crypt::des(3) [suse man page]

DES(3)							User Contributed Perl Documentation						    DES(3)

NAME

       Crypt::DES - Perl DES encryption module

SYNOPSIS

	   use Crypt::DES;

DESCRIPTION

       The module implements the Crypt::CBC interface, which has the following methods

       blocksize =item keysize =item encrypt =item decrypt

FUNCTIONS

       blocksize
	   Returns the size (in bytes) of the block cipher.

       keysize
	   Returns the size (in bytes) of the key. Optimal size is 8 bytes.

       new
		   my $cipher = new Crypt::DES $key;

	   This creates a new Crypt::DES BlockCipher object, using $key, where $key is a key of "keysize()" bytes.

       encrypt
		   my $cipher = new Crypt::DES $key;
		   my $ciphertext = $cipher->encrypt($plaintext);

	   This function encrypts $plaintext and returns the $ciphertext where $plaintext and $ciphertext should be of "blocksize()" bytes.

       decrypt
		   my $cipher = new Crypt::DES $key;
		   my $plaintext = $cipher->decrypt($ciphertext);

	   This function decrypts $ciphertext and returns the $plaintext where $plaintext and $ciphertext should be of "blocksize()" bytes.

EXAMPLE

	       my $key = pack("H16", "0123456789ABCDEF");
	       my $cipher = new Crypt::DES $key;
	       my $ciphertext = $cipher->encrypt("plaintex");  # NB - 8 bytes
	       print unpack("H16", $ciphertext), "
";

NOTES

       Do note that DES only uses 8 byte keys and only works on 8 byte data blocks.  If you're intending to encrypt larger blocks or entire files,
       please use Crypt::CBC in conjunction with this module.  See the Crypt::CBC documentation for proper syntax and use.

       Also note that the DES algorithm is, by today's standard, weak encryption.  Crypt::Blowfish is highly recommended if you're interested in
       using strong encryption and a faster algorithm.

SEE ALSO

       Crypt::Blowfish Crypt::IDEA

       Bruce Schneier, Applied Cryptography, 1995, Second Edition, published by John Wiley & Sons, Inc.

COPYRIGHT

       The implementation of the DES algorithm was developed by, and is copyright of, Eric Young (eay@mincom.oz.au).  Other parts of the perl
       extension and module are copyright of Systemics Ltd ( http://www.systemics.com/ ).  Cross-platform work and packaging for single algorithm
       distribution is copyright of W3Works, LLC.

MAINTAINER

       This single-algorithm package and cross-platform code is maintained by Dave Paris <amused@pobox.com>.

perl v5.12.1							    2005-12-08								    DES(3)

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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)

Linux and UNIX Man Pages

crypt::des(3) [suse man page]

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