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+<title>Platform Security Architecture — cryptography and keystore interface: Random generation</title>
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+  <td id="projectalign" style="padding-left: 0.5em;">
+   <div id="projectname">Platform Security Architecture — cryptography and keystore interface
+   &#160;<span id="projectnumber">beta 1 — 2019-01-21</span>
+   </div>
+  </td>
+ </tr>
+ </tbody>
+</table>
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+<!-- end header part -->
+<!-- Generated by Doxygen 1.8.11 -->
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+      <li><a href="index.html"><span>Main&#160;Page</span></a></li>
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+        name="MSearchResults" id="MSearchResults">
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+</div>
+
+<div class="header">
+  <div class="summary">
+<a href="#nested-classes">Classes</a> &#124;
+<a href="#func-members">Functions</a>  </div>
+  <div class="headertitle">
+<div class="title">Random generation</div>  </div>
+</div><!--header-->
+<div class="contents">
+<table class="memberdecls">
+<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
+Classes</h2></td></tr>
+<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structpsa__generate__key__extra__rsa.html">psa_generate_key_extra_rsa</a></td></tr>
+<tr class="separator:"><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:ga1985eae417dfbccedf50d5fff54ea8c5"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__random.html#ga1985eae417dfbccedf50d5fff54ea8c5">psa_generate_random</a> (uint8_t *output, size_t output_size)</td></tr>
+<tr class="memdesc:ga1985eae417dfbccedf50d5fff54ea8c5"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate random bytes.  <a href="#ga1985eae417dfbccedf50d5fff54ea8c5">More...</a><br /></td></tr>
+<tr class="separator:ga1985eae417dfbccedf50d5fff54ea8c5"><td class="memSeparator" colspan="2">&#160;</td></tr>
+<tr class="memitem:ga72921520494b4f007a3afb904cd9ecdd"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__random.html#ga72921520494b4f007a3afb904cd9ecdd">psa_generate_key</a> (<a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> handle, <a class="el" href="group__crypto__types.html#ga578159487dfc7096cb191b0d2befe628">psa_key_type_t</a> type, size_t bits, const void *extra, size_t extra_size)</td></tr>
+<tr class="memdesc:ga72921520494b4f007a3afb904cd9ecdd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate a key or key pair.  <a href="#ga72921520494b4f007a3afb904cd9ecdd">More...</a><br /></td></tr>
+<tr class="separator:ga72921520494b4f007a3afb904cd9ecdd"><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 class="anchor" id="ga72921520494b4f007a3afb904cd9ecdd"></a>
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_generate_key </td>
+          <td>(</td>
+          <td class="paramtype"><a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a>&#160;</td>
+          <td class="paramname"><em>handle</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype"><a class="el" href="group__crypto__types.html#ga578159487dfc7096cb191b0d2befe628">psa_key_type_t</a>&#160;</td>
+          <td class="paramname"><em>type</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>bits</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">const void *&#160;</td>
+          <td class="paramname"><em>extra</em>, </td>
+        </tr>
+        <tr>
+          <td class="paramkey"></td>
+          <td></td>
+          <td class="paramtype">size_t&#160;</td>
+          <td class="paramname"><em>extra_size</em>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+
+<p>Generate a key or key pair. </p>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir"></td><td class="paramname">handle</td><td>Handle to the slot where the key will be stored. It must have been obtained by calling <a class="el" href="group__key__management.html#ga40094b77b7a42b9c8e158395113f1a35">psa_allocate_key()</a> or <a class="el" href="group__key__management.html#ga4108f255d3eaa6d23a7a14b684af8d7c">psa_create_key()</a> and must not contain key material yet. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">type</td><td>Key type (a <code>PSA_KEY_TYPE_XXX</code> value). </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">bits</td><td>Key size in bits. </td></tr>
+    <tr><td class="paramdir">[in]</td><td class="paramname">extra</td><td>Extra parameters for key generation. The interpretation of this parameter depends on <code>type</code>. All types support <code>NULL</code> to use default parameters. Implementation that support the generation of vendor-specific key types that allow extra parameters shall document the format of these extra parameters and the default values. For standard parameters, the meaning of <code>extra</code> is as follows:<ul>
+<li>For a symmetric key type (a type such that <a class="el" href="group__crypto__types.html#gab138ae2ebf2905dfbaf4154db2620939">PSA_KEY_TYPE_IS_ASYMMETRIC</a>(<code>type</code>) is false), <code>extra</code> must be <code>NULL</code>.</li>
