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@toroid.org>

       Copyright 2001 Abhijit Menon-Sen.

       This module is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.