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<title>M2Crypto.BIO — M2Crypto documentation</title>
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<h1>Source code for M2Crypto.BIO</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 BIO API.</span>
<span class="sd">Copyright (c) 1999-2004 Ng Pheng Siong. All rights reserved."""</span>
<span class="kn">import</span> <span class="nn">io</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Any</span><span class="p">,</span> <span class="n">AnyStr</span><span class="p">,</span> <span class="n">Callable</span><span class="p">,</span> <span class="n">Iterable</span><span class="p">,</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">Union</span> <span class="c1"># noqa</span>
<span class="kn">from</span> <span class="nn">M2Crypto</span> <span class="kn">import</span> <span class="n">m2</span><span class="p">,</span> <span class="n">six</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s1">'BIO'</span><span class="p">)</span>
<div class="viewcode-block" id="BIOError"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIOError">[docs]</a><span class="k">class</span> <span class="nc">BIOError</span><span class="p">(</span><span class="ne">ValueError</span><span class="p">):</span>
<span class="k">pass</span></div>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_init</span><span class="p">(</span><span class="n">BIOError</span><span class="p">)</span>
<div class="viewcode-block" id="BIO"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO">[docs]</a><span class="k">class</span> <span class="nc">BIO</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""Abstract object interface to the BIO API."""</span>
<span class="n">m2_bio_free</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_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">bio</span><span class="o">=</span><span class="kc">None</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="n">_close_cb</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="c1"># type: (Optional[BIO], int, Optional[Callable]) -> None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bio</span> <span class="o">=</span> <span class="n">bio</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="bp">self</span><span class="o">.</span><span class="n">_close_cb</span> <span class="o">=</span> <span class="n">_close_cb</span>
<span class="bp">self</span><span class="o">.</span><span class="n">closed</span> <span class="o">=</span> <span class="mi">0</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write_closed</span> <span class="o">=</span> <span class="mi">0</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="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pyfree</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">m2_bio_free</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</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">bio</span>
<span class="c1"># Deprecated.</span>
<span class="n">bio_ptr</span> <span class="o">=</span> <span class="n">_ptr</span>
<div class="viewcode-block" id="BIO.fileno"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.fileno">[docs]</a> <span class="k">def</span> <span class="nf">fileno</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_get_fd</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.readable"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.readable">[docs]</a> <span class="k">def</span> <span class="nf">readable</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> bool</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">closed</span></div>
<div class="viewcode-block" id="BIO.read"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.read">[docs]</a> <span class="k">def</span> <span class="nf">read</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="c1"># type: (int) -> Union[bytes, bytearray]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">readable</span><span class="p">():</span>
<span class="k">raise</span> <span class="ne">IOError</span><span class="p">(</span><span class="s1">'cannot read'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">size</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">buf</span> <span class="o">=</span> <span class="nb">bytearray</span><span class="p">()</span>
<span class="k">while</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">data</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_read</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="mi">4096</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">data</span><span class="p">:</span>
<span class="k">break</span>
<span class="n">buf</span> <span class="o">+=</span> <span class="n">data</span>
<span class="k">return</span> <span class="n">buf</span>
<span class="k">elif</span> <span class="n">size</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">return</span> <span class="sa">b</span><span class="s1">''</span>
<span class="k">elif</span> <span class="n">size</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'read count is negative'</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">bytes</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">bio_read</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">size</span><span class="p">))</span></div>
<div class="viewcode-block" id="BIO.readline"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.readline">[docs]</a> <span class="k">def</span> <span class="nf">readline</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">4096</span><span class="p">):</span>
<span class="c1"># type: (int) -> bytes</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">readable</span><span class="p">():</span>
<span class="k">raise</span> <span class="ne">IOError</span><span class="p">(</span><span class="s1">'cannot read'</span><span class="p">)</span>
<span class="n">buf</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_gets</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">size</span><span class="p">)</span>
<span class="n">buf</span> <span class="o">=</span> <span class="s1">''</span> <span class="k">if</span> <span class="n">buf</span> <span class="ow">is</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">buf</span>
<span class="k">return</span> <span class="n">six</span><span class="o">.</span><span class="n">ensure_binary</span><span class="p">(</span><span class="n">buf</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.readlines"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.readlines">[docs]</a> <span class="k">def</span> <span class="nf">readlines</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sizehint</span><span class="o">=</span><span class="s1">'ignored'</span><span class="p">):</span>
<span class="c1"># type: (Union[AnyStr, int]) -> Iterable[bytes]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">readable</span><span class="p">():</span>
<span class="k">raise</span> <span class="ne">IOError</span><span class="p">(</span><span class="s1">'cannot read'</span><span class="p">)</span>
<span class="n">lines</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">while</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">buf</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_gets</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="mi">4096</span><span class="p">)</span>
<span class="k">if</span> <span class="n">buf</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">break</span>
<span class="n">lines</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">six</span><span class="o">.</span><span class="n">ensure_binary</span><span class="p">(</span><span class="n">buf</span><span class="p">))</span>
<span class="k">return</span> <span class="n">lines</span></div>
<div class="viewcode-block" id="BIO.writeable"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.writeable">[docs]</a> <span class="k">def</span> <span class="nf">writeable</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> bool</span>
<span class="k">return</span> <span class="p">(</span><span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">closed</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span><span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">write_closed</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.write"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.write">[docs]</a> <span class="k">def</span> <span class="nf">write</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
<span class="c1"># type: (AnyStr) -> int</span>
<span class="sd">"""Write data to BIO.</span>
<span class="sd"> :return: either data written, or [0, -1] for nothing written,</span>
<span class="sd"> -2 not implemented</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">writeable</span><span class="p">():</span>
<span class="k">raise</span> <span class="ne">IOError</span><span class="p">(</span><span class="s1">'cannot write'</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">text_type</span><span class="p">):</span>
<span class="n">data</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'utf8'</span><span class="p">)</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_write</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.write_close"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.write_close">[docs]</a> <span class="k">def</span> <span class="nf">write_close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write_closed</span> <span class="o">=</span> <span class="mi">1</span></div>
<div class="viewcode-block" id="BIO.flush"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.flush">[docs]</a> <span class="k">def</span> <span class="nf">flush</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="sd">"""Flush the buffers.</span>
<span class="sd"> :return: 1 for success, and 0 or -1 for failure</span>
<span class="sd"> """</span>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_flush</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.reset"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.reset">[docs]</a> <span class="k">def</span> <span class="nf">reset</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="sd">"""Set the bio to its initial state.</span>
<span class="sd"> :return: 1 for success, and 0 or -1 for failure</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_reset</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.close"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.close">[docs]</a> <span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">closed</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_close_cb</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_close_cb</span><span class="p">()</span></div>
<div class="viewcode-block" id="BIO.should_retry"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.should_retry">[docs]</a> <span class="k">def</span> <span class="nf">should_retry</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="sd">"""</span>
<span class="sd"> Can the call be attempted again, or was there an error</span>
<span class="sd"> ie do_handshake</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_should_retry</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.should_read"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.should_read">[docs]</a> <span class="k">def</span> <span class="nf">should_read</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="sd">"""Should we read more data?"""</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_should_read</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.should_write"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.should_write">[docs]</a> <span class="k">def</span> <span class="nf">should_write</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="sd">"""Should we write more data?"""</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_should_write</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.tell"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.tell">[docs]</a> <span class="k">def</span> <span class="nf">tell</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""Return the current offset."""</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_tell</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="BIO.seek"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.BIO.seek">[docs]</a> <span class="k">def</span> <span class="nf">seek</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">off</span><span class="p">):</span>
<span class="sd">"""Seek to the specified absolute offset."""</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_seek</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">off</span><span class="p">)</span></div>
<span class="k">def</span> <span class="fm">__enter__</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="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="c1"># type: (*Any) -> int</span>
<span class="bp">self</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div>
<div class="viewcode-block" id="MemoryBuffer"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.MemoryBuffer">[docs]</a><span class="k">class</span> <span class="nc">MemoryBuffer</span><span class="p">(</span><span class="n">BIO</span><span class="p">):</span>
<span class="sd">"""Object interface to BIO_s_mem.</span>
<span class="sd"> Empirical testing suggests that this class performs less well than</span>
<span class="sd"> cStringIO, because cStringIO is implemented in C, whereas this class</span>
<span class="sd"> is implemented in Python. Thus, the recommended practice is to use</span>
<span class="sd"> cStringIO for regular work and convert said cStringIO object to</span>
<span class="sd"> a MemoryBuffer object only when necessary.</span>
<span class="sd"> """</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">data</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="c1"># type: (Optional[bytes]) -> None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">MemoryBuffer</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">if</span> <span class="n">data</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span>
<span class="s2">"data must be bytes or None, not </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">data</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span> <span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bio</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_new</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">bio_s_mem</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_pyfree</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="n">data</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_write</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">data</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">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_ctrl_pending</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span>
<div class="viewcode-block" id="MemoryBuffer.read"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.MemoryBuffer.read">[docs]</a> <span class="k">def</span> <span class="nf">read</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
<span class="c1"># type: (int) -> bytes</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">readable</span><span class="p">():</span>
<span class="k">raise</span> <span class="ne">IOError</span><span class="p">(</span><span class="s1">'cannot read'</span><span class="p">)</span>
<span class="k">if</span> <span class="n">size</span><span class="p">:</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_read</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">size</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_read</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_ctrl_pending</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">))</span></div>
<span class="c1"># Backwards-compatibility.</span>
<span class="n">getvalue</span> <span class="o">=</span> <span class="n">read_all</span> <span class="o">=</span> <span class="n">read</span>
<div class="viewcode-block" id="MemoryBuffer.write_close"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.MemoryBuffer.write_close">[docs]</a> <span class="k">def</span> <span class="nf">write_close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">MemoryBuffer</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">write_close</span><span class="p">()</span>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_set_mem_eof_return</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span></div>
<span class="n">close</span> <span class="o">=</span> <span class="n">write_close</span></div>
<div class="viewcode-block" id="File"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.File">[docs]</a><span class="k">class</span> <span class="nc">File</span><span class="p">(</span><span class="n">BIO</span><span class="p">):</span>
<span class="sd">"""Object interface to BIO_s_pyfd.</span>
<span class="sd"> This class interfaces Python to OpenSSL functions that expect BIO. For</span>
<span class="sd"> general file manipulation in Python, use Python's builtin file object.</span>
<span class="sd"> """</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">pyfile</span><span class="p">,</span> <span class="n">close_pyfile</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">'rb'</span><span class="p">):</span>
<span class="c1"># type: (Union[io.BytesIO, AnyStr], int, AnyStr) -> None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">File</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">_pyfree</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">pyfile</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">):</span>
<span class="n">pyfile</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">pyfile</span><span class="p">,</span> <span class="n">mode</span><span class="p">)</span>
<span class="c1"># This is for downward compatibility, but I don't think, that it is</span>
<span class="c1"># good practice to have two handles for the same file. Whats about</span>
<span class="c1"># concurrent write access? Last write, last wins? Especially since Py3</span>
<span class="c1"># has its own buffer management. See:</span>
<span class="c1">#</span>
<span class="c1"># https://docs.python.org/3.3/c-api/file.html</span>
<span class="c1">#</span>
<span class="n">pyfile</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fname</span> <span class="o">=</span> <span class="n">pyfile</span><span class="o">.</span><span class="n">name</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pyfile</span> <span class="o">=</span> <span class="n">pyfile</span>
<span class="c1"># Be wary of https://github.com/openssl/openssl/pull/1925</span>
