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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 = new Crypt::Rijndael "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 = 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.
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.
LICENSE
This code is licensed under the GNU Public License. See COPYING for
details.
Changes:
0.06 - Sun Nov 12 10:38:56 2006
* Adjust version number to match distro number (RT #4227)
* Use <sys/types.h> instead of hard-coding (RT #22755, 9514, 18812,
1444, 503).
* This module is now maintained by brian d foy (bdfoy@cpan.org)
