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

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 $b16_string = Math::Fleximal->new (
    $b64_digest , [ 'A'..'Z', 'a'..'z', '0'..'9', '+', '/']
    )->change_flex ( [ 0..9, 'a'..'f' ] )->to_str()
;

print "Base 64   : $b64_digest\n";
print "Hex       : $hex_digest\n\n";
print "Converted : ", substr($b16_string, 0, 32), "\n";
__END__
Base 64   : MntvB0NYESObxH4VRDUycw
Hex       : 327b6f07435811239bc47e1544353273

Converted : 327b6f07435811239bc47e1544353273