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MAN page from RedHat EL 3 perl-Crypt-Rijndael-1.09-1.el3.pp.i386.rpm

Rijndael

Section: User Contributed Perl Documentation (3)
Updated: 2010-01-17
Index 

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 selectedas the Advanced Encryption Standard.
keysize
Returns the keysize, which is 32 (bytes). The Rijndael cipheractually supports keylengths of 16, 24 or 32 bytes, but there is noway to communicate this to "Crypt::CBC".
blocksize
The blocksize for Rijndael is 16 bytes (128 bits), although thealgorithm actually supports any blocksize that is any multiple ofour 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 $modeargument is the encryption mode, either "MODE_ECB" (electroniccodebook mode, the default), "MODE_CBC" (cipher block chaining, thesame 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 dontknow why!), so you should probably use CBC mode.

$cipher->set_iv($iv)
This allows you to change the initial value vector used by thechaining 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, itcan 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, "<bdfoyAATTcpan.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 includedCOPYING file for details.


 

Index

NAME
SYNOPSIS
DESCRIPTION
Encryption modes
SEE ALSO
BUGS
AUTHOR
SOURCE
LICENSE

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