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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>.
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