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+<title>Platform Security Architecture — cryptography and keystore interface: Symmetric ciphers</title>
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+   <div id="projectname">Platform Security Architecture — cryptography and keystore interface
+   &#160;<span id="projectnumber">Working draft</span>
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+<iframe src="javascript:void(0)" frameborder="0" 
+        name="MSearchResults" id="MSearchResults">
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+</div>
+
+<div class="header">
+  <div class="summary">
+<a href="#typedef-members">Typedefs</a> &#124;
+<a href="#func-members">Functions</a>  </div>
+  <div class="headertitle">
+<div class="title">Symmetric ciphers</div>  </div>
+</div><!--header-->
+<div class="contents">
+<table class="memberdecls">
+<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a>
+Typedefs</h2></td></tr>
+<tr class="memitem:ga1399de29db657e3737bb09927aae51fa"><td class="memItemLeft" align="right" valign="top">typedef struct psa_cipher_operation_s&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a></td></tr>
+<tr class="separator:ga1399de29db657e3737bb09927aae51fa"><td class="memSeparator" colspan="2">&#160;</td></tr>
+</table><table class="memberdecls">
+<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
+Functions</h2></td></tr>
+<tr class="memitem:ga735c9d51b820e1d4cb45f2406ebfae98"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup</a> (<a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *operation, <a class="el" href="group__platform.html#gac3da92a6b8a7f0c01dc348f8e0432e4c">psa_key_slot_t</a> key, <a class="el" href="group__crypto__types.html#gac2e4d47f1300d73c2f829a6d99252d69">psa_algorithm_t</a> alg)</td></tr>
+<tr class="separator:ga735c9d51b820e1d4cb45f2406ebfae98"><td class="memSeparator" colspan="2">&#160;</td></tr>
+<tr class="memitem:ga8ce1efaa648d7e0dd00e878d655d2950"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup</a> (<a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *operation, <a class="el" href="group__platform.html#gac3da92a6b8a7f0c01dc348f8e0432e4c">psa_key_slot_t</a> key, <a class="el" href="group__crypto__types.html#gac2e4d47f1300d73c2f829a6d99252d69">psa_algorithm_t</a> alg)</td></tr>
+<tr class="separator:ga8ce1efaa648d7e0dd00e878d655d2950"><td class="memSeparator" colspan="2">&#160;</td></tr>
+<tr class="memitem:ga44857cf5e0c3d134a3c560f8ff5b50aa"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#ga44857cf5e0c3d134a3c560f8ff5b50aa">psa_cipher_generate_iv</a> (<a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *operation, unsigned char *iv, size_t iv_size, size_t *iv_length)</td></tr>
+<tr class="separator:ga44857cf5e0c3d134a3c560f8ff5b50aa"><td class="memSeparator" colspan="2">&#160;</td></tr>
+<tr class="memitem:ga1359b2101f31637496ce7cc36c6e3d42"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#ga1359b2101f31637496ce7cc36c6e3d42">psa_cipher_set_iv</a> (<a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *operation, const unsigned char *iv, size_t iv_length)</td></tr>
+<tr class="separator:ga1359b2101f31637496ce7cc36c6e3d42"><td class="memSeparator" colspan="2">&#160;</td></tr>
+<tr class="memitem:gafd0caea99cf1052527e4089d37f5ab91"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update</a> (<a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *operation, const uint8_t *input, size_t input_length, unsigned char *output, size_t output_size, size_t *output_length)</td></tr>
+<tr class="separator:gafd0caea99cf1052527e4089d37f5ab91"><td class="memSeparator" colspan="2">&#160;</td></tr>
+<tr class="memitem:ga1dcb58b8befe23f8a4d7a1d49c99249b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#ga1dcb58b8befe23f8a4d7a1d49c99249b">psa_cipher_finish</a> (<a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *operation, uint8_t *output, size_t output_size, size_t *output_length)</td></tr>
+<tr class="separator:ga1dcb58b8befe23f8a4d7a1d49c99249b"><td class="memSeparator" colspan="2">&#160;</td></tr>
+<tr class="memitem:gaad482cdca2098bca0620596aaa02eaa4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__cipher.html#gaad482cdca2098bca0620596aaa02eaa4">psa_cipher_abort</a> (<a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *operation)</td></tr>
+<tr class="separator:gaad482cdca2098bca0620596aaa02eaa4"><td class="memSeparator" colspan="2">&#160;</td></tr>
+</table>
+<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
+<h2 class="groupheader">Typedef Documentation</h2>
+<a id="ga1399de29db657e3737bb09927aae51fa"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#ga1399de29db657e3737bb09927aae51fa">&#9670;&nbsp;</a></span>psa_cipher_operation_t</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname">typedef struct psa_cipher_operation_s <a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>The type of the state data structure for multipart cipher operations.</p>
