#!/usr/bin/perl
use strict;
use warnings;
use Digest::MD5;
use Math::BaseCalc;

my $md5_b64 = Digest::MD5->new;
$md5_b64->add( 'foo bar' );

my $md5_hex = Digest::MD5->new;
$md5_hex->add( 'foo bar' );

my $b64_digest   = $md5_b64->b64digest;
my $hex_digest   = $md5_hex->hexdigest;

my $base_64 = new Math::BaseCalc (
    digits => [ 'A' .. 'Z', 'a' .. 'z', 0 .. 9, '+' , '/' ]
);
my $base_16 = new Math::BaseCalc (
    digits => [ 0 .. 9, 'a' .. 'f' ]
);

my $b64_string   = $base_16->to_base( $base_64->from_base( $b64_digest ) );

print "Base 64   : $b64_digest\n";
print "Hex       : $hex_digest\n\n";
__END__
Base 64   : MntvB0NYESObxH4VRDUycw
Hex       : 327b6f07435811239bc47e1544353273

Converted : 327b6f074358120000000000000000000