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+<title>Platform Security Architecture — cryptography and keystore interface: Key derivation</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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+<div class="header">
+  <div class="summary">
+<a href="#func-members">Functions</a>  </div>
+  <div class="headertitle">
+<div class="title">Key derivation</div>  </div>
+</div><!--header-->
+<div class="contents">
+<table class="memberdecls">
+<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
+Functions</h2></td></tr>
+<tr class="memitem:ga1b6429f443a45e5f3209043abbbe8315"><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__derivation.html#ga1b6429f443a45e5f3209043abbbe8315">psa_key_derivation</a> (<a class="el" href="group__generators.html#ga1f894c4fba202ef8e307d72caf489e3b">psa_crypto_generator_t</a> *generator, <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, const uint8_t *salt, size_t salt_length, const uint8_t *label, size_t label_length, size_t capacity)</td></tr>
+<tr class="separator:ga1b6429f443a45e5f3209043abbbe8315"><td class="memSeparator" colspan="2">&#160;</td></tr>
+</table>
+<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
+<h2 class="groupheader">Function Documentation</h2>
+<a id="ga1b6429f443a45e5f3209043abbbe8315"></a>
+<h2 class="memtitle"><span class="permalink"><a href="#ga1b6429f443a45e5f3209043abbbe8315">&#9670;&nbsp;</a></span>psa_key_derivation()</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_key_derivation </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__generators.html#ga1f894c4fba202ef8e307d72caf489e3b">psa_crypto_generator_t</a> *&#160;</td>
+          <td class="paramname"><em>generator</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>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">const uint8_t *&#160;</td>
+          <td class="paramname"><em>salt</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>salt_length</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">const uint8_t *&#160;</td>
+          <td class="paramname"><em>label</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>label_length</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>capacity</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+<p>Set up a key derivation operation.</p>
+<p>A key derivation algorithm takes three inputs: a secret input <code>key</code> and two non-secret inputs <code>label</code> and p salt. The result of this function is a byte generator which can be used to produce keys and other cryptographic material.</p>
+<p>The role of <code>label</code> and <code>salt</code> is as follows:</p><ul>
+<li>For HKDF (<a class="el" href="group__crypto__types.html#ga32a888fb360e6e25cab8a343772c4a82">PSA_ALG_HKDF</a>), <code>salt</code> is the salt used in the "extract" step and <code>label</code> is the info string used in the "expand" step.</li>
+</ul>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[in,out]</td><td class="paramname">generator</td><td>The generator object to set up. It must have been initialized to . </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">key</td><td>Slot containing the secret key to use. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">alg</td><td>The key derivation algorithm to compute (<code>PSA_ALG_XXX</code> value such that <a class="el" href="group__crypto__types.html#gaf8b90c648aa53dbd06c236695e300cd0">PSA_ALG_IS_KEY_DERIVATION</a>(<code>alg</code>) is true). </td></tr>
+    <tr><td class="paramdir">[in]</td><td class="paramname">salt</td><td>Salt to use. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">salt_length</td><td>Size of the <code>salt</code> buffer in bytes. </td></tr>
+    <tr><td class="paramdir">[in]</td><td class="paramname">label</td><td>Label to use. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">label_length</td><td>Size of the <code>label</code> buffer in bytes. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">capacity</td><td>The maximum number of bytes that the generator will be able to provide.</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>, or <code>capacity</code> is too large for the specified algorithm and key. </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 key derivation 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>
+
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