Crypt::Shark - Crypt::CBC compliant block cipher
Shark is 64-bit block cipher that accepts a 128-bit key.
use Crypt::Shark;
$cipher = new Crypt::Shark $key;
$ciphertext = $cipher->encrypt($plaintext);
$plaintext = $cipher->decrypt($ciphertext);
Shark is 64-bit block cipher that accepts a 128-bit key. It was designed by Vincent Rijmen, Joan Daemen, Bart Preneel, Antoon Bosselaers, and Erik De Win.
This module supports the Crypt::CBC interface, with the following functions.
Returns the size (in bytes) of the block (8, in this case).
Returns the size (in bytes) of the key (16, in this case).
Encrypts 8 bytes of $data and returns the corresponding ciphertext.
Decrypts 8 bytes of $data and returns the corresponding plaintext.
#!/usr/local/bin/perl
use diagnostics;
use strict;
use warnings;
use Crypt::Shark;
# key must be 16 bytes long
my $key = "0123456789abcdef";
my $cipher = new Crypt::Shark $key;
print "blocksize = ", $cipher->blocksize, " bytes \n";
print "keysize = ", $cipher->keysize, " bytes \n";
# block must be 8 bytes long
my $plaintext1 = "01234567";
my $ciphertext = $cipher->encrypt($plaintext1);
my $plaintext2 = $cipher->decrypt($ciphertext);
print "Decryption OK\n" if ($plaintext1 eq $plaintext2);
#!/usr/local/bin/perl
use diagnostics;
use strict;
use warnings;
use Crypt::CBC; # CBC automatically loads Shark 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 "H16", 0;
my $cipher = Crypt::CBC->new({'key' => $key,
'cipher' => 'Shark',
'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);
See Crypt::CBC for more examples using CBC mode. See also the "examples" and "t" directories for some more examples.
Crypt::Khazad, Crypt::Misty1, Crypt::Anubis, Crypt::Noekeon, Crypt::Skipjack, Crypt::Camellia, Crypt::Square, and Crypt::Rainbow.
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.
