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Randomness.html
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<div class="section" id="randomness">
<h1>Randomness<a class="headerlink" href="#randomness" title="Permalink to this headline">¶</a></h1>
<p>HACL* is equipped with a randomness function implemented with
platform dependant code for Unix and Windows.</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span>
<span class="n">KRML_DEPRECATED</span><span class="p">(</span><span class="s">"random_crypto"</span><span class="p">)</span><span class="w"></span>
<span class="k">extern</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">Lib_RandomBuffer_System_randombytes</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="o">*</span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">len</span><span class="p">);</span><span class="w"></span>
</pre></div>
</div>
<p>It takes a pointer to a memory location and a number of random bytes
to be written from that location. Beware of not asking for more bytes
than owned.</p>
<p>Internally, <code class="docutils literal notranslate"><span class="pre">read_random_bytes</span></code> is implemented using
<code class="docutils literal notranslate"><span class="pre">CryptGenRandom</span></code> for Microsoft Windows and using <code class="docutils literal notranslate"><span class="pre">/dev/urandom</span></code>
for Unix platforms.</p>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">This file is handwritten and is part of the TCB, hence it
should be minimally reviewed before being used.</p>
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