_SHA_1</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000005)
+</pre>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">The SHA-1 hash is weak and deprecated and is only recommended for use in legacy protocols.</p>
+</div>
+</div>
+<div class="section" id="PSA_ALG_SHA_224">
+<span id="c.PSA_ALG_SHA_224"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA_224</span></code> (macro)</h3>
+<p>SHA-224.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA_224" title="PSA_ALG_SHA_224">PSA_ALG_SHA_224</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000008)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA_256">
+<span id="c.PSA_ALG_SHA_256"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code> (macro)</h3>
+<p>SHA-256.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA_256" title="PSA_ALG_SHA_256">PSA_ALG_SHA_256</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000009)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA_384">
+<span id="c.PSA_ALG_SHA_384"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA_384</span></code> (macro)</h3>
+<p>SHA-384.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA_384" title="PSA_ALG_SHA_384">PSA_ALG_SHA_384</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x0200000a)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA_512">
+<span id="c.PSA_ALG_SHA_512"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512</span></code> (macro)</h3>
+<p>SHA-512.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA_512" title="PSA_ALG_SHA_512">PSA_ALG_SHA_512</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x0200000b)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA_512_224">
+<span id="c.PSA_ALG_SHA_512_224"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512_224</span></code> (macro)</h3>
+<p>SHA-512/224.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA_512_224" title="PSA_ALG_SHA_512_224">PSA_ALG_SHA_512_224</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x0200000c)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA_512_256">
+<span id="c.PSA_ALG_SHA_512_256"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512_256</span></code> (macro)</h3>
+<p>SHA-512/256.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA_512_256" title="PSA_ALG_SHA_512_256">PSA_ALG_SHA_512_256</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x0200000d)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA3_224">
+<span id="c.PSA_ALG_SHA3_224"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_224</span></code> (macro)</h3>
+<p>SHA3-224.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA3_224" title="PSA_ALG_SHA3_224">PSA_ALG_SHA3_224</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000010)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA3_256">
+<span id="c.PSA_ALG_SHA3_256"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_256</span></code> (macro)</h3>
+<p>SHA3-256.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA3_256" title="PSA_ALG_SHA3_256">PSA_ALG_SHA3_256</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000011)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA3_384">
+<span id="c.PSA_ALG_SHA3_384"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_384</span></code> (macro)</h3>
+<p>SHA3-384.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA3_384" title="PSA_ALG_SHA3_384">PSA_ALG_SHA3_384</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000012)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_SHA3_512">
+<span id="c.PSA_ALG_SHA3_512"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_512</span></code> (macro)</h3>
+<p>SHA3-512.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_SHA3_512" title="PSA_ALG_SHA3_512">PSA_ALG_SHA3_512</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x02000013)
+</pre>
+</div>
+</div>
+<div class="section" id="single-part-hashing-functions">
+<h2>Single-part hashing functions</h2>
+<div class="section" id="psa_hash_compute">
+<span id="c.psa_hash_compute"></span><h3><code class="docutils literal"><span class="pre">psa_hash_compute</span></code> (function)</h3>
+<p>Calculate the hash (digest) of a message.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_compute" title="psa_hash_compute">psa_hash_compute</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                              const uint8_t * input,
+                              size_t input_length,
+                              uint8_t * hash,
+                              size_t hash_size,
+                              size_t * hash_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The hash algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message to hash.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash</span></code></dt>
+<dd>Buffer where the hash is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_size</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">hash</span></code> buffer in bytes.
+This must be at least <a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_length</span></code></dt>
+<dd>On success, the number of bytes that make up the hash value. This is always <a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code>.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a hash algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">hash_size</span></code> is too small.
+<a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_LENGTH()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">To verify the hash of a message against an expected value, use <a class="reference internal" href="#c.psa_hash_compare" title="psa_hash_compare"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_compare()</span></code></a> instead.</p>
+</div>
+</div>
+<div class="section" id="psa_hash_compare">
+<span id="c.psa_hash_compare"></span><h3><code class="docutils literal"><span class="pre">psa_hash_compare</span></code> (function)</h3>
+<p>Calculate the hash (digest) of a message and compare it with a reference value.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_compare" title="psa_hash_compare">psa_hash_compare</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                              const uint8_t * input,
+                              size_t input_length,
+                              const uint8_t * hash,
+                              size_t hash_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The hash algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message to hash.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash</span></code></dt>
+<dd>Buffer containing the expected hash value.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">hash</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>The expected hash is identical to the actual hash of the input.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The hash of the message was calculated successfully, but it differs from the expected hash.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a hash algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">input_length</span></code> or <code class="docutils literal"><span class="pre">hash_length</span></code> do not match the hash size for <code class="docutils literal"><span class="pre">alg</span></code></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+</div>
+</div>
+<div class="section" id="multi-part-hashing-operations">
+<span id="hash-mp"></span><h2>Multi-part hashing operations</h2>
+<div class="section" id="psa_hash_operation_t">
+<span id="c.psa_hash_operation_t"></span><h3><code class="docutils literal"><span class="pre">psa_hash_operation_t</span></code> (type)</h3>
+<p>The type of the state object for multi-part hash operations.</p>
+<pre class="literal-block">
+typedef <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-type"><span class="std std-ref">/* implementation-defined type */</span></a></em> <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a>;
+</pre>
+<p>Before calling any function on a hash operation object, the application must initialize it by any of the following means:</p>
+<ul>
+<li><p class="first">Set the object to all-bits-zero, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> operation;
+memset(&amp;operation, 0, sizeof(operation));
+</pre>
+</li>
+<li><p class="first">Initialize the object to logical zero values by declaring the object as static or global without an explicit initializer, for example:</p>
+<pre class="literal-block">
+static <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> operation;
+</pre>
+</li>
+<li><p class="first">Initialize the object to the initializer <a class="reference internal" href="#c.PSA_HASH_OPERATION_INIT" title="PSA_HASH_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_OPERATION_INIT</span></code></a>, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> operation = <a class="reference internal" href="#c.PSA_HASH_OPERATION_INIT" title="PSA_HASH_OPERATION_INIT">PSA_HASH_OPERATION_INIT</a>;
+</pre>
+</li>
+<li><p class="first">Assign the result of the function <a class="reference internal" href="#c.psa_hash_operation_init" title="psa_hash_operation_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_operation_init()</span></code></a> to the object, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> operation;
+operation = <a class="reference internal" href="#c.psa_hash_operation_init" title="psa_hash_operation_init">psa_hash_operation_init</a>();
+</pre>
+</li>
+</ul>
+<p>This is an implementation-defined type. Applications that make assumptions about the content of this object will result in in implementation-specific behavior, and are non-portable.</p>
+</div>
+<div class="section" id="PSA_HASH_OPERATION_INIT">
+<span id="c.PSA_HASH_OPERATION_INIT"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_OPERATION_INIT</span></code> (macro)</h3>
+<p>This macro returns a suitable initializer for a hash operation object of type <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_hash_operation_t</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_OPERATION_INIT" title="PSA_HASH_OPERATION_INIT">PSA_HASH_OPERATION_INIT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+</div>
+<div class="section" id="psa_hash_operation_init">
+<span id="c.psa_hash_operation_init"></span><h3><code class="docutils literal"><span class="pre">psa_hash_operation_init</span></code> (function)</h3>
+<p>Return an initial value for a hash operation object.</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> <a class="reference internal" href="#c.psa_hash_operation_init" title="psa_hash_operation_init">psa_hash_operation_init</a>(void);
+</pre>
+<p class="rubric">Returns: <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="docutils literal"><span class="pre">psa_hash_operation_t</span></code></a></p>
+</div>
+<div class="section" id="psa_hash_setup">
+<span id="c.psa_hash_setup"></span><h3><code class="docutils literal"><span class="pre">psa_hash_setup</span></code> (function)</h3>
+<p>Set up a multi-part hash operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup">psa_hash_setup</a>(<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * operation,
+                            <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_hash_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The hash algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not a supported hash algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not a hash algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The sequence of operations to calculate a hash (message digest) is as follows:</p>
+<ol class="arabic simple">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_hash_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_HASH_OPERATION_INIT" title="PSA_HASH_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_OPERATION_INIT</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> to specify the algorithm.</li>
+<li>Call <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_update()</span></code></a> zero, one or more times, passing a fragment of the message each time. The hash that is calculated is the hash of the concatenation of these messages in order.</li>
+<li>To calculate the hash, call <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_finish()</span></code></a>. To compare the hash with an expected value, call <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a>. To suspend the hash operation and extract the current state, call <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a> at any time after the operation has been initialized.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_finish()</span></code></a> or <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a> or <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_hash_update">
+<span id="c.psa_hash_update"></span><h3><code class="docutils literal"><span class="pre">psa_hash_update</span></code> (function)</h3>
+<p>Add a message fragment to a multi-part hash operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update">psa_hash_update</a>(<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * operation,
+                             const uint8_t * input,
+                             size_t input_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active hash operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message fragment to hash.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> or <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a> before calling this function.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_hash_finish">
+<span id="c.psa_hash_finish"></span><h3><code class="docutils literal"><span class="pre">psa_hash_finish</span></code> (function)</h3>
+<p>Finish the calculation of the hash of a message.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish">psa_hash_finish</a>(<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * operation,
+                             uint8_t * hash,
+                             size_t hash_size,
+                             size_t * hash_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active hash operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash</span></code></dt>
+<dd>Buffer where the hash is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_size</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">hash</span></code> buffer in bytes. This must be at least <a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that the operation performs.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_length</span></code></dt>
+<dd>On success, the number of bytes that make up the hash value. This is always <a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">alg</span></code> is the hash algorithm that the operation performs.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">hash</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_LENGTH()</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> or <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a> before calling this function. This function calculates the hash of the message formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_update()</span></code></a>.</p>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>.</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p>It is not recommended to use this function when a specific value is expected for the hash. Call <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a> instead with the expected hash value.</p>
+<p class="last">Comparing integrity or authenticity data such as hash values with a function such as <code class="docutils literal"><span class="pre">memcmp()</span></code> is risky because the time taken by the comparison might leak information about the hashed data which could allow an attacker to guess a valid hash and thereby bypass security controls.</p>
+</div>
+</div>
+<div class="section" id="psa_hash_verify">
+<span id="c.psa_hash_verify"></span><h3><code class="docutils literal"><span class="pre">psa_hash_verify</span></code> (function)</h3>
+<p>Finish the calculation of the hash of a message and compare it with an expected value.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify">psa_hash_verify</a>(<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * operation,
+                             const uint8_t * hash,
+                             size_t hash_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active hash operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash</span></code></dt>
+<dd>Buffer containing the expected hash value.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">hash</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>The expected hash is identical to the actual hash of the message.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The hash of the message was calculated successfully, but it differs from the expected hash.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> before calling this function. This function calculates the hash of the message formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_update()</span></code></a>. It then compares the calculated hash with the expected hash passed as a parameter to this function.</p>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Implementations must make the best effort to ensure that the comparison between the actual hash and the expected hash is performed in constant time.</p>
+</div>
+</div>
+<div class="section" id="psa_hash_abort">
+<span id="c.psa_hash_abort"></span><h3><code class="docutils literal"><span class="pre">psa_hash_abort</span></code> (function)</h3>
+<p>Abort a hash operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort">psa_hash_abort</a>(<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * operation);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Initialized hash operation.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Aborting an operation frees all associated resources except for the <code class="docutils literal"><span class="pre">operation</span></code> object itself. Once aborted, the operation object can be reused for another operation by calling <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> again.</p>
+<p>This function can be called any time after the operation object has been initialized by one of the methods described in <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_hash_operation_t</span></code></a>.</p>
+<p>In particular, calling <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a> after the operation has been terminated by a call to <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>, <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_finish()</span></code></a> or <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a> is safe and has no effect.</p>
+</div>
+<div class="section" id="psa_hash_suspend">
+<span id="c.psa_hash_suspend"></span><h3><code class="docutils literal"><span class="pre">psa_hash_suspend</span></code> (function)</h3>
+<p>Halt the hash operation and extract the intermediate state of the hash computation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend">psa_hash_suspend</a>(<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * operation,
+                              uint8_t * hash_state,
+                              size_t hash_state_size,
+                              size_t * hash_state_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active hash operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_state</span></code></dt>
+<dd>Buffer where the hash suspend state is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_state_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">hash_state</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm:</p>
+<ul class="last simple">
+<li>A sufficient output size is <a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code>  where <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that was used to set up the operation.</li>
+<li><a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported hash algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_state_length</span></code></dt>
+<dd>On success, the number of bytes that make up the hash suspend state.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">hash_state</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd>The hash algorithm being computed does not support suspend and resume.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> or <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a> before calling this function. This function extracts an intermediate state of the hash computation of the message formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_update()</span></code></a>.</p>
+<p>This function can be used to halt a hash operation, and then resume the hash operation at a later time, or in another application, by transferring the extracted hash suspend state to a call to <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a>.</p>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>.</p>
+<p>Hash suspend and resume is not defined for the SHA3 family of hash algorithms. <em><a class="reference internal" href="#hash-suspend-state"><span class="std std-ref">Hash suspend state</span></a></em> defines the format of the output from <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">Applications must not use any of the hash suspend state as if it was a hash output. Instead, the suspend state must only be used to resume a hash operation, and <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_finish()</span></code></a> or <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a> can then calculate or verify the final hash value.</p>
+</div>
+<p class="rubric">Usage</p>
+<p>The sequence of operations to suspend and resume a hash operation is as follows:</p>
+<ol class="arabic">
+<li><p class="first">Compute the first part of the hash.</p>
+<blockquote>
+<div><ol class="arabic simple">
+<li>Allocate an operation object and initialize it as described in the documentation for <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_hash_operation_t</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> to specify the algorithm.</li>
+<li>Call <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_update()</span></code></a> zero, one or more times, passing a fragment of the message each time.</li>
+<li>Call <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a> to extract the hash suspend state into a buffer.</li>
+</ol>
+</div></blockquote>
+</li>
+<li><p class="first">Pass the hash state buffer to the application which will resume the operation.</p>
+</li>
+<li><p class="first">Compute the rest of the hash.</p>
+<blockquote>
+<div><ol class="arabic simple">
+<li>Allocate an operation object and initialize it as described in the documentation for <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_hash_operation_t</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a> with the extracted hash state.</li>
+<li>Call <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_update()</span></code></a> zero, one or more times, passing a fragment of the message each time.</li>
+<li>To calculate the hash, call <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_finish()</span></code></a>. To compare the hash with an expected value, call <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a>.</li>
+</ol>
+</div></blockquote>
+</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> or <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a> at any time after the operation has been initialized.</p>
+</div>
+<div class="section" id="psa_hash_resume">
+<span id="c.psa_hash_resume"></span><h3><code class="docutils literal"><span class="pre">psa_hash_resume</span></code> (function)</h3>
+<p>Set up a multi-part hash operation using the hash suspend state from a previously suspended hash operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume">psa_hash_resume</a>(<a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * operation,
+                             const uint8_t * hash_state,
+                             size_t hash_state_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_hash_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_state</span></code></dt>
+<dd>A buffer containing the suspended hash state which is to be resumed. This must be in the format output by <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>, which is described in <em><a class="reference internal" href="#hash-suspend-state-format"><span class="std std-ref">Hash suspend state format</span></a></em>.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_state_length</span></code></dt>
+<dd>Length of <code class="docutils literal"><span class="pre">hash_state</span></code> in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd>The provided hash suspend state is for an algorithm that is not supported.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">hash_state</span></code> does not correspond to a valid hash suspend state. See <em><a class="reference internal" href="#hash-suspend-state-format"><span class="std std-ref">Hash suspend state format</span></a></em> for the definition.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>See <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a> for an example of how to use this function to suspend and resume a hash operation.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_finish()</span></code></a>, <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a> or <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_hash_abort" title="psa_hash_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_hash_clone">
+<span id="c.psa_hash_clone"></span><h3><code class="docutils literal"><span class="pre">psa_hash_clone</span></code> (function)</h3>
+<p>Clone a hash operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_hash_clone" title="psa_hash_clone">psa_hash_clone</a>(const <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * source_operation,
+                            <a class="reference internal" href="#c.psa_hash_operation_t" title="psa_hash_operation_t">psa_hash_operation_t</a> * target_operation);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">source_operation</span></code></dt>
+<dd>The active hash operation to clone.</dd>
+<dt> <code class="docutils literal"><span class="pre">target_operation</span></code></dt>
+<dd>The operation object to set up. It must be initialized but not active.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The <code class="docutils literal"><span class="pre">source_operation</span></code> state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The <code class="docutils literal"><span class="pre">target_operation</span></code> state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function copies the state of an ongoing hash operation to a new operation object. In other words, this function is equivalent to calling <a class="reference internal" href="#c.psa_hash_setup" title="psa_hash_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_setup()</span></code></a> on <code class="docutils literal"><span class="pre">target_operation</span></code> with the same algorithm that <code class="docutils literal"><span class="pre">source_operation</span></code> was set up for, then <a class="reference internal" href="#c.psa_hash_update" title="psa_hash_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_update()</span></code></a> on <code class="docutils literal"><span class="pre">target_operation</span></code> with the same input that that was passed to <code class="docutils literal"><span class="pre">source_operation</span></code>. After this function returns, the two objects are independent, i.e. subsequent calls involving one of the objects do not affect the other object.</p>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_HASH_LENGTH">
+<span id="c.PSA_HASH_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_LENGTH</span></code> (macro)</h3>
+<p>The size of the output of <a class="reference internal" href="#c.psa_hash_compute" title="psa_hash_compute"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_compute()</span></code></a> and <a class="reference internal" href="#c.psa_hash_finish" title="psa_hash_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_finish()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH">PSA_HASH_LENGTH</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true), or an HMAC algorithm (<a class="reference internal" href="macs.html#c.PSA_ALG_HMAC" title="PSA_ALG_HMAC"><code class="docutils literal"><span class="pre">PSA_ALG_HMAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">hash_alg</span></code> is a hash algorithm).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The hash length for the specified hash algorithm. If the hash algorithm is not recognized, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or the correct size for a hash algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>This is also the hash length that <a class="reference internal" href="#c.psa_hash_compare" title="psa_hash_compare"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_compare()</span></code></a> and <a class="reference internal" href="#c.psa_hash_verify" title="psa_hash_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_verify()</span></code></a> expect.</p>
+<p>See also <a class="reference internal" href="#c.PSA_HASH_MAX_SIZE" title="PSA_HASH_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_HASH_MAX_SIZE">
+<span id="c.PSA_HASH_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_MAX_SIZE</span></code> (macro)</h3>
+<p>Maximum size of a hash.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_MAX_SIZE" title="PSA_HASH_MAX_SIZE">PSA_HASH_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This macro must expand to a compile-time constant integer.
