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<H1><A NAME="SECTION0017000000000000000000"></A>
<A NAME="crypto"></A><a id='l2h-4801' xml:id='l2h-4801'></a>
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15. Cryptographic Services
</H1>

<P>
The modules described in this chapter implement various algorithms of
a cryptographic nature.  They are available at the discretion of the
installation.  Here's an overview:

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      <td><b><tt class='module'><a href='module-hmac.html'>hmac</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>Keyed-Hashing for Message Authentication (HMAC)
                implementation for Python.</td></tr>
  <tr><td><b><tt class='module'><a href='module-md5.html'>md5</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>RSA's MD5 message digest algorithm.</td></tr>
  <tr class='oddrow'>
      <td><b><tt class='module'><a href='module-sha.html'>sha</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>NIST's secure hash algorithm, SHA.</td></tr>
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<P>
Hardcore cypherpunks will probably find the cryptographic modules
written by A.M. Kuchling of further interest; the package adds
built-in modules for DES and IDEA encryption, provides a Python module
for reading and decrypting PGP files, and then some.  These modules
are not distributed with Python but available separately.  See the URL
<a class="url" href="http://www.amk.ca/python/code/crypto.html">http://www.amk.ca/python/code/crypto.html</a>
for more information.
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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