+<p>This is an implementation-defined <code>struct</code>. Applications should not make any assumptions about the content of this structure except as directed by the documentation of a specific implementation. </p>
+
+</div>
+</div>
+<h2 class="groupheader">Function Documentation</h2>
+<a id="gaad482cdca2098bca0620596aaa02eaa4"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#gaad482cdca2098bca0620596aaa02eaa4">&#9670;&nbsp;</a></span>psa_cipher_abort()</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_cipher_abort </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *&#160;</td>
+          <td class="paramname"><em>operation</em></td><td>)</td>
+          <td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Abort a cipher operation.</p>
+<p>Aborting an operation frees all associated resources except for the <code>operation</code> structure itself. Once aborted, the operation object can be reused for another operation by calling <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a> or <a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup()</a> again.</p>
+<p>You may call this function any time after the operation object has been initialized by any of the following methods:</p><ul>
+<li>A call to <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a> or <a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup()</a>, whether it succeeds or not.</li>
+<li>Initializing the <code>struct</code> to all-bits-zero.</li>
+<li>Initializing the <code>struct</code> to logical zeros, e.g. <code>psa_cipher_operation_t operation = {0}</code>.</li>
+</ul>
+<p>In particular, calling <a class="el" href="group__cipher.html#gaad482cdca2098bca0620596aaa02eaa4">psa_cipher_abort()</a> after the operation has been terminated by a call to <a class="el" href="group__cipher.html#gaad482cdca2098bca0620596aaa02eaa4">psa_cipher_abort()</a> or <a class="el" href="group__cipher.html#ga1dcb58b8befe23f8a4d7a1d49c99249b">psa_cipher_finish()</a> is safe and has no effect.</p>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[in,out]</td><td class="paramname">operation</td><td>Initialized cipher operation.</td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="retval"><dt>Return values</dt><dd>
+  <table class="retval">
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td><code>operation</code> is not an active cipher operation. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+<a id="ga8ce1efaa648d7e0dd00e878d655d2950"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#ga8ce1efaa648d7e0dd00e878d655d2950">&#9670;&nbsp;</a></span>psa_cipher_decrypt_setup()</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_cipher_decrypt_setup </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *&#160;</td>
+          <td class="paramname"><em>operation</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype"><a class="el" href="group__platform.html#gac3da92a6b8a7f0c01dc348f8e0432e4c">psa_key_slot_t</a>&#160;</td>
+          <td class="paramname"><em>key</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype"><a class="el" href="group__crypto__types.html#gac2e4d47f1300d73c2f829a6d99252d69">psa_algorithm_t</a>&#160;</td>
+          <td class="paramname"><em>alg</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Set the key for a multipart symmetric decryption operation.</p>
+<p>The sequence of operations to decrypt a message with a symmetric cipher is as follows:</p><ol type="1">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Call <a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup()</a> to specify the algorithm and key. The key remains associated with the operation even if the content of the key slot changes.</li>
+<li>Call <a class="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update()</a> with the IV (initialization vector) for the decryption. If the IV is prepended to the ciphertext, you can call <a class="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update()</a> on a buffer containing the IV followed by the beginning of the message.</li>
+<li>Call <a class="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update()</a> zero, one or more times, passing a fragment of the message each time.</li>
+<li>Call <a class="el" href="group__cipher.html#ga1dcb58b8befe23f8a4d7a1d49c99249b">psa_cipher_finish()</a>.</li>
+</ol>
+<p>The application may call <a class="el" href="group__cipher.html#gaad482cdca2098bca0620596aaa02eaa4">psa_cipher_abort()</a> at any time after the operation has been initialized with <a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup()</a>.</p>
+<p>After a successful call to <a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup()</a>, the application must eventually terminate the operation. The following events terminate an operation:</p><ul>
+<li>A failed call to <a class="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update()</a>.</li>
+<li>A call to <a class="el" href="group__cipher.html#ga1dcb58b8befe23f8a4d7a1d49c99249b">psa_cipher_finish()</a> or <a class="el" href="group__cipher.html#gaad482cdca2098bca0620596aaa02eaa4">psa_cipher_abort()</a>.</li>
