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<h1>Source code for M2Crypto.DH</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">absolute_import</span>
<span class="sd">"""M2Crypto wrapper for OpenSSL DH API.</span>
<span class="sd">Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved."""</span>
<span class="kn">from</span> <span class="nn">M2Crypto</span> <span class="kn">import</span> <span class="n">BIO</span><span class="p">,</span> <span class="n">m2</span>
<span class="kn">from</span> <span class="nn">M2Crypto.util</span> <span class="kn">import</span> <span class="n">genparam_callback</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">AnyStr</span><span class="p">,</span> <span class="n">Callable</span><span class="p">,</span> <span class="n">Optional</span> <span class="c1"># noqa</span>
<div class="viewcode-block" id="DHError"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.DHError">[docs]</a><span class="k">class</span> <span class="nc">DHError</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span>
<span class="k">pass</span></div>
<span class="n">m2</span><span class="o">.</span><span class="n">dh_init</span><span class="p">(</span><span class="n">DHError</span><span class="p">)</span>
<div class="viewcode-block" id="DH"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.DH">[docs]</a><span class="k">class</span> <span class="nc">DH</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""Object interface to the Diffie-Hellman key exchange protocol.</span>
<span class="sd"> """</span>
<span class="n">m2_dh_free</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_free</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dh</span><span class="p">,</span> <span class="n">_pyfree</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
<span class="c1"># type: (bytes, int) -> None</span>
<span class="k">assert</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_type_check</span><span class="p">(</span><span class="n">dh</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">dh</span> <span class="o">=</span> <span class="n">dh</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_pyfree</span> <span class="o">=</span> <span class="n">_pyfree</span>
<span class="k">def</span> <span class="fm">__del__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="k">if</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">'_pyfree'</span><span class="p">,</span> <span class="mi">0</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">m2_dh_free</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">)</span>
<span class="k">def</span> <span class="fm">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="k">assert</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_type_check</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">),</span> <span class="s2">"'dh' type error"</span>
<span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">dh_size</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">))</span>
<span class="k">def</span> <span class="fm">__getattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="c1"># type: (str) -> bytes</span>
<span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="s1">'p'</span><span class="p">,</span> <span class="s1">'g'</span><span class="p">,</span> <span class="s1">'pub'</span><span class="p">,</span> <span class="s1">'priv'</span><span class="p">):</span>
<span class="n">method</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">m2</span><span class="p">,</span> <span class="s1">'dh_get_</span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">name</span><span class="p">,))</span>
<span class="k">assert</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_type_check</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">),</span> <span class="s2">"'dh' type error"</span>
<span class="k">return</span> <span class="n">method</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">AttributeError</span>
<span class="k">def</span> <span class="fm">__setattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="c1"># type: (str, bytes) -> bytes</span>
<span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="s1">'p'</span><span class="p">,</span> <span class="s1">'g'</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">DHError</span><span class="p">(</span><span class="s1">'set (p, g) via set_params()'</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="s1">'pub'</span><span class="p">,</span> <span class="s1">'priv'</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">DHError</span><span class="p">(</span><span class="s1">'generate (pub, priv) via gen_key()'</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span>
<span class="k">def</span> <span class="nf">_ptr</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">dh</span>
<div class="viewcode-block" id="DH.check_params"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.DH.check_params">[docs]</a> <span class="k">def</span> <span class="nf">check_params</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="k">assert</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_type_check</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">),</span> <span class="s2">"'dh' type error"</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_check</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">)</span></div>
<div class="viewcode-block" id="DH.gen_key"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.DH.gen_key">[docs]</a> <span class="k">def</span> <span class="nf">gen_key</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="k">assert</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_type_check</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">),</span> <span class="s2">"'dh' type error"</span>
<span class="n">m2</span><span class="o">.</span><span class="n">dh_generate_key</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">)</span></div>
<div class="viewcode-block" id="DH.compute_key"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.DH.compute_key">[docs]</a> <span class="k">def</span> <span class="nf">compute_key</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pubkey</span><span class="p">):</span>
<span class="c1"># type: (bytes) -> bytes</span>
<span class="k">assert</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_type_check</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">),</span> <span class="s2">"'dh' type error"</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_compute_key</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">,</span> <span class="n">pubkey</span><span class="p">)</span></div>
<div class="viewcode-block" id="DH.print_params"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.DH.print_params">[docs]</a> <span class="k">def</span> <span class="nf">print_params</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">bio</span><span class="p">):</span>
<span class="c1"># type: (BIO.BIO) -> int</span>
<span class="k">assert</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_type_check</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">),</span> <span class="s2">"'dh' type error"</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">dhparams_print</span><span class="p">(</span><span class="n">bio</span><span class="o">.</span><span class="n">_ptr</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">dh</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="gen_params"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.gen_params">[docs]</a><span class="k">def</span> <span class="nf">gen_params</span><span class="p">(</span><span class="n">plen</span><span class="p">,</span> <span class="n">g</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="n">genparam_callback</span><span class="p">):</span>
<span class="c1"># type: (int, int, Optional[Callable]) -> DH</span>
<span class="n">dh_parms</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_generate_parameters</span><span class="p">(</span><span class="n">plen</span><span class="p">,</span> <span class="n">g</span><span class="p">,</span> <span class="n">callback</span><span class="p">)</span>
<span class="n">dh_obj</span> <span class="o">=</span> <span class="n">DH</span><span class="p">(</span><span class="n">dh_parms</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">return</span> <span class="n">dh_obj</span></div>
<div class="viewcode-block" id="load_params"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.load_params">[docs]</a><span class="k">def</span> <span class="nf">load_params</span><span class="p">(</span><span class="n">file</span><span class="p">):</span>
<span class="c1"># type: (AnyStr) -> DH</span>
<span class="k">with</span> <span class="n">BIO</span><span class="o">.</span><span class="n">openfile</span><span class="p">(</span><span class="n">file</span><span class="p">)</span> <span class="k">as</span> <span class="n">bio</span><span class="p">:</span>
<span class="k">return</span> <span class="n">load_params_bio</span><span class="p">(</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="load_params_bio"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.load_params_bio">[docs]</a><span class="k">def</span> <span class="nf">load_params_bio</span><span class="p">(</span><span class="n">bio</span><span class="p">):</span>
<span class="c1"># type: (BIO.BIO) -> DH</span>
<span class="k">return</span> <span class="n">DH</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">dh_read_parameters</span><span class="p">(</span><span class="n">bio</span><span class="o">.</span><span class="n">_ptr</span><span class="p">()),</span> <span class="mi">1</span><span class="p">)</span></div>
<div class="viewcode-block" id="set_params"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.DH.set_params">[docs]</a><span class="k">def</span> <span class="nf">set_params</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">g</span><span class="p">):</span>
<span class="c1"># type: (bytes, bytes) -> DH</span>
<span class="n">dh</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">dh_new</span><span class="p">()</span>
<span class="n">m2</span><span class="o">.</span><span class="n">dh_set_pg</span><span class="p">(</span><span class="n">dh</span><span class="p">,</span> <span class="n">p</span><span class="p">,</span> <span class="n">g</span><span class="p">)</span>
<span class="k">return</span> <span class="n">DH</span><span class="p">(</span><span class="n">dh</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span></div>
<span class="c1"># def free_params(cptr):</span>
<span class="c1"># m2.dh_free(cptr)</span>
<span class="n">DH_GENERATOR_2</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">DH_GENERATOR_2</span>
<span class="n">DH_GENERATOR_5</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">DH_GENERATOR_5</span>
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