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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 = 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 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. 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 brian d foy, "<email@example.com>". 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/briandfoy/crypt-rijndael.git LICENSE This software is licensed under the Lesser GNU Public License. See the included COPYING file for details.