NAME
Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption module
VERSION
Version 1.14
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 don't
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 Leon Timmermans "
[email protected]".
Previously maintained by brian d foy, "<
[email protected]>".
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/leont/crypt-rijndael.git
LICENSE
This software is licensed under the Lesser GNU Public License v3 (29
June 2007). See the included COPYING file for details.