+It is recommended that this value is the maximum size of a hash supported by the implementation, in bytes. The value must not be smaller than this maximum.</p>
+<p>See also <a class="reference internal" href="#c.PSA_HASH_LENGTH" title="PSA_HASH_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_LENGTH()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_HASH_SUSPEND_OUTPUT_SIZE">
+<span id="c.PSA_HASH_SUSPEND_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>A sufficient hash suspend state buffer size for <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_SIZE">PSA_HASH_SUSPEND_OUTPUT_SIZE</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>A sufficient output size for the algorithm. If the hash algorithm is not recognized, or is not supported by <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a hash algorithm that it recognizes, but does not support.</p>
+<p>For a supported hash algorithm <code class="docutils literal"><span class="pre">alg</span></code>, the following expression is true:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_SIZE">PSA_HASH_SUSPEND_OUTPUT_SIZE</a>(alg) == <a class="reference internal" href="#c.PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH" title="PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH">PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH</a> +
+                                     <a class="reference internal" href="#c.PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH" title="PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH">PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH</a>(alg) +
+                                     <a class="reference internal" href="#c.PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH" title="PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH">PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH</a>(alg) +
+                                     <a class="reference internal" href="#c.PSA_HASH_BLOCK_LENGTH" title="PSA_HASH_BLOCK_LENGTH">PSA_HASH_BLOCK_LENGTH</a>(alg) - 1
+</pre>
+<p class="rubric">Description</p>
+<p>If the size of the hash state buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a> will not fail due to an insufficient buffer size. The actual size of the output might be smaller in any given call.</p>
+<p>See also <a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE">
+<span id="c.PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient hash suspend state buffer size for <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>, for any supported hash algorithms.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE">PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH">
+<span id="c.PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH</span></code> (macro)</h3>
+<p>The size of the <em>algorithm</em> field that is part of the output of <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH" title="PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH">PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH</a> ((size_t)4)
+</pre>
+<p>Applications can use this value to unpack the hash suspend state that is output by <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH">
+<span id="c.PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH</span></code> (macro)</h3>
+<p>The size of the <em>input-length</em> field that is part of the output of <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH" title="PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH">PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH</a>(alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The size, in bytes, of the <em>input-length</em> field of the hash suspend state for the specified hash algorithm. If the hash algorithm is not recognized, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or the correct size for a hash algorithm that it recognizes, but does not support.</p>
+<p>The algorithm-specific values are defined in <em><a class="reference internal" href="#hash-suspend-state-constants"><span class="std std-ref">Hash suspend state field sizes</span></a></em>.</p>
+<p class="rubric">Description</p>
+<p>Applications can use this value to unpack the hash suspend state that is output by <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH">
+<span id="c.PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH</span></code> (macro)</h3>
+<p>The size of the <em>hash-state</em> field that is part of the output of <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH" title="PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH">PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH</a>(alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The size, in bytes, of the <em>hash-state</em> field of the hash suspend state for the specified hash algorithm. If the hash algorithm is not recognized, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or the correct size for a hash algorithm that it recognizes, but does not support.</p>
+<p>The algorithm-specific values are defined in <em><a class="reference internal" href="#hash-suspend-state-constants"><span class="std std-ref">Hash suspend state field sizes</span></a></em>.</p>
+<p class="rubric">Description</p>
+<p>Applications can use this value to unpack the hash suspend state that is output by <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_HASH_BLOCK_LENGTH">
+<span id="c.PSA_HASH_BLOCK_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_HASH_BLOCK_LENGTH</span></code> (macro)</h3>
+<p>The input block size of a hash algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_HASH_BLOCK_LENGTH" title="PSA_HASH_BLOCK_LENGTH">PSA_HASH_BLOCK_LENGTH</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The block size for the specified hash algorithm. If the hash algorithm is not recognized, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or the correct size for a hash algorithm that it recognizes, but does not support.</p>
+<p class="rubric">Description</p>
+<p>Hash algorithms process their input data in blocks. Hash operations will retain any partial blocks until they have enough input to fill the block or until the operation is finished.</p>
+<p>This affects the output from <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>.</p>
+</div>
+</div>
+<div class="section" id="hash-suspend-state">
+<span id="id2"></span><h2>Hash suspend state</h2>
+<p>The hash suspend state is output by <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a> and input to <a class="reference internal" href="#c.psa_hash_resume" title="psa_hash_resume"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_resume()</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Hash suspend and resume is not defined for the SHA3 family of hash algorithms.</p>
+</div>
+<p class="rubric" id="hash-suspend-state-format">Hash suspend state format</p>
+<p>The hash suspend state has the following format:</p>
+<p><em>hash-suspend-state</em> = <em>algorithm</em> || <em>input-length</em> || <em>hash-state</em> || <em>unprocessed-input</em></p>
+<p>The fields in the hash suspend state are defined as follows:</p>
+<table border="1" class="colwidths-given docutils">
+<colgroup>
+<col width="25%" />
+<col width="75%" />
+</colgroup>
+<tbody valign="top">
+<tr class="row-odd"><td><p class="first"><em>algorithm</em></p>
+<p class="last">big-endian 32-bit unsigned integer</p>
+</td>
+<td><p class="first">The PSA Crypto API algorithm identifier. Encoded as a big-endian 32-bit unsigned integer.</p>
+<p class="last">The byte length of the <em>algorithm</em> field can be evaluated using <a class="reference internal" href="#c.PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH" title="PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH</span></code></a>.</p>
+</td>
+</tr>
+<tr class="row-even"><td><p class="first"><em>input-length</em></p>
+<p class="last">big-endian unsigned integer</p>
+</td>
+<td><p class="first">The content of this field is algorithm-specific:</p>
+<ul class="simple">
+<li>For MD2, this is the number of bytes in the <em>unprocessed-input</em>.</li>
+<li>For all other hash algorithms, this is the total number of bytes of input to the hash computation. This includes the <em>unprocessed-input</em> bytes.</li>
+</ul>
+<p>The size of this field is algorithm-specific:</p>
+<ul class="simple">
+<li>For MD2: <em>input-length</em> is an 8-bit unsigned integer.</li>
+<li>For MD4, MD5, RIPEMD-160, SHA-1, SHA-224 and SHA-256: <em>input-length</em> is a 64-bit unsigned integer.</li>
+<li>For SHA-512, SHA-384 and SHA-512/256: <em>input-length</em> is a 128-bit unsigned integer.</li>
+</ul>
+<p class="last">The length, in bytes, of the <em>input-length</em> field can be calculated using <a class="reference internal" href="#c.PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH" title="PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">alg</span></code> is a hash algorithm.
+See <em><a class="reference internal" href="#hash-suspend-state-constants"><span class="std std-ref">Hash suspend state field sizes</span></a></em>.</p>
+</td>
+</tr>
+<tr class="row-odd"><td><p class="first"><em>hash-state</em></p>
+<p class="last">array of bytes</p>
+</td>
+<td><p class="first">Algorithm-specific intermediate hash state:</p>
+<ul class="simple">
+<li>For MD2: 16 bytes of internal checksum, then 48 bytes of intermediate digest.</li>
+<li>For MD4 and MD5: 4x 32-bit integers, in little-endian encoding.</li>
+<li>For RIPEMD-160: 5x 32-bit integers, in little-endian encoding.</li>
+<li>For SHA-1: 5x 32-bit integers, in big-endian encoding.</li>
+<li>For SHA-224 and SHA-256: 8x 32-bit integers, in big-endian encoding.</li>
+<li>For SHA-512, SHA-384 and SHA-512/256: 8x 64-bit integers, in big-endian encoding.</li>
+</ul>
+<p class="last">The length of this field is specific to the algorithm.
+The length, in bytes, of the <em>hash-state</em> field can be calculated using <a class="reference internal" href="#c.PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH" title="PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">alg</span></code> is a hash algorithm.
+See <em><a class="reference internal" href="#hash-suspend-state-constants"><span class="std std-ref">Hash suspend state field sizes</span></a></em>.</p>
+</td>
+</tr>
+<tr class="row-even"><td><p class="first"><em>unprocessed-input</em></p>
+<p class="last">0 to (<em>hash-block-size</em>-1) bytes</p>
+</td>
+<td><p class="first">A partial block of unprocessed input data. This is between zero and <em>hash-block-size</em>-1 bytes of data, the length can be calculated by:</p>
+<p><code class="docutils literal"><span class="pre">length(</span></code><em>unprocessed-input</em><code class="docutils literal"><span class="pre">)</span></code> <code class="docutils literal"><span class="pre">=</span></code> <em>input-length</em> <code class="docutils literal"><span class="pre">%</span></code> <em>hash-block-size</em>.</p>
+<p class="last">The <em>hash-block-size</em> is specific to the algorithm.
+The size of a hash block can be calculated using <a class="reference internal" href="#c.PSA_HASH_BLOCK_LENGTH" title="PSA_HASH_BLOCK_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_BLOCK_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">alg</span></code> is a hash algorithm.
+See <em><a class="reference internal" href="#hash-suspend-state-constants"><span class="std std-ref">Hash suspend state field sizes</span></a></em>.</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p class="rubric" id="hash-suspend-state-constants">Hash suspend state field sizes</p>
+<p>The following table defines the algorithm-specific field lengths for the hash suspend state returned by <a class="reference internal" href="#c.psa_hash_suspend" title="psa_hash_suspend"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_suspend()</span></code></a>. All of the field lengths are in bytes. To compute the field lengths for algorithm <code class="docutils literal"><span class="pre">alg</span></code>, use the following expressions:</p>
+<ul class="simple">
+<li><a class="reference internal" href="#c.PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH" title="PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH</span></code></a> returns the length of the <em>algorithm</em> field.</li>
+<li><a class="reference internal" href="#c.PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH" title="PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> returns the length of the <em>input-length</em> field.</li>
+<li><a class="reference internal" href="#c.PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH" title="PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> returns the length of the <em>hash-state</em> field.</li>
+<li><a class="reference internal" href="#c.PSA_HASH_BLOCK_LENGTH" title="PSA_HASH_BLOCK_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_BLOCK_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)-1</span></code> is the maximum length of the <em>unprocessed-bytes</em> field.</li>
+<li><a class="reference internal" href="#c.PSA_HASH_SUSPEND_OUTPUT_SIZE" title="PSA_HASH_SUSPEND_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">slg</span></code><code class="docutils literal"><span class="pre">)</span></code> returns the maximum size of the hash suspend state.</li>
+</ul>
+<table border="1" class="docutils">
+<colgroup>
+<col width="25%" />
+<col width="25%" />
+<col width="25%" />
+<col width="25%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">Hash algorithm</th>
+<th class="head"><em>input-length</em> size (bytes)</th>
+<th class="head"><em>hash-state</em> length (bytes)</th>
+<th class="head"><em>unprocessed-bytes</em> length (bytes)</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td><a class="reference internal" href="#c.PSA_ALG_MD2" title="PSA_ALG_MD2"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_MD2</span></code></a></td>
+<td>1</td>
+<td>64</td>
+<td>0 - 15</td>
+</tr>
+<tr class="row-odd"><td><a class="reference internal" href="#c.PSA_ALG_MD4" title="PSA_ALG_MD4"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_MD4</span></code></a></td>
+<td>8</td>
+<td>16</td>
+<td>0 - 63</td>
+</tr>
+<tr class="row-even"><td><a class="reference internal" href="#c.PSA_ALG_MD5" title="PSA_ALG_MD5"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_MD5</span></code></a></td>
+<td>8</td>
+<td>16</td>
+<td>0 - 63</td>
+</tr>
+<tr class="row-odd"><td><a class="reference internal" href="#c.PSA_ALG_RIPEMD160" title="PSA_ALG_RIPEMD160"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RIPEMD160</span></code></a></td>
+<td>8</td>
+<td>20</td>
+<td>0 - 63</td>
+</tr>
+<tr class="row-even"><td><a class="reference internal" href="#c.PSA_ALG_SHA_1" title="PSA_ALG_SHA_1"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_SHA_1</span></code></a></td>
+<td>8</td>
+<td>20</td>
+<td>0 - 63</td>
+</tr>
+<tr class="row-odd"><td><a class="reference internal" href="#c.PSA_ALG_SHA_224" title="PSA_ALG_SHA_224"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_SHA_224</span></code></a></td>
+<td>8</td>
+<td>32</td>
+<td>0 - 63</td>
+</tr>
+<tr class="row-even"><td><a class="reference internal" href="#c.PSA_ALG_SHA_256" title="PSA_ALG_SHA_256"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code></a></td>
+<td>8</td>
+<td>32</td>
+<td>0 - 63</td>
+</tr>
+<tr class="row-odd"><td><a class="reference internal" href="#c.PSA_ALG_SHA_512_256" title="PSA_ALG_SHA_512_256"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_SHA_512_256</span></code></a></td>
+<td>16</td>
+<td>64</td>
+<td>0 - 127</td>
+</tr>
+<tr class="row-even"><td><a class="reference internal" href="#c.PSA_ALG_SHA_384" title="PSA_ALG_SHA_384"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_SHA_384</span></code></a></td>
+<td>16</td>
+<td>64</td>
+<td>0 - 127</td>
+</tr>
+<tr class="row-odd"><td><a class="reference internal" href="#c.PSA_ALG_SHA_512" title="PSA_ALG_SHA_512"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_SHA_512</span></code></a></td>
+<td>16</td>
+<td>64</td>
+<td>0 - 127</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Message digests</a><ul>
+<li><a class="reference internal" href="#hash-algorithms">Hash algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_MD2"><code class="docutils literal"><span class="pre">PSA_ALG_MD2</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_MD4"><code class="docutils literal"><span class="pre">PSA_ALG_MD4</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_MD5"><code class="docutils literal"><span class="pre">PSA_ALG_MD5</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_RIPEMD160"><code class="docutils literal"><span class="pre">PSA_ALG_RIPEMD160</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA_1"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_1</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA_224"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_224</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA_384"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_384</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA_512"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA_512_224"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512_224</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA_512_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512_256</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA3_224"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_224</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA3_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_256</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA3_384"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_384</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_SHA3_512"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_512</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#single-part-hashing-functions">Single-part hashing functions</a><ul>
+<li><a class="reference internal" href="#psa_hash_compute"><code class="docutils literal"><span class="pre">psa_hash_compute</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_compare"><code class="docutils literal"><span class="pre">psa_hash_compare</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#multi-part-hashing-operations">Multi-part hashing operations</a><ul>
+<li><a class="reference internal" href="#psa_hash_operation_t"><code class="docutils literal"><span class="pre">psa_hash_operation_t</span></code> (type)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_HASH_OPERATION_INIT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#psa_hash_operation_init"><code class="docutils literal"><span class="pre">psa_hash_operation_init</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_setup"><code class="docutils literal"><span class="pre">psa_hash_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_update"><code class="docutils literal"><span class="pre">psa_hash_update</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_finish"><code class="docutils literal"><span class="pre">psa_hash_finish</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_verify"><code class="docutils literal"><span class="pre">psa_hash_verify</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_abort"><code class="docutils literal"><span class="pre">psa_hash_abort</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_suspend"><code class="docutils literal"><span class="pre">psa_hash_suspend</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_resume"><code class="docutils literal"><span class="pre">psa_hash_resume</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_hash_clone"><code class="docutils literal"><span class="pre">psa_hash_clone</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_HASH_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_SUSPEND_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_HASH_BLOCK_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_BLOCK_LENGTH</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#hash-suspend-state">Hash suspend state</a></li>
+</ul>
+</li>
+</ul>
+<div class="relations">
+<h3>Related Topics</h3>
+<ul>
+  <li><a href="../../index.html">Documentation overview</a><ul>
+  <li><a href="index.html">Cryptographic operation reference</a><ul>
+      <li>Previous: <a href="index.html" title="previous chapter">Cryptographic operation reference</a></li>
+      <li>Next: <a href="macs.html" title="next chapter">Message authentication codes (MAC)</a></li>
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+  <div class="section" id="cryptographic-operation-reference">
+<span id="crypto-operations"></span><h1>Cryptographic operation reference</h1>
+<div class="toctree-wrapper compound">
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="hashes.html">Message digests</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="hashes.html#hash-algorithms">Hash algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_MD2"><code class="docutils literal"><span class="pre">PSA_ALG_MD2</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_MD4"><code class="docutils literal"><span class="pre">PSA_ALG_MD4</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_MD5"><code class="docutils literal"><span class="pre">PSA_ALG_MD5</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_RIPEMD160"><code class="docutils literal"><span class="pre">PSA_ALG_RIPEMD160</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA_1"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_1</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA_224"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_224</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA_384"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_384</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA_512"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA_512_224"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512_224</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA_512_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_512_256</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA3_224"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_224</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA3_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_256</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA3_384"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_384</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_ALG_SHA3_512"><code class="docutils literal"><span class="pre">PSA_ALG_SHA3_512</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="hashes.html#single-part-hashing-functions">Single-part hashing functions</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_compute"><code class="docutils literal"><span class="pre">psa_hash_compute</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_compare"><code class="docutils literal"><span class="pre">psa_hash_compare</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="hashes.html#multi-part-hashing-operations">Multi-part hashing operations</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_operation_t"><code class="docutils literal"><span class="pre">psa_hash_operation_t</span></code> (type)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_HASH_OPERATION_INIT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_operation_init"><code class="docutils literal"><span class="pre">psa_hash_operation_init</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_setup"><code class="docutils literal"><span class="pre">psa_hash_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_update"><code class="docutils literal"><span class="pre">psa_hash_update</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_finish"><code class="docutils literal"><span class="pre">psa_hash_finish</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_verify"><code class="docutils literal"><span class="pre">psa_hash_verify</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_abort"><code class="docutils literal"><span class="pre">psa_hash_abort</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_suspend"><code class="docutils literal"><span class="pre">psa_hash_suspend</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_resume"><code class="docutils literal"><span class="pre">psa_hash_resume</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#psa_hash_clone"><code class="docutils literal"><span class="pre">psa_hash_clone</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="hashes.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_SUSPEND_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_ALGORITHM_FIELD_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_INPUT_LENGTH_FIELD_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_SUSPEND_HASH_STATE_FIELD_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="hashes.html#PSA_HASH_BLOCK_LENGTH"><code class="docutils literal"><span class="pre">PSA_HASH_BLOCK_LENGTH</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="hashes.html#hash-suspend-state">Hash suspend state</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="macs.html">Message authentication codes (MAC)</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="macs.html#mac-algorithms">MAC algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_ALG_HMAC"><code class="docutils literal"><span class="pre">PSA_ALG_HMAC</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_ALG_TRUNCATED_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_TRUNCATED_MAC</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_ALG_CBC_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_CBC_MAC</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_ALG_CMAC"><code class="docutils literal"><span class="pre">PSA_ALG_CMAC</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="macs.html#single-part-mac-functions">Single-part MAC functions</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_compute"><code class="docutils literal"><span class="pre">psa_mac_compute</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_verify"><code class="docutils literal"><span class="pre">psa_mac_verify</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="macs.html#multi-part-mac-operations">Multi-part MAC operations</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_operation_t"><code class="docutils literal"><span class="pre">psa_mac_operation_t</span></code> (type)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_MAC_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_MAC_OPERATION_INIT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_operation_init"><code class="docutils literal"><span class="pre">psa_mac_operation_init</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_sign_setup"><code class="docutils literal"><span class="pre">psa_mac_sign_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_verify_setup"><code class="docutils literal"><span class="pre">psa_mac_verify_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_update"><code class="docutils literal"><span class="pre">psa_mac_update</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_sign_finish"><code class="docutils literal"><span class="pre">psa_mac_sign_finish</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_verify_finish"><code class="docutils literal"><span class="pre">psa_mac_verify_finish</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#psa_mac_abort"><code class="docutils literal"><span class="pre">psa_mac_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="macs.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_ALG_IS_HMAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HMAC</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_ALG_IS_BLOCK_CIPHER_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_BLOCK_CIPHER_MAC</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_ALG_FULL_LENGTH_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_FULL_LENGTH_MAC</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_MAC_LENGTH"><code class="docutils literal"><span class="pre">PSA_MAC_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="macs.html#PSA_MAC_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="ciphers.html">Unauthenticated ciphers</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="ciphers.html#cipher-algorithms">Cipher algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_STREAM_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_STREAM_CIPHER</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_CTR"><code class="docutils literal"><span class="pre">PSA_ALG_CTR</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_CFB"><code class="docutils literal"><span class="pre">PSA_ALG_CFB</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_OFB"><code class="docutils literal"><span class="pre">PSA_ALG_OFB</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_XTS"><code class="docutils literal"><span class="pre">PSA_ALG_XTS</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_ECB_NO_PADDING"><code class="docutils literal"><span class="pre">PSA_ALG_ECB_NO_PADDING</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_CBC_NO_PADDING"><code class="docutils literal"><span class="pre">PSA_ALG_CBC_NO_PADDING</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_CBC_PKCS7"><code class="docutils literal"><span class="pre">PSA_ALG_CBC_PKCS7</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="ciphers.html#single-part-cipher-functions">Single-part cipher functions</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_encrypt"><code class="docutils literal"><span class="pre">psa_cipher_encrypt</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_decrypt"><code class="docutils literal"><span class="pre">psa_cipher_decrypt</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="ciphers.html#multi-part-cipher-operations">Multi-part cipher operations</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_operation_t"><code class="docutils literal"><span class="pre">psa_cipher_operation_t</span></code> (type)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_CIPHER_OPERATION_INIT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_operation_init"><code class="docutils literal"><span class="pre">psa_cipher_operation_init</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_encrypt_setup"><code class="docutils literal"><span class="pre">psa_cipher_encrypt_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_decrypt_setup"><code class="docutils literal"><span class="pre">psa_cipher_decrypt_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_generate_iv"><code class="docutils literal"><span class="pre">psa_cipher_generate_iv</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_set_iv"><code class="docutils literal"><span class="pre">psa_cipher_set_iv</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_update"><code class="docutils literal"><span class="pre">psa_cipher_update</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_finish"><code class="docutils literal"><span class="pre">psa_cipher_finish</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#psa_cipher_abort"><code class="docutils literal"><span class="pre">psa_cipher_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="ciphers.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_ALG_IS_STREAM_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_STREAM_CIPHER</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_IV_LENGTH"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_IV_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_IV_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_BLOCK_CIPHER_BLOCK_LENGTH"><code class="docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ciphers.html#PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="aead.html">Authenticated encryption with associated data (AEAD)</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="aead.html#aead-algorithms">AEAD algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_ALG_CCM"><code class="docutils literal"><span class="pre">PSA_ALG_CCM</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_ALG_GCM"><code class="docutils literal"><span class="pre">PSA_ALG_GCM</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_ALG_CHACHA20_POLY1305"><code class="docutils literal"><span class="pre">PSA_ALG_CHACHA20_POLY1305</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_ALG_AEAD_WITH_SHORTENED_TAG"><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_SHORTENED_TAG</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="aead.html#single-part-aead-functions">Single-part AEAD functions</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_encrypt"><code class="docutils literal"><span class="pre">psa_aead_encrypt</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_decrypt"><code class="docutils literal"><span class="pre">psa_aead_decrypt</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="aead.html#multi-part-aead-operations">Multi-part AEAD operations</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_operation_t"><code class="docutils literal"><span class="pre">psa_aead_operation_t</span></code> (type)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_operation_init"><code class="docutils literal"><span class="pre">psa_aead_operation_init</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_encrypt_setup"><code class="docutils literal"><span class="pre">psa_aead_encrypt_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_decrypt_setup"><code class="docutils literal"><span class="pre">psa_aead_decrypt_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_generate_nonce"><code class="docutils literal"><span class="pre">psa_aead_generate_nonce</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_set_nonce"><code class="docutils literal"><span class="pre">psa_aead_set_nonce</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_set_lengths"><code class="docutils literal"><span class="pre">psa_aead_set_lengths</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_update_ad"><code class="docutils literal"><span class="pre">psa_aead_update_ad</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_update"><code class="docutils literal"><span class="pre">psa_aead_update</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_finish"><code class="docutils literal"><span class="pre">psa_aead_finish</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_verify"><code class="docutils literal"><span class="pre">psa_aead_verify</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#psa_aead_abort"><code class="docutils literal"><span class="pre">psa_aead_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="aead.