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Rijndael(3)           User Contributed Perl Documentation          Rijndael(3)



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, "<bdfoyATcpan.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.

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.



perl v5.10.1                      2010-01-17                       Rijndael(3)