<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Python Binding — Botan</title> <link rel="stylesheet" href="_static/agogo.css" type="text/css" /> <link rel="stylesheet" href="_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: './', VERSION: '1.10.17', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="_static/jquery.js"></script> <script type="text/javascript" src="_static/underscore.js"></script> <script type="text/javascript" src="_static/doctools.js"></script> <link rel="index" title="Index" href="genindex.html" /> <link rel="search" title="Search" href="search.html" /> <link rel="top" title="Botan" href="contents.html" /> <link rel="next" title="Release Notes" href="log.html" /> <link rel="prev" title="Format Preserving Encryption" href="fpe.html" /> </head> <body role="document"> <div class="header-wrapper"> <div class="header"> <h1>Botan</h1> </div> </div> <div class="content-wrapper"> <div class="content"> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="python-binding"> <h1>Python Binding<a class="headerlink" href="#python-binding" title="Permalink to this headline">ΒΆ</a></h1> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The Python binding should be considered alpha software, and the interfaces may change in the future.</p> </div> <p>Botan includes a binding for Python, implemented using Boost.Python.</p> <div class="highlight-python"><div class="highlight"><pre><span></span><span class="ch">#!/usr/bin/python</span> <span class="kn">import</span> <span class="nn">botan</span> <span class="k">def</span> <span class="nf">make_into_c_array</span><span class="p">(</span><span class="n">ber</span><span class="p">):</span> <span class="n">output</span> <span class="o">=</span> <span class="s1">'static unsigned char key_data[</span><span class="si">%d</span><span class="s1">] = {</span><span class="se">\n\t</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">ber</span><span class="p">))</span> <span class="k">for</span> <span class="p">(</span><span class="n">idx</span><span class="p">,</span><span class="n">c</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">ber</span><span class="p">)),</span> <span class="n">ber</span><span class="p">):</span> <span class="k">if</span> <span class="n">idx</span> <span class="o">!=</span> <span class="mi">0</span> <span class="ow">and</span> <span class="n">idx</span> <span class="o">%</span> <span class="mi">8</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span> <span class="n">output</span> <span class="o">+=</span> <span class="s2">"</span><span class="se">\n\t</span><span class="s2">"</span> <span class="n">output</span> <span class="o">+=</span> <span class="s2">"0x</span><span class="si">%s</span><span class="s2">, "</span> <span class="o">%</span> <span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'hex'</span><span class="p">))</span> <span class="n">output</span> <span class="o">+=</span> <span class="s2">"</span><span class="se">\n</span><span class="s2">};</span><span class="se">\n</span><span class="s2">"</span> <span class="k">return</span> <span class="n">output</span> <span class="n">rng</span> <span class="o">=</span> <span class="n">botan</span><span class="o">.</span><span class="n">RandomNumberGenerator</span><span class="p">()</span> <span class="n">rsa_priv</span> <span class="o">=</span> <span class="n">botan</span><span class="o">.</span><span class="n">RSA_PrivateKey</span><span class="p">(</span><span class="mi">768</span><span class="p">,</span> <span class="n">rng</span><span class="p">)</span> <span class="k">print</span> <span class="n">rsa_priv</span><span class="o">.</span><span class="n">to_string</span><span class="p">()</span> <span class="k">print</span> <span class="nb">int</span><span class="p">(</span><span class="n">rsa_priv</span><span class="o">.</span><span class="n">get_N</span><span class="p">())</span> <span class="k">print</span> <span class="nb">int</span><span class="p">(</span><span class="n">rsa_priv</span><span class="o">.</span><span class="n">get_E</span><span class="p">())</span> <span class="n">rsa_pub</span> <span class="o">=</span> <span class="n">botan</span><span class="o">.</span><span class="n">RSA_PublicKey</span><span class="p">(</span><span class="n">rsa_priv</span><span class="p">)</span> <span class="k">print</span> <span class="n">make_into_c_array</span><span class="p">(</span><span class="n">rsa_pub</span><span class="o">.