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG"><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_NONCE_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_TAG_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_TAG_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="aead.html#PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="kdf.html">Key derivation</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="kdf.html#key-derivation-algorithms">Key derivation algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_ALG_HKDF"><code class="docutils literal"><span class="pre">PSA_ALG_HKDF</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_ALG_TLS12_PRF"><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PRF</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_ALG_TLS12_PSK_TO_MS"><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PSK_TO_MS</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="kdf.html#input-step-types">Input step types</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_step_t"><code class="docutils literal"><span class="pre">psa_key_derivation_step_t</span></code> (type)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_INPUT_SECRET"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_INPUT_LABEL"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_LABEL</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_INPUT_CONTEXT"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_CONTEXT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_INPUT_SALT"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SALT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_INPUT_INFO"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_INFO</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_INPUT_SEED"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SEED</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="kdf.html#key-derivation-functions">Key derivation functions</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_operation_t"><code class="docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code> (type)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_OPERATION_INIT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_operation_init"><code class="docutils literal"><span class="pre">psa_key_derivation_operation_init</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_setup"><code class="docutils literal"><span class="pre">psa_key_derivation_setup</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_get_capacity"><code class="docutils literal"><span class="pre">psa_key_derivation_get_capacity</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_set_capacity"><code class="docutils literal"><span class="pre">psa_key_derivation_set_capacity</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_input_bytes"><code class="docutils literal"><span class="pre">psa_key_derivation_input_bytes</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_input_key"><code class="docutils literal"><span class="pre">psa_key_derivation_input_key</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_output_bytes"><code class="docutils literal"><span class="pre">psa_key_derivation_output_bytes</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_output_key"><code class="docutils literal"><span class="pre">psa_key_derivation_output_key</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#psa_key_derivation_abort"><code class="docutils literal"><span class="pre">psa_key_derivation_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="kdf.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_ALG_IS_HKDF"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HKDF</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_ALG_IS_TLS12_PRF"><code class="docutils literal"><span class="pre">PSA_ALG_IS_TLS12_PRF</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_ALG_IS_TLS12_PSK_TO_MS"><code class="docutils literal"><span class="pre">PSA_ALG_IS_TLS12_PSK_TO_MS</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_KEY_DERIVATION_UNLIMITED_CAPACITY"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_UNLIMITED_CAPACITY</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="kdf.html#PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="sign.html">Asymmetric signature</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="sign.html#asymmetric-signature-algorithms">Asymmetric signature algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_RSA_PKCS1V15_SIGN"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_RSA_PKCS1V15_SIGN_RAW"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN_RAW</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_RSA_PSS"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PSS</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_ECDSA_ANY"><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA_ANY</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_DETERMINISTIC_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_DETERMINISTIC_ECDSA</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="sign.html#asymmetric-signature-functions">Asymmetric signature functions</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#psa_sign_message"><code class="docutils literal"><span class="pre">psa_sign_message</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#psa_verify_message"><code class="docutils literal"><span class="pre">psa_verify_message</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#psa_sign_hash"><code class="docutils literal"><span class="pre">psa_sign_hash</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#psa_verify_hash"><code class="docutils literal"><span class="pre">psa_verify_hash</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="sign.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_SIGN_MESSAGE"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_MESSAGE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_SIGN_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_HASH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_RSA_PKCS1V15_SIGN"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_PKCS1V15_SIGN</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_RSA_PSS"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_PSS</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ECDSA</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_DETERMINISTIC_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_IS_DETERMINISTIC_ECDSA</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_RANDOMIZED_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RANDOMIZED_ECDSA</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_IS_HASH_AND_SIGN"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH_AND_SIGN</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_ALG_ANY_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_SIGN_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="sign.html#PSA_SIGNATURE_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="pke.html">Asymmetric encryption</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="pke.html#asymmetric-encryption-algorithms">Asymmetric encryption algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#PSA_ALG_RSA_PKCS1V15_CRYPT"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#PSA_ALG_RSA_OAEP"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_OAEP</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="pke.html#asymmetric-encryption-functions">Asymmetric encryption functions</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#psa_asymmetric_encrypt"><code class="docutils literal"><span class="pre">psa_asymmetric_encrypt</span></code> (function)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#psa_asymmetric_decrypt"><code class="docutils literal"><span class="pre">psa_asymmetric_decrypt</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="pke.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#PSA_ALG_IS_RSA_OAEP"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_OAEP</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="pke.html#PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="ka.html">Key agreement</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="ka.html#key-agreement-algorithms">Key agreement algorithms</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_FFDH"><code class="docutils literal"><span class="pre">PSA_ALG_FFDH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_ECDH"><code class="docutils literal"><span class="pre">PSA_ALG_ECDH</span></code> (macro)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="ka.html#standalone-key-agreement">Standalone key agreement</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#psa_raw_key_agreement"><code class="docutils literal"><span class="pre">psa_raw_key_agreement</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="ka.html#combining-key-agreement-and-key-derivation">Combining key agreement and key derivation</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#psa_key_derivation_key_agreement"><code class="docutils literal"><span class="pre">psa_key_derivation_key_agreement</span></code> (function)</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="ka.html#support-macros">Support macros</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_KEY_AGREEMENT_GET_BASE"><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_BASE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_KEY_AGREEMENT_GET_KDF"><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_KDF</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_IS_RAW_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RAW_KEY_AGREEMENT</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_IS_FFDH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_FFDH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_ALG_IS_ECDH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ECDH</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li class="toctree-l3"><a class="reference internal" href="ka.html#PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="rng.html">Other cryptographic services</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="rng.html#random-number-generation">Random number generation</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="rng.html#psa_generate_random"><code class="docutils literal"><span class="pre">psa_generate_random</span></code> (function)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+
+          </div>
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+  <li><a href="../../index.html">Documentation overview</a><ul>
+      <li>Previous: <a href="../keys/management.html" title="previous chapter">Key management functions</a></li>
+      <li>Next: <a href="hashes.html" title="next chapter">Message digests</a></li>
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+  <div class="section" id="key-agreement">
+<span id="id1"></span><h1>Key agreement</h1>
+<div class="section" id="key-agreement-algorithms">
+<span id="id2"></span><h2>Key agreement algorithms</h2>
+<div class="section" id="PSA_ALG_KEY_AGREEMENT">
+<span id="c.PSA_ALG_KEY_AGREEMENT"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT</span></code> (macro)</h3>
+<p>Macro to build a combined algorithm that chains a key agreement with a key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT" title="PSA_ALG_KEY_AGREEMENT">PSA_ALG_KEY_AGREEMENT</a>(ka_alg, kdf_alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">ka_alg</span></code></dt>
+<dd>A key agreement algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_KEY_AGREEMENT" title="PSA_ALG_IS_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_KEY_AGREEMENT</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">ka_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">kdf_alg</span></code></dt>
+<dd>A key derivation algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_KEY_DERIVATION" title="PSA_ALG_IS_KEY_DERIVATION"><code class="docutils literal"><span class="pre">PSA_ALG_IS_KEY_DERIVATION</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">kdf_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding key agreement and derivation algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">ka_alg</span></code> is not a supported key agreement algorithm or <code class="docutils literal"><span class="pre">kdf_alg</span></code> is not a supported key derivation algorithm.</p>
+<p class="rubric">Description</p>
+<p>The component parts of a key agreement algorithm can be extracted using <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT_GET_BASE" title="PSA_ALG_KEY_AGREEMENT_GET_BASE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_BASE()</span></code></a> and <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT_GET_KDF" title="PSA_ALG_KEY_AGREEMENT_GET_KDF"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_KDF()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_FFDH">
+<span id="c.PSA_ALG_FFDH"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_FFDH</span></code> (macro)</h3>
+<p>The finite-field Diffie-Hellman (DH) key agreement algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_FFDH" title="PSA_ALG_FFDH">PSA_ALG_FFDH</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x09010000)
+</pre>
+<p>The shared secret produced by key agreement is <code class="docutils literal"><span class="pre">g^{ab}</span></code> in big-endian format. It is <code class="docutils literal"><span class="pre">ceiling(m</span> <span class="pre">/</span> <span class="pre">8)</span></code> bytes long where <code class="docutils literal"><span class="pre">m</span></code> is the size of the prime <code class="docutils literal"><span class="pre">p</span></code> in bits.</p>
+</div>
+<div class="section" id="PSA_ALG_ECDH">
+<span id="c.PSA_ALG_ECDH"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_ECDH</span></code> (macro)</h3>
+<p>The elliptic curve Diffie-Hellman (ECDH) key agreement algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_ECDH" title="PSA_ALG_ECDH">PSA_ALG_ECDH</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x09020000)
+</pre>
+<p>The shared secret produced by key agreement is the x-coordinate of the shared secret point. It is always <code class="docutils literal"><span class="pre">ceiling(m</span> <span class="pre">/</span> <span class="pre">8)</span></code> bytes long where <code class="docutils literal"><span class="pre">m</span></code> is the bit size associated with the curve, i.e. the bit size of the order of the curve’s coordinate field. When <code class="docutils literal"><span class="pre">m</span></code> is not a multiple of 8, the byte containing the most significant bit of the shared secret is padded with zero bits. The byte order is either little-endian or big-endian depending on the curve type.</p>
+<ul class="simple">
+<li>For Montgomery curves (curve family <a class="reference internal" href="../keys/types.html#c.PSA_ECC_FAMILY_MONTGOMERY" title="PSA_ECC_FAMILY_MONTGOMERY"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ECC_FAMILY_MONTGOMERY</span></code></a>), the shared secret is the x-coordinate of <code class="docutils literal"><span class="pre">d_A</span> <span class="pre">Q_B</span> <span class="pre">=</span> <span class="pre">d_B</span> <span class="pre">Q_A</span></code> in little-endian byte order. The bit size is 448 for Curve448 and 255 for Curve25519.</li>
+<li>For Weierstrass curves over prime fields (curve families <code class="docutils literal"><span class="pre">PSA_ECC_FAMILY_SECP_XX</span></code>, <a class="reference internal" href="../keys/types.html#c.PSA_ECC_FAMILY_BRAINPOOL_P_R1" title="PSA_ECC_FAMILY_BRAINPOOL_P_R1"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ECC_FAMILY_BRAINPOOL_P_R1</span></code></a> and <a class="reference internal" href="../keys/types.html#c.PSA_ECC_FAMILY_FRP" title="PSA_ECC_FAMILY_FRP"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ECC_FAMILY_FRP</span></code></a>), the shared secret is the x-coordinate of <code class="docutils literal"><span class="pre">d_A</span> <span class="pre">Q_B</span> <span class="pre">=</span> <span class="pre">d_B</span> <span class="pre">Q_A</span></code> in big-endian byte order. The bit size is <code class="docutils literal"><span class="pre">m</span> <span class="pre">=</span> <span class="pre">ceiling(log_2(p))</span></code> for the field <code class="docutils literal"><span class="pre">F_p</span></code>.</li>
+<li>For Weierstrass curves over binary fields (curve families <code class="docutils literal"><span class="pre">PSA_ECC_FAMILY_SECT_XX</span></code>), the shared secret is the x-coordinate of <code class="docutils literal"><span class="pre">d_A</span> <span class="pre">Q_B</span> <span class="pre">=</span> <span class="pre">d_B</span> <span class="pre">Q_A</span></code> in big-endian byte order. The bit size is <code class="docutils literal"><span class="pre">m</span></code> for the field <code class="docutils literal"><span class="pre">F_{2^m}</span></code>.</li>
+</ul>
+</div>
+</div>
+<div class="section" id="standalone-key-agreement">
+<h2>Standalone key agreement</h2>
+<div class="section" id="psa_raw_key_agreement">
+<span id="c.psa_raw_key_agreement"></span><h3><code class="docutils literal"><span class="pre">psa_raw_key_agreement</span></code> (function)</h3>
+<p>Perform a key agreement and return the raw shared secret.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_raw_key_agreement" title="psa_raw_key_agreement">psa_raw_key_agreement</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                                   <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> private_key,
+                                   const uint8_t * peer_key,
+                                   size_t peer_key_length,
+                                   uint8_t * output,
+                                   size_t output_size,
+                                   size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The key agreement algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="#c.PSA_ALG_IS_RAW_KEY_AGREEMENT" title="PSA_ALG_IS_RAW_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RAW_KEY_AGREEMENT</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">private_key</span></code></dt>
+<dd>Identifier of the private key to use.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DERIVE" title="PSA_KEY_USAGE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DERIVE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">peer_key</span></code></dt>
+<dd>Public key of the peer. It must be in the same format that <a class="reference internal" href="../keys/management.html#c.psa_import_key" title="psa_import_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_import_key()</span></code></a> accepts. The standard formats for public keys are documented in the documentation of <a class="reference internal" href="../keys/management.html#c.psa_export_public_key" title="psa_export_public_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_export_public_key()</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">peer_key_length</span></code></dt>
+<dd>Size of <code class="docutils literal"><span class="pre">peer_key</span></code> in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the decrypted message is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes.
+This must be appropriate for the keys:</p>
+<ul class="last simple">
+<li>The required output size is <a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">bits</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">type</span></code> is the type of <code class="docutils literal"><span class="pre">private_key</span></code> and <code class="docutils literal"><span class="pre">bits</span></code> is the bit-size of either <code class="docutils literal"><span class="pre">private_key</span></code> or the <code class="docutils literal"><span class="pre">peer_key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported raw key agreement algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DERIVE" title="PSA_KEY_USAGE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DERIVE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not a key agreement algorithm</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">private_key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>, or <code class="docutils literal"><span class="pre">peer_key</span></code> is not valid for <code class="docutils literal"><span class="pre">alg</span></code> or not compatible with <code class="docutils literal"><span class="pre">private_key</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not a supported key agreement algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">The raw result of a key agreement algorithm such as finite-field Diffie-Hellman or elliptic curve Diffie-Hellman has biases, and is not suitable for use as key material. Instead it is recommended that the result is used as input to a key derivation algorithm. To chain a key agreement with a key derivation, use <a class="reference internal" href="#c.psa_key_derivation_key_agreement" title="psa_key_derivation_key_agreement"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_key_agreement()</span></code></a> and other functions from the key derivation interface.</p>
+</div>
+</div>
+</div>
+<div class="section" id="combining-key-agreement-and-key-derivation">
+<h2>Combining key agreement and key derivation</h2>
+<div class="section" id="psa_key_derivation_key_agreement">
+<span id="c.psa_key_derivation_key_agreement"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_key_agreement</span></code> (function)</h3>
+<p>Perform a key agreement and use the shared secret as input to a key derivation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_key_agreement" title="psa_key_derivation_key_agreement">psa_key_derivation_key_agreement</a>(<a class="reference internal" href="kdf.html#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                              <a class="reference internal" href="kdf.html#c.psa_key_derivation_step_t" title="psa_key_derivation_step_t">psa_key_derivation_step_t</a> step,
+                                              <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> private_key,
+                                              const uint8_t * peer_key,
+                                              size_t peer_key_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The key derivation operation object to use. It must have been set up with <a class="reference internal" href="kdf.html#c.psa_key_derivation_setup" title="psa_key_derivation_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_setup()</span></code></a> with a key agreement and derivation algorithm <code class="docutils literal"><span class="pre">alg</span></code> (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_KEY_AGREEMENT" title="PSA_ALG_IS_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_KEY_AGREEMENT</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true and <a class="reference internal" href="#c.PSA_ALG_IS_RAW_KEY_AGREEMENT" title="PSA_ALG_IS_RAW_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RAW_KEY_AGREEMENT</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is false). The operation must be ready for an input of the type given by <code class="docutils literal"><span class="pre">step</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">step</span></code></dt>
+<dd>Which step the input data is for.</dd>
+<dt> <code class="docutils literal"><span class="pre">private_key</span></code></dt>
+<dd>Identifier of the private key to use.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DERIVE" title="PSA_KEY_USAGE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DERIVE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">peer_key</span></code></dt>
+<dd>Public key of the peer. The peer key must be in the same format that <a class="reference internal" href="../keys/management.html#c.psa_import_key" title="psa_import_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_import_key()</span></code></a> accepts for the public key type corresponding to the type of private_key. That is, this function performs the equivalent of <a class="reference internal" href="../keys/management.html#c.psa_import_key" title="psa_import_key"><code class="docutils literal"><span class="pre">psa_import_key</span></code></a><code class="docutils literal"><span class="pre">(...,</span> </code><code class="docutils literal"><span class="pre">peer_key</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">peer_key_length</span></code><code class="docutils literal"><span class="pre">)</span></code> where with key attributes indicating the public key type corresponding to the type of <code class="docutils literal"><span class="pre">private_key</span></code>. For example, for EC keys, this means that peer_key is interpreted as a point on the curve that the private key is on. The standard formats for public keys are documented in the documentation of <a class="reference internal" href="../keys/management.html#c.psa_export_public_key" title="psa_export_public_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_export_public_key()</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">peer_key_length</span></code></dt>
+<dd>Size of <code class="docutils literal"><span class="pre">peer_key</span></code> in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid for this key agreement <code class="docutils literal"><span class="pre">step</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DERIVE" title="PSA_KEY_USAGE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DERIVE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">private_key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>, or <code class="docutils literal"><span class="pre">peer_key</span></code> is not valid for <code class="docutils literal"><span class="pre">alg</span></code> or not compatible with <code class="docutils literal"><span class="pre">private_key</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a key derivation algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">step</span></code> does not allow an input resulting from a key agreement.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>A key agreement algorithm takes two inputs: a private key <code class="docutils literal"><span class="pre">private_key</span></code> a public key <code class="docutils literal"><span class="pre">peer_key</span></code>. The result of this function is passed as input to a key derivation. The output of this key derivation can be extracted by reading from the resulting operation to produce keys and other cryptographic material.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="kdf.html#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a>.</p>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_ALG_KEY_AGREEMENT_GET_BASE">
+<span id="c.PSA_ALG_KEY_AGREEMENT_GET_BASE"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_BASE</span></code> (macro)</h3>
+<p>Get the raw key agreement algorithm from a full key agreement algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT_GET_BASE" title="PSA_ALG_KEY_AGREEMENT_GET_BASE">PSA_ALG_KEY_AGREEMENT_GET_BASE</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A key agreement algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a> such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_KEY_AGREEMENT" title="PSA_ALG_IS_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_KEY_AGREEMENT</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The underlying raw key agreement algorithm if <code class="docutils literal"><span class="pre">alg</span></code> is a key agreement algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">alg</span></code> is not a key agreement algorithm or if it is not supported by the implementation.</p>
+<p class="rubric">Description</p>
+<p>See also <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT" title="PSA_ALG_KEY_AGREEMENT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT()</span></code></a> and <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT_GET_KDF" title="PSA_ALG_KEY_AGREEMENT_GET_KDF"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_KDF()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_KEY_AGREEMENT_GET_KDF">
+<span id="c.PSA_ALG_KEY_AGREEMENT_GET_KDF"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_KDF</span></code> (macro)</h3>
+<p>Get the key derivation algorithm used in a full key agreement algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT_GET_KDF" title="PSA_ALG_KEY_AGREEMENT_GET_KDF">PSA_ALG_KEY_AGREEMENT_GET_KDF</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A key agreement algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a> such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_KEY_AGREEMENT" title="PSA_ALG_IS_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_KEY_AGREEMENT</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The underlying key derivation algorithm if <code class="docutils literal"><span class="pre">alg</span></code> is a key agreement algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">alg</span></code> is not a key agreement algorithm or if it is not supported by the implementation.</p>
+<p class="rubric">Description</p>
+<p>See also <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT" title="PSA_ALG_KEY_AGREEMENT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT()</span></code></a> and <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT_GET_BASE" title="PSA_ALG_KEY_AGREEMENT_GET_BASE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_BASE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_RAW_KEY_AGREEMENT">
+<span id="c.PSA_ALG_IS_RAW_KEY_AGREEMENT"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_RAW_KEY_AGREEMENT</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a raw key agreement algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_RAW_KEY_AGREEMENT" title="PSA_ALG_IS_RAW_KEY_AGREEMENT">PSA_ALG_IS_RAW_KEY_AGREEMENT</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a raw key agreement algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>A raw key agreement algorithm is one that does not specify a key derivation function. Usually, raw key agreement algorithms are constructed directly with a <code class="docutils literal"><span class="pre">PSA_ALG_xxx</span></code> macro while non-raw key agreement algorithms are constructed with <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT" title="PSA_ALG_KEY_AGREEMENT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT()</span></code></a>.</p>
+<p>The raw key agreement algorithm can be extracted from a full key agreement algorithm identifier using <a class="reference internal" href="#c.PSA_ALG_KEY_AGREEMENT_GET_BASE" title="PSA_ALG_KEY_AGREEMENT_GET_BASE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_BASE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_FFDH">
+<span id="c.PSA_ALG_IS_FFDH"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_FFDH</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a finite field Diffie-Hellman algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_FFDH" title="PSA_ALG_IS_FFDH">PSA_ALG_IS_FFDH</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a finite field Diffie-Hellman algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported key agreement algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>This includes the raw finite field Diffie-Hellman algorithm as well as finite-field Diffie-Hellman followed by any supporter key derivation algorithm.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_ECDH">
+<span id="c.PSA_ALG_IS_ECDH"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_ECDH</span></code> (macro)</h3>
+<p>Whether the specified algorithm is an elliptic curve Diffie-Hellman algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_ECDH" title="PSA_ALG_IS_ECDH">PSA_ALG_IS_ECDH</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an elliptic curve Diffie-Hellman algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported key agreement algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>This includes the raw elliptic curve Diffie-Hellman algorithm as well as elliptic curve Diffie-Hellman followed by any supporter key derivation algorithm.</p>
+</div>
+<div class="section" id="PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE">
+<span id="c.PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>Sufficient output buffer size for <a class="reference internal" href="#c.psa_raw_key_agreement" title="psa_raw_key_agreement"><code class="xref any c c-func docutils literal"><span class="pre">psa_raw_key_agreement()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE">PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE</a>(key_type, key_bits) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>A supported key type.</dd>
+<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
+<dd>The size of the key in bits.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>If the parameters are valid and supported, return a buffer size in bytes that guarantees that <a class="reference internal" href="#c.psa_raw_key_agreement" title="psa_raw_key_agreement"><code class="xref any c c-func docutils literal"><span class="pre">psa_raw_key_agreement()</span></code></a> will not fail with <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a>. If the parameters are a valid combination that is not supported by the implementation, this macro must return either a sensible size or <code class="docutils literal"><span class="pre">0</span></code>. If the parameters are not valid, the return value is unspecified.</p>
+<p class="rubric">Description</p>
+<p>This macro returns a compile-time constant if its arguments are compile-time constants.</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">This function might evaluate its arguments multiple times or zero times. Providing arguments that have side effects will result in implementation-specific behavior, and is non-portable.</p>
+</div>
+<p>See also <a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE">
+<span id="c.PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>Maximum size of the output from <a class="reference internal" href="#c.psa_raw_key_agreement" title="psa_raw_key_agreement"><code class="xref any c c-func docutils literal"><span class="pre">psa_raw_key_agreement()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE">PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE</a> \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This macro must expand to a compile-time constant integer.
