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<div class="section" id="random-number-generation">
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<h1>Random Number Generation<a class="headerlink" href="#random-number-generation" title="Permalink to this headline">¶</a></h1>
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<p>A <strong>cryptographically secure pseudo-random number generator</strong> (CSPRNG) is a
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<strong>pseudo-random number generator</strong> (PRNG) with properties that make it suitable
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for use in cryptography.</p>
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<p>Using the standard random module APIs for cryptographic keys or initialization
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vectors can result in major security issues depending on the algorithms in use.</p>
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<p><code class="docutils literal notranslate"><span class="pre">wolfcrypt</span></code> provides the following CSPRNG implementation:</p>
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<span class="target" id="module-wolfcrypt.random"></span><dl class="class">
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<dt id="wolfcrypt.random.Random">
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<em class="property">class </em><code class="descclassname">wolfcrypt.random.</code><code class="descname">Random</code><a class="reference internal" href="_modules/wolfcrypt/random.html#Random"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#wolfcrypt.random.Random" title="Permalink to this definition">¶</a></dt>
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<dd><p>A Cryptographically Secure Pseudo Random Number Generator - CSPRNG</p>
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<dl class="method">
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<dt id="wolfcrypt.random.Random.byte">
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<code class="descname">byte</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/wolfcrypt/random.html#Random.byte"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#wolfcrypt.random.Random.byte" title="Permalink to this definition">¶</a></dt>
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<dd><p>Generate and return a random byte.</p>
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</dd></dl>
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<dl class="method">
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<dt id="wolfcrypt.random.Random.bytes">
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<code class="descname">bytes</code><span class="sig-paren">(</span><em>length</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/wolfcrypt/random.html#Random.bytes"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#wolfcrypt.random.Random.bytes" title="Permalink to this definition">¶</a></dt>
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<dd><p>Generate and return a random sequence of length bytes.</p>
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</dd></dl>
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</dd></dl>
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<div class="section" id="example">
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<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">wolfcrypt.random</span> <span class="k">import</span> <span class="n">Random</span>
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<span class="go">>>></span>
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<span class="gp">>>> </span><span class="n">r</span> <span class="o">=</span> <span class="n">Random</span><span class="p">()</span>
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<span class="gp">>>> </span><span class="n">b</span> <span class="o">=</span> <span class="n">r</span><span class="o">.</span><span class="n">byte</span><span class="p">()</span>
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<span class="gp">>>> </span><span class="n">b</span>
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<span class="go">b'\x8c'</span>
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<span class="gp">>>> </span><span class="n">b16</span> <span class="o">=</span> <span class="n">r</span><span class="o">.</span><span class="n">bytes</span><span class="p">(</span><span class="mi">16</span><span class="p">)</span>
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<span class="gp">>>> </span><span class="n">b16</span>
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<span class="go">b']\x93nk\x95\xbc@\xffX\xab\xdcB\xda\x11\xf7\x03'</span>
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</pre></div>
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