Crypt::Square - Crypt::CBC-compliant block cipher
use Crypt::Square;
$cipher = new Crypt::Square $key;
$ciphertext = $cipher->encrypt($plaintext);
$plaintext = $cipher->decrypt($ciphertext);
Square is a 128-bit block cipher that accepts a 128-bit key. Designed by Joan Daemen, Vincent Rijmen, and Lars Knudsen, Square is the predecessor of Rijndael, aka the Advanced Encryption Standard.
This module supports the Crypt::CBC interface, with the following functions.
Returns the size (in bytes) of the block (16, in this case).
Returns the size (in bytes) of the key (16, in this case).
Encrypts 16 bytes of $data and returns the corresponding ciphertext.
Decrypts 16 bytes of $data and returns the corresponding plaintext.
#!/usr/local/bin/perl
use diagnostics;
use strict;
use warnings;
use Crypt::Square;
# key must be 16 bytes long
my $key = "0123456789abcdef";
my $cipher = new Crypt::Square $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);
#!/usr/local/bin/perl
use diagnostics;
use strict;
use warnings;
use Crypt::CBC; # CBC automatically loads Square 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' => 'Square',
'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, and Crypt::Camellia.
Note that this implementation has been rigged and tested only on the Intel platform, and thus, it could give wrong results for non-Intel processors.
Copyright 2003 by Julius C. Duque <jcduque (AT) lycos (DOT) com>
This library is free software; you can redistribute it and/or modify it under the same terms as the GNU General Public License.