+It is recommended that this value is the maximum size of the output any raw key agreement algorithm supported by the implementation, in bytes. The value must not be smaller than this maximum.</p>
+<p>See also <a class="reference internal" href="#c.PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE" title="PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Key agreement</a><ul>
+<li><a class="reference internal" href="#key-agreement-algorithms">Key agreement algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_FFDH"><code class="docutils literal"><span class="pre">PSA_ALG_FFDH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_ECDH"><code class="docutils literal"><span class="pre">PSA_ALG_ECDH</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#standalone-key-agreement">Standalone key agreement</a><ul>
+<li><a class="reference internal" href="#psa_raw_key_agreement"><code class="docutils literal"><span class="pre">psa_raw_key_agreement</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#combining-key-agreement-and-key-derivation">Combining key agreement and key derivation</a><ul>
+<li><a class="reference internal" href="#psa_key_derivation_key_agreement"><code class="docutils literal"><span class="pre">psa_key_derivation_key_agreement</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_KEY_AGREEMENT_GET_BASE"><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_BASE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_KEY_AGREEMENT_GET_KDF"><code class="docutils literal"><span class="pre">PSA_ALG_KEY_AGREEMENT_GET_KDF</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_RAW_KEY_AGREEMENT"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RAW_KEY_AGREEMENT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_FFDH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_FFDH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_ECDH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ECDH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
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+  <div class="section" id="key-derivation">
+<span id="kdf"></span><h1>Key derivation</h1>
+<div class="section" id="key-derivation-algorithms">
+<span id="id1"></span><h2>Key derivation algorithms</h2>
+<div class="section" id="PSA_ALG_HKDF">
+<span id="c.PSA_ALG_HKDF"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_HKDF</span></code> (macro)</h3>
+<p>Macro to build an HKDF algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_HKDF" title="PSA_ALG_HKDF">PSA_ALG_HKDF</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding HKDF algorithm. For example, <a class="reference internal" href="#c.PSA_ALG_HKDF" title="PSA_ALG_HKDF"><code class="docutils literal"><span class="pre">PSA_ALG_HKDF</span></code></a><code class="docutils literal"><span class="pre">(</span></code><a class="reference internal" href="hashes.html#c.PSA_ALG_SHA_256" title="PSA_ALG_SHA_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code></a><code class="docutils literal"><span class="pre">)</span></code> is HKDF using HMAC-SHA-256.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>This key derivation algorithm uses the following inputs:</p>
+<ul class="simple">
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SALT" title="PSA_KEY_DERIVATION_INPUT_SALT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SALT</span></code></a> is the salt used in the “extract” step. It is optional; if omitted, the derivation uses an empty salt.</li>
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SECRET" title="PSA_KEY_DERIVATION_INPUT_SECRET"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code></a> is the secret key used in the “extract” step.</li>
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_INFO" title="PSA_KEY_DERIVATION_INPUT_INFO"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_INFO</span></code></a> is the info string used in the “expand” step.</li>
+</ul>
+<p>If <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SALT" title="PSA_KEY_DERIVATION_INPUT_SALT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SALT</span></code></a> is provided, it must be before <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SECRET" title="PSA_KEY_DERIVATION_INPUT_SECRET"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code></a>. <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_INFO" title="PSA_KEY_DERIVATION_INPUT_INFO"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_INFO</span></code></a> can be provided at any time after setup and before starting to generate output.</p>
+</div>
+<div class="section" id="PSA_ALG_TLS12_PRF">
+<span id="c.PSA_ALG_TLS12_PRF"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PRF</span></code> (macro)</h3>
+<p>Macro to build a TLS-1.2 PRF algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_TLS12_PRF" title="PSA_ALG_TLS12_PRF">PSA_ALG_TLS12_PRF</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding TLS-1.2 PRF algorithm. For example, <a class="reference internal" href="#c.PSA_ALG_TLS12_PRF" title="PSA_ALG_TLS12_PRF"><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PRF</span></code></a><code class="docutils literal"><span class="pre">(</span></code><a class="reference internal" href="hashes.html#c.PSA_ALG_SHA_256" title="PSA_ALG_SHA_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code></a><code class="docutils literal"><span class="pre">)</span></code> represents the TLS 1.2 PRF using HMAC-SHA-256.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>TLS 1.2 uses a custom pseudorandom function (PRF) for key schedule, specified in <a class="reference external" href="https://tools.ietf.org/html/rfc5246.html#section-5">RFC 5246 §5</a>. It is based on HMAC and can be used with either SHA-256 or SHA-384.</p>
+<p>This key derivation algorithm uses the following inputs, which must be passed in the order given here:</p>
+<ul class="simple">
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SEED" title="PSA_KEY_DERIVATION_INPUT_SEED"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SEED</span></code></a> is the seed.</li>
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SECRET" title="PSA_KEY_DERIVATION_INPUT_SECRET"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code></a> is the secret key.</li>
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_LABEL" title="PSA_KEY_DERIVATION_INPUT_LABEL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_LABEL</span></code></a> is the label.</li>
+</ul>
+<p>For the application to TLS-1.2 key expansion:</p>
+<ul class="simple">
+<li>The seed is the concatenation of <code class="docutils literal"><span class="pre">ServerHello.Random</span> <span class="pre">+</span> <span class="pre">ClientHello.Random</span></code>.</li>
+<li>The label is <code class="docutils literal"><span class="pre">&quot;key</span> <span class="pre">expansion&quot;</span></code>.</li>
+</ul>
+</div>
+<div class="section" id="PSA_ALG_TLS12_PSK_TO_MS">
+<span id="c.PSA_ALG_TLS12_PSK_TO_MS"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PSK_TO_MS</span></code> (macro)</h3>
+<p>Macro to build a TLS-1.2 PSK-to-MasterSecret algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_TLS12_PSK_TO_MS" title="PSA_ALG_TLS12_PSK_TO_MS">PSA_ALG_TLS12_PSK_TO_MS</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding TLS-1.2 PSK to MS algorithm. For example, <a class="reference internal" href="#c.PSA_ALG_TLS12_PSK_TO_MS" title="PSA_ALG_TLS12_PSK_TO_MS"><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PSK_TO_MS</span></code></a><code class="docutils literal"><span class="pre">(</span></code><a class="reference internal" href="hashes.html#c.PSA_ALG_SHA_256" title="PSA_ALG_SHA_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code></a><code class="docutils literal"><span class="pre">)</span></code> represents the TLS-1.2 PSK to MasterSecret derivation PRF using HMAC-SHA-256.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>In a pure-PSK handshake in TLS 1.2, the master secret (MS) is derived from the pre-shared key (PSK) through the application of padding (<a class="reference external" href="https://tools.ietf.org/html/rfc4279.html#section-2">RFC 4279 §2</a>) and the TLS-1.2 PRF (<a class="reference external" href="https://tools.ietf.org/html/rfc5246.html#section-5">RFC 5246 §5</a>). The latter is based on HMAC and can be used with either SHA-256 or SHA-384.</p>
+<p>This key derivation algorithm uses the following inputs, which must be passed in the order given here:</p>
+<ul class="simple">
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SEED" title="PSA_KEY_DERIVATION_INPUT_SEED"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SEED</span></code></a> is the seed.</li>
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SECRET" title="PSA_KEY_DERIVATION_INPUT_SECRET"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code></a> is the PSK. The PSK must not be larger than <a class="reference internal" href="#c.PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE" title="PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE</span></code></a>.</li>
+<li><a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_LABEL" title="PSA_KEY_DERIVATION_INPUT_LABEL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_LABEL</span></code></a> is the label.</li>
+</ul>
+<p>For the application to TLS-1.2:</p>
+<ul class="simple">
+<li>The seed, which is forwarded to the TLS-1.2 PRF, is the concatenation of the <code class="docutils literal"><span class="pre">ClientHello.Random</span> <span class="pre">+</span> <span class="pre">ServerHello.Random</span></code>.</li>
+<li>The label is <code class="docutils literal"><span class="pre">&quot;master</span> <span class="pre">secret&quot;</span></code> or <code class="docutils literal"><span class="pre">&quot;extended</span> <span class="pre">master</span> <span class="pre">secret&quot;</span></code>.</li>
+</ul>
+</div>
+</div>
+<div class="section" id="input-step-types">
+<h2>Input step types</h2>
+<div class="section" id="psa_key_derivation_step_t">
+<span id="c.psa_key_derivation_step_t"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_step_t</span></code> (type)</h3>
+<p>Encoding of the step of a key derivation.</p>
+<pre class="literal-block">
+typedef uint16_t <a class="reference internal" href="#c.psa_key_derivation_step_t" title="psa_key_derivation_step_t">psa_key_derivation_step_t</a>;
+</pre>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_INPUT_SECRET">
+<span id="c.PSA_KEY_DERIVATION_INPUT_SECRET"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code> (macro)</h3>
+<p>A secret input for key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SECRET" title="PSA_KEY_DERIVATION_INPUT_SECRET">PSA_KEY_DERIVATION_INPUT_SECRET</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This is typically a key of type <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_DERIVE" title="PSA_KEY_TYPE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_DERIVE</span></code></a> passed to <a class="reference internal" href="#c.psa_key_derivation_input_key" title="psa_key_derivation_input_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_input_key()</span></code></a>, or the shared secret resulting from a key agreement obtained via <a class="reference internal" href="ka.html#c.psa_key_derivation_key_agreement" title="psa_key_derivation_key_agreement"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_key_agreement()</span></code></a>.</p>
+<p>The secret can also be a direct input passed to <a class="reference internal" href="#c.psa_key_derivation_input_bytes" title="psa_key_derivation_input_bytes"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_input_bytes()</span></code></a>. In this case, the derivation operation cannot be used to derive keys: the operation will only allow <a class="reference internal" href="#c.psa_key_derivation_output_bytes" title="psa_key_derivation_output_bytes"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_output_bytes()</span></code></a>, not <a class="reference internal" href="#c.psa_key_derivation_output_key" title="psa_key_derivation_output_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_output_key()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_INPUT_LABEL">
+<span id="c.PSA_KEY_DERIVATION_INPUT_LABEL"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_LABEL</span></code> (macro)</h3>
+<p>A label for key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_LABEL" title="PSA_KEY_DERIVATION_INPUT_LABEL">PSA_KEY_DERIVATION_INPUT_LABEL</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This is typically a direct input. It can also be a key of type <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RAW_DATA" title="PSA_KEY_TYPE_RAW_DATA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RAW_DATA</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_INPUT_CONTEXT">
+<span id="c.PSA_KEY_DERIVATION_INPUT_CONTEXT"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_CONTEXT</span></code> (macro)</h3>
+<p>A context for key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_CONTEXT" title="PSA_KEY_DERIVATION_INPUT_CONTEXT">PSA_KEY_DERIVATION_INPUT_CONTEXT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This is typically a direct input. It can also be a key of type <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RAW_DATA" title="PSA_KEY_TYPE_RAW_DATA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RAW_DATA</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_INPUT_SALT">
+<span id="c.PSA_KEY_DERIVATION_INPUT_SALT"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SALT</span></code> (macro)</h3>
+<p>A salt for key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SALT" title="PSA_KEY_DERIVATION_INPUT_SALT">PSA_KEY_DERIVATION_INPUT_SALT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This is typically a direct input. It can also be a key of type <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RAW_DATA" title="PSA_KEY_TYPE_RAW_DATA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RAW_DATA</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_INPUT_INFO">
+<span id="c.PSA_KEY_DERIVATION_INPUT_INFO"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_INFO</span></code> (macro)</h3>
+<p>An information string for key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_INFO" title="PSA_KEY_DERIVATION_INPUT_INFO">PSA_KEY_DERIVATION_INPUT_INFO</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This is typically a direct input. It can also be a key of type <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RAW_DATA" title="PSA_KEY_TYPE_RAW_DATA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RAW_DATA</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_INPUT_SEED">
+<span id="c.PSA_KEY_DERIVATION_INPUT_SEED"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SEED</span></code> (macro)</h3>
+<p>A seed for key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SEED" title="PSA_KEY_DERIVATION_INPUT_SEED">PSA_KEY_DERIVATION_INPUT_SEED</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This is typically a direct input. It can also be a key of type <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RAW_DATA" title="PSA_KEY_TYPE_RAW_DATA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RAW_DATA</span></code></a>.</p>
+</div>
+</div>
+<div class="section" id="key-derivation-functions">
+<h2>Key derivation functions</h2>
+<div class="section" id="psa_key_derivation_operation_t">
+<span id="c.psa_key_derivation_operation_t"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code> (type)</h3>
+<p>The type of the state object for key derivation operations.</p>
+<pre class="literal-block">
+typedef <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-type"><span class="std std-ref">/* implementation-defined type */</span></a></em> <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a>;
+</pre>
+<p>Before calling any function on a key derivation operation object, the application must initialize it by any of the following means:</p>
+<ul>
+<li><p class="first">Set the object to all-bits-zero, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> operation;
+memset(&amp;operation, 0, sizeof(operation));
+</pre>
+</li>
+<li><p class="first">Initialize the object to logical zero values by declaring the object as static or global without an explicit initializer, for example:</p>
+<pre class="literal-block">
+static <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> operation;
+</pre>
+</li>
+<li><p class="first">Initialize the object to the initializer <a class="reference internal" href="#c.PSA_KEY_DERIVATION_OPERATION_INIT" title="PSA_KEY_DERIVATION_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_OPERATION_INIT</span></code></a>, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> operation = <a class="reference internal" href="#c.PSA_KEY_DERIVATION_OPERATION_INIT" title="PSA_KEY_DERIVATION_OPERATION_INIT">PSA_KEY_DERIVATION_OPERATION_INIT</a>;
+</pre>
+</li>
+<li><p class="first">Assign the result of the function <a class="reference internal" href="#c.psa_key_derivation_operation_init" title="psa_key_derivation_operation_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_operation_init()</span></code></a> to the object, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> operation;
+operation = <a class="reference internal" href="#c.psa_key_derivation_operation_init" title="psa_key_derivation_operation_init">psa_key_derivation_operation_init</a>();
+</pre>
+</li>
+</ul>
+<p>This is an implementation-defined type. Applications that make assumptions about the content of this object will result in in implementation-specific behavior, and are non-portable.</p>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_OPERATION_INIT">
+<span id="c.PSA_KEY_DERIVATION_OPERATION_INIT"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_OPERATION_INIT</span></code> (macro)</h3>
+<p>This macro returns a suitable initializer for a key derivation operation object of type <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_OPERATION_INIT" title="PSA_KEY_DERIVATION_OPERATION_INIT">PSA_KEY_DERIVATION_OPERATION_INIT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+</div>
+<div class="section" id="psa_key_derivation_operation_init">
+<span id="c.psa_key_derivation_operation_init"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_operation_init</span></code> (function)</h3>
+<p>Return an initial value for a key derivation operation object.</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> <a class="reference internal" href="#c.psa_key_derivation_operation_init" title="psa_key_derivation_operation_init">psa_key_derivation_operation_init</a>(void);
+</pre>
+<p class="rubric">Returns: <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t"><code class="docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code></a></p>
+</div>
+<div class="section" id="psa_key_derivation_setup">
+<span id="c.psa_key_derivation_setup"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_setup</span></code> (function)</h3>
+<p>Set up a key derivation operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_setup" title="psa_key_derivation_setup">psa_key_derivation_setup</a>(<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                      <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The key derivation operation object to set up. It must have been initialized but not set up yet.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The key derivation algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_KEY_DERIVATION" title="PSA_ALG_IS_KEY_DERIVATION"><code class="docutils literal"><span class="pre">PSA_ALG_IS_KEY_DERIVATION</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not a key derivation algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a key derivation algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>A key derivation algorithm takes some inputs and uses them to generate a byte stream in a deterministic way. This byte stream can be used to produce keys and other cryptographic material.</p>
+<p>To derive a key:</p>
+<ol class="arabic simple">
+<li>Start with an initialized object of type <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_key_derivation_setup" title="psa_key_derivation_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_setup()</span></code></a> to select the algorithm.</li>
+<li>Provide the inputs for the key derivation by calling <a class="reference internal" href="#c.psa_key_derivation_input_bytes" title="psa_key_derivation_input_bytes"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_input_bytes()</span></code></a> or <a class="reference internal" href="#c.psa_key_derivation_input_key" title="psa_key_derivation_input_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_input_key()</span></code></a> as appropriate. Which inputs are needed, in what order, whether keys are permitted, and what type of keys depends on the algorithm.</li>
+<li>Optionally set the operation’s maximum capacity with <a class="reference internal" href="#c.psa_key_derivation_set_capacity" title="psa_key_derivation_set_capacity"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_set_capacity()</span></code></a>. This can be done before, in the middle of, or after providing inputs. For some algorithms, this step is mandatory because the output depends on the maximum capacity.</li>
+<li>To derive a key, call <a class="reference internal" href="#c.psa_key_derivation_output_key" title="psa_key_derivation_output_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_output_key()</span></code></a>. To derive a byte string for a different purpose, call <a class="reference internal" href="#c.psa_key_derivation_output_bytes" title="psa_key_derivation_output_bytes"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_output_bytes()</span></code></a>. Successive calls to these functions use successive output bytes calculated by the key derivation algorithm.</li>
+<li>Clean up the key derivation operation object with <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a>.</li>
+</ol>
+<p>If this function returns an error, the key derivation operation object is not changed.</p>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_key_derivation_setup" title="psa_key_derivation_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a>.</p>
+<p>Implementations must reject an attempt to derive a key of size <code class="docutils literal"><span class="pre">0</span></code>.</p>
+</div>
+<div class="section" id="psa_key_derivation_get_capacity">
+<span id="c.psa_key_derivation_get_capacity"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_get_capacity</span></code> (function)</h3>
+<p>Retrieve the current capacity of a key derivation operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_get_capacity" title="psa_key_derivation_get_capacity">psa_key_derivation_get_capacity</a>(const <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                             size_t * capacity);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation to query.</dd>
+<dt> <code class="docutils literal"><span class="pre">capacity</span></code></dt>
+<dd>On success, the capacity of the operation.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The capacity of a key derivation is the maximum number of bytes that it can return. Reading <em>N</em> bytes of output from a key derivation operation reduces its capacity by at least <em>N</em>. The capacity can be reduced by more than <em>N</em> in the following situations:</p>
+<ul class="simple">
+<li>Calling <a class="reference internal" href="#c.psa_key_derivation_output_key" title="psa_key_derivation_output_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_output_key()</span></code></a> can reduce the capacity by more than the key size, depending on the type of key being generated. See  <a class="reference internal" href="#c.psa_key_derivation_output_key" title="psa_key_derivation_output_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_output_key()</span></code></a> for details of the key derivation process.</li>
+<li>When the <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code></a> object is operating as a deterministic random bit generator (DBRG), which reduces capacity in whole blocks, even when less than a block is read.</li>
+</ul>
+</div>
+<div class="section" id="psa_key_derivation_set_capacity">
+<span id="c.psa_key_derivation_set_capacity"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_set_capacity</span></code> (function)</h3>
+<p>Set the maximum capacity of a key derivation operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_set_capacity" title="psa_key_derivation_set_capacity">psa_key_derivation_set_capacity</a>(<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                             size_t capacity);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The key derivation operation object to modify.</dd>
+<dt> <code class="docutils literal"><span class="pre">capacity</span></code></dt>
+<dd>The new capacity of the operation. It must be less or equal to the operation’s current capacity.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">capacity</span></code> is larger than the operation’s current capacity. In this case, the operation object remains valid and its capacity remains unchanged.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The capacity of a key derivation operation is the maximum number of bytes that the key derivation operation can return from this point onwards.</p>
+</div>
+<div class="section" id="psa_key_derivation_input_bytes">
+<span id="c.psa_key_derivation_input_bytes"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_input_bytes</span></code> (function)</h3>
+<p>Provide an input for key derivation or key agreement.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_input_bytes" title="psa_key_derivation_input_bytes">psa_key_derivation_input_bytes</a>(<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                            <a class="reference internal" href="#c.psa_key_derivation_step_t" title="psa_key_derivation_step_t">psa_key_derivation_step_t</a> step,
+                                            const uint8_t * data,
+                                            size_t data_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The key derivation operation object to use. It must have been set up with <a class="reference internal" href="#c.psa_key_derivation_setup" title="psa_key_derivation_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_setup()</span></code></a> and must not have produced any output yet.</dd>
+<dt> <code class="docutils literal"><span class="pre">step</span></code></dt>
+<dd>Which step the input data is for.</dd>
+<dt> <code class="docutils literal"><span class="pre">data</span></code></dt>
+<dd>Input data to use.</dd>
+<dt> <code class="docutils literal"><span class="pre">data_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">data</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">step</span></code> is not compatible with the operation’s algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">step</span></code> does not allow direct inputs.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid for this input <code class="docutils literal"><span class="pre">step</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Which inputs are required and in what order depends on the algorithm. Refer to the documentation of each key derivation or key agreement algorithm for information.</p>
+<p>This function passes direct inputs, which is usually correct for non-secret inputs. To pass a secret input, which is normally in a key object, call <a class="reference internal" href="#c.psa_key_derivation_input_key" title="psa_key_derivation_input_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_input_key()</span></code></a> instead of this function. Refer to the documentation of individual step types (<code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_xxx</span></code> values of type <a class="reference internal" href="#c.psa_key_derivation_step_t" title="psa_key_derivation_step_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_key_derivation_step_t</span></code></a>) for more information.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_key_derivation_input_key">
+<span id="c.psa_key_derivation_input_key"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_input_key</span></code> (function)</h3>
+<p>Provide an input for key derivation in the form of a key.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_input_key" title="psa_key_derivation_input_key">psa_key_derivation_input_key</a>(<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                          <a class="reference internal" href="#c.psa_key_derivation_step_t" title="psa_key_derivation_step_t">psa_key_derivation_step_t</a> step,
+                                          <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The key derivation operation object to use. It must have been set up with <a class="reference internal" href="#c.psa_key_derivation_setup" title="psa_key_derivation_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_setup()</span></code></a> and must not have produced any output yet.</dd>