+</ul>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[out]</td><td class="paramname">operation</td><td>The operation object to use. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">key</td><td>Slot containing the key to use for the operation. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">alg</td><td>The cipher algorithm to compute (<code>PSA_ALG_XXX</code> value such that <a class="el" href="group__crypto__types.html#ga1d1a5a402ad89a2e68f12bfb535490eb">PSA_ALG_IS_CIPHER</a>(<code>alg</code>) is true).</td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="retval"><dt>Return values</dt><dd>
+  <table class="retval">
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#gaba00e3e6ceb2b12965a81e5ac02ae040">PSA_ERROR_EMPTY_SLOT</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4d1b8dd8526177a15a210b7afc1accb1">PSA_ERROR_NOT_PERMITTED</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td><code>key</code> is not compatible with <code>alg</code>. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga1dcc6d130633ed5db8942257581b55dd">PSA_ERROR_NOT_SUPPORTED</a></td><td><code>alg</code> is not supported or is not a cipher algorithm. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+<a id="ga735c9d51b820e1d4cb45f2406ebfae98"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#ga735c9d51b820e1d4cb45f2406ebfae98">&#9670;&nbsp;</a></span>psa_cipher_encrypt_setup()</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_cipher_encrypt_setup </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *&#160;</td>
+          <td class="paramname"><em>operation</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype"><a class="el" href="group__platform.html#gac3da92a6b8a7f0c01dc348f8e0432e4c">psa_key_slot_t</a>&#160;</td>
+          <td class="paramname"><em>key</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype"><a class="el" href="group__crypto__types.html#gac2e4d47f1300d73c2f829a6d99252d69">psa_algorithm_t</a>&#160;</td>
+          <td class="paramname"><em>alg</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Set the key for a multipart symmetric encryption operation.</p>
+<p>The sequence of operations to encrypt a message with a symmetric cipher is as follows:</p><ol type="1">
+<li>Allocate an operation object which will be passed to all the functions listed here.</li>
+<li>Call <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a> to specify the algorithm and key. The key remains associated with the operation even if the content of the key slot changes.</li>
+<li>Call either <a class="el" href="group__cipher.html#ga44857cf5e0c3d134a3c560f8ff5b50aa">psa_cipher_generate_iv()</a> or <a class="el" href="group__cipher.html#ga1359b2101f31637496ce7cc36c6e3d42">psa_cipher_set_iv()</a> to generate or set the IV (initialization vector). You should use <a class="el" href="group__cipher.html#ga44857cf5e0c3d134a3c560f8ff5b50aa">psa_cipher_generate_iv()</a> unless the protocol you are implementing requires a specific IV value.</li>
+<li>Call <a class="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update()</a> zero, one or more times, passing a fragment of the message each time.</li>
+<li>Call <a class="el" href="group__cipher.html#ga1dcb58b8befe23f8a4d7a1d49c99249b">psa_cipher_finish()</a>.</li>
+</ol>
+<p>The application may call <a class="el" href="group__cipher.html#gaad482cdca2098bca0620596aaa02eaa4">psa_cipher_abort()</a> at any time after the operation has been initialized with <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a>.</p>
+<p>After a successful call to <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a>, the application must eventually terminate the operation. The following events terminate an operation:</p><ul>
+<li>A failed call to <a class="el" href="group__cipher.html#ga44857cf5e0c3d134a3c560f8ff5b50aa">psa_cipher_generate_iv()</a>, <a class="el" href="group__cipher.html#ga1359b2101f31637496ce7cc36c6e3d42">psa_cipher_set_iv()</a> or <a class="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update()</a>.</li>
+<li>A call to <a class="el" href="group__cipher.html#ga1dcb58b8befe23f8a4d7a1d49c99249b">psa_cipher_finish()</a> or <a class="el" href="group__cipher.html#gaad482cdca2098bca0620596aaa02eaa4">psa_cipher_abort()</a>.</li>
+</ul>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[out]</td><td class="paramname">operation</td><td>The operation object to use. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">key</td><td>Slot containing the key to use for the operation. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">alg</td><td>The cipher algorithm to compute (<code>PSA_ALG_XXX</code> value such that <a class="el" href="group__crypto__types.html#ga1d1a5a402ad89a2e68f12bfb535490eb">PSA_ALG_IS_CIPHER</a>(<code>alg</code>) is true).</td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="retval"><dt>Return values</dt><dd>
+  <table class="retval">
