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#!/usr/local/bin/perl

use diagnostics;
use strict;
use warnings;
use Crypt::CBC;    # CBC automatically loads Shark for us

my $key = pack "H32", "00112233445566778899aabbccddeeff";
my $IV = pack "H16", "123456789abcdef0";

my $cipher = Crypt::CBC->new({'key' => $key,
                              'cipher' => 'Shark',
                              'iv' => $IV,
                              'regenerate_key' => 1,
                              'padding' => 'standard',
                              'prepend_iv' => 0
                            });

my $plaintext1 = pack "H16", "123456789abcdef";
print "plaintext1  : ", unpack("H*", $plaintext1), "\n";

my $ciphertext1 = $cipher->encrypt($plaintext1);
print "ciphertext1 : ", unpack("H*", $ciphertext1), "\n";

my $plaintext2 = $cipher->decrypt($ciphertext1);
print "plaintext2  : ", unpack("H*", $plaintext2), "\n";