Second pass at adding key files
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dsainty
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site/glist/templates/help/GT/MD5.html
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site/glist/templates/help/GT/MD5.html
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>GT::MD5 - Perl implementation of Ron Rivests MD5 Algorithm</title>
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<link rev="made" href="mailto:root@penguin.office.gossamer-threads.com" />
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</head>
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<body style="background-color: white">
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<p><a name="__index__"></a></p>
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<!-- INDEX BEGIN -->
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#disclaimer">DISCLAIMER</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#examples">EXAMPLES</a></li>
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<li><a href="#limitations">LIMITATIONS</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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<li><a href="#authors">AUTHORS</a></li>
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</ul>
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<!-- INDEX END -->
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<hr />
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<p>
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</p>
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<h1><a name="name">NAME</a></h1>
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<p>GT::MD5 - Perl implementation of Ron Rivests MD5 Algorithm</p>
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<p>
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</p>
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<hr />
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<h1><a name="disclaimer">DISCLAIMER</a></h1>
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<p>Majority of this module's code is borrowed from Digest::Perl::MD5 (Version 1.8).</p>
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<p>This is <strong>not</strong> an interface (like <code>Digest::MD5</code>) but a Perl implementation of MD5.
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It is written in perl only and because of this it is slow but it works without C-Code.
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You should use <code>Digest::MD5</code> instead of this module if it is available.
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This module is only usefull for</p>
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<dl>
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<dt></dt>
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<dd>
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computers where you cannot install <code>Digest::MD5</code> (e.g. lack of a C-Compiler)
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</dd>
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<p></p>
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<dt></dt>
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<dd>
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encrypting only small amounts of data (less than one million bytes). I use it to
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hash passwords.
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</dd>
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<p></p>
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<dt></dt>
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<dd>
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educational purposes
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</dd>
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<p></p></dl>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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# Functional style
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use Digest::MD5 qw(md5 md5_hex md5_base64);</pre>
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<pre>
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$hash = md5 $data;
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$hash = md5_hex $data;
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$hash = md5_base64 $data;</pre>
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<pre>
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# OO style
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use Digest::MD5;</pre>
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<pre>
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$ctx = Digest::MD5->new;</pre>
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<pre>
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$ctx->add($data);
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$ctx->addfile(*FILE);</pre>
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<pre>
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$digest = $ctx->digest;
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$digest = $ctx->hexdigest;
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$digest = $ctx->b64digest;</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>This modules has the same interface as the much faster <code>Digest::MD5</code>. So you can
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easily exchange them, e.g.</p>
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<pre>
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BEGIN {
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eval {
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require Digest::MD5;
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import Digest::MD5 'md5_hex'
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};
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if ($@) { # ups, no Digest::MD5
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require Digest::Perl::MD5;
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import Digest::Perl::MD5 'md5_hex'
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}
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}</pre>
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<p>If the <code>Digest::MD5</code> module is available it is used and if not you take
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<code>Digest::Perl::MD5</code>.</p>
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<p>You can also install the Perl part of Digest::MD5 together with Digest::Perl::MD5
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and use Digest::MD5 as normal, it falls back to Digest::Perl::MD5 if it
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cannot load its object files.</p>
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<p>For a detailed Documentation see the <code>Digest::MD5</code> module.</p>
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<p>
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</p>
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<hr />
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<h1><a name="examples">EXAMPLES</a></h1>
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<p>The simplest way to use this library is to import the <code>md5_hex()</code>
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function (or one of its cousins):</p>
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<pre>
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use Digest::Perl::MD5 'md5_hex';
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print 'Digest is ', md5_hex('foobarbaz'), "\n";</pre>
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<p>The above example would print out the message</p>
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<pre>
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Digest is 6df23dc03f9b54cc38a0fc1483df6e21</pre>
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<p>provided that the implementation is working correctly. The same
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checksum can also be calculated in OO style:</p>
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<pre>
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use Digest::MD5;
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$md5 = Digest::MD5->new;
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$md5->add('foo', 'bar');
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$md5->add('baz');
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$digest = $md5->hexdigest;
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print "Digest is $digest\n";</pre>
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<p>The digest methods are destructive. That means you can only call them
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once and the $md5 objects is reset after use. You can make a copy with clone:</p>
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<pre>
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$md5->clone->hexdigest</pre>
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<p>
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</p>
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<hr />
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<h1><a name="limitations">LIMITATIONS</a></h1>
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<p>This implementation of the MD5 algorithm has some limitations:</p>
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<dl>
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<dt></dt>
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<dd>
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It's slow, very slow. I've done my very best but Digest::MD5 is still about 100 times faster.
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You can only encrypt Data up to one million bytes in an acceptable time. But it's very usefull
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for encrypting small amounts of data like passwords.
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</dd>
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<p></p>
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<dt></dt>
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<dd>
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You can only encrypt up to 2^32 bits = 512 MB on 32bit archs. But You should
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use <code>Digest::MD5</code> for those amounts of data anyway.
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</dd>
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<p></p></dl>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><a href="glist.cgi?do=admin_gtdoc&topic=/Digest/MD5.html">the Digest::MD5 manpage</a></p>
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<p><em>md5(1)</em></p>
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<p>RFC 1321</p>
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<p>tools/md5: a small BSD compatible md5 tool written in pure perl.</p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>This library is free software; you can redistribute it and/or
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modify it under the same terms as Perl itself.</p>
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<pre>
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Copyright 2000 Christian Lackas, Imperia Software Solutions
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Copyright 1998-1999 Gisle Aas.
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Copyright 1995-1996 Neil Winton.
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Copyright 1991-1992 RSA Data Security, Inc.</pre>
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<p>The MD5 algorithm is defined in RFC 1321. The basic C code
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implementing the algorithm is derived from that in the RFC and is
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covered by the following copyright:</p>
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<dl>
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<dt></dt>
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<dd>
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Copyright (C) 1991-1992, RSA Data Security, Inc. Created 1991. All
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rights reserved.
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</dd>
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<dd>
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<p>License to copy and use this software is granted provided that it
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is identified as the ``RSA Data Security, Inc. MD5 Message-Digest
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Algorithm'' in all material mentioning or referencing this software
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or this function.</p>
|
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</dd>
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<dd>
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||||
<p>License is also granted to make and use derivative works provided
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that such works are identified as ``derived from the RSA Data
|
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Security, Inc. MD5 Message-Digest Algorithm'' in all material
|
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mentioning or referencing the derived work.</p>
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</dd>
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<dd>
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<p>RSA Data Security, Inc. makes no representations concerning either
|
||||
the merchantability of this software or the suitability of this
|
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software for any particular purpose. It is provided ``as is''
|
||||
without express or implied warranty of any kind.</p>
|
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</dd>
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||||
<dd>
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||||
<p>These notices must be retained in any copies of any part of this
|
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documentation and/or software.</p>
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</dd>
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<p></p></dl>
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||||
<p>This copyright does not prohibit distribution of any version of Perl
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containing this extension under the terms of the GNU or Artistic
|
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licenses.</p>
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<p>
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</p>
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<hr />
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<h1><a name="authors">AUTHORS</a></h1>
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<p>The original MD5 interface was written by Neil Winton
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(<N.Winton (at) axion.bt.co.uk>).</p>
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<p><code>Digest::MD5</code> was made by Gisle Aas <gisle (at) aas.no> (I took his Interface
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and part of the documentation).</p>
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<p>Thanks to Guido Flohr for his 'use integer'-hint.</p>
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<p>This release was made by Christian Lackas <delta (at) lackas.net>.</p>
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</body>
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</html>
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