+<dt> <code class="docutils literal"><span class="pre">step</span></code></dt>
+<dd>Which step the input data is for.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key. It must have an appropriate type for <code class="docutils literal"><span class="pre">step</span></code> and must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DERIVE" title="PSA_KEY_USAGE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DERIVE</span></code></a>.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DERIVE" title="PSA_KEY_USAGE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DERIVE</span></code></a> flag.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">step</span></code> is not compatible with the operation’s algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">step</span></code> does not allow key inputs of the given type or does not allow key inputs at all.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid for this input <code class="docutils literal"><span class="pre">step</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Which inputs are required and in what order depends on the algorithm. Refer to the documentation of each key derivation or key agreement algorithm for information.</p>
+<p>This function obtains input from a key object, which is usually correct for secret inputs or for non-secret personalization strings kept in the key store. To pass a non-secret parameter which is not in the key store, call <a class="reference internal" href="#c.psa_key_derivation_input_bytes" title="psa_key_derivation_input_bytes"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_input_bytes()</span></code></a> instead of this function. Refer to the documentation of individual step types (<code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_xxx</span></code> values of type <a class="reference internal" href="#c.psa_key_derivation_step_t" title="psa_key_derivation_step_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_key_derivation_step_t</span></code></a>) for more information.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_key_derivation_output_bytes">
+<span id="c.psa_key_derivation_output_bytes"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_output_bytes</span></code> (function)</h3>
+<p>Read some data from a key derivation operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_output_bytes" title="psa_key_derivation_output_bytes">psa_key_derivation_output_bytes</a>(<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                             uint8_t * output,
+                                             size_t output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The key derivation operation object to read from.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the output will be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>Number of bytes to output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_DATA" title="PSA_ERROR_INSUFFICIENT_DATA"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_DATA</span></code></a></dt>
+<dd>The operation’s capacity was less than <code class="docutils literal"><span class="pre">output_length</span></code> bytes. Note that in this case, no output is written to the output buffer. The operation’s capacity is set to <code class="docutils literal"><span class="pre">0</span></code>, thus subsequent calls to this function will not succeed, even with a smaller output buffer.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active and completed all required input steps.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function calculates output bytes from a key derivation algorithm and return those bytes. If the key derivation’s output is viewed as a stream of bytes, this function consumes the requested number of bytes from the stream and returns them to the caller. The operation’s capacity decreases by the number of bytes read.</p>
+<p>If this function returns an error status other than <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_DATA" title="PSA_ERROR_INSUFFICIENT_DATA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_DATA</span></code></a>, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_key_derivation_output_key">
+<span id="c.psa_key_derivation_output_key"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_output_key</span></code> (function)</h3>
+<p>Derive a key from an ongoing key derivation operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_output_key" title="psa_key_derivation_output_key">psa_key_derivation_output_key</a>(const <a class="reference internal" href="../keys/attributes.html#c.psa_key_attributes_t" title="psa_key_attributes_t">psa_key_attributes_t</a> * attributes,
+                                           <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation,
+                                           <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> * key);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">attributes</span></code></dt>
+<dd>The attributes for the new key.</dd>
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The key derivation operation object to read from.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>On success, an identifier for the newly created key. <a class="reference internal" href="../keys/locations.html#c.PSA_KEY_ID_NULL" title="PSA_KEY_ID_NULL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_ID_NULL</span></code></a> on failure.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success. If the key is persistent, the key material and the key’s metadata have been saved to persistent storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_ALREADY_EXISTS" title="PSA_ERROR_ALREADY_EXISTS"><code class="docutils literal"><span class="pre">PSA_ERROR_ALREADY_EXISTS</span></code></a></dt>
+<dd>This is an attempt to create a persistent key, and there is already a persistent key with the given identifier.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_DATA" title="PSA_ERROR_INSUFFICIENT_DATA"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_DATA</span></code></a></dt>
+<dd>There was not enough data to create the desired key. Note that in this case, no output is written to the output buffer. The operation’s capacity is set to <code class="docutils literal"><span class="pre">0</span></code>, thus subsequent calls to this function will not succeed, even with a smaller output buffer.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd>The key type or key size is not supported, either by the implementation in general or in this particular location.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd>The provided key attributes are not valid for the operation.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SECRET" title="PSA_KEY_DERIVATION_INPUT_SECRET"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code></a> input was not provided through a key.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active and completed all required input steps.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_STORAGE" title="PSA_ERROR_INSUFFICIENT_STORAGE"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_STORAGE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function calculates output bytes from a key derivation algorithm and uses those bytes to generate a key deterministically. The key’s location, usage policy, type and size are taken from <code class="docutils literal"><span class="pre">attributes</span></code>.</p>
+<p>If the key derivation’s output is viewed as a stream of bytes, this function consumes the required number of bytes from the stream. The operation’s capacity decreases by the number of bytes used to derive the key.</p>
+<p>If this function returns an error status other than <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_DATA" title="PSA_ERROR_INSUFFICIENT_DATA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_DATA</span></code></a>, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a>.</p>
+<p>How much output is produced and consumed from the operation, and how the key is derived, depends on the key type:</p>
+<ul>
+<li><p class="first">For key types for which the key is an arbitrary sequence of bytes of a given size, this function is functionally equivalent to calling <a class="reference internal" href="#c.psa_key_derivation_output_bytes" title="psa_key_derivation_output_bytes"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_output_bytes()</span></code></a> and passing the resulting output to <a class="reference internal" href="../keys/management.html#c.psa_import_key" title="psa_import_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_import_key()</span></code></a>. However, this function has a security benefit: if the implementation provides an isolation boundary then the key material is not exposed outside the isolation boundary. As a consequence, for these key types, this function always consumes exactly <code class="docutils literal"><span class="pre">(bits/8)</span></code> bytes from the operation. The following key types defined in this specification follow this scheme:</p>
+<ul class="simple">
+<li><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_AES" title="PSA_KEY_TYPE_AES"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_AES</span></code></a>;</li>
+<li><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_ARC4" title="PSA_KEY_TYPE_ARC4"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_ARC4</span></code></a>;</li>
+<li><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_CAMELLIA" title="PSA_KEY_TYPE_CAMELLIA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_CAMELLIA</span></code></a>;</li>
+<li><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_DERIVE" title="PSA_KEY_TYPE_DERIVE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_DERIVE</span></code></a>;</li>
+<li><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_HMAC" title="PSA_KEY_TYPE_HMAC"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_HMAC</span></code></a>.</li>
+</ul>
+</li>
+<li><p class="first">For ECC keys on a Montgomery elliptic curve (<a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_ECC_KEY_PAIR" title="PSA_KEY_TYPE_ECC_KEY_PAIR"><code class="docutils literal"><span class="pre">PSA_KEY_TYPE_ECC_KEY_PAIR</span></code></a><code class="docutils literal"><span class="pre">(</span></code><a class="reference internal" href="../keys/types.html#c.PSA_ECC_FAMILY_MONTGOMERY" title="PSA_ECC_FAMILY_MONTGOMERY"><code class="docutils literal"><span class="pre">PSA_ECC_FAMILY_MONTGOMERY</span></code></a><code class="docutils literal"><span class="pre">)</span></code>), this function always draws a byte string whose length is determined by the curve, and sets the mandatory bits accordingly. That is:</p>
+<ul class="simple">
+<li>Curve25519 (<a class="reference internal" href="../keys/types.html#c.PSA_ECC_FAMILY_MONTGOMERY" title="PSA_ECC_FAMILY_MONTGOMERY"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ECC_FAMILY_MONTGOMERY</span></code></a>, 255 bits): draw a 32-byte string and process it as specified in <a class="reference external" href="https://tools.ietf.org/html/rfc7748.html#section-5">RFC 7748 §5</a>.</li>
+<li>Curve448 (<a class="reference internal" href="../keys/types.html#c.PSA_ECC_FAMILY_MONTGOMERY" title="PSA_ECC_FAMILY_MONTGOMERY"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ECC_FAMILY_MONTGOMERY</span></code></a>, 448 bits): draw a 56-byte string and process it as specified in <a class="reference external" href="https://tools.ietf.org/html/rfc7748.html#section-5">RFC 7748 §5</a>.</li>
+</ul>
+</li>
+<li><p class="first">For key types for which the key is represented by a single sequence of <code class="docutils literal"><span class="pre">bits</span></code> bits with constraints as to which bit sequences are acceptable, this function draws a byte string of length <code class="docutils literal"><span class="pre">ceiling(bits/8)</span></code> bytes. If the resulting byte string is acceptable, it becomes the key, otherwise the drawn bytes are discarded. This process is repeated until an acceptable byte string is drawn. The byte string drawn from the operation is interpreted as specified for the output produced by <a class="reference internal" href="../keys/management.html#c.psa_export_key" title="psa_export_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_export_key()</span></code></a>. The following key types defined in this specification follow this scheme:</p>
+<ul>
+<li><p class="first"><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_DES" title="PSA_KEY_TYPE_DES"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_DES</span></code></a>. Force-set the parity bits, but discard forbidden weak keys. For 2-key and 3-key triple-DES, the three keys are generated successively. For example, for 3-key triple-DES, if the first 8 bytes specify a weak key and the next 8 bytes do not, discard the first 8 bytes, use the next 8 bytes as the first key, and continue reading output from the operation to derive the other two keys.</p>
+</li>
+<li><p class="first">Finite-field Diffie-Hellman keys (<a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_DH_KEY_PAIR" title="PSA_KEY_TYPE_DH_KEY_PAIR"><code class="docutils literal"><span class="pre">PSA_KEY_TYPE_DH_KEY_PAIR</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">dh_family</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">dh_family</span></code> designates any Diffie-Hellman family) and ECC keys on a Weierstrass elliptic curve (<a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_ECC_KEY_PAIR" title="PSA_KEY_TYPE_ECC_KEY_PAIR"><code class="docutils literal"><span class="pre">PSA_KEY_TYPE_ECC_KEY_PAIR</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">ecc_family</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">ecc_family</span></code> designates a Weierstrass curve family). For these key types, interpret the byte string as integer in big-endian order. Discard it if it is not in the range [0, <em>N</em> - 2] where <em>N</em> is the boundary of the private key domain: <em>N</em> is the prime <em>p</em> for Diffie-Hellman, or the order of the curve’s base point for ECC. Add <code class="docutils literal"><span class="pre">1</span></code> to the resulting integer and use this as the private key <em>x</em>.</p>
+<p>This method allows compliance to NIST standards, specifically the methods titled <em>Key-Pair Generation by Testing Candidates</em> in the following publications:</p>
+<ul class="simple">
+<li><a class="reference external" href="https://doi.org/10.6028/NIST.SP.800-56Ar3"><em>NIST Special Publication 800-56A: Recommendation for Pair-Wise Key-Establishment Schemes Using Discrete Logarithm Cryptography</em></a> (NIST SP 800-56A) §5.6.1.1.4 for Diffie-Hellman keys.</li>
+<li><a class="reference external" href="https://doi.org/10.6028/NIST.SP.800-56Ar3">NIST SP 800-56A</a> §5.6.1.2.2 or <a class="reference external" href="https://doi.org/10.6028/NIST.FIPS.186-4"><em>FIPS Publication 186-4: Digital Signature Standard (DSS)</em></a> (FIPS 186-4) §B.4.2 for elliptic curve keys.</li>
+</ul>
+</li>
+</ul>
+</li>
+<li><p class="first">For other key types, including <a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RSA_KEY_PAIR" title="PSA_KEY_TYPE_RSA_KEY_PAIR"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RSA_KEY_PAIR</span></code></a>, the way in which the operation output is consumed is implementation-defined.</p>
+</li>
+</ul>
+<p>In all cases, the data that is read is discarded from the operation. The operation’s capacity is decreased by the number of bytes read.</p>
+<p>For algorithms that take an input step <a class="reference internal" href="#c.PSA_KEY_DERIVATION_INPUT_SECRET" title="PSA_KEY_DERIVATION_INPUT_SECRET"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code></a>, the input to that step must be provided with <a class="reference internal" href="#c.psa_key_derivation_input_key" title="psa_key_derivation_input_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_input_key()</span></code></a>. Future versions of this specification might include additional restrictions on the derived key based on the attributes and strength of the secret key.</p>
+</div>
+<div class="section" id="psa_key_derivation_abort">
+<span id="c.psa_key_derivation_abort"></span><h3><code class="docutils literal"><span class="pre">psa_key_derivation_abort</span></code> (function)</h3>
+<p>Abort a key derivation operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort">psa_key_derivation_abort</a>(<a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t">psa_key_derivation_operation_t</a> * operation);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation to abort.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Aborting an operation frees all associated resources except for the <code class="docutils literal"><span class="pre">operation</span></code> object itself. Once aborted, the operation object can be reused for another operation by calling <a class="reference internal" href="#c.psa_key_derivation_setup" title="psa_key_derivation_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_setup()</span></code></a> again.</p>
+<p>This function can be called at any time after the operation object has been initialized as described in <a class="reference internal" href="#c.psa_key_derivation_operation_t" title="psa_key_derivation_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code></a>.</p>
+<p>In particular, it is valid to call <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a> twice, or to call <a class="reference internal" href="#c.psa_key_derivation_abort" title="psa_key_derivation_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_key_derivation_abort()</span></code></a> on an operation that has not been set up.</p>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_ALG_IS_HKDF">
+<span id="c.PSA_ALG_IS_HKDF"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_HKDF</span></code> (macro)</h3>
+<p>Whether the specified algorithm is an HKDF algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_HKDF" title="PSA_ALG_IS_HKDF">PSA_ALG_IS_HKDF</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an HKDF algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported key derivation algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>HKDF is a family of key derivation algorithms that are based on a hash function and the HMAC construction.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_TLS12_PRF">
+<span id="c.PSA_ALG_IS_TLS12_PRF"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_TLS12_PRF</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a TLS-1.2 PRF algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_TLS12_PRF" title="PSA_ALG_IS_TLS12_PRF">PSA_ALG_IS_TLS12_PRF</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a TLS-1.2 PRF algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported key derivation algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_TLS12_PSK_TO_MS">
+<span id="c.PSA_ALG_IS_TLS12_PSK_TO_MS"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_TLS12_PSK_TO_MS</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a TLS-1.2 PSK to MS algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_TLS12_PSK_TO_MS" title="PSA_ALG_IS_TLS12_PSK_TO_MS">PSA_ALG_IS_TLS12_PSK_TO_MS</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a TLS-1.2 PSK to MS algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported key derivation algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_KEY_DERIVATION_UNLIMITED_CAPACITY">
+<span id="c.PSA_KEY_DERIVATION_UNLIMITED_CAPACITY"></span><h3><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_UNLIMITED_CAPACITY</span></code> (macro)</h3>
+<p>Use the maximum possible capacity for a key derivation operation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_KEY_DERIVATION_UNLIMITED_CAPACITY" title="PSA_KEY_DERIVATION_UNLIMITED_CAPACITY">PSA_KEY_DERIVATION_UNLIMITED_CAPACITY</a> \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>Use this value as the capacity argument when setting up a key derivation to specify that the operation will use the maximum possible capacity. The value of the maximum possible capacity depends on the key derivation algorithm.</p>
+</div>
+<div class="section" id="PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE">
+<span id="c.PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE</span></code> (macro)</h3>
+<p>This macro returns the maximum supported length of the PSK for the TLS-1.2 PSK-to-MS key derivation.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE" title="PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE">PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This implementation-defined value specifies the maximum length for the PSK input used with a <a class="reference internal" href="#c.PSA_ALG_TLS12_PSK_TO_MS" title="PSA_ALG_TLS12_PSK_TO_MS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_TLS12_PSK_TO_MS()</span></code></a> key agreement algorithm.</p>
+<p>Quoting <a class="reference external" href="https://tools.ietf.org/html/rfc4279.html#section-5.3">RFC 4279 §5.3</a>:</p>
+<blockquote>
+<div>TLS implementations supporting these ciphersuites MUST support arbitrary PSK identities up to 128 octets in length, and arbitrary PSKs up to 64 octets in length. Supporting longer identities and keys is RECOMMENDED.</div></blockquote>
+<p>Therefore, it is recommended that implementations define <a class="reference internal" href="#c.PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE" title="PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE</span></code></a> with a value greater than or equal to <code class="docutils literal"><span class="pre">64</span></code>.</p>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Key derivation</a><ul>
+<li><a class="reference internal" href="#key-derivation-algorithms">Key derivation algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_HKDF"><code class="docutils literal"><span class="pre">PSA_ALG_HKDF</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_TLS12_PRF"><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PRF</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_TLS12_PSK_TO_MS"><code class="docutils literal"><span class="pre">PSA_ALG_TLS12_PSK_TO_MS</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#input-step-types">Input step types</a><ul>
+<li><a class="reference internal" href="#psa_key_derivation_step_t"><code class="docutils literal"><span class="pre">psa_key_derivation_step_t</span></code> (type)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_INPUT_SECRET"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SECRET</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_INPUT_LABEL"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_LABEL</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_INPUT_CONTEXT"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_CONTEXT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_INPUT_SALT"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SALT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_INPUT_INFO"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_INFO</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_INPUT_SEED"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_INPUT_SEED</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#key-derivation-functions">Key derivation functions</a><ul>
+<li><a class="reference internal" href="#psa_key_derivation_operation_t"><code class="docutils literal"><span class="pre">psa_key_derivation_operation_t</span></code> (type)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_OPERATION_INIT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_operation_init"><code class="docutils literal"><span class="pre">psa_key_derivation_operation_init</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_setup"><code class="docutils literal"><span class="pre">psa_key_derivation_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_get_capacity"><code class="docutils literal"><span class="pre">psa_key_derivation_get_capacity</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_set_capacity"><code class="docutils literal"><span class="pre">psa_key_derivation_set_capacity</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_input_bytes"><code class="docutils literal"><span class="pre">psa_key_derivation_input_bytes</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_input_key"><code class="docutils literal"><span class="pre">psa_key_derivation_input_key</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_output_bytes"><code class="docutils literal"><span class="pre">psa_key_derivation_output_bytes</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_output_key"><code class="docutils literal"><span class="pre">psa_key_derivation_output_key</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_key_derivation_abort"><code class="docutils literal"><span class="pre">psa_key_derivation_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_IS_HKDF"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HKDF</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_TLS12_PRF"><code class="docutils literal"><span class="pre">PSA_ALG_IS_TLS12_PRF</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_TLS12_PSK_TO_MS"><code class="docutils literal"><span class="pre">PSA_ALG_IS_TLS12_PSK_TO_MS</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_KEY_DERIVATION_UNLIMITED_CAPACITY"><code class="docutils literal"><span class="pre">PSA_KEY_DERIVATION_UNLIMITED_CAPACITY</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="relations">
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+  <div class="section" id="message-authentication-codes-mac">
+<span id="macs"></span><h1>Message authentication codes (MAC)</h1>
+<div class="section" id="mac-algorithms">
+<span id="id1"></span><h2>MAC algorithms</h2>
+<div class="section" id="PSA_ALG_HMAC">
+<span id="c.PSA_ALG_HMAC"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_HMAC</span></code> (macro)</h3>
+<p>Macro to build an HMAC algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_HMAC" title="PSA_ALG_HMAC">PSA_ALG_HMAC</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding HMAC algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>For example, <a class="reference internal" href="#c.PSA_ALG_HMAC" title="PSA_ALG_HMAC"><code class="docutils literal"><span class="pre">PSA_ALG_HMAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><a class="reference internal" href="hashes.html#c.PSA_ALG_SHA_256" title="PSA_ALG_SHA_256"><code class="docutils literal"><span class="pre">PSA_ALG_SHA_256</span></code></a><code class="docutils literal"><span class="pre">)</span></code> is HMAC-SHA-256.</p>
+</div>
+<div class="section" id="PSA_ALG_TRUNCATED_MAC">
+<span id="c.PSA_ALG_TRUNCATED_MAC"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_TRUNCATED_MAC</span></code> (macro)</h3>
+<p>Macro to build a truncated MAC algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_TRUNCATED_MAC" title="PSA_ALG_TRUNCATED_MAC">PSA_ALG_TRUNCATED_MAC</a>(mac_alg, mac_length) \
+    <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">mac_alg</span></code></dt>
+<dd>A MAC algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a> such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_MAC" title="PSA_ALG_IS_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_MAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true). This can be a truncated or untruncated MAC algorithm.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac_length</span></code></dt>
+<dd>Desired length of the truncated MAC in bytes. This must be at most the full length of the MAC and must be at least an implementation-specified minimum. The implementation-specified minimum must not be zero.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding MAC algorithm with the specified length.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported MAC algorithm or if <code class="docutils literal"><span class="pre">mac_length</span></code> is too small or too large for the specified MAC algorithm.</p>
+<p class="rubric">Description</p>
+<p>A truncated MAC algorithm is identical to the corresponding MAC algorithm except that the MAC value for the truncated algorithm consists of only the first <code class="docutils literal"><span class="pre">mac_length</span></code> bytes of the MAC value for the untruncated algorithm.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">This macro might allow constructing algorithm identifiers that are not valid, either because the specified length is larger than the untruncated MAC or because the specified length is smaller than permitted by the implementation.</p>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">It is implementation-defined whether a truncated MAC that is truncated to the same length as the MAC of the untruncated algorithm is considered identical to the untruncated algorithm for policy comparison purposes.</p>
+</div>
