Twofish(3pm)						User Contributed Perl Documentation					      Twofish(3pm)

NAME

       Crypt::Twofish - The Twofish Encryption Algorithm

SYNOPSIS

       use Crypt::Twofish;

       $cipher = Crypt::Twofish->new($key);

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

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

DESCRIPTION

       Twofish is a 128-bit symmetric block cipher with a variable length (128, 192, or 256-bit) key, developed by Counterpane Labs. It is
       unpatented and free for all uses, as described at <URL:http://www.counterpane.com/twofish.html>.

       This module implements Twofish encryption. It supports the Crypt::CBC interface, with the functions described below. It also provides an
       interface that is call-compatible with Crypt::Twofish 1.0, but its use in new code is strongly discouraged.

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

       keysize
	   Returns the size (in bytes) of the key. Although the module understands 128, 192, and 256-bit keys, it returns 16 for compatibility
	   with Crypt::CBC.

       new($key)
	   This creates a new Crypt::Twofish object with the specified key (which should be 16, 24, or 32 bytes long).

       encrypt($data)
	   Encrypts blocksize() bytes of $data and returns the corresponding ciphertext.

       decrypt($data)
	   Decrypts blocksize() bytes of $data and returns the corresponding plaintext.

SEE ALSO

       Crypt::CBC, Crypt::Blowfish, Crypt::TEA

ACKNOWLEDGEMENTS

       Nishant Kakani
	   For writing Crypt::Twofish 1.0 (this version is a complete rewrite).

       Tony Cook
	   For making the module work under Activeperl, testing on several platforms, and suggesting that I probe for features via %Config.

AUTHOR

       Abhijit Menon-Sen <ams@wiw.org>

       Copyright 2001 Abhijit Menon-Sen. All rights reserved.

       This software is distributed under the terms of the Artistic License <URL:http://ams.wiw.org/code/artistic.txt>.

perl v5.14.2							    2001-05-21							      Twofish(3pm)