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

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 v5.14.2							    2009-12-10							     Rijndael(3pm)