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#gaba00e3e6ceb2b12965a81e5ac02ae040">PSA_ERROR_EMPTY_SLOT</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4d1b8dd8526177a15a210b7afc1accb1">PSA_ERROR_NOT_PERMITTED</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td><code>key</code> is not compatible with <code>alg</code>. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga1dcc6d130633ed5db8942257581b55dd">PSA_ERROR_NOT_SUPPORTED</a></td><td><code>alg</code> is not supported or is not a cipher algorithm. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+<a id="ga1dcb58b8befe23f8a4d7a1d49c99249b"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#ga1dcb58b8befe23f8a4d7a1d49c99249b">&#9670;&nbsp;</a></span>psa_cipher_finish()</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_cipher_finish </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *&#160;</td>
+          <td class="paramname"><em>operation</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">uint8_t *&#160;</td>
+          <td class="paramname"><em>output</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>output_size</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t *&#160;</td>
+          <td class="paramname"><em>output_length</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Finish encrypting or decrypting a message in a cipher operation.</p>
+<p>The application must call <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a> or <a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup()</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="el" href="group__cipher.html#gafd0caea99cf1052527e4089d37f5ab91">psa_cipher_update()</a>.</p>
+<p>When this function returns, the operation becomes inactive.</p>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[in,out]</td><td class="paramname">operation</td><td>Active cipher operation. </td></tr>
+    <tr><td class="paramdir">[out]</td><td class="paramname">output</td><td>Buffer where the output is to be written. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">output_size</td><td>Size of the <code>output</code> buffer in bytes. </td></tr>
+    <tr><td class="paramdir">[out]</td><td class="paramname">output_length</td><td>On success, the number of bytes that make up the returned output.</td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="retval"><dt>Return values</dt><dd>
+  <table class="retval">
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td>The operation state is not valid (not started, IV required but not set, or already completed). </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga695025f4ec11249aee7ea3d0f65e01c8">PSA_ERROR_BUFFER_TOO_SMALL</a></td><td>The size of the <code>output</code> buffer is too small. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+<a id="ga44857cf5e0c3d134a3c560f8ff5b50aa"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#ga44857cf5e0c3d134a3c560f8ff5b50aa">&#9670;&nbsp;</a></span>psa_cipher_generate_iv()</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_cipher_generate_iv </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *&#160;</td>
+          <td class="paramname"><em>operation</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">unsigned char *&#160;</td>
+          <td class="paramname"><em>iv</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>iv_size</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t *&#160;</td>
+          <td class="paramname"><em>iv_length</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Generate an IV for a symmetric encryption operation.</p>
+<p>This function generates a random IV (initialization vector), nonce or initial counter value for the encryption operation as appropriate for the chosen algorithm, key type and key size.</p>
+<p>The application must call <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a> before calling this function.</p>
+<p>If this function returns an error status, the operation becomes inactive.</p>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[in,out]</td><td class="paramname">operation</td><td>Active cipher operation. </td></tr>
+    <tr><td class="paramdir">[out]</td><td class="paramname">iv</td><td>Buffer where the generated IV is to be written. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">iv_size</td><td>Size of the <code>iv</code> buffer in bytes. </td></tr>
+    <tr><td class="paramdir">[out]</td><td class="paramname">iv_length</td><td>On success, the number of bytes of the generated IV.</td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="retval"><dt>Return values</dt><dd>
+  <table class="retval">
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td>The operation state is not valid (not started, or IV already set). </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga695025f4ec11249aee7ea3d0f65e01c8">PSA_ERROR_BUFFER_TOO_SMALL</a></td><td>The size of the <code>iv</code> buffer is too small. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+<a id="ga1359b2101f31637496ce7cc36c6e3d42"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#ga1359b2101f31637496ce7cc36c6e3d42">&#9670;&nbsp;</a></span>psa_cipher_set_iv()</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_cipher_set_iv </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *&#160;</td>
