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)

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

NAME

       Crypt::Blowfish - Perl Blowfish encryption module

SYNOPSIS

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

	 You probably want to use this in conjunction with
	 a block chaining module like Crypt::CBC.

DESCRIPTION

       Blowfish is capable of strong encryption and can use key sizes up to 56 bytes (a 448 bit key).  You're encouraged to take advantage of the
       full key size to ensure the strongest encryption possible from this module.

       Crypt::Blowfish has the following methods:

	blocksize()
	keysize()
	encrypt()
	decrypt()

FUNCTIONS

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

	   Crypt::Blowfish doesn't return a key size due to its ability to use variable-length keys.  More accurately, it shouldn't, but it does
	   anyway to play nicely with others.

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

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

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

	   This function encrypts $plaintext and returns the $ciphertext where $plaintext and $ciphertext must be of "blocksize()" bytes.  (hint:
	   Blowfish is an 8 byte block cipher)

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

	   This function decrypts $ciphertext and returns the $plaintext where $plaintext and $ciphertext must be of "blocksize()" bytes.  (hint:
	   see previous hint)

EXAMPLE

	       my $key = pack("H16", "0123456789ABCDEF");  # min. 8 bytes
	       my $cipher = new Crypt::Blowfish $key;
	       my $ciphertext = $cipher->encrypt("plaintex");  # SEE NOTES
	       print unpack("H16", $ciphertext), "
";

PLATFORMS

	       Please see the README document for platforms and performance
	       tests.

NOTES

       The module is capable of being used with Crypt::CBC.  You're encouraged to read the perldoc for Crypt::CBC if you intend to use this module
       for Cipher Block Chaining modes.  In fact, if you have any intentions of encrypting more than eight bytes of data with this, or any other
       block cipher, you're going to need some type of block chaining help.  Crypt::CBC tends to be very good at this.	If you're not going to
       encrypt more than eight bytes, your data must be exactly eight bytes long.  If need be, do your own padding. "" as a null byte is
       perfectly valid to use for this.

SEE ALSO

       Crypt::CBC, Crypt::DES, Crypt::IDEA

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

COPYRIGHT

       The implementation of the Blowfish algorithm was developed by, and is copyright of, A.M. Kuchling.

       Other parts of the perl extension and module are copyright of Systemics Ltd ( http://www.systemics.com/ ).

       Code revisions, updates, and standalone release are copyright 1999-2010 W3Works, LLC.

AUTHOR

       Original algorithm, Bruce Shneier.  Original implementation, A.M.  Kuchling.  Original Perl implementation, Systemics Ltd.  Current
       maintenance by W3Works, LLC.

       Current revision and maintainer:  Dave Paris <amused@pobox.com>

perl v5.14.2							    2010-03-04							     Blowfish(3pm)