crypt::cast5(3pm) [debian 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)
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Crypt::Eksblowfish::Blowfish(3pm) User Contributed Perl Documentation Crypt::Eksblowfish::Blowfish(3pm) NAME
Crