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+<title>3.3 SSL -- An interface to the SSL-specific parts of OpenSSL </title>
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+<H2><A NAME="SECTION000430000000000000000">&nbsp;</A>
+<BR>
+3.3 <tt class="module">SSL</tt> -- An interface to the SSL-specific parts of OpenSSL
+</H2>
+<P>
+<EM><EM><EM>
+</EM></EM></EM>
+<P>
+<EM><EM><EM>This module handles things specific to SSL. There are two objects defined:
+Context, Connection.
+</EM></EM></EM>
+<P>
+<dl><dt><b><a name='l2h-90'><tt>SSLv2_METHOD</tt></a></b>
+<dd>
+<dt><b><a name='l2h-104'><tt>SSLv3_METHOD</tt></a></b><dd>
+<dt><b><a name='l2h-105'><tt>SSLv23_METHOD</tt></a></b><dd>
+<dt><b><a name='l2h-106'><tt>TLSv1_METHOD</tt></a></b><dd>
+These constants represent the different SSL methods to use when creating a
+context object.
+</dl>
+<P>
+<dl><dt><b><a name='l2h-91'><tt>VERIFY_NONE</tt></a></b>
+<dd>
+<dt><b><a name='l2h-107'><tt>VERIFY_PEER</tt></a></b><dd>
+<dt><b><a name='l2h-108'><tt>VERIFY_FAIL_IF_NO_PEER_CERT</tt></a></b><dd>
+These constants represent the verification mode used by the Context
+object's <tt class="method">set_verify</tt> method.
+</dl>
+<P>
+<dl><dt><b><a name='l2h-92'><tt>FILETYPE_PEM</tt></a></b>
+<dd>
+<dt><b><a name='l2h-109'><tt>FILETYPE_ASN1</tt></a></b><dd>
+File type constants used with the <tt class="method">use_certificate_file</tt> and
+<tt class="method">use_privatekey_file</tt> methods of Context objects.
+</dl>
+<P>
+<dl><dt><b><a name='l2h-93'><tt>OP_SINGLE_DH_USE</tt></a></b>
+<dd>
+<dt><b><a name='l2h-110'><tt>OP_EPHEMERAL_RSA</tt></a></b><dd>
+<dt><b><a name='l2h-111'><tt>OP_NO_SSLv2</tt></a></b><dd>
+<dt><b><a name='l2h-112'><tt>OP_NO_SSLv3</tt></a></b><dd>
+<dt><b><a name='l2h-113'><tt>OP_NO_TLSv1</tt></a></b><dd>
+Constants used with <tt class="method">set_options</tt> of Context objects.
+<tt class="constant">OP_SINGLE_DH_USE</tt> means to always create a new key when using ephemeral
+Diffie-Hellman. <tt class="constant">OP_EPHEMERAL_RSA</tt> means to always use ephemeral RSA keys
+when doing RSA operations. <tt class="constant">OP_NO_SSLv2</tt>, <tt class="constant">OP_NO_SSLv3</tt> and
+<tt class="constant">OP_NO_TLSv1</tt> means to disable those specific protocols. This is
+interesting if you're using e.g. <tt class="constant">SSLv23_METHOD</tt> to get an SSLv2-compatible
+handshake, but don't want to use SSLv2.
+</dl>
+<P>
+<dl><dt><b><a name='l2h-94'><tt>ContextType</tt></a></b>
+<dd>
+A Python type object representing the Context object type.
+</dl>
+<P>
+<dl><dt><b><a name='l2h-95'><tt class='function'>Context</tt></a></b>(<var>method</var>)
+<dd>
+Factory function that creates a new Context object given an SSL method. The
+method should be <tt class="constant">SSLv2_METHOD</tt>, <tt class="constant">SSLv3_METHOD</tt>,
+<tt class="constant">SSLv23_METHOD</tt> or <tt class="constant">TLSv1_METHOD</tt>.
+</dl>
+<P>
+<dl><dt><b><a name='l2h-96'><tt>ConnectionType</tt></a></b>
+<dd>
+A Python type object representing the Connection object type.