<span class="c1"># BIO_new_fd is NEVER to be used before OpenSSL 1.1.1</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">m2</span><span class="p">,</span> <span class="s2">"bio_new_pyfd"</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bio</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_new_pyfd</span><span class="p">(</span><span class="n">pyfile</span><span class="o">.</span><span class="n">fileno</span><span class="p">(),</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_noclose</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="n">bio</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_new_pyfile</span><span class="p">(</span><span class="n">pyfile</span><span class="p">,</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_noclose</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">close_pyfile</span> <span class="o">=</span> <span class="n">close_pyfile</span>
<span class="bp">self</span><span class="o">.</span><span class="n">closed</span> <span class="o">=</span> <span class="kc">False</span>
<div class="viewcode-block" id="File.flush"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.File.flush">[docs]</a> <span class="k">def</span> <span class="nf">flush</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">File</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pyfile</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span></div>
<div class="viewcode-block" id="File.close"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.File.close">[docs]</a> <span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
<span class="nb">super</span><span class="p">(</span><span class="n">File</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">close_pyfile</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pyfile</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div>
<div class="viewcode-block" id="File.reset"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.File.reset">[docs]</a> <span class="k">def</span> <span class="nf">reset</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="sd">"""Set the bio to its initial state.</span>
<span class="sd"> :return: 0 for success, and -1 for failure</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">File</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span></div>
<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="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">closed</span><span class="p">:</span>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_free</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div>
<div class="viewcode-block" id="openfile"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.openfile">[docs]</a><span class="k">def</span> <span class="nf">openfile</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">'rb'</span><span class="p">):</span>
<span class="c1"># type: (AnyStr, AnyStr) -> File</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">mode</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">IOError</span> <span class="k">as</span> <span class="n">ex</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">BIOError</span><span class="p">(</span><span class="n">ex</span><span class="o">.</span><span class="n">args</span><span class="p">)</span>
<span class="k">return</span> <span class="n">File</span><span class="p">(</span><span class="n">f</span><span class="p">)</span></div>
<div class="viewcode-block" id="IOBuffer"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.IOBuffer">[docs]</a><span class="k">class</span> <span class="nc">IOBuffer</span><span class="p">(</span><span class="n">BIO</span><span class="p">):</span>
<span class="sd">"""Object interface to BIO_f_buffer.</span>
<span class="sd"> Its principal function is to be BIO_push()'ed on top of a BIO_f_ssl, so</span>
<span class="sd"> that makefile() of said underlying SSL socket works.</span>
<span class="sd"> """</span>
<span class="n">m2_bio_pop</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_pop</span>
<span class="n">m2_bio_free</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_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">under_bio</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">'rwb'</span><span class="p">,</span> <span class="n">_pyfree</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
<span class="c1"># type: (BIO, str, int) -> None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">IOBuffer</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">_pyfree</span><span class="o">=</span><span class="n">_pyfree</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">io</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_new</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">bio_f_buffer</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bio</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_push</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">io</span><span class="p">,</span> <span class="n">under_bio</span><span class="o">.</span><span class="n">_ptr</span><span class="p">())</span>
<span class="c1"># This reference keeps the underlying BIO alive while we're not closed.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_under_bio</span> <span class="o">=</span> <span class="n">under_bio</span>
<span class="k">if</span> <span class="s1">'w'</span> <span class="ow">in</span> <span class="n">mode</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write_closed</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write_closed</span> <span class="o">=</span> <span class="mi">1</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_bio_pop</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">m2_bio_free</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">io</span><span class="p">)</span>
<div class="viewcode-block" id="IOBuffer.close"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.IOBuffer.close">[docs]</a> <span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="n">BIO</span><span class="o">.</span><span class="n">close</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="CipherStream"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.CipherStream">[docs]</a><span class="k">class</span> <span class="nc">CipherStream</span><span class="p">(</span><span class="n">BIO</span><span class="p">):</span>
<span class="sd">"""Object interface to BIO_f_cipher."""</span>
<span class="n">SALT_LEN</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">PKCS5_SALT_LEN</span>
<span class="n">m2_bio_pop</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_pop</span>
<span class="n">m2_bio_free</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_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">obio</span><span class="p">):</span>