+<p>The full-length MAC algorithm can be recovered using <a class="reference internal" href="#c.PSA_ALG_FULL_LENGTH_MAC" title="PSA_ALG_FULL_LENGTH_MAC"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_FULL_LENGTH_MAC()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_CBC_MAC">
+<span id="c.PSA_ALG_CBC_MAC"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CBC_MAC</span></code> (macro)</h3>
+<p>The CBC-MAC construction over a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CBC_MAC" title="PSA_ALG_CBC_MAC">PSA_ALG_CBC_MAC</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x03c00100)
+</pre>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">CBC-MAC is insecure in many cases. A more secure mode, such as <a class="reference internal" href="#c.PSA_ALG_CMAC" title="PSA_ALG_CMAC"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_CMAC</span></code></a>, is recommended.</p>
+</div>
+</div>
+<div class="section" id="PSA_ALG_CMAC">
+<span id="c.PSA_ALG_CMAC"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CMAC</span></code> (macro)</h3>
+<p>The CMAC construction over a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_CMAC" title="PSA_ALG_CMAC">PSA_ALG_CMAC</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x03c00200)
+</pre>
+</div>
+</div>
+<div class="section" id="single-part-mac-functions">
+<h2>Single-part MAC functions</h2>
+<div class="section" id="psa_mac_compute">
+<span id="c.psa_mac_compute"></span><h3><code class="docutils literal"><span class="pre">psa_mac_compute</span></code> (function)</h3>
+<p>Calculate the message authentication code (MAC) of a message.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_compute" title="psa_mac_compute">psa_mac_compute</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                             <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                             const uint8_t * input,
+                             size_t input_length,
+                             uint8_t * mac,
+                             size_t mac_size,
+                             size_t * mac_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_MESSAGE" title="PSA_KEY_USAGE_SIGN_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_MESSAGE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The MAC algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_MAC" title="PSA_ALG_IS_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_MAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the input message.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac</span></code></dt>
+<dd>Buffer where the MAC value is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">mac</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>The exact MAC size is <a class="reference internal" href="#c.PSA_MAC_LENGTH" title="PSA_MAC_LENGTH"><code class="docutils literal"><span class="pre">PSA_MAC_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are attributes of the key used to compute the MAC.</li>
+<li><a class="reference internal" href="#c.PSA_MAC_MAX_SIZE" title="PSA_MAC_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code></a> evaluates to the maximum MAC size of any supported MAC algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">mac_length</span></code></dt>
+<dd>On success, the number of bytes that make up the MAC value.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_MESSAGE" title="PSA_KEY_USAGE_SIGN_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_MESSAGE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a MAC algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">mac</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_MAC_LENGTH" title="PSA_MAC_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_LENGTH()</span></code></a> or <a class="reference internal" href="#c.PSA_MAC_MAX_SIZE" title="PSA_MAC_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">To verify the MAC of a message against an expected value, use <a class="reference internal" href="#c.psa_mac_verify" title="psa_mac_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify()</span></code></a> instead. Beware that comparing integrity or authenticity data such as MAC values with a function such as <code class="docutils literal"><span class="pre">memcmp()</span></code> is risky because the time taken by the comparison might leak information about the MAC value which could allow an attacker to guess a valid MAC and thereby bypass security controls.</p>
+</div>
+</div>
+<div class="section" id="psa_mac_verify">
+<span id="c.psa_mac_verify"></span><h3><code class="docutils literal"><span class="pre">psa_mac_verify</span></code> (function)</h3>
+<p>Calculate the MAC of a message and compare it with a reference value.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_verify" title="psa_mac_verify">psa_mac_verify</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                            <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                            const uint8_t * input,
+                            size_t input_length,
+                            const uint8_t * mac,
+                            size_t mac_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_MESSAGE" title="PSA_KEY_USAGE_VERIFY_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_MESSAGE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The MAC algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_MAC" title="PSA_ALG_IS_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_MAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the input message.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac</span></code></dt>
+<dd>Buffer containing the expected MAC value.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">mac</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>The expected MAC is identical to the actual MAC of the input.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The MAC of the message was calculated successfully, but it differs from the expected value.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_MESSAGE" title="PSA_KEY_USAGE_VERIFY_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_MESSAGE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a MAC algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+</div>
+</div>
+<div class="section" id="multi-part-mac-operations">
+<h2>Multi-part MAC operations</h2>
+<div class="section" id="psa_mac_operation_t">
+<span id="c.psa_mac_operation_t"></span><h3><code class="docutils literal"><span class="pre">psa_mac_operation_t</span></code> (type)</h3>
+<p>The type of the state object for multi-part MAC operations.</p>
+<pre class="literal-block">
+typedef <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-type"><span class="std std-ref">/* implementation-defined type */</span></a></em> <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a>;
+</pre>
+<p>Before calling any function on a MAC operation object, the application must initialize it by any of the following means:</p>
+<ul>
+<li><p class="first">Set the object to all-bits-zero, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> operation;
+memset(&amp;operation, 0, sizeof(operation));
+</pre>
+</li>
+<li><p class="first">Initialize the object to logical zero values by declaring the object as static or global without an explicit initializer, for example:</p>
+<pre class="literal-block">
+static <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> operation;
+</pre>
+</li>
+<li><p class="first">Initialize the object to the initializer <a class="reference internal" href="#c.PSA_MAC_OPERATION_INIT" title="PSA_MAC_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_OPERATION_INIT</span></code></a>, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> operation = <a class="reference internal" href="#c.PSA_MAC_OPERATION_INIT" title="PSA_MAC_OPERATION_INIT">PSA_MAC_OPERATION_INIT</a>;
+</pre>
+</li>
+<li><p class="first">Assign the result of the function <a class="reference internal" href="#c.psa_mac_operation_init" title="psa_mac_operation_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_operation_init()</span></code></a> to the object, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> operation;
+operation = <a class="reference internal" href="#c.psa_mac_operation_init" title="psa_mac_operation_init">psa_mac_operation_init</a>();
+</pre>
+</li>
+</ul>
+<p>This is an implementation-defined type. Applications that make assumptions about the content of this object will result in in implementation-specific behavior, and are non-portable.</p>
+</div>
+<div class="section" id="PSA_MAC_OPERATION_INIT">
+<span id="c.PSA_MAC_OPERATION_INIT"></span><h3><code class="docutils literal"><span class="pre">PSA_MAC_OPERATION_INIT</span></code> (macro)</h3>
+<p>This macro returns a suitable initializer for a MAC operation object of type <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_mac_operation_t</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_MAC_OPERATION_INIT" title="PSA_MAC_OPERATION_INIT">PSA_MAC_OPERATION_INIT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+</div>
+<div class="section" id="psa_mac_operation_init">
+<span id="c.psa_mac_operation_init"></span><h3><code class="docutils literal"><span class="pre">psa_mac_operation_init</span></code> (function)</h3>
+<p>Return an initial value for a MAC operation object.</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> <a class="reference internal" href="#c.psa_mac_operation_init" title="psa_mac_operation_init">psa_mac_operation_init</a>(void);
+</pre>
+<p class="rubric">Returns: <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t"><code class="docutils literal"><span class="pre">psa_mac_operation_t</span></code></a></p>
+</div>
+<div class="section" id="psa_mac_sign_setup">
+<span id="c.psa_mac_sign_setup"></span><h3><code class="docutils literal"><span class="pre">psa_mac_sign_setup</span></code> (function)</h3>
+<p>Set up a multi-part MAC calculation operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_sign_setup" title="psa_mac_sign_setup">psa_mac_sign_setup</a>(<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> * operation,
+                                <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_mac_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_MESSAGE" title="PSA_KEY_USAGE_SIGN_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_MESSAGE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The MAC algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_MAC" title="PSA_ALG_IS_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_MAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_MESSAGE" title="PSA_KEY_USAGE_SIGN_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_MESSAGE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a MAC algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function sets up the calculation of the message authentication code (MAC) of a byte string. To verify the MAC of a message against an expected value, use <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_setup()</span></code></a> instead.</p>
+<p>The sequence of operations to calculate a MAC is as follows:</p>
+<ol class="arabic simple">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_mac_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_MAC_OPERATION_INIT" title="PSA_MAC_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_OPERATION_INIT</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_mac_sign_setup" title="psa_mac_sign_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_setup()</span></code></a> to specify the algorithm and key.</li>
+<li>Call <a class="reference internal" href="#c.psa_mac_update" title="psa_mac_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_update()</span></code></a> zero, one or more times, passing a fragment of the message each time. The MAC that is calculated is the MAC of the concatenation of these messages in order.</li>
+<li>At the end of the message, call <a class="reference internal" href="#c.psa_mac_sign_finish" title="psa_mac_sign_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_finish()</span></code></a> to finish calculating the MAC value and retrieve it.</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_mac_sign_setup" title="psa_mac_sign_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a> at any time after the operation has been initialized.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_mac_sign_setup" title="psa_mac_sign_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_setup()</span></code></a>, the application must eventually terminate the operation through one of the following methods:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_mac_sign_finish" title="psa_mac_sign_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_finish()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_mac_verify_setup">
+<span id="c.psa_mac_verify_setup"></span><h3><code class="docutils literal"><span class="pre">psa_mac_verify_setup</span></code> (function)</h3>
+<p>Set up a multi-part MAC verification operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup">psa_mac_verify_setup</a>(<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> * operation,
+                                  <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                  <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_mac_operation_t</span></code></a> and not yet in use.</dd>
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_MESSAGE" title="PSA_KEY_USAGE_VERIFY_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_MESSAGE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The MAC algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_MAC" title="PSA_ALG_IS_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_MAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_MESSAGE" title="PSA_KEY_USAGE_VERIFY_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_MESSAGE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not a MAC algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd>The key could not be retrieved from storage</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd>The key could not be retrieved from storage.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be inactive.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>This function sets up the verification of the message authentication code (MAC) of a byte string against an expected value.</p>
+<p>The sequence of operations to verify a MAC is as follows:</p>
+<ol class="arabic simple">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_mac_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_MAC_OPERATION_INIT" title="PSA_MAC_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_OPERATION_INIT</span></code></a>.</li>
+<li>Call <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_setup()</span></code></a> to specify the algorithm and key.</li>
+<li>Call <a class="reference internal" href="#c.psa_mac_update" title="psa_mac_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_update()</span></code></a> zero, one or more times, passing a fragment of the message each time. The MAC that is calculated is the MAC of the concatenation of these messages in order.</li>
+<li>At the end of the message, call <a class="reference internal" href="#c.psa_mac_verify_finish" title="psa_mac_verify_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_finish()</span></code></a> to finish calculating the actual MAC of the message and verify it against the expected value.</li>
+</ol>
+<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a> at any time after the operation has been initialized.</p>
+<p>After a successful call to <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_setup()</span></code></a>, the application must eventually terminate the operation through one of the following methods:</p>
+<ul class="simple">
+<li>A successful call to <a class="reference internal" href="#c.psa_mac_verify_finish" title="psa_mac_verify_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_finish()</span></code></a>.</li>
+<li>A call to <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>.</li>
+</ul>
+</div>
+<div class="section" id="psa_mac_update">
+<span id="c.psa_mac_update"></span><h3><code class="docutils literal"><span class="pre">psa_mac_update</span></code> (function)</h3>
+<p>Add a message fragment to a multi-part MAC operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_update" title="psa_mac_update">psa_mac_update</a>(<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> * operation,
+                            const uint8_t * input,
+                            size_t input_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active MAC operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>Buffer containing the message fragment to add to the MAC calculation.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be active.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_mac_sign_setup" title="psa_mac_sign_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_setup()</span></code></a> or <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_setup()</span></code></a> before calling this function.</p>
+<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>.</p>
+</div>
+<div class="section" id="psa_mac_sign_finish">
+<span id="c.psa_mac_sign_finish"></span><h3><code class="docutils literal"><span class="pre">psa_mac_sign_finish</span></code> (function)</h3>
+<p>Finish the calculation of the MAC of a message.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_sign_finish" title="psa_mac_sign_finish">psa_mac_sign_finish</a>(<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> * operation,
+                                 uint8_t * mac,
+                                 size_t mac_size,
+                                 size_t * mac_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active MAC operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac</span></code></dt>
+<dd>Buffer where the MAC value is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">mac</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>The exact MAC size is <a class="reference internal" href="#c.PSA_MAC_LENGTH" title="PSA_MAC_LENGTH"><code class="docutils literal"><span class="pre">PSA_MAC_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are attributes of the key, and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm used to compute the MAC.</li>
+<li><a class="reference internal" href="#c.PSA_MAC_MAX_SIZE" title="PSA_MAC_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code></a> evaluates to the maximum MAC size of any supported MAC algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">mac_length</span></code></dt>
+<dd>On success, the number of bytes that make up the MAC value. This is always <code class="docutils literal"><span class="pre">PSA_MAC_FINAL_SIZE</span></code><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are the type and bit-size respectively of the key and <code class="docutils literal"><span class="pre">alg</span></code> is the MAC algorithm that is calculated.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>Success.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be an active mac sign operation.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">mac</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_MAC_LENGTH" title="PSA_MAC_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_LENGTH()</span></code></a> or <a class="reference internal" href="#c.PSA_MAC_MAX_SIZE" title="PSA_MAC_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_mac_sign_setup" title="psa_mac_sign_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_setup()</span></code></a> before calling this function. This function calculates the MAC of the message formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_mac_update" title="psa_mac_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_update()</span></code></a>.</p>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>.</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p>It is not recommended to use this function when a specific value is expected for the MAC. Call <a class="reference internal" href="#c.psa_mac_verify_finish" title="psa_mac_verify_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_finish()</span></code></a> instead with the expected MAC value.</p>
+<p class="last">Comparing integrity or authenticity data such as MAC values with a function such as <code class="docutils literal"><span class="pre">memcmp()</span></code> is risky because the time taken by the comparison might leak information about the hashed data which could allow an attacker to guess a valid MAC and thereby bypass security controls.</p>
+</div>
+</div>
+<div class="section" id="psa_mac_verify_finish">
+<span id="c.psa_mac_verify_finish"></span><h3><code class="docutils literal"><span class="pre">psa_mac_verify_finish</span></code> (function)</h3>
+<p>Finish the calculation of the MAC of a message and compare it with an expected value.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_verify_finish" title="psa_mac_verify_finish">psa_mac_verify_finish</a>(<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> * operation,
+                                   const uint8_t * mac,
+                                   size_t mac_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Active MAC operation.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac</span></code></dt>
+<dd>Buffer containing the expected MAC value.</dd>
+<dt> <code class="docutils literal"><span class="pre">mac_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">mac</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>The expected MAC is identical to the actual MAC of the message.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The MAC of the message was calculated successfully, but it differs from the expected MAC.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The operation state is not valid: it must be an active mac verify operation.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>The application must call <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_setup()</span></code></a> before calling this function. This function calculates the MAC of the message formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_mac_update" title="psa_mac_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_update()</span></code></a>. It then compares the calculated MAC with the expected MAC passed as a parameter to this function.</p>
+<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Implementations must make the best effort to ensure that the comparison between the actual MAC and the expected MAC is performed in constant time.</p>
+</div>
+</div>
+<div class="section" id="psa_mac_abort">
+<span id="c.psa_mac_abort"></span><h3><code class="docutils literal"><span class="pre">psa_mac_abort</span></code> (function)</h3>
+<p>Abort a MAC operation.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort">psa_mac_abort</a>(<a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t">psa_mac_operation_t</a> * operation);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
+<dd>Initialized MAC operation.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>Aborting an operation frees all associated resources except for the <code class="docutils literal"><span class="pre">operation</span></code> object itself. Once aborted, the operation object can be reused for another operation by calling <a class="reference internal" href="#c.psa_mac_sign_setup" title="psa_mac_sign_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_setup()</span></code></a> or <a class="reference internal" href="#c.psa_mac_verify_setup" title="psa_mac_verify_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_setup()</span></code></a> again.</p>
+<p>This function can be called any time after the operation object has been initialized by one of the methods described in <a class="reference internal" href="#c.psa_mac_operation_t" title="psa_mac_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_mac_operation_t</span></code></a>.</p>
+<p>In particular, calling <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a> after the operation has been terminated by a call to <a class="reference internal" href="#c.psa_mac_abort" title="psa_mac_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_abort()</span></code></a>, <a class="reference internal" href="#c.psa_mac_sign_finish" title="psa_mac_sign_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_finish()</span></code></a> or <a class="reference internal" href="#c.psa_mac_verify_finish" title="psa_mac_verify_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_finish()</span></code></a> is safe and has no effect.</p>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_ALG_IS_HMAC">
+<span id="c.PSA_ALG_IS_HMAC"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_HMAC</span></code> (macro)</h3>
+<p>Whether the specified algorithm is an HMAC algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_HMAC" title="PSA_ALG_IS_HMAC">PSA_ALG_IS_HMAC</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an HMAC algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>HMAC is a family of MAC algorithms that are based on a hash function.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_BLOCK_CIPHER_MAC">
+<span id="c.PSA_ALG_IS_BLOCK_CIPHER_MAC"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_BLOCK_CIPHER_MAC</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a MAC algorithm based on a block cipher.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_BLOCK_CIPHER_MAC" title="PSA_ALG_IS_BLOCK_CIPHER_MAC">PSA_ALG_IS_BLOCK_CIPHER_MAC</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a MAC algorithm based on a block cipher, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_FULL_LENGTH_MAC">
+<span id="c.PSA_ALG_FULL_LENGTH_MAC"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_FULL_LENGTH_MAC</span></code> (macro)</h3>
+<p>Macro to construct the MAC algorithm with a full length MAC, from a truncated MAC algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_FULL_LENGTH_MAC" title="PSA_ALG_FULL_LENGTH_MAC">PSA_ALG_FULL_LENGTH_MAC</a>(mac_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">mac_alg</span></code></dt>
+<dd>A MAC algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a> such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_MAC" title="PSA_ALG_IS_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_MAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true). This can be a truncated or untruncated MAC algorithm.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding MAC algorithm with a full length MAC.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported MAC algorithm.</p>
+</div>
+<div class="section" id="PSA_MAC_LENGTH">
+<span id="c.PSA_MAC_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_MAC_LENGTH</span></code> (macro)</h3>
+<p>The size of the output of <a class="reference internal" href="#c.psa_mac_compute" title="psa_mac_compute"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_compute()</span></code></a> and <a class="reference internal" href="#c.psa_mac_sign_finish" title="psa_mac_sign_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_sign_finish()</span></code></a>, in bytes.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_MAC_LENGTH" title="PSA_MAC_LENGTH">PSA_MAC_LENGTH</a>(key_type, key_bits, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>The type of the MAC key.</dd>
+<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
+<dd>The size of the MAC key in bits.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>A MAC algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_MAC" title="PSA_ALG_IS_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_MAC</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The MAC length for the specified algorithm with the specified key parameters.</p>
+<p><code class="docutils literal"><span class="pre">0</span></code> if the MAC algorithm is not recognized.</p>
+<p>Either <code class="docutils literal"><span class="pre">0</span></code> or the correct length for a MAC algorithm that the implementation recognizes, but does not support.</p>
+<p>Unspecified if the key parameters are not consistent with the algorithm.</p>
+<p class="rubric">Description</p>
+<p>This is also the MAC length that <a class="reference internal" href="#c.psa_mac_verify" title="psa_mac_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify()</span></code></a> and <a class="reference internal" href="#c.psa_mac_verify_finish" title="psa_mac_verify_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_mac_verify_finish()</span></code></a> expects.</p>
+<p>See also <a class="reference internal" href="#c.PSA_MAC_MAX_SIZE" title="PSA_MAC_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_MAC_MAX_SIZE">
+<span id="c.PSA_MAC_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code> (macro)</h3>
+<p>Maximum size of a MAC.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_MAC_MAX_SIZE" title="PSA_MAC_MAX_SIZE">PSA_MAC_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This macro must expand to a compile-time constant integer.
