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<h1>Source code for M2Crypto.BN</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span>
<span class="sd">"""</span>
<span class="sd">M2Crypto wrapper for OpenSSL BN (BIGNUM) API.</span>
<span class="sd">Copyright (c) 2005 Open Source Applications Foundation. All rights reserved.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">M2Crypto</span> <span class="k">import</span> <span class="n">m2</span><span class="p">,</span> <span class="n">util</span>
<span class="k">if</span> <span class="n">util</span><span class="o">.</span><span class="n">py27plus</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="k">import</span> <span class="n">Optional</span> <span class="c1"># noqa</span>
<div class="viewcode-block" id="rand"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BN.rand">[docs]</a><span class="k">def</span> <span class="nf">rand</span><span class="p">(</span><span class="n">bits</span><span class="p">,</span> <span class="n">top</span><span class="o">=-</span><span class="mi">1</span><span class="p">,</span> <span class="n">bottom</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
<span class="c1"># type: (int, int, int) -> Optional[int]</span>
<span class="sd">"""</span>
<span class="sd"> Generate cryptographically strong random number.</span>
<span class="sd"> :param bits: Length of random number in bits.</span>
<span class="sd"> :param top: If -1, the most significant bit can be 0. If 0, the most</span>
<span class="sd"> significant bit is 1, and if 1, the two most significant</span>
<span class="sd"> bits will be 1.</span>
<span class="sd"> :param bottom: If bottom is true, the number will be odd.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bn_rand</span><span class="p">(</span><span class="n">bits</span><span class="p">,</span> <span class="n">top</span><span class="p">,</span> <span class="n">bottom</span><span class="p">)</span></div>
<div class="viewcode-block" id="rand_range"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BN.rand_range">[docs]</a><span class="k">def</span> <span class="nf">rand_range</span><span class="p">(</span><span class="nb">range</span><span class="p">):</span>
<span class="c1"># type: (int) -> int</span>
<span class="sd">"""</span>
<span class="sd"> Generate a random number in a range.</span>
<span class="sd"> :param range: Upper limit for range.</span>
<span class="sd"> :return: A random number in the range [0, range)</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bn_rand_range</span><span class="p">(</span><span class="nb">range</span><span class="p">)</span></div>
<div class="viewcode-block" id="randfname"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BN.randfname">[docs]</a><span class="k">def</span> <span class="nf">randfname</span><span class="p">(</span><span class="n">length</span><span class="p">):</span>
<span class="c1"># type: (int) -> str</span>
<span class="sd">"""</span>
<span class="sd"> Return a random filename, which is simply a string where all</span>
<span class="sd"> the characters are from the set [a-zA-Z0-9].</span>
<span class="sd"> :param length: Length of filename to return.</span>
<span class="sd"> :return: random filename string</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">warnings</span>
<span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span>
<span class="s2">"Don't use BN.randfname(), use tempfile methods instead."</span><span class="p">,</span>
<span class="ne">DeprecationWarning</span><span class="p">,</span> <span class="n">stacklevel</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="n">letters</span> <span class="o">=</span> <span class="s1">'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890'</span>
<span class="n">lettersLen</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">letters</span><span class="p">)</span>
<span class="n">fname</span> <span class="o">=</span> <span class="p">[]</span> <span class="c1"># type: list</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">length</span><span class="p">):</span>
<span class="n">fname</span> <span class="o">+=</span> <span class="p">[</span><span class="n">letters</span><span class="p">[</span><span class="n">m2</span><span class="o">.</span><span class="n">bn_rand_range</span><span class="p">(</span><span class="n">lettersLen</span><span class="p">)]]</span>
<span class="k">return</span> <span class="s1">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">fname</span><span class="p">)</span></div>
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