Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption module
# keysize() is 32, but 24 and 16 are also possible
$cipher = new Crypt::Rijndael "a" x 32, Crypt::Rijndael::MODE_CBC;
$crypted = $cipher->encrypt($plaintext);
$plaintext = $cipher->decrypt($crypted);
This module implements the Rijndael cipher, which has just been selected
as the Advanced Encryption Standard.
bootstrap Crypt
::Rijndael
$VERSION;
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 C<Crypt::CBC>.
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.
=item $cipher = new $key [, $mode]
Create a new C<Crypt::Rijndael> cipher object with the given key
(which must be 128, 192 or 256 bits long). The additional C<$mode>
argument is the encryption mode, either C<MODE_ECB> (electronic
codebook mode, the default), C<MODE_CBC> (cipher block chaining, the
same that C<Crypt::CBC> does), C<MODE_CFB> (128-bit cipher feedback),
C<MODE_OFB> (128-bit output feedback), or C<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.
=item $cipher->set_iv($iv)
This allows you to change the initial value vector used by the
chaining modes. It is not relevant for ECB mode.
=item $cipher->encrypt($data)
Encrypt data. The size of C<$data> must be a multiple of C<blocksize>
(16 bytes), otherwise this function will croak. Apart from that, it
can be of (almost) any length.
=item $cipher->decrypt($data)
L<Crypt::CBC>, http://www.csrc.nist.gov/encryption/aes/
Should EXPORT or EXPORT_OK the MODE constants.
Rafael R. Sevilla <sevillar@team.ph.inter.net>
The Rijndael Algorithm was developed by Vincent Rijmen and Joan Daemen,
and has been selected as the US Government's Advanced Encryption Standard.