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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), "\n";

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 v5.16.3				    2005-12-08					   DES(3)
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