1Twofish(3)            User Contributed Perl Documentation           Twofish(3)
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NAME

6       Crypt::Twofish - The Twofish Encryption Algorithm
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SYNOPSIS

9       use Crypt::Twofish;
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11       $cipher = Crypt::Twofish->new($key);
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13       $ciphertext = $cipher->encrypt($plaintext);
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15       $plaintext  = $cipher->decrypt($ciphertext);
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DESCRIPTION

18       Twofish is a 128-bit symmetric block cipher with a variable length
19       (128, 192, or 256-bit) key, developed by Counterpane Labs. It is
20       unpatented and free for all uses, as described at
21       <URL:http://www.counterpane.com/twofish.html>.
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23       This module implements Twofish encryption. It supports the Crypt::CBC
24       interface, with the functions described below. It also provides an
25       interface that is call-compatible with Crypt::Twofish 1.0, but its use
26       in new code is strongly discouraged.
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28   Functions
29       blocksize
30           Returns the size (in bytes) of the block (16, in this case).
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32       keysize
33           Returns the size (in bytes) of the key. Although the module
34           understands 128, 192, and 256-bit keys, it returns 16 for
35           compatibility with Crypt::CBC.
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37       new($key)
38           This creates a new Crypt::Twofish object with the specified key
39           (which should be 16, 24, or 32 bytes long).
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41       encrypt($data)
42           Encrypts blocksize() bytes of $data and returns the corresponding
43           ciphertext.
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45       decrypt($data)
46           Decrypts blocksize() bytes of $data and returns the corresponding
47           plaintext.
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SEE ALSO

50       Crypt::CBC, Crypt::Blowfish, Crypt::TEA
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ACKNOWLEDGEMENTS

53       Nishant Kakani
54           For writing Crypt::Twofish 1.0 (this version is a complete
55           rewrite).
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57       Tony Cook
58           For making the module work under Activeperl, testing on several
59           platforms, and suggesting that I probe for features via %Config.
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AUTHOR

62       Abhijit Menon-Sen <ams@toroid.org>
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64       Copyright 2001 Abhijit Menon-Sen.
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66       This module is free software; you can redistribute it and/or modify it
67       under the same terms as Perl itself.
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71perl v5.12.0                      2010-05-08                        Twofish(3)