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Crypt::Anubis
Crypt::CBC-compliant block cipher

Crypt::Anubis - Crypt::CBC-compliant block cipher


NAME

Crypt::Anubis - Crypt::CBC-compliant block cipher


ABSTRACT

Anubis is a variable-length key, 128-bit block cipher designed by Vincent Rijmen and Paulo S. L. M. Barreto.


SYNOPSIS


    use Crypt::Anubis;

    $cipher = new Crypt::Anubis $key;

    $ciphertext = $cipher->encrypt($plaintext);

    $plaintext  = $cipher->decrypt($ciphertext);


DESCRIPTION

Anubis is a variable-length key, 128-bit block cipher designed by Vincent Rijmen and Paulo S. L. M. Barreto. Key length can be 128, 160, 192, 224, 256, 288, or 320 bits. The default key length used in this implementation is 128 bits (16 bytes).

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::Anubis;

    # key must be 16 bytes long

    my $key = "0123456789abcdef";

    my $cipher = new Crypt::Anubis $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 Anubis 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' => 'Anubis',

                                  '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 and Crypt::Misty1


COPYRIGHT AND LICENSE

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.

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