This is not an answer, sorry. I searched CPAN and found many modules dealing with Digest; the most common ones (MD2, MD4, MD5, SHA-1) produce strings longer than 20 bytes... Here is the code I used to test it:

#!/usr/bin/perl
use strict;
use Digest;

my $data = "message to be digested";

for ('MD2', 'MD4', 'MD5', 'SHA-1') {
  showme($_, Digest->new($_), $data);
}

exit;

sub showme {

  my ($mode, $digest, $data) = @_;

  $digest->add($data);
  print "Digest::$mode\n";
  print "binary (length): ", length($digest->digest), "\n";
  print "hex            : ", $digest->hexdigest, "\n";
  if ($digest->can('b64digest')) {
    print "base64         : ", $digest->b64digest, "\n";
  }
  print "\n";
}

__END__

# output
Digest::MD2
binary (length): 16
hex            : 8350e5a3e24c153df2275c9f80692773
base64         : g1Dlo+JMFT3yJ1yfgGkncw

Digest::MD4
binary (length): 16
hex            : 0962f09cec91822209796b504862847b

Digest::MD5
binary (length): 16
hex            : d41d8cd98f00b204e9800998ecf8427e
base64         : 1B2M2Y8AsgTpgAmY7PhCfg

Digest::SHA-1
binary (length): 20
hex            : da39a3ee5e6b4b0d3255bfef95601890afd80709
base64         : 2jmj7l5rSw0yVb/vlWAYkK/YBwk

[download]

Given these digest methods, only binary format seems suitable for your needs... does anybody know of other algorithms?

Ciao, Valerio

In reply to Re: Alternative Perl encryption module by valdez
in thread Alternative Perl encryption module by Anonymous Monk

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