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<a href="Crypto-module.html">Package Crypto</a> ::
Package Hash
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<!-- ==================== PACKAGE DESCRIPTION ==================== -->
<h1 class="epydoc">Package Hash</h1><p class="nomargin-top"></p>
<p>Hashing algorithms</p>
<p>Hash functions take arbitrary binary strings as input, and produce a random-like output
of fixed size that is dependent on the input; it should be practically infeasible
to derive the original input data given only the hash function's
output. In other words, the hash function is <em>one-way</em>.</p>
<p>It should also not be practically feasible to find a second piece of data
(a <em>second pre-image</em>) whose hash is the same as the original message
(<em>weak collision resistance</em>).</p>
<p>Finally, it should not be feasible to find two arbitrary messages with the
same hash (<em>strong collision resistance</em>).</p>
<p>The output of the hash function is called the <em>digest</em> of the input message.
In general, the security of a hash function is related to the length of the
digest. If the digest is <em>n</em> bits long, its security level is roughly comparable
to the the one offered by an <em>n/2</em> bit encryption algorithm.</p>
<p>Hash functions can be used simply as a integrity check, or, in
association with a public-key algorithm, can be used to implement
digital signatures.</p>
<p>The hashing modules here all support the interface described in <a class="rst-reference external" href="http://www.python.org/dev/peps/pep-0247/" target="_top">PEP
247</a> , "API for Cryptographic Hash Functions".</p>
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<li> <strong class="uidlink"><a href="Crypto.Hash.HMAC-module.html">Crypto.Hash.HMAC</a></strong>: <em class="summary">HMAC (Hash-based Message Authentication Code) algorithm</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.MD2-module.html">Crypto.Hash.MD2</a></strong>: <em class="summary">MD2 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.MD4-module.html">Crypto.Hash.MD4</a></strong>: <em class="summary">MD4 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.MD5-module.html">Crypto.Hash.MD5</a></strong>: <em class="summary">MD5 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.RIPEMD-module.html">Crypto.Hash.RIPEMD</a></strong>: <em class="summary">RIPEMD-160 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.SHA-module.html">Crypto.Hash.SHA</a></strong>: <em class="summary">SHA-1 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.SHA224-module.html">Crypto.Hash.SHA224</a></strong>: <em class="summary">SHA-224 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.SHA256-module.html">Crypto.Hash.SHA256</a></strong>: <em class="summary">SHA-256 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.SHA384-module.html">Crypto.Hash.SHA384</a></strong>: <em class="summary">SHA-384 cryptographic hash algorithm.</em> </li>
<li> <strong class="uidlink"><a href="Crypto.Hash.SHA512-module.html">Crypto.Hash.SHA512</a></strong>: <em class="summary">SHA-512 cryptographic hash algorithm.</em> </li>
<li class="private"> <strong class="uidlink"><a href="Crypto.Hash.hashalgo-module.html" onclick="show_private();">Crypto.Hash.hashalgo</a></strong> </li>
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