+It is recommended that this value is the maximum size of a MAC supported by the implementation, in bytes. The value must not be smaller than this maximum.</p>
+<p>See also <a class="reference internal" href="#c.PSA_MAC_LENGTH" title="PSA_MAC_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_MAC_LENGTH()</span></code></a>.</p>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Message authentication codes (MAC)</a><ul>
+<li><a class="reference internal" href="#mac-algorithms">MAC algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_HMAC"><code class="docutils literal"><span class="pre">PSA_ALG_HMAC</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_TRUNCATED_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_TRUNCATED_MAC</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_CBC_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_CBC_MAC</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_CMAC"><code class="docutils literal"><span class="pre">PSA_ALG_CMAC</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#single-part-mac-functions">Single-part MAC functions</a><ul>
+<li><a class="reference internal" href="#psa_mac_compute"><code class="docutils literal"><span class="pre">psa_mac_compute</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_mac_verify"><code class="docutils literal"><span class="pre">psa_mac_verify</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#multi-part-mac-operations">Multi-part MAC operations</a><ul>
+<li><a class="reference internal" href="#psa_mac_operation_t"><code class="docutils literal"><span class="pre">psa_mac_operation_t</span></code> (type)</a></li>
+<li><a class="reference internal" href="#PSA_MAC_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_MAC_OPERATION_INIT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#psa_mac_operation_init"><code class="docutils literal"><span class="pre">psa_mac_operation_init</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_mac_sign_setup"><code class="docutils literal"><span class="pre">psa_mac_sign_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_mac_verify_setup"><code class="docutils literal"><span class="pre">psa_mac_verify_setup</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_mac_update"><code class="docutils literal"><span class="pre">psa_mac_update</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_mac_sign_finish"><code class="docutils literal"><span class="pre">psa_mac_sign_finish</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_mac_verify_finish"><code class="docutils literal"><span class="pre">psa_mac_verify_finish</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_mac_abort"><code class="docutils literal"><span class="pre">psa_mac_abort</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_IS_HMAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HMAC</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_BLOCK_CIPHER_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_IS_BLOCK_CIPHER_MAC</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_FULL_LENGTH_MAC"><code class="docutils literal"><span class="pre">PSA_ALG_FULL_LENGTH_MAC</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_MAC_LENGTH"><code class="docutils literal"><span class="pre">PSA_MAC_LENGTH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_MAC_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_MAC_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="relations">
+<h3>Related Topics</h3>
+<ul>
+  <li><a href="../../index.html">Documentation overview</a><ul>
+  <li><a href="index.html">Cryptographic operation reference</a><ul>
+      <li>Previous: <a href="hashes.html" title="previous chapter">Message digests</a></li>
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+  <div class="section" id="asymmetric-encryption">
+<span id="pke"></span><h1>Asymmetric encryption</h1>
+<div class="section" id="asymmetric-encryption-algorithms">
+<span id="id1"></span><h2>Asymmetric encryption algorithms</h2>
+<div class="section" id="PSA_ALG_RSA_PKCS1V15_CRYPT">
+<span id="c.PSA_ALG_RSA_PKCS1V15_CRYPT"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code> (macro)</h3>
+<p>RSA PKCS#1 v1.5 encryption.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_CRYPT" title="PSA_ALG_RSA_PKCS1V15_CRYPT">PSA_ALG_RSA_PKCS1V15_CRYPT</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x07000200)
+</pre>
+</div>
+<div class="section" id="PSA_ALG_RSA_OAEP">
+<span id="c.PSA_ALG_RSA_OAEP"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_OAEP</span></code> (macro)</h3>
+<p>RSA OAEP encryption.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_RSA_OAEP" title="PSA_ALG_RSA_OAEP">PSA_ALG_RSA_OAEP</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>The hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true) to use for MGF1.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding RSA OAEP signature algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>This is the encryption scheme defined by <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html">RFC 8017</a> (PKCS#1: RSA Cryptography Specifications) under the name RSAES-OAEP, with the message generation function MGF1.</p>
+</div>
+</div>
+<div class="section" id="asymmetric-encryption-functions">
+<h2>Asymmetric encryption functions</h2>
+<div class="section" id="psa_asymmetric_encrypt">
+<span id="c.psa_asymmetric_encrypt"></span><h3><code class="docutils literal"><span class="pre">psa_asymmetric_encrypt</span></code> (function)</h3>
+<p>Encrypt a short message with a public key.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt">psa_asymmetric_encrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                    <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                                    const uint8_t * input,
+                                    size_t input_length,
+                                    const uint8_t * salt,
+                                    size_t salt_length,
+                                    uint8_t * output,
+                                    size_t output_size,
+                                    size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifer of the key to use for the operation. It must be a public key or an asymmetric key pair.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An asymmetric encryption algorithm that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>The message to encrypt.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">salt</span></code></dt>
+<dd>A salt or label, if supported by the encryption algorithm. If the algorithm does not support a salt, pass <code class="docutils literal"><span class="pre">NULL</span></code>. If the algorithm supports an optional salt, pass <code class="docutils literal"><span class="pre">NULL</span></code> to indicate that there is no salt.</dd>
+<dt> <code class="docutils literal"><span class="pre">salt_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">salt</span></code> buffer in bytes. If <code class="docutils literal"><span class="pre">salt</span></code> is <code class="docutils literal"><span class="pre">NULL</span></code>, pass <code class="docutils literal"><span class="pre">0</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the encrypted message is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>The required output size is <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are the type and bit-size respectively of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported asymmetric encryption.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_ENTROPY" title="PSA_ERROR_INSUFFICIENT_ENTROPY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_ENTROPY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<ul class="simple">
+<li>For <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_CRYPT" title="PSA_ALG_RSA_PKCS1V15_CRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code></a>, no salt is supported.</li>
+</ul>
+</div>
+<div class="section" id="psa_asymmetric_decrypt">
+<span id="c.psa_asymmetric_decrypt"></span><h3><code class="docutils literal"><span class="pre">psa_asymmetric_decrypt</span></code> (function)</h3>
+<p>Decrypt a short message with a private key.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt">psa_asymmetric_decrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                    <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                                    const uint8_t * input,
+                                    size_t input_length,
+                                    const uint8_t * salt,
+                                    size_t salt_length,
+                                    uint8_t * output,
+                                    size_t output_size,
+                                    size_t * output_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must be an asymmetric key pair.
+It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An asymmetric encryption algorithm that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>The message to decrypt.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">salt</span></code></dt>
+<dd>A salt or label, if supported by the encryption algorithm. If the algorithm does not support a salt, pass <code class="docutils literal"><span class="pre">NULL</span></code>. If the algorithm supports an optional salt, pass <code class="docutils literal"><span class="pre">NULL</span></code> to indicate that there is no salt.</dd>
+<dt> <code class="docutils literal"><span class="pre">salt_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">salt</span></code> buffer in bytes. If <code class="docutils literal"><span class="pre">salt</span></code> is <code class="docutils literal"><span class="pre">NULL</span></code>, pass <code class="docutils literal"><span class="pre">0</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Buffer where the decrypted message is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>The required output size is <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are the type and bit-size respectively of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported asymmetric decryption.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_ENTROPY" title="PSA_ERROR_INSUFFICIENT_ENTROPY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_ENTROPY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_PADDING" title="PSA_ERROR_INVALID_PADDING"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_PADDING</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<ul class="simple">
+<li>For <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_CRYPT" title="PSA_ALG_RSA_PKCS1V15_CRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code></a>, no salt is supported.</li>
+</ul>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_ALG_IS_RSA_OAEP">
+<span id="c.PSA_ALG_IS_RSA_OAEP"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_OAEP</span></code> (macro)</h3>
+<p>Whether the specified algorithm is an RSA OAEP encryption algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_RSA_OAEP" title="PSA_ALG_IS_RSA_OAEP">PSA_ALG_IS_RSA_OAEP</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an RSA OAEP algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
+<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE">
+<span id="c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>Sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</a>(key_type, key_bits, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>An asymmetric key type, either a key pair or a public key.</dd>
+<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
+<dd>The size of the key in bits.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The signature algorithm.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>If the parameters are valid and supported, return a buffer size in bytes that guarantees that <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</span></code></a> will not fail with <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a>. If the parameters are a valid combination that is not supported by the implementation, this macro must return either a sensible size or <code class="docutils literal"><span class="pre">0</span></code>. If the parameters are not valid, the return value is unspecified.</p>
+<p class="rubric">Description</p>
+<p>This macro returns a sufficient buffer size for a ciphertext produced using a key of the specified type and size, with the specified algorithm. Note that the actual size of the ciphertext might be smaller, depending on the algorithm.</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">This function might evaluate its arguments multiple times or zero times. Providing arguments that have side effects will result in implementation-specific behavior, and is non-portable.</p>
+</div>
+<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE">
+<span id="c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</span></code></a>, for any supported asymmetric encryption.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</a> \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE">
+<span id="c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>Sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</a>(key_type, key_bits, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>An asymmetric key type, either a key pair or a public key.</dd>
+<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
+<dd>The size of the key in bits.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The signature algorithm.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>If the parameters are valid and supported, return a buffer size in bytes that guarantees that <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</span></code></a> will not fail with <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a>. If the parameters are a valid combination that is not supported by the implementation, this macro must return either a sensible size or <code class="docutils literal"><span class="pre">0</span></code>. If the parameters are not valid, the return value is unspecified.</p>
+<p class="rubric">Description</p>
+<p>This macro returns a sufficient buffer size for a ciphertext produced using a key of the specified type and size, with the specified algorithm. Note that the actual size of the ciphertext might be smaller, depending on the algorithm.</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">This function might evaluate its arguments multiple times or zero times. Providing arguments that have side effects will result in implementation-specific behavior, and is non-portable.</p>
+</div>
+<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE">
+<span id="c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
+<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</span></code></a>, for any supported asymmetric decryption.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</a> \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Asymmetric encryption</a><ul>
+<li><a class="reference internal" href="#asymmetric-encryption-algorithms">Asymmetric encryption algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_RSA_PKCS1V15_CRYPT"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_RSA_OAEP"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_OAEP</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#asymmetric-encryption-functions">Asymmetric encryption functions</a><ul>
+<li><a class="reference internal" href="#psa_asymmetric_encrypt"><code class="docutils literal"><span class="pre">psa_asymmetric_encrypt</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_asymmetric_decrypt"><code class="docutils literal"><span class="pre">psa_asymmetric_decrypt</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_IS_RSA_OAEP"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_OAEP</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="relations">
+<h3>Related Topics</h3>
+<ul>
+  <li><a href="../../index.html">Documentation overview</a><ul>
+  <li><a href="index.html">Cryptographic operation reference</a><ul>
+      <li>Previous: <a href="sign.html" title="previous chapter">Asymmetric signature</a></li>
+      <li>Next: <a href="ka.html" title="next chapter">Key agreement</a></li>
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+      <div class="documentwrapper">
+        <div class="bodywrapper">
+          <div class="body" role="main">
+            
+  <div class="section" id="other-cryptographic-services">
+<h1>Other cryptographic services</h1>
+<div class="section" id="random-number-generation">
+<span id="rng"></span><h2>Random number generation</h2>
+<div class="section" id="psa_generate_random">
+<span id="c.psa_generate_random"></span><h3><code class="docutils literal"><span class="pre">psa_generate_random</span></code> (function)</h3>
+<p>Generate random bytes.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_generate_random" title="psa_generate_random">psa_generate_random</a>(uint8_t * output,
+                                 size_t output_size);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
+<dd>Output buffer for the generated data.</dd>
+<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
+<dd>Number of bytes to generate and output.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_ENTROPY" title="PSA_ERROR_INSUFFICIENT_ENTROPY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_ENTROPY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">This function <strong>can</strong> fail! Callers MUST check the return status and MUST NOT use the content of the output buffer if the return status is not <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SUCCESS</span></code></a>.</p>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">To generate a key, use <a class="reference internal" href="../keys/management.html#c.psa_generate_key" title="psa_generate_key"><code class="xref any c c-func docutils literal"><span class="pre">psa_generate_key()</span></code></a> instead.</p>
+</div>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Other cryptographic services</a><ul>
+<li><a class="reference internal" href="#random-number-generation">Random number generation</a><ul>
+<li><a class="reference internal" href="#psa_generate_random"><code class="docutils literal"><span class="pre">psa_generate_random</span></code> (function)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="relations">
+<h3>Related Topics</h3>
+<ul>
+  <li><a href="../../index.html">Documentation overview</a><ul>
+  <li><a href="index.html">Cryptographic operation reference</a><ul>
+      <li>Previous: <a href="ka.html" title="previous chapter">Key agreement</a></li>
+      <li>Next: <a href="../../appendix/example_header.html" title="next chapter">Example header file</a></li>
+  </ul></li>
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+    <h3>This Page</h3>
+    <ul class="this-page-menu">
+      <li><a href="../../_sources/api/ops/rng.rst.txt"
+            rel="nofollow">Show Source</a></li>
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+    <title>Asymmetric signature &#8212; PSA Crypto API 1.0.0 documentation</title>
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+            
+  <div class="section" id="asymmetric-signature">
+<span id="sign"></span><h1>Asymmetric signature</h1>
+<div class="section" id="asymmetric-signature-algorithms">
+<span id="sign-algorithms"></span><h2>Asymmetric signature algorithms</h2>
+<div class="section" id="PSA_ALG_RSA_PKCS1V15_SIGN">
+<span id="c.PSA_ALG_RSA_PKCS1V15_SIGN"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN</span></code> (macro)</h3>
+<p>RSA PKCS#1 v1.5 signature with hashing.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_SIGN" title="PSA_ALG_RSA_PKCS1V15_SIGN">PSA_ALG_RSA_PKCS1V15_SIGN</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true). This includes <a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code></a> when specifying the algorithm in a usage policy.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding RSA PKCS#1 v1.5 signature algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>This is the signature scheme defined by <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html">RFC 8017</a> (PKCS#1: RSA Cryptography Specifications) under the name RSASSA-PKCS1-v1_5.</p>
+</div>
+<div class="section" id="PSA_ALG_RSA_PKCS1V15_SIGN_RAW">
+<span id="c.PSA_ALG_RSA_PKCS1V15_SIGN_RAW"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN_RAW</span></code> (macro)</h3>
+<p>Raw PKCS#1 v1.5 signature.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_SIGN_RAW" title="PSA_ALG_RSA_PKCS1V15_SIGN_RAW">PSA_ALG_RSA_PKCS1V15_SIGN_RAW</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>) 0x06000200))
+</pre>
+<p>The input to this algorithm is the DigestInfo structure used by <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html#section-9.2">RFC 8017 §9.2</a> (PKCS#1: RSA Cryptography Specifications), in steps 3–6.</p>
+</div>
+<div class="section" id="PSA_ALG_RSA_PSS">
+<span id="c.PSA_ALG_RSA_PSS"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PSS</span></code> (macro)</h3>
+<p>RSA PSS signature with hashing.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_RSA_PSS" title="PSA_ALG_RSA_PSS">PSA_ALG_RSA_PSS</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true). This includes <a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code></a> when specifying the algorithm in a usage policy.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding RSA PSS signature algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>This is the signature scheme defined by <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html">RFC 8017</a> (PKCS#1: RSA Cryptography Specifications) under the name RSASSA-PSS, with the message generation function MGF1, and with a salt length equal to the length of the hash. The specified hash algorithm is used to hash the input message, to create the salted hash, and for the mask generation.</p>
+</div>
+<div class="section" id="PSA_ALG_ECDSA">
+<span id="c.PSA_ALG_ECDSA"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA</span></code> (macro)</h3>
+<p>ECDSA signature with hashing.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_ECDSA" title="PSA_ALG_ECDSA">PSA_ALG_ECDSA</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true). This includes <a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code></a> when specifying the algorithm in a usage policy.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding ECDSA signature algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>This is the <em>Elliptic Curve Digital Signature Algorithm (ECDSA)</em> defined by ANSI X9.62-2005, with a random per-message secret number (<em>k</em>).</p>
+<p>The representation of the signature as a byte string consists of the concatenation of the signature values <em>r</em> and <em>s</em>. Each of <em>r</em> and <em>s</em> is encoded as an <em>N</em>-octet string, where <em>N</em> is the length of the base point of the curve in octets. Each value is represented in big-endian order, with the most significant octet first.</p>
+</div>
+<div class="section" id="PSA_ALG_ECDSA_ANY">
+<span id="c.PSA_ALG_ECDSA_ANY"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA_ANY</span></code> (macro)</h3>
+<p>ECDSA signature without hashing.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_ECDSA_ANY" title="PSA_ALG_ECDSA_ANY">PSA_ALG_ECDSA_ANY</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>) 0x06000600))
+</pre>
+<p>This is the same signature scheme as <a class="reference internal" href="#c.PSA_ALG_ECDSA" title="PSA_ALG_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ECDSA()</span></code></a>, but without specifying a hash algorithm. This algorithm is only recommended to sign or verify a sequence of bytes that are an already-calculated hash. Note that the input is padded with zeros on the left or truncated on the left as required to fit the curve size.</p>
+</div>
+<div class="section" id="PSA_ALG_DETERMINISTIC_ECDSA">
+<span id="c.PSA_ALG_DETERMINISTIC_ECDSA"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_DETERMINISTIC_ECDSA</span></code> (macro)</h3>
+<p>Deterministic ECDSA signature with hashing.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_DETERMINISTIC_ECDSA" title="PSA_ALG_DETERMINISTIC_ECDSA">PSA_ALG_DETERMINISTIC_ECDSA</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
+<dd>A hash algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true). This includes <a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code></a> when specifying the algorithm in a usage policy.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>The corresponding deterministic ECDSA signature algorithm.</p>
+<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
+<p class="rubric">Description</p>
+<p>This is the deterministic ECDSA signature scheme defined by <a class="reference external" href="https://tools.ietf.org/html/rfc6979.html">RFC 6979</a>.</p>
+<p>The representation of a signature is the same as with <a class="reference internal" href="#c.PSA_ALG_ECDSA" title="PSA_ALG_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ECDSA()</span></code></a>.</p>
+<p>Note that when this algorithm is used for verification, signatures made with randomized ECDSA (<a class="reference internal" href="#c.PSA_ALG_ECDSA" title="PSA_ALG_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code>) with the same private key are accepted. In other words, <a class="reference internal" href="#c.PSA_ALG_DETERMINISTIC_ECDSA" title="PSA_ALG_DETERMINISTIC_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_DETERMINISTIC_ECDSA</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> differs from <a class="reference internal" href="#c.PSA_ALG_ECDSA" title="PSA_ALG_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> only for signature, not for verification.</p>
+</div>
+</div>
+<div class="section" id="asymmetric-signature-functions">
+<h2>Asymmetric signature functions</h2>
+<div class="section" id="psa_sign_message">
+<span id="c.psa_sign_message"></span><h3><code class="docutils literal"><span class="pre">psa_sign_message</span></code> (function)</h3>
+<p>Sign a message with a private key. For hash-and-sign algorithms, this includes the hashing step.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message">psa_sign_message</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                              <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                              const uint8_t * input,
+                              size_t input_length,
+                              uint8_t * signature,
+                              size_t signature_size,
+                              size_t * signature_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must be an asymmetric key pair. The key must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_MESSAGE" title="PSA_KEY_USAGE_SIGN_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_MESSAGE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An asymmetric signature algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="#c.PSA_ALG_IS_SIGN_MESSAGE" title="PSA_ALG_IS_SIGN_MESSAGE"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_MESSAGE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true), that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>The input message to sign.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature</span></code></dt>
+<dd>Buffer where the signature is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">signature</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>The required signature size is <a class="reference internal" href="#c.PSA_SIGN_OUTPUT_SIZE" title="PSA_SIGN_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are the type and bit-size respectively of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_SIGNATURE_MAX_SIZE" title="PSA_SIGNATURE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code></a> evaluates to the maximum signature size of any supported signature algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">signature_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned signature value.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_MESSAGE" title="PSA_KEY_USAGE_SIGN_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_MESSAGE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">signature</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_SIGN_OUTPUT_SIZE" title="PSA_SIGN_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_SIGNATURE_MAX_SIZE" title="PSA_SIGNATURE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_ENTROPY" title="PSA_ERROR_INSUFFICIENT_ENTROPY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_ENTROPY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">To perform a multi-part hash-and-sign signature algorithm, first use a <a class="reference internal" href="hashes.html#hash-mp"><span class="std std-ref">multi-part hash operation</span></a> and then pass the resulting hash to <a class="reference internal" href="#c.psa_sign_hash" title="psa_sign_hash"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_hash()</span></code></a>. <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_GET_HASH" title="PSA_ALG_GET_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_GET_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> can be used to determine the hash algorithm to use.</p>
+</div>
+</div>
+<div class="section" id="psa_verify_message">
+<span id="c.psa_verify_message"></span><h3><code class="docutils literal"><span class="pre">psa_verify_message</span></code> (function)</h3>
+<p>Verify the signature of a message with a public key, using a hash-and-sign verification algorithm.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_verify_message" title="psa_verify_message">psa_verify_message</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                                <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                                const uint8_t * input,
+                                size_t input_length,
+                                const uint8_t * signature,
+                                size_t signature_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must be a public key or an asymmetric key pair. The key must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_MESSAGE" title="PSA_KEY_USAGE_VERIFY_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_MESSAGE</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An asymmetric signature algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="#c.PSA_ALG_IS_SIGN_MESSAGE" title="PSA_ALG_IS_SIGN_MESSAGE"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_MESSAGE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true), that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
+<dd>The message whose signature is to be verified.</dd>
+<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature</span></code></dt>
+<dd>Buffer containing the signature to verify.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">signature</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>The signature is valid.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_MESSAGE" title="PSA_KEY_USAGE_VERIFY_MESSAGE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_MESSAGE</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The calculation was performed successfully, but the passed signature is not a valid signature.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">To perform a multi-part hash-and-sign signature verification algorithm, first use a <a class="reference internal" href="hashes.html#hash-mp"><span class="std std-ref">multi-part hash operation</span></a> to hash the message and then pass the resulting hash to <a class="reference internal" href="#c.psa_verify_hash" title="psa_verify_hash"><code class="xref any c c-func docutils literal"><span class="pre">psa_verify_hash()</span></code></a>. <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_GET_HASH" title="PSA_ALG_GET_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_GET_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> can be used to determine the hash algorithm to use.</p>
+</div>
+</div>
+<div class="section" id="psa_sign_hash">
+<span id="c.psa_sign_hash"></span><h3><code class="docutils literal"><span class="pre">psa_sign_hash</span></code> (function)</h3>
+<p>Sign an already-calculated hash with a private key.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_sign_hash" title="psa_sign_hash">psa_sign_hash</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                           <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                           const uint8_t * hash,
+                           size_t hash_length,
+                           uint8_t * signature,
+                           size_t signature_size,
+                           size_t * signature_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must be an asymmetric key pair. The key must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_HASH" title="PSA_KEY_USAGE_SIGN_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_HASH</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An asymmetric signature algorithm that separates the hash and sign operations (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="#c.PSA_ALG_IS_SIGN_HASH" title="PSA_ALG_IS_SIGN_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true), that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash</span></code></dt>
+<dd>The input to sign. This is usually the hash of a message. See the detailed description of this function and the description of individual signature algorithms for a detailed description of acceptable inputs.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">hash</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature</span></code></dt>
+<dd>Buffer where the signature is to be written.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature_size</span></code></dt>
+<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">signature</span></code> buffer in bytes.
