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<h1>Source code for wolfcrypt.random</h1><div class="highlight"><pre>
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<span></span><span class="c1"># random.py</span>
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<span class="c1">#</span>
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<span class="c1"># Copyright (C) 2006-2018 wolfSSL Inc.</span>
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<span class="c1">#</span>
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<span class="c1"># This file is part of wolfSSL. (formerly known as CyaSSL)</span>
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<span class="c1">#</span>
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<span class="c1"># wolfSSL is free software; you can redistribute it and/or modify</span>
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<span class="c1"># it under the terms of the GNU General Public License as published by</span>
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<span class="c1"># the Free Software Foundation; either version 2 of the License, or</span>
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<span class="c1"># (at your option) any later version.</span>
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<span class="c1">#</span>
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<span class="c1"># wolfSSL is distributed in the hope that it will be useful,</span>
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<span class="c1"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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<span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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<span class="c1"># GNU General Public License for more details.</span>
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<span class="c1">#</span>
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<span class="c1"># You should have received a copy of the GNU General Public License</span>
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<span class="c1"># along with this program; if not, write to the Free Software</span>
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<span class="c1"># Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA</span>
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<span class="c1"># pylint: disable=no-member,no-name-in-module</span>
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<span class="kn">from</span> <span class="nn">wolfcrypt._ffi</span> <span class="k">import</span> <span class="n">ffi</span> <span class="k">as</span> <span class="n">_ffi</span>
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<span class="kn">from</span> <span class="nn">wolfcrypt._ffi</span> <span class="k">import</span> <span class="n">lib</span> <span class="k">as</span> <span class="n">_lib</span>
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<span class="kn">from</span> <span class="nn">wolfcrypt.exceptions</span> <span class="k">import</span> <span class="n">WolfCryptError</span>
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<div class="viewcode-block" id="Random"><a class="viewcode-back" href="../../random.html#wolfcrypt.random.Random">[docs]</a><span class="k">class</span> <span class="nc">Random</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> A Cryptographically Secure Pseudo Random Number Generator - CSPRNG</span>
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<span class="sd"> """</span>
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<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">native_object</span> <span class="o">=</span> <span class="n">_ffi</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s2">"WC_RNG *"</span><span class="p">)</span>
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<span class="n">ret</span> <span class="o">=</span> <span class="n">_lib</span><span class="o">.</span><span class="n">wc_InitRng</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">native_object</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">ret</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span> <span class="c1"># pragma: no cover</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">native_object</span> <span class="o">=</span> <span class="kc">None</span>
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<span class="k">raise</span> <span class="n">WolfCryptError</span><span class="p">(</span><span class="s2">"RNG init error (</span><span class="si">%d</span><span class="s2">)"</span> <span class="o">%</span> <span class="n">ret</span><span class="p">)</span>
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<span class="k">def</span> <span class="nf">__del__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">native_object</span><span class="p">:</span>
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<span class="k">try</span><span class="p">:</span>
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<span class="n">_lib</span><span class="o">.</span><span class="n">wc_FreeRng</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">native_object</span><span class="p">)</span>
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<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span> <span class="c1"># pragma: no cover</span>
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<span class="c1"># Can occur during interpreter shutdown</span>
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<span class="k">pass</span>
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<div class="viewcode-block" id="Random.byte"><a class="viewcode-back" href="../../random.html#wolfcrypt.random.Random.byte">[docs]</a> <span class="k">def</span> <span class="nf">byte</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Generate and return a random byte.</span>
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<span class="sd"> """</span>
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<span class="n">result</span> <span class="o">=</span> <span class="n">_ffi</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s1">'byte[1]'</span><span class="p">)</span>
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<span class="n">ret</span> <span class="o">=</span> <span class="n">_lib</span><span class="o">.</span><span class="n">wc_RNG_GenerateByte</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">native_object</span><span class="p">,</span> <span class="n">result</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">ret</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span> <span class="c1"># pragma: no cover</span>
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<span class="k">raise</span> <span class="n">WolfCryptError</span><span class="p">(</span><span class="s2">"RNG generate byte error (</span><span class="si">%d</span><span class="s2">)"</span> <span class="o">%</span> <span class="n">ret</span><span class="p">)</span>
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</div>
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<span class="k">return</span> <span class="n">_ffi</span><span class="o">.</span><span class="n">buffer</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="mi">1</span><span class="p">)[:]</span>
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<div class="viewcode-block" id="Random.bytes"><a class="viewcode-back" href="../../random.html#wolfcrypt.random.Random.bytes">[docs]</a> <span class="k">def</span> <span class="nf">bytes</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">length</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Generate and return a random sequence of length bytes.</span>
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<span class="sd"> """</span>
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<span class="n">result</span> <span class="o">=</span> <span class="n">_ffi</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s1">'byte[</span><span class="si">%d</span><span class="s1">]'</span> <span class="o">%</span> <span class="n">length</span><span class="p">)</span>
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<span class="n">ret</span> <span class="o">=</span> <span class="n">_lib</span><span class="o">.</span><span class="n">wc_RNG_GenerateBlock</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">native_object</span><span class="p">,</span> <span class="n">result</span><span class="p">,</span> <span class="n">length</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">ret</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span> <span class="c1"># pragma: no cover</span>
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<span class="k">raise</span> <span class="n">WolfCryptError</span><span class="p">(</span><span class="s2">"RNG generate block error (</span><span class="si">%d</span><span class="s2">)"</span> <span class="o">%</span> <span class="n">ret</span><span class="p">)</span>
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</div></div>
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<span class="k">return</span> <span class="n">_ffi</span><span class="o">.</span><span class="n">buffer</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">length</span><span class="p">)[:]</span>
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</pre></div>
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