Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption module
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);
This module implements the Rijndael cipher, which has just been selected as the Advanced Encryption Standard.
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
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::Rijndaelcipher object with the given key (which must be 128, 192 or 256 bits long). The additional
$modeargument is the encryption mode, either
MODE_ECB(electronic codebook mode, the default),
MODE_CBC(cipher block chaining, the same that
MODE_CFB(128-bit cipher feedback),
MODE_OFB(128-bit output feedback), or
ECB mode is very insecure (read a book on cryptography if you dont know why!), so you should probably use CBC mode.
This allows you to change the initial value vector used by the chaining modes. It is not relevant for ECB mode.
Encrypt data. The size of
$datamust be a multiple of
blocksize(16 bytes), otherwise this function will croak. Apart from that, it can be of (almost) any length.
Should EXPORT or EXPORT_OK the MODE constants.
Rafael R. Sevilla <firstname.lastname@example.org> The Rijndael Algorithm was developed by Vincent Rijmen and Joan Daemen, and has been selected as the US Government's Advanced Encryption Standard.