NAME

Crypt::Loki97 - Crypt::CBC compliant block cipher

SYNOPSIS

use Crypt::Loki97;

$cipher = new Crypt::Loki97 $key;
$ciphertext = $cipher->encrypt($plaintext);
$plaintext  = $cipher->decrypt($ciphertext);

DESCRIPTION

Loki97 is 128-bit block cipher that accepts a variable-length key. It was designed by Lawrie Brown, Josef Pieprzyk, and Jennifer Seberry.

The default key length in this implementation is 128 bits.

Loki97 was one of the 15 candidates for the AES.

This module supports the Crypt::CBC interface, with the following functions.

Functions

blocksize

Returns the size (in bytes) of the block (16, in this case).

keysize

Returns the size (in bytes) of the key (16, in this case).

encrypt($data)

Encrypts 16 bytes of $data and returns the corresponding ciphertext.

decrypt($data)

Decrypts 16 bytes of $data and returns the corresponding plaintext.

EXAMPLE 1

#!/usr/local/bin/perl

use diagnostics;
use strict;
use warnings;
use Crypt::Loki97;

# key must be 16 bytes long
my $key = "0123456789abcdef";

my $cipher = new Crypt::Loki97 $key;

print "blocksize = ", $cipher->blocksize, " bytes \n";
print "keysize = ", $cipher->keysize, " bytes \n";

# block must be 16 bytes long
my $plaintext1 = "0123456789abcdef";

my $ciphertext = $cipher->encrypt($plaintext1);
my $plaintext2 = $cipher->decrypt($ciphertext);

print "Decryption OK\n" if ($plaintext1 eq $plaintext2);

EXAMPLE 2

#!/usr/local/bin/perl

use diagnostics;
use strict;
use warnings;
use Crypt::CBC;  # CBC automatically loads Loki97 for us

# when using Crypt::CBC, key may be of ANY length
my $key = "0123456789abcdef";

# IV must be exactly 16 bytes long
my $IV = pack "H32", 0;

my $cipher = Crypt::CBC->new({'key' => $key,
                              'cipher' => 'Loki97',
                              'iv' => $IV,
                              'regenerate_key' => 1,
                              'padding' => 'standard',
                              'prepend_iv' => 0
                            });

# when using Crypt::CBC, plaintext may be of ANY length
my $plaintext1 = "This is a test";

my $ciphertext = $cipher->encrypt($plaintext1);
my $plaintext2 = $cipher->decrypt($ciphertext);

print "Decryption OK\n" if ($plaintext1 eq $plaintext2);

MORE EXAMPLES

See Crypt::CBC for more examples using CBC mode. See also the "examples" and "t" directories for some more examples.

SEE ALSO

Crypt::Khazad, Crypt::Misty1, Crypt::Anubis, Crypt::Noekeon, Crypt::Skipjack, Crypt::Camellia, Crypt::Square, Crypt::Rainbow, and Crypt::Shark.

COPYRIGHT AND LICENSE

Copyright 2003 by Julius C. Duque. Please read contact.html that comes with this distribution for details on how to contact the author.

This library is free software; you can redistribute it and/or modify it under the same terms as the GNU General Public License.