phpman > perldoc > Crypt::Rijndael(3pm)

NAME
    Crypt::Rijndael - Crypt::CBC compliant Rijndael encryption module

VERSION
    Version 1.16

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
    Crypt::CBC, http://www.csrc.nist.gov/encryption/aes/

BUGS
    Should EXPORT or EXPORT_OK the MODE constants.

AUTHOR
    Currently maintained by Leon Timmermans "leont AT cpan.org".

    Previously maintained by brian d foy, "<bdfoy AT 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/leont/crypt-rijndael.git

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