</span><span class="n">to_ber</span><span class="p">())</span> <span class="c1">#print make_into_c_array(rsa_priv.to_ber())</span> <span class="n">key</span> <span class="o">=</span> <span class="n">rng</span><span class="o">.</span><span class="n">gen_random</span><span class="p">(</span><span class="mi">20</span><span class="p">)</span> <span class="n">ciphertext</span> <span class="o">=</span> <span class="n">rsa_pub</span><span class="o">.</span><span class="n">encrypt</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="s1">'EME1(SHA-1)'</span><span class="p">,</span> <span class="n">rng</span><span class="p">)</span> <span class="k">print</span> <span class="n">ciphertext</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'hex'</span><span class="p">)</span> <span class="n">plaintext</span> <span class="o">=</span> <span class="n">rsa_priv</span><span class="o">.</span><span class="n">decrypt</span><span class="p">(</span><span class="n">ciphertext</span><span class="p">,</span> <span class="s1">'EME1(SHA-1)'</span><span class="p">)</span> <span class="k">print</span> <span class="n">plaintext</span> <span class="o">==</span> <span class="n">key</span> <span class="n">signature</span> <span class="o">=</span> <span class="n">rsa_priv</span><span class="o">.</span><span class="n">sign</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="s1">'EMSA4(SHA-256)'</span><span class="p">,</span> <span class="n">rng</span><span class="p">)</span> <span class="k">print</span> <span class="n">rsa_pub</span><span class="o">.</span><span class="n">verify</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">signature</span><span class="p">,</span> <span class="s1">'EMSA4(SHA-256)'</span><span class="p">)</span> <span class="c1"># Corrupt the signature, make sure it doesn't verify</span> <span class="n">signature</span> <span class="o">=</span> <span class="n">signature</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">signature</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="s1">'0'</span><span class="p">)</span> <span class="k">print</span> <span class="n">rsa_pub</span><span class="o">.</span><span class="n">verify</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">signature</span><span class="p">,</span> <span class="s1">'EMSA4(SHA-256)'</span><span class="p">)</span> </pre></div> </div> </div> </div> </div> </div> </div> <div class="sidebar"> <h3>Table Of Contents</h3> <ul class="current"> <li class="toctree-l1"><a class="reference internal" href="index.html">Welcome</a></li> <li class="toctree-l1"><a class="reference internal" href="reading.html">Recommended Reading</a></li> <li class="toctree-l1"><a class="reference internal" href="building.html">Building The Library</a></li> <li class="toctree-l1"><a class="reference internal" href="firststep.html">Getting Started</a></li> <li class="toctree-l1"><a class="reference internal" href="filters.html">Information Flow: Pipes and Filters</a></li> <li class="toctree-l1"><a class="reference internal" href="pubkey.html">Public Key Cryptography</a></li> <li class="toctree-l1"><a class="reference internal" href="x509.html">Certificate Handling</a></li> <li class="toctree-l1"><a class="reference internal" href="ssl.html">SSL and TLS</a></li> <li class="toctree-l1"><a class="reference internal" href="bigint.html">BigInt</a></li> <li class="toctree-l1"><a class="reference internal" href="lowlevel.html">The Low-Level Interface</a></li> <li class="toctree-l1"><a class="reference internal" href="secmem.html">Secure Memory Containers</a></li> <li class="toctree-l1"><a class="reference internal" href="kdf.html">Key Derivation Functions</a></li> <li class="toctree-l1"><a class="reference internal" href="pbkdf.html">PBKDF Algorithms</a></li> <li class="toctree-l1"><a class="reference internal" href="passhash.html">Password Hashing</a></li> <li class="toctree-l1"><a class="reference internal" href="rng.html">Random Number Generators</a></li> <li class="toctree-l1"><a class="reference internal" href="fpe.html">Format Preserving Encryption</a></li> <li class="toctree-l1 current"><a class="current reference internal" href="#">Python Binding</a></li> </ul> <div role="search"> <h3 style="margin-top: 1.5em;">Search</h3> <form class="search" action="search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input 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