+This must be appropriate for the selected algorithm and key:</p>
+<ul class="last simple">
+<li>The required signature size is <a class="reference internal" href="#c.PSA_SIGN_OUTPUT_SIZE" title="PSA_SIGN_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are the type and bit-size respectively of <code class="docutils literal"><span class="pre">key</span></code>.</li>
+<li><a class="reference internal" href="#c.PSA_SIGNATURE_MAX_SIZE" title="PSA_SIGNATURE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code></a> evaluates to the maximum signature size of any supported signature algorithm.</li>
+</ul>
+</dd>
+<dt> <code class="docutils literal"><span class="pre">signature_length</span></code></dt>
+<dd>On success, the number of bytes that make up the returned signature value.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_HASH" title="PSA_KEY_USAGE_SIGN_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_SIGN_HASH</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
+<dd>The size of the <code class="docutils literal"><span class="pre">signature</span></code> buffer is too small.
+<a class="reference internal" href="#c.PSA_SIGN_OUTPUT_SIZE" title="PSA_SIGN_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_SIGNATURE_MAX_SIZE" title="PSA_SIGNATURE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_ENTROPY" title="PSA_ERROR_INSUFFICIENT_ENTROPY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_ENTROPY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>With most signature mechanisms that follow the hash-and-sign paradigm, the hash input to this function is the hash of the message to sign. The hash algorithm is encoded in the signature algorithm.</p>
+<p>Some hash-and-sign mechanisms apply a padding or encoding to the hash. In such cases, the encoded hash must be passed to this function. The current version of this specification defines one such signature algorithm: <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_SIGN_RAW" title="PSA_ALG_RSA_PKCS1V15_SIGN_RAW"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN_RAW</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">To perform a hash-and-sign algorithm, the hash must be calculated before passing it to this function. This can be done by calling <a class="reference internal" href="hashes.html#c.psa_hash_compute" title="psa_hash_compute"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_compute()</span></code></a> or with a multi-part hash operation. Alternatively, to hash and sign a message in a single call, use <a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_message()</span></code></a>.</p>
+</div>
+</div>
+<div class="section" id="psa_verify_hash">
+<span id="c.psa_verify_hash"></span><h3><code class="docutils literal"><span class="pre">psa_verify_hash</span></code> (function)</h3>
+<p>Verify the signature of a hash or short message using a public key.</p>
+<pre class="literal-block">
+<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_verify_hash" title="psa_verify_hash">psa_verify_hash</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
+                             <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
+                             const uint8_t * hash,
+                             size_t hash_length,
+                             const uint8_t * signature,
+                             size_t signature_length);
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
+<dd>Identifier of the key to use for the operation. It must be a public key or an asymmetric key pair. The key must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_HASH" title="PSA_KEY_USAGE_VERIFY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_HASH</span></code></a>.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An asymmetric signature algorithm that separates the hash and sign operations (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="#c.PSA_ALG_IS_SIGN_HASH" title="PSA_ALG_IS_SIGN_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true), that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash</span></code></dt>
+<dd>The input whose signature is to be verified. This is usually the hash of a message. See the detailed description of this function and the description of individual signature algorithms for a detailed description of acceptable inputs.</dd>
+<dt> <code class="docutils literal"><span class="pre">hash_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">hash</span></code> buffer in bytes.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature</span></code></dt>
+<dd>Buffer containing the signature to verify.</dd>
+<dt> <code class="docutils literal"><span class="pre">signature_length</span></code></dt>
+<dd>Size of the <code class="docutils literal"><span class="pre">signature</span></code> buffer in bytes.</dd>
+</dl>
+<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
+<dl class="docutils">
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
+<dd>The signature is valid.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
+<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_VERIFY_HASH" title="PSA_KEY_USAGE_VERIFY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_VERIFY_HASH</span></code></a> flag, or it does not permit the requested algorithm.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
+<dd>The calculation was performed successfully, but the passed signature is not a valid signature.</dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
+<dd></dd>
+<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
+<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
+</dl>
+<p class="rubric">Description</p>
+<p>With most signature mechanisms that follow the hash-and-sign paradigm, the hash input to this function is the hash of the message to sign. The hash algorithm is encoded in the signature algorithm.</p>
+<p>Some hash-and-sign mechanisms apply a padding or encoding to the hash. In such cases, the encoded hash must be passed to this function. The current version of this specification defines one such signature algorithm: <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_SIGN_RAW" title="PSA_ALG_RSA_PKCS1V15_SIGN_RAW"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN_RAW</span></code></a>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">To perform a hash-and-sign verification algorithm, the hash must be calculated before passing it to this function. This can be done by calling <a class="reference internal" href="hashes.html#c.psa_hash_compute" title="psa_hash_compute"><code class="xref any c c-func docutils literal"><span class="pre">psa_hash_compute()</span></code></a> or with a multi-part hash operation. Alternatively, to hash and verify a message signature in a single call, use <a class="reference internal" href="#c.psa_verify_message" title="psa_verify_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_verify_message()</span></code></a>.</p>
+</div>
+</div>
+</div>
+<div class="section" id="support-macros">
+<h2>Support macros</h2>
+<div class="section" id="PSA_ALG_IS_SIGN_MESSAGE">
+<span id="c.PSA_ALG_IS_SIGN_MESSAGE"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_MESSAGE</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a signature algorithm that can be used with <a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_message()</span></code></a> and <a class="reference internal" href="#c.psa_verify_message" title="psa_verify_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_verify_message()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_SIGN_MESSAGE" title="PSA_ALG_IS_SIGN_MESSAGE">PSA_ALG_IS_SIGN_MESSAGE</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a signature algorithm that can be used to sign a message. <code class="docutils literal"><span class="pre">0</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a signature algorithm that can only be used to sign an already-calculated hash. <code class="docutils literal"><span class="pre">0</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a signature algorithm. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_SIGN_HASH">
+<span id="c.PSA_ALG_IS_SIGN_HASH"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_HASH</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a signature algorithm that can be used with <a class="reference internal" href="#c.psa_sign_hash" title="psa_sign_hash"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_hash()</span></code></a> and <a class="reference internal" href="#c.psa_verify_hash" title="psa_verify_hash"><code class="xref any c c-func docutils literal"><span class="pre">psa_verify_hash()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_SIGN_HASH" title="PSA_ALG_IS_SIGN_HASH">PSA_ALG_IS_SIGN_HASH</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a signature algorithm that can be used to sign a hash. <code class="docutils literal"><span class="pre">0</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a signature algorithm that can only be used to sign a message. <code class="docutils literal"><span class="pre">0</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a signature algorithm. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_RSA_PKCS1V15_SIGN">
+<span id="c.PSA_ALG_IS_RSA_PKCS1V15_SIGN"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_PKCS1V15_SIGN</span></code> (macro)</h3>
+<p>Whether the specified algorithm is an RSA PKCS#1 v1.5 signature algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_RSA_PKCS1V15_SIGN" title="PSA_ALG_IS_RSA_PKCS1V15_SIGN">PSA_ALG_IS_RSA_PKCS1V15_SIGN</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an RSA PKCS#1 v1.5 signature algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
+<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_RSA_PSS">
+<span id="c.PSA_ALG_IS_RSA_PSS"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_PSS</span></code> (macro)</h3>
+<p>Whether the specified algorithm is an RSA PSS signature algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_RSA_PSS" title="PSA_ALG_IS_RSA_PSS">PSA_ALG_IS_RSA_PSS</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an RSA PSS signature algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
+<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_ECDSA">
+<span id="c.PSA_ALG_IS_ECDSA"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_ECDSA</span></code> (macro)</h3>
+<p>Whether the specified algorithm is ECDSA.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_ECDSA" title="PSA_ALG_IS_ECDSA">PSA_ALG_IS_ECDSA</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an ECDSA algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
+<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_DETERMINISTIC_ECDSA">
+<span id="c.PSA_ALG_IS_DETERMINISTIC_ECDSA"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_DETERMINISTIC_ECDSA</span></code> (macro)</h3>
+<p>Whether the specified algorithm is deterministic ECDSA.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_DETERMINISTIC_ECDSA" title="PSA_ALG_IS_DETERMINISTIC_ECDSA">PSA_ALG_IS_DETERMINISTIC_ECDSA</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a deterministic ECDSA algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
+<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>See also <a class="reference internal" href="#c.PSA_ALG_IS_ECDSA" title="PSA_ALG_IS_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_IS_ECDSA()</span></code></a> and <a class="reference internal" href="#c.PSA_ALG_IS_RANDOMIZED_ECDSA" title="PSA_ALG_IS_RANDOMIZED_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_IS_RANDOMIZED_ECDSA()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_RANDOMIZED_ECDSA">
+<span id="c.PSA_ALG_IS_RANDOMIZED_ECDSA"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_RANDOMIZED_ECDSA</span></code> (macro)</h3>
+<p>Whether the specified algorithm is randomized ECDSA.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_RANDOMIZED_ECDSA" title="PSA_ALG_IS_RANDOMIZED_ECDSA">PSA_ALG_IS_RANDOMIZED_ECDSA</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a randomized ECDSA algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
+<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>See also <a class="reference internal" href="#c.PSA_ALG_IS_ECDSA" title="PSA_ALG_IS_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_IS_ECDSA()</span></code></a> and <a class="reference internal" href="#c.PSA_ALG_IS_DETERMINISTIC_ECDSA" title="PSA_ALG_IS_DETERMINISTIC_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_IS_DETERMINISTIC_ECDSA()</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_IS_HASH_AND_SIGN">
+<span id="c.PSA_ALG_IS_HASH_AND_SIGN"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH_AND_SIGN</span></code> (macro)</h3>
+<p>Whether the specified algorithm is a hash-and-sign algorithm that signs exactly the hash value.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_IS_HASH_AND_SIGN" title="PSA_ALG_IS_HASH_AND_SIGN">PSA_ALG_IS_HASH_AND_SIGN</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is a hash-and-sign algorithm that signs exactly the hash value, <code class="docutils literal"><span class="pre">0</span></code> otherwise. This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
+<p class="rubric">Description</p>
+<p>This macro identifies algorithms that can be used with <a class="reference internal" href="#c.psa_sign_hash" title="psa_sign_hash"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_hash()</span></code></a> that use the exact message hash value as an input the signature operation. This excludes hash-and-sign algorithms that require a encoded or modified hash for the signature step in the algorithm, such as <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_SIGN_RAW" title="PSA_ALG_RSA_PKCS1V15_SIGN_RAW"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN_RAW</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_ALG_ANY_HASH">
+<span id="c.PSA_ALG_ANY_HASH"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code> (macro)</h3>
+<p>In a hash-and-sign algorithm policy, allow any hash algorithm.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH">PSA_ALG_ANY_HASH</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x020000ff)
+</pre>
+<p>This value can be used to form the algorithm usage field of a policy for a signature algorithm that is parametrized by a hash. A key with this policy can then be used to perform operations using the same signature algorithm parametrized with any supported hash.
+A signature algorithm policy created using this macro is a wildcard policy, and <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_WILDCARD" title="PSA_ALG_IS_WILDCARD"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_IS_WILDCARD()</span></code></a> will return true.</p>
+<p>This value must not be used to build other algorithms that are parametrized over a hash. For any valid use of this macro to build an algorithm <code class="docutils literal"><span class="pre">alg</span></code>, <a class="reference internal" href="#c.PSA_ALG_IS_HASH_AND_SIGN" title="PSA_ALG_IS_HASH_AND_SIGN"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH_AND_SIGN</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true.</p>
+<p>This value must not be used to build an algorithm specification to perform an operation. It is only valid to build policies.</p>
+<p class="rubric">Usage</p>
+<p>For example, suppose that <code class="docutils literal"><span class="pre">PSA_xxx_SIGNATURE</span></code> is one of the following macros:</p>
+<ul class="simple">
+<li><a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_SIGN" title="PSA_ALG_RSA_PKCS1V15_SIGN"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN</span></code></a></li>
+<li><a class="reference internal" href="#c.PSA_ALG_RSA_PSS" title="PSA_ALG_RSA_PSS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PSS</span></code></a></li>
+<li><a class="reference internal" href="#c.PSA_ALG_ECDSA" title="PSA_ALG_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ECDSA</span></code></a></li>
+<li><a class="reference internal" href="#c.PSA_ALG_DETERMINISTIC_ECDSA" title="PSA_ALG_DETERMINISTIC_ECDSA"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_DETERMINISTIC_ECDSA</span></code></a></li>
+</ul>
+<p>The following sequence of operations shows how <a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code></a> can be used in a key policy:</p>
+<ul>
+<li><p class="first">Set the key usage field using <a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code></a>, for example:</p>
+<pre class="literal-block">
+<a class="reference internal" href="../keys/usage.html#c.psa_set_key_usage_flags" title="psa_set_key_usage_flags">psa_set_key_usage_flags</a>(&amp;attributes, <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_SIGN_MESSAGE" title="PSA_KEY_USAGE_SIGN_MESSAGE">PSA_KEY_USAGE_SIGN_MESSAGE</a>); // or VERIFY_MESSAGE
+<a class="reference internal" href="../keys/algorithms.html#c.psa_set_key_algorithm" title="psa_set_key_algorithm">psa_set_key_algorithm</a>(&amp;attributes, PSA_xxx_SIGNATURE(<a class="reference internal" href="#c.PSA_ALG_ANY_HASH" title="PSA_ALG_ANY_HASH">PSA_ALG_ANY_HASH</a>));
+</pre>
+</li>
+<li><p class="first">Import or generate key material.</p>
+</li>
+<li><p class="first">Call <a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_message()</span></code></a> or <a class="reference internal" href="#c.psa_verify_message" title="psa_verify_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_verify_message()</span></code></a>, passing an algorithm built from <code class="docutils literal"><span class="pre">PSA_xxx_SIGNATURE</span></code> and a specific hash. Each call to sign or verify a message can use a different hash algorithm.</p>
+<pre class="literal-block">
+<a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message">psa_sign_message</a>(key, PSA_xxx_SIGNATURE(<a class="reference internal" href="hashes.html#c.PSA_ALG_SHA_256" title="PSA_ALG_SHA_256">PSA_ALG_SHA_256</a>), ...);
+<a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message">psa_sign_message</a>(key, PSA_xxx_SIGNATURE(<a class="reference internal" href="hashes.html#c.PSA_ALG_SHA_512" title="PSA_ALG_SHA_512">PSA_ALG_SHA_512</a>), ...);
+<a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message">psa_sign_message</a>(key, PSA_xxx_SIGNATURE(<a class="reference internal" href="hashes.html#c.PSA_ALG_SHA3_256" title="PSA_ALG_SHA3_256">PSA_ALG_SHA3_256</a>), ...);
+</pre>
+</li>
+</ul>
+</div>
+<div class="section" id="PSA_SIGN_OUTPUT_SIZE">
+<span id="c.PSA_SIGN_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE</span></code> (macro)</h3>
+<p>Sufficient signature buffer size for <a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_message()</span></code></a> and <a class="reference internal" href="#c.psa_sign_hash" title="psa_sign_hash"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_hash()</span></code></a>.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_SIGN_OUTPUT_SIZE" title="PSA_SIGN_OUTPUT_SIZE">PSA_SIGN_OUTPUT_SIZE</a>(key_type, key_bits, alg) \
+    <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p class="rubric">Parameters</p>
+<dl class="docutils">
+<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
+<dd>An asymmetric key type. This can be a key pair type or a public key type.</dd>
+<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
+<dd>The size of the key in bits.</dd>
+<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
+<dd>The signature algorithm.</dd>
+</dl>
+<p class="rubric">Returns</p>
+<p>If the parameters are valid and supported, return a buffer size in bytes that guarantees that <a class="reference internal" href="#c.psa_sign_message" title="psa_sign_message"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_message()</span></code></a> and <a class="reference internal" href="#c.psa_sign_hash" title="psa_sign_hash"><code class="xref any c c-func docutils literal"><span class="pre">psa_sign_hash()</span></code></a> will not fail with <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a>. If the parameters are a valid combination that is not supported by the implementation, this macro must return either a sensible size or <code class="docutils literal"><span class="pre">0</span></code>. If the parameters are not valid, the return value is unspecified.</p>
+<p class="rubric">Description</p>
+<p>This macro returns a sufficient buffer size for a signature using a key of the specified type and size, with the specified algorithm. Note that the actual size of the signature might be smaller, as some algorithms produce a variable-size signature.</p>
+<div class="admonition warning">
+<p class="first admonition-title">Warning</p>
+<p class="last">This function might evaluate its arguments multiple times or zero times. Providing arguments that have side effects will result in implementation-specific behavior, and is non-portable.</p>
+</div>
+<p>See also <a class="reference internal" href="#c.PSA_SIGNATURE_MAX_SIZE" title="PSA_SIGNATURE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code></a>.</p>
+</div>
+<div class="section" id="PSA_SIGNATURE_MAX_SIZE">
+<span id="c.PSA_SIGNATURE_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code> (macro)</h3>
+<p>Maximum size of an asymmetric signature.</p>
+<pre class="literal-block">
+#define <a class="reference internal" href="#c.PSA_SIGNATURE_MAX_SIZE" title="PSA_SIGNATURE_MAX_SIZE">PSA_SIGNATURE_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
+</pre>
+<p>This macro must expand to a compile-time constant integer.
+It is recommended that this value is the maximum size of an asymmetric signature supported by the implementation, in bytes. The value must not be smaller than this maximum.</p>
+<p>See also <a class="reference internal" href="#c.PSA_SIGN_OUTPUT_SIZE" title="PSA_SIGN_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE()</span></code></a>.</p>
+</div>
+</div>
+</div>
+
+
+          </div>
+        </div>
+      </div>
+      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
+        <div class="sphinxsidebarwrapper">
+  <h3><a href="../../index.html">Table Of Contents</a></h3>
+  <ul>
+<li><a class="reference internal" href="#">Asymmetric signature</a><ul>
+<li><a class="reference internal" href="#asymmetric-signature-algorithms">Asymmetric signature algorithms</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_RSA_PKCS1V15_SIGN"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_RSA_PKCS1V15_SIGN_RAW"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_SIGN_RAW</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_RSA_PSS"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PSS</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_ECDSA_ANY"><code class="docutils literal"><span class="pre">PSA_ALG_ECDSA_ANY</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_DETERMINISTIC_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_DETERMINISTIC_ECDSA</span></code> (macro)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#asymmetric-signature-functions">Asymmetric signature functions</a><ul>
+<li><a class="reference internal" href="#psa_sign_message"><code class="docutils literal"><span class="pre">psa_sign_message</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_verify_message"><code class="docutils literal"><span class="pre">psa_verify_message</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_sign_hash"><code class="docutils literal"><span class="pre">psa_sign_hash</span></code> (function)</a></li>
+<li><a class="reference internal" href="#psa_verify_hash"><code class="docutils literal"><span class="pre">psa_verify_hash</span></code> (function)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
+<li><a class="reference internal" href="#PSA_ALG_IS_SIGN_MESSAGE"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_MESSAGE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_SIGN_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_SIGN_HASH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_RSA_PKCS1V15_SIGN"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_PKCS1V15_SIGN</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_RSA_PSS"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_PSS</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ECDSA</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_DETERMINISTIC_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_IS_DETERMINISTIC_ECDSA</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_RANDOMIZED_ECDSA"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RANDOMIZED_ECDSA</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_IS_HASH_AND_SIGN"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH_AND_SIGN</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_ALG_ANY_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_ANY_HASH</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_SIGN_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_SIGN_OUTPUT_SIZE</span></code> (macro)</a></li>
+<li><a class="reference internal" href="#PSA_SIGNATURE_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_SIGNATURE_MAX_SIZE</span></code> (macro)</a></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="relations">
+<h3>Related Topics</h3>
+<ul>
+  <li><a href="../../index.html">Documentation overview</a><ul>
+  <li><a href="index.html">Cryptographic operation reference</a><ul>
+      <li>Previous: <a href="kdf.html" title="previous chapter">Key derivation</a></li>
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