+<li>For an elliptic curve key type (a type such that <a class="el" href="group__crypto__types.html#ga88e01fa06b585654689a99bcc06bbe66">PSA_KEY_TYPE_IS_ECC</a>(<code>type</code>) is false), <code>extra</code> must be <code>NULL</code>.</li>
+<li>For an RSA key (<code>type</code> is <a class="el" href="group__crypto__types.html#ga581f50687f5d650456925278948f2799">PSA_KEY_TYPE_RSA_KEYPAIR</a>), <code>extra</code> is an optional <a class="el" href="structpsa__generate__key__extra__rsa.html">psa_generate_key_extra_rsa</a> structure specifying the public exponent. The default public exponent used when <code>extra</code> is <code>NULL</code> is 65537.</li>
+<li>For an DSA key (<code>type</code> is <a class="el" href="group__crypto__types.html#ga011010ee28c20388f3d89fb27088ed62">PSA_KEY_TYPE_DSA_KEYPAIR</a>), <code>extra</code> is an optional structure specifying the key domain parameters. The key domain parameters can also be provided by <a class="el" href="group__import__export.html#ga091da8d3d39137fd6ad59f2b10234300" title="Set domain parameters for a key. ">psa_set_key_domain_parameters()</a>, which documents the format of the structure.</li>
+<li>For a DH key (<code>type</code> is <a class="el" href="group__crypto__types.html#ga39b63c6b97a62a316c0660bf72b2fdd5">PSA_KEY_TYPE_DH_KEYPAIR</a>), the <code>extra</code> is an optional structure specifying the key domain parameters. The key domain parameters can also be provided by <a class="el" href="group__import__export.html#ga091da8d3d39137fd6ad59f2b10234300" title="Set domain parameters for a key. ">psa_set_key_domain_parameters()</a>, which documents the format of the structure. </li>
+</ul>
+</td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">extra_size</td><td>Size of the buffer that <code>extra</code> points to, in bytes. Note that if <code>extra</code> is <code>NULL</code> then <code>extra_size</code> must be zero.</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__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. If the key is persistent, the key material and the key's metadata have been saved to persistent storage. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#gadf22718935657c2c3168c228204085f9">PSA_ERROR_INVALID_HANDLE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#gac2fee3a51249fbea45360aaa911f3e58">PSA_ERROR_OCCUPIED_SLOT</a></td><td>There is already a key in the specified slot. </td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga1dcc6d130633ed5db8942257581b55dd">PSA_ERROR_NOT_SUPPORTED</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga4deb59fec02297ec5d8b42178323f675">PSA_ERROR_INSUFFICIENT_ENTROPY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td>The library has not been previously initialized by <a class="el" href="group__initialization.html#ga2de150803fc2f7dc6101d5af7e921dd9" title="Library initialization. ">psa_crypto_init()</a>. It is implementation-dependent whether a failure to initialize results in this error code. </td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+<a class="anchor" id="ga1985eae417dfbccedf50d5fff54ea8c5"></a>
+<div class="memitem">
+<div class="memproto">
+      <table class="memname">
+        <tr>
+          <td class="memname"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_generate_random </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>&#160;</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td>)</td>
+          <td></td><td></td>
+        </tr>
+      </table>
+</div><div class="memdoc">
+
+<p>Generate random bytes. </p>
+<dl class="section warning"><dt>Warning</dt><dd>This function <b>can</b> 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="el" href="group__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a>.</dd></dl>
+<dl class="section note"><dt>Note</dt><dd>To generate a key, use <a class="el" href="group__random.html#ga72921520494b4f007a3afb904cd9ecdd" title="Generate a key or key pair. ">psa_generate_key()</a> instead.</dd></dl>
+<dl class="params"><dt>Parameters</dt><dd>
+  <table class="params">
+    <tr><td class="paramdir">[out]</td><td class="paramname">output</td><td>Output buffer for the generated data. </td></tr>
+    <tr><td class="paramdir"></td><td class="paramname">output_size</td><td>Number of bytes to generate and 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__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga1dcc6d130633ed5db8942257581b55dd">PSA_ERROR_NOT_SUPPORTED</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga4deb59fec02297ec5d8b42178323f675">PSA_ERROR_INSUFFICIENT_ENTROPY</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
+    <tr><td class="paramname"><a class="el" href="group__error.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td>The library has not been previously initialized by <a class="el" href="group__initialization.html#ga2de150803fc2f7dc6101d5af7e921dd9" title="Library initialization. ">psa_crypto_init()</a>. It is implementation-dependent whether a failure to initialize results in this error code. </td></tr>
+  </table>
+  </dd>
+</dl>
+
+</div>
+</div>
+</div><!-- contents -->
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