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 don't 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
    the Crypt::CBC manpage, http://www.csrc.nist.gov/encryption/aes/

BUGS
    Should EXPORT or EXPORT_OK the MODE constants.

AUTHOR
    Currently maintained by brian d foy, `< <bdfoy@cpan.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
            
    =head1 LICENSE

    This software is licensed under the Lesser GNU Public License v3
    (29 June 2007). See the included COPYING file for details.