crypt::rijndael(3pm) [debian man page]

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

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, "<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

LICENSE

       This software is licensed under the Lesser GNU Public License. See the included COPYING file for details.

perl v5.14.2							    2009-12-10							     Rijndael(3pm)

Check Out this Related Man Page

DES(3)							User Contributed Perl Documentation						    DES(3)

NAME

       Crypt::DES - Perl DES encryption module

SYNOPSIS

	   use Crypt::DES;

DESCRIPTION

       The module implements the Crypt::CBC interface, which has the following methods

       blocksize =item keysize =item encrypt =item decrypt

FUNCTIONS

       blocksize
	   Returns the size (in bytes) of the block cipher.

       keysize
	   Returns the size (in bytes) of the key. Optimal size is 8 bytes.

       new
		   my $cipher = new Crypt::DES $key;

	   This creates a new Crypt::DES BlockCipher object, using $key, where $key is a key of "keysize()" bytes.

       encrypt
		   my $cipher = new Crypt::DES $key;
		   my $ciphertext = $cipher->encrypt($plaintext);

	   This function encrypts $plaintext and returns the $ciphertext where $plaintext and $ciphertext should be of "blocksize()" bytes.

       decrypt
		   my $cipher = new Crypt::DES $key;
		   my $plaintext = $cipher->decrypt($ciphertext);

	   This function decrypts $ciphertext and returns the $plaintext where $plaintext and $ciphertext should be of "blocksize()" bytes.

EXAMPLE

	       my $key = pack("H16", "0123456789ABCDEF");
	       my $cipher = new Crypt::DES $key;
	       my $ciphertext = $cipher->encrypt("plaintex");  # NB - 8 bytes
	       print unpack("H16", $ciphertext), "
";

NOTES

       Do note that DES only uses 8 byte keys and only works on 8 byte data blocks.  If you're intending to encrypt larger blocks or entire files,
       please use Crypt::CBC in conjunction with this module.  See the Crypt::CBC documentation for proper syntax and use.

       Also note that the DES algorithm is, by today's standard, weak encryption.  Crypt::Blowfish is highly recommended if you're interested in
       using strong encryption and a faster algorithm.

SEE ALSO

       Crypt::Blowfish Crypt::IDEA

       Bruce Schneier, Applied Cryptography, 1995, Second Edition, published by John Wiley & Sons, Inc.

COPYRIGHT

       The implementation of the DES algorithm was developed by, and is copyright of, Eric Young (eay@mincom.oz.au).  Other parts of the perl
       extension and module are copyright of Systemics Ltd ( http://www.systemics.com/ ).  Cross-platform work and packaging for single algorithm
       distribution is copyright of W3Works, LLC.

MAINTAINER

       This single-algorithm package and cross-platform code is maintained by Dave Paris <amused@pobox.com>.

perl v5.12.1							    2005-12-08								    DES(3)

Linux and UNIX Man Pages

crypt::rijndael(3pm) [debian man page]

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