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

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)

Check Out this Related Man Page

CAST5(3pm)						User Contributed Perl Documentation						CAST5(3pm)

NAME

       Crypt::CAST5 - CAST5 block cipher

SYNOPSIS

	   use Crypt::CBC;

	   my $crypt = Crypt::CBC->new({
	       key    => "secret key",
	       cipher => "CAST5",
	   });

	   my $message = "All mimsy were the borogoves";
	   my $ciphertext = $crypt->encrypt($message);
	   print unpack("H*", $ciphertext), "
";

	   my $plaintext = $crypt->decrypt($ciphertext);
	   print $plaintext, "
";

DESCRIPTION

       This module provides an implementation of the CAST5 block cipher using compiled C code for increased speed. CAST5 is also known as
       CAST-128. It is a product of the CAST design procedure developed by C. Adams and S. Tavares.

       The CAST5 cipher is available royalty-free.

FUNCTIONS

   blocksize
       Returns the CAST5 block size, which is 8 bytes. This function exists so that Crypt::CAST5 can work with Crypt::CBC.

   keysize
       Returns the maximum CAST5 key size, 16 bytes.

   new
	   $cast5 = Crypt::CAST5->new($key);

       Create a new encryption object. If the optional key parameter is given, it will be passed to the init() function.

   init
	   $cast5->init($key);

       Set or change the encryption key to be used. The key must be from 40 bits (5 bytes) to 128 bits (16 bytes) in length. Note that if the key
       used is 80 bits or less, encryption and decryption will be somewhat faster.

       It is best for the key to be random binary data, not something printable like a password. A message digest function may be useful for
       converting a password to an encryption key; see Digest::SHA1 or Digest::MD5.  Note that Crypt::CBC runs the given "key" through MD5 to get
       the actual encryption key.

   encrypt
	   $ciphertext = $cast5->encrypt($plaintext);

       Encrypt a block of plaintext using the current encryption key, and return the corresponding ciphertext. The input must be 8 bytes long, and
       the output has the same length. Note that the encryption is in ECB mode, which means that it encrypts each block independently. That can
       leave you vulnerable to dictionary attacks, so it is generally best to use some form of chaining between blocks; see Crypt::CBC.

   decrypt
	   $plaintext = $cast5->decrypt($ciphertext);

       Decrypt the ciphertext and return the corresponding plaintext.

SEE ALSO

       RFC 2144, "The CAST-128 Encryption Algorithm", C. Adams, May 1997

       Crypt::CBC

AUTHOR

       Bob Mathews, <bobmathews@alumni.calpoly.edu>

COPYRIGHT AND LICENSE

       Copyright (C) 2002-2006 Bob Mathews

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2006-07-01								CAST5(3pm)

Linux and UNIX Man Pages

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

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