---
name: "Crypt::Twofish"
section: "3pm"
platform: "linux"
package: "libcrypt-twofish-perl"
version: "2.18-1+b5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Crypt::Twofish"
---

# Crypt::Twofish(3pm)

The Twofish Encryption Algorithm

## 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.