<span class="c1"># type: (BIO) -> None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">CipherStream</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">_pyfree</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">obio</span> <span class="o">=</span> <span class="n">obio</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bio</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_new</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">bio_f_cipher</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">closed</span> <span class="o">=</span> <span class="mi">0</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="ow">not</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">'closed'</span><span class="p">,</span> <span class="mi">1</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<div class="viewcode-block" id="CipherStream.close"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.CipherStream.close">[docs]</a> <span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">m2_bio_pop</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">m2_bio_free</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">closed</span> <span class="o">=</span> <span class="mi">1</span></div>
<div class="viewcode-block" id="CipherStream.write_close"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.CipherStream.write_close">[docs]</a> <span class="k">def</span> <span class="nf">write_close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">obio</span><span class="o">.</span><span class="n">write_close</span><span class="p">()</span></div>
<div class="viewcode-block" id="CipherStream.set_cipher"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.CipherStream.set_cipher">[docs]</a> <span class="k">def</span> <span class="nf">set_cipher</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">algo</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">iv</span><span class="p">,</span> <span class="n">op</span><span class="p">):</span>
<span class="c1"># type: (str, AnyStr, AnyStr, int) -> None</span>
<span class="n">cipher</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="n">algo</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">cipher</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'unknown cipher'</span><span class="p">,</span> <span class="n">algo</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">):</span>
<span class="n">key</span> <span class="o">=</span> <span class="n">key</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'utf8'</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">iv</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">):</span>
<span class="n">iv</span> <span class="o">=</span> <span class="n">iv</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'utf8'</span><span class="p">)</span>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_set_cipher</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">cipher</span><span class="p">(),</span> <span class="n">key</span><span class="p">,</span> <span class="n">iv</span><span class="p">,</span> <span class="nb">int</span><span class="p">(</span><span class="n">op</span><span class="p">))</span>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_push</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">obio</span><span class="o">.</span><span class="n">_ptr</span><span class="p">())</span></div></div>
<div class="viewcode-block" id="SSLBio"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.SSLBio">[docs]</a><span class="k">class</span> <span class="nc">SSLBio</span><span class="p">(</span><span class="n">BIO</span><span class="p">):</span>
<span class="sd">"""Object interface to BIO_f_ssl."""</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">_pyfree</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
<span class="c1"># type: (int) -> None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">SSLBio</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">_pyfree</span><span class="o">=</span><span class="n">_pyfree</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bio</span> <span class="o">=</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_new</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">bio_f_ssl</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">closed</span> <span class="o">=</span> <span class="mi">0</span>
<div class="viewcode-block" id="SSLBio.set_ssl"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.SSLBio.set_ssl">[docs]</a> <span class="k">def</span> <span class="nf">set_ssl</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">conn</span><span class="p">,</span> <span class="n">close_flag</span><span class="o">=</span><span class="n">m2</span><span class="o">.</span><span class="n">bio_noclose</span><span class="p">):</span>
<span class="c1">## type: (Connection, int) -> None</span>
<span class="sd">"""</span>
<span class="sd"> Sets the bio to the SSL pointer which is</span>
<span class="sd"> contained in the connection object.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_pyfree</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">m2</span><span class="o">.</span><span class="n">bio_set_ssl</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">ssl</span><span class="p">,</span> <span class="n">close_flag</span><span class="p">)</span>
<span class="k">if</span> <span class="n">close_flag</span> <span class="o">==</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_noclose</span><span class="p">:</span>
<span class="n">conn</span><span class="o">.</span><span class="n">set_ssl_close_flag</span><span class="p">(</span><span class="n">m2</span><span class="o">.</span><span class="n">bio_close</span><span class="p">)</span></div>
<div class="viewcode-block" id="SSLBio.do_handshake"><a class="viewcode-back" href="../../M2Crypto.html#M2Crypto.BIO.SSLBio.do_handshake">[docs]</a> <span class="k">def</span> <span class="nf">do_handshake</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># type: () -> int</span>
<span class="sd">"""Do the handshake.</span>
<span class="sd"> Return 1 if the handshake completes</span>
<span class="sd"> Return 0 or a negative number if there is a problem</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">m2</span><span class="o">.</span><span class="n">bio_do_handshake</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bio</span><span class="p">)</span></div></div>
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