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dfeichti |
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#!/usr/bin/perl
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################################################################
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# crypttest.pl
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#
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# Version info: $Id: crypttest.pl,v 1.2 2007/02/01 23:44:38 feichtinger Exp $
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################################################################
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use Crypt::CBC;
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use Carp;
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use Getopt::Std;
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use MIME::Base64;
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use strict;
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#####################################################
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# PARAMETERS
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#
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# we use a 56 byte key
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my $key = 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabde';
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#####################################################
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sub usage {
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print <<"EOF";
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usage: crypttest.pl -d/-e [-i iv-vector] "message"
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options:
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-e : encrypt
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-d : decrypt
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-i iv-vector : provide a 8 byte init vector for encryption
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EOF
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}
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my $iv;
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my $mode='e';
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# OPTION PARSING
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my %option=();
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getopts("edhi:",\%option);
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if (defined $option{h}) {
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usage();
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exit(0);
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}
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if (defined $option{e}) {
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$mode='e';
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}
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if (defined $option{d}) {
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$mode='d';
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}
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if (defined $option{i}) {
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$iv = $option{i};
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} else {
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$iv = Crypt::CBC->random_bytes(8);
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}
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my $text = shift;
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die "Error: No text given" if ! $text;
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die "Error: IV needs to have length = 8 " if length($iv) != 8;
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my $cipher = Crypt::CBC->new( -cipher => 'Blowfish',
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-literal_key => 1,
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-key => $key,
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-iv => $iv,
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-header => 'none',
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-blocksize => 8,
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-keysize => 56
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-padding => 'standard'
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);
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if ($mode eq 'e') {
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my $encr = encrypt($text);
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print ">$encr<\n";
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#print "Control check: Decrypted: " . decrypt($encr) . "\n";
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} else {
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print ">" . decrypt($text) . "<\n";
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}
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exit 0;
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# we prepend the iv to the encryption
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sub encrypt {
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my $plain = shift;
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my $encr = $iv . $cipher->encrypt($plain);
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my $encr64 = encode_base64($encr);
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chomp($encr64);
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return $encr64
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}
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sub decrypt {
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my $encr64 = shift;
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my $encr = decode_base64($encr64);
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my $iv = substr($encr,0,8,"");
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$cipher->set_initialization_vector($iv);
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my $decr = $cipher->decrypt($encr);
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return $decr;
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}
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