Rijndael(3)	      User Contributed Perl Documentation	   Rijndael(3)

NAME
       Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption module

SYNOPSIS
	use Crypt::Rijndael;

	# keysize() is 32, but 24 and 16 are also possible
	# blocksize() is 16

	$cipher = Crypt::Rijndael->new( "a" x 32, Crypt::Rijndael::MODE_CBC() );

	$cipher->set_iv($iv);
	$crypted = $cipher->encrypt($plaintext);
	       # - OR -
	$plaintext = $cipher->decrypt($crypted);

DESCRIPTION
       This module implements the Rijndael cipher, which has just been
       selected as the Advanced Encryption Standard.

       keysize
	   Returns the keysize, which is 32 (bytes). The Rijndael cipher
	   actually supports keylengths of 16, 24 or 32 bytes, but there is no
	   way to communicate this to "Crypt::CBC".

       blocksize
	   The blocksize for Rijndael is 16 bytes (128 bits), although the
	   algorithm actually supports any blocksize that is any multiple of
	   our bytes.  128 bits, is however, the AES-specified block size, so
	   this is all we support.

       $cipher = Crypt::Rijndael->new( $key [, $mode] )
	   Create a new "Crypt::Rijndael" cipher object with the given key
	   (which must be 128, 192 or 256 bits long). The additional $mode
	   argument is the encryption mode, either "MODE_ECB" (electronic
	   codebook mode, the default), "MODE_CBC" (cipher block chaining, the
	   same that "Crypt::CBC" does), "MODE_CFB" (128-bit cipher feedback),
	   "MODE_OFB" (128-bit output feedback), or "MODE_CTR" (counter mode).

	   ECB mode is very insecure (read a book on cryptography if you dont
	   know why!), so you should probably use CBC mode.

       $cipher->set_iv($iv)
	   This allows you to change the initial value vector used by the
	   chaining modes.  It is not relevant for ECB mode.

       $cipher->encrypt($data)
	   Encrypt data. The size of $data must be a multiple of "blocksize"
	   (16 bytes), otherwise this function will croak. Apart from that, it
	   can be of (almost) any length.

       $cipher->decrypt($data)
	   Decrypts $data.

   Encryption modes
       Use these constants to select the cipher type:

       MODE_CBC - Cipher Block Chaining
       MODE_CFB - Cipher feedback
       MODE_CTR - Counter mode
       MODE_ECB - Electronic cookbook mode
       MODE_OFB - Output feedback
       MODE_PCBC - ignore this one for now :)

SEE ALSO
       Crypt::CBC, http://www.csrc.nist.gov/encryption/aes/

BUGS
       Should EXPORT or EXPORT_OK the MODE constants.

AUTHOR
       Currently maintained by brian d foy, "<bdfoy@cpan.org>".

       Original code by	 Rafael R. Sevilla.

       The Rijndael Algorithm was developed by Vincent Rijmen and Joan Daemen,
       and has been selected as the US Government's Advanced Encryption
       Standard.

SOURCE
       This code is in Github:

	       git://github.com/briandfoy/crypt-rijndael.git

LICENSE
       This software is licensed under the Lesser GNU Public License. See the
       included COPYING file for details.

perl v5.14.1			  2010-01-17			   Rijndael(3)

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