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Digest::Perl::MD5
http://search.cpan.org/author/DELTA/Digest-Perl-MD5-1.5/lib/Digest/Perl/MD5.pm

DISCLAIMER
This is not an interface (like Digest::MD5) but a Perl implementation of MD5. It is written in perl only and because of this it is slow but it works without C-Code. You should use Digest::MD5 instead of this module if it is available. This module is only usefull for

computers where you cannot install Digest::MD5 (e.g. lack of a C-Compiler)
encrypting only small amounts of data (less than one million bytes). I use it to hash passwords.
educational purposes