man Crypt::Rijndael () - Crypt::CBC compliant Rijndael encryption module

NAME

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.

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 CWCrypt::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. Create a new CWCrypt::Rijndael cipher object with the given key (which must be 128, 192 or 256 bits long). The additional CW$mode argument is the encryption mode, either CWMODE_ECB (electronic codebook mode, the default), CWMODE_CBC (cipher block chaining, the same that CWCrypt::CBC does), CWMODE_CFB (128-bit cipher feedback), CWMODE_OFB (128-bit output feedback), or CWMODE_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 CW$data must be a multiple of CWblocksize (16 bytes), otherwise this function will croak. Apart from that, it can be of (almost) any length.
$cipher->decrypt($data): Decrypts CW$data.

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.