+</dl>
+<P>
+<dl><dt><b><a name='l2h-97'><tt class='function'>Connection</tt></a></b>(<var>context, socket</var>)
+<dd>
+Factory fucnction that creates a new Connection object given an SSL context and
+a socket <A NAME="tex2html5"
+ HREF="#foot901"><SUP>4</SUP></A> object.
+</dl>
+<P>
+<dl><dt><b>exception <a name='l2h-98'><tt class='exception'>Error</tt></a></b>
+<dd>
+This exception is used as a base class for the other SSL-related
+exceptions, but may also be raised directly.
+</EM></EM></EM>
+<P>
+<EM><EM><EM>Whenever this exception is raised directly, it has a list of error messages
+from the OpenSSL error queue, where each item is a tuple <code>(<var>lib</var>,
+<var>function</var>, <var>reason</var>)</code>. Here <var>lib</var>, <var>function</var> and <var>reason</var>
+are all strings, describing where and what the problem is. See <span class='manpage'><i>err</i>(3)</span>
+for more information.
+</dl>
+<P>
+<dl><dt><b>exception <a name='l2h-99'><tt class='exception'>ZeroReturnError</tt></a></b>
+<dd>
+This exception matches the error return code <code>SSL_ERROR_ZERO_RETURN</code>, and
+is raised when the SSL Connection has been closed. In SSL 3.0 and TLS 1.0, this
+only occurs if a closure alert has occurred in the protocol, i.e. the
+connection has been closed cleanly. Note that this does not necessarily
+mean that the transport layer (e.g. a socket) has been closed.
+</EM></EM></EM>
+<P>
+<EM><EM><EM>It may seem a little strange that this is an exception, but it does match an
+<code>SSL_ERROR</code> code, and is very convenient.
+</dl>
+<P>
+<dl><dt><b>exception <a name='l2h-100'><tt class='exception'>WantReadError</tt></a></b>
+<dd>
+The operation did not complete; the same I/O method should be called again
+later, with the same arguments. Any I/O method can lead to this since new
+handshakes can occur at any time.
+</dl>
+<P>
+<dl><dt><b>exception <a name='l2h-101'><tt class='exception'>WantWriteError</tt></a></b>
+<dd>
+See <tt class="exception">WantReadError</tt>.
+</dl>
+<P>
+<dl><dt><b>exception <a name='l2h-102'><tt class='exception'>WantX509LookupError</tt></a></b>
+<dd>
+The operation did not complete because an application callback has asked to be
+called again. The I/O method should be called again later, with the same
+arguments. Note: This won't occur in this version, as there are no such
+callbacks in this version.
+</dl>
+<P>
+<dl><dt><b>exception <a name='l2h-103'><tt class='exception'>SysCallError</tt></a></b>
+<dd>
+The <tt class="exception">SysCallError</tt> occurs when there's an I/O error and OpenSSL's
+error queue does not contain any information. This can mean two things: An
+error in the transport protocol, or an end of file that violates the protocol.
+The parameter to the exception is always a pair <code>(<var>errnum</var>,
+<var>errstr</var>)</code>.
+</dl>
+<P>
+<BR><HR><H4>Footnotes</H4>
+<DL>
+<DT><A NAME="foot901">... socket</A><A
+ href="openssl-ssl.html#tex2html5"><SUP>4</SUP></A></DT>
+<DD>Actually, all that is required is an object that
+<i>behaves</i> like a socket, you could even use files, even though it'd be
+tricky to get the handshakes right!
+
+</DD>
+</DL>
+<p><hr>
+
+<!--Table of Child-Links-->
+<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
+
+<UL CLASS="ChildLinks">
+<LI><A NAME="tex2html263"
+ href="openssl-context.html">3.3.1 Context objects </A>
+<LI><A NAME="tex2html264"
+ href="openssl-connection.html">3.3.2 Connection objects </A>
+</UL>
+<!--End of Table of Child-Links-->
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+<b class="navlabel">Previous:</b> <a class="sectref" href="openssl-rand.html">3.2 rand </A>
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+<b class="navlabel">Next:</b> <a class="sectref" href="openssl-context.html">3.3.1 Context objects</A>
+<hr>
+<span class="release-info">Release 0.6.</span>
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