This is not C-code interface (like `Digest::MD5') but a Perl-only
implementation of MD4 (like `Digest::Perl::MD5'). Because of this, it is
slow but avoids platform specific complications. For efficiency you
should use `Digest::MD4' instead of this module if it is available.

WWW: http://search.cpan.org/dist/Digest-Perl-MD4/