+          <td class="paramname"><em>operation</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">const unsigned char *&#160;</td>
+          <td class="paramname"><em>iv</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>iv_length</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Set the IV for a symmetric encryption or decryption operation.</p>
+<p>This function sets the random IV (initialization vector), nonce or initial counter value for the encryption or decryption operation.</p>
+<p>The application must call <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a> before calling this function.</p>
+<p>If this function returns an error status, the operation becomes inactive.</p>
+<dl class="section note"><dt>Note</dt><dd>When encrypting, applications should use <a class="el" href="group__cipher.html#ga44857cf5e0c3d134a3c560f8ff5b50aa">psa_cipher_generate_iv()</a> instead of this function, unless implementing a protocol that requires a non-random IV.</dd></dl>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[in,out]</td><td class="paramname">operation</td><td>Active cipher operation. </td></tr>
+    <tr><td class="paramdir">[in]</td><td class="paramname">iv</td><td>Buffer containing the IV to use. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">iv_length</td><td>Size of the IV in bytes.</td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="retval"><dt>Return values</dt><dd>
+  <table class="retval">
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td>The operation state is not valid (not started, or IV already set). </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td>The size of <code>iv</code> is not acceptable for the chosen algorithm, or the chosen algorithm does not use an IV. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+<a id="gafd0caea99cf1052527e4089d37f5ab91"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#gafd0caea99cf1052527e4089d37f5ab91">&#9670;&nbsp;</a></span>psa_cipher_update()</h2>
+
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_cipher_update </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__cipher.html#ga1399de29db657e3737bb09927aae51fa">psa_cipher_operation_t</a> *&#160;</td>
+          <td class="paramname"><em>operation</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">const uint8_t *&#160;</td>
+          <td class="paramname"><em>input</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>input_length</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">unsigned char *&#160;</td>
+          <td class="paramname"><em>output</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>output_size</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t *&#160;</td>
+          <td class="paramname"><em>output_length</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Encrypt or decrypt a message fragment in an active cipher operation.</p>
+<p>Before calling this function, you must:</p><ol type="1">
+<li>Call either <a class="el" href="group__cipher.html#ga735c9d51b820e1d4cb45f2406ebfae98">psa_cipher_encrypt_setup()</a> or <a class="el" href="group__cipher.html#ga8ce1efaa648d7e0dd00e878d655d2950">psa_cipher_decrypt_setup()</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="el" href="group__cipher.html#ga44857cf5e0c3d134a3c560f8ff5b50aa">psa_cipher_generate_iv()</a> (recommended when encrypting) or <a class="el" href="group__cipher.html#ga1359b2101f31637496ce7cc36c6e3d42">psa_cipher_set_iv()</a>.</li>
+</ol>
+<p>If this function returns an error status, the operation becomes inactive.</p>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[in,out]</td><td class="paramname">operation</td><td>Active cipher operation. </td></tr>
+    <tr><td class="paramdir">[in]</td><td class="paramname">input</td><td>Buffer containing the message fragment to encrypt or decrypt. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">input_length</td><td>Size of the <code>input</code> buffer in bytes. </td></tr>
+    <tr><td class="paramdir">[out]</td><td class="paramname">output</td><td>Buffer where the output is to be written. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">output_size</td><td>Size of the <code>output</code> buffer in bytes. </td></tr>
+    <tr><td class="paramdir">[out]</td><td class="paramname">output_length</td><td>On success, the number of bytes that make up the returned output.</td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="retval"><dt>Return values</dt><dd>
+  <table class="retval">
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td>The operation state is not valid (not started, IV required but not set, or already completed). </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga695025f4ec11249aee7ea3d0f65e01c8">PSA_ERROR_BUFFER_TOO_SMALL</a></td><td>The size of the <code>output</code> buffer is too small. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
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