crypt::des(3pm) [debian man page]

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

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 v5.14.2							    2005-12-08								  DES(3pm)

CAST5(3pm)						User Contributed Perl Documentation						CAST5(3pm)

NAME

       Crypt::CAST5 - CAST5 block cipher

SYNOPSIS

	   use Crypt::CBC;

	   my $crypt = Crypt::CBC->new({
	       key    => "secret key",
	       cipher => "CAST5",
	   });

	   my $message = "All mimsy were the borogoves";
	   my $ciphertext = $crypt->encrypt($message);
	   print unpack("H*", $ciphertext), "
";

	   my $plaintext = $crypt->decrypt($ciphertext);
	   print $plaintext, "
";

DESCRIPTION

       This module provides an implementation of the CAST5 block cipher using compiled C code for increased speed. CAST5 is also known as
       CAST-128. It is a product of the CAST design procedure developed by C. Adams and S. Tavares.

       The CAST5 cipher is available royalty-free.

FUNCTIONS

   blocksize
       Returns the CAST5 block size, which is 8 bytes. This function exists so that Crypt::CAST5 can work with Crypt::CBC.

   keysize
       Returns the maximum CAST5 key size, 16 bytes.

   new
	   $cast5 = Crypt::CAST5->new($key);

       Create a new encryption object. If the optional key parameter is given, it will be passed to the init() function.

   init
	   $cast5->init($key);

       Set or change the encryption key to be used. The key must be from 40 bits (5 bytes) to 128 bits (16 bytes) in length. Note that if the key
       used is 80 bits or less, encryption and decryption will be somewhat faster.

       It is best for the key to be random binary data, not something printable like a password. A message digest function may be useful for
       converting a password to an encryption key; see Digest::SHA1 or Digest::MD5.  Note that Crypt::CBC runs the given "key" through MD5 to get
       the actual encryption key.

   encrypt
	   $ciphertext = $cast5->encrypt($plaintext);

       Encrypt a block of plaintext using the current encryption key, and return the corresponding ciphertext. The input must be 8 bytes long, and
       the output has the same length. Note that the encryption is in ECB mode, which means that it encrypts each block independently. That can
       leave you vulnerable to dictionary attacks, so it is generally best to use some form of chaining between blocks; see Crypt::CBC.

   decrypt
	   $plaintext = $cast5->decrypt($ciphertext);

       Decrypt the ciphertext and return the corresponding plaintext.

SEE ALSO

       RFC 2144, "The CAST-128 Encryption Algorithm", C. Adams, May 1997

       Crypt::CBC

AUTHOR

       Bob Mathews, <bobmathews@alumni.calpoly.edu>

COPYRIGHT AND LICENSE

       Copyright (C) 2002-2006 Bob Mathews

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

perl v5.14.2							    2006-07-01								CAST5(3pm)