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Man Pages


Manual Reference Pages  -  CRYPT::SHARK (3)

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NAME

Crypt::Shark - Crypt::CBC compliant block cipher

CONTENTS

ABSTRACT

Shark is 64-bit block cipher that accepts a 128-bit key.

SYNOPSIS



    use Crypt::Shark;

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



DESCRIPTION

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.

    Functions

<B>blocksizeB> Returns the size (in bytes) of the block (8, in this case).
<B>keysizeB> Returns the size (in bytes) of the key (16, in this case).
<B>encrypt($data)B> Encrypts 8 bytes of $data and returns the corresponding ciphertext.
<B>decrypt($data)B> Decrypts 8 bytes of $data and returns the corresponding plaintext.

EXAMPLE 1



    #!/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);



EXAMPLE 2



    #!/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);



MORE EXAMPLES

See <B>Crypt::CBCB> for more examples using CBC mode. See also the examples and t directories for some more examples.

SEE ALSO

<B>Crypt::KhazadB>, <B>Crypt::Misty1B>, <B>Crypt::AnubisB>, <B>Crypt::NoekeonB>, <B>Crypt::SkipjackB>, <B>Crypt::CamelliaB>, <B>Crypt::SquareB>, and <B>Crypt::RainbowB>.

COPYRIGHT AND LICENSE

Copyright 2003 by Julius C. Duque. Please read <B>contact.htmlB> 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.

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perl v5.20.3 SHARK (3) 2003-06-30

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