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| <div class="section" id="other-cryptographic-services"> |
| <h1>10.10. Other cryptographic services</h1> |
| <div class="section" id="random-number-generation"> |
| <span id="rng"></span><h2>10.10.1. 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>Success. |
| <code class="docutils literal"><span class="pre">output</span></code> contains <code class="docutils literal"><span class="pre">output_size</span></code> bytes of generated random data.</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 requires initializing by a call to <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>.</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_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt> |
| <dd></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> |
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| <div class="sphinxsidebarwrapper"><h3><a href="../../index.html"><b>PSA Crypto API</b></a></h3> |
| IHI 0086<br/> |
| Non-confidential<br/> |
| Version 1.1.0 |
| <span style="color: red; font-weight: bold;"></span> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../../about.html">About this document</a></li> |
| </ul> |
| <ul class="current"> |
| <li class="toctree-l1"><a class="reference internal" href="../../overview/intro.html">1. Introduction</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../overview/goals.html">2. Design goals</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../overview/functionality.html">3. Functionality overview</a></li> |
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| <li class="toctree-l1 current"><a class="reference internal" href="index.html">10. Cryptographic operation reference</a><ul class="current"> |
| <li class="toctree-l2"><a class="reference internal" href="algorithms.html">10.1. Algorithms</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="hashes.html">10.2. Message digests (Hashes)</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="macs.html">10.3. Message authentication codes (MAC)</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="ciphers.html">10.4. Unauthenticated ciphers</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="aead.html">10.5. Authenticated encryption with associated data (AEAD)</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="kdf.html">10.6. Key derivation</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="sign.html">10.7. Asymmetric signature</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="pke.html">10.8. Asymmetric encryption</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="ka.html">10.9. Key agreement</a></li> |
| <li class="toctree-l2 current"><a class="current reference internal" href="#">10.10. Other cryptographic services</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="#random-number-generation">10.10.1. Random number generation</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../../appendix/example_header.html">Example header file</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../appendix/encodings.html">Algorithm and key type encoding</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../appendix/specdef_values.html">Example macro implementations</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../appendix/sra.html">Security Risk Assessment</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../appendix/history.html">Changes to the API</a></li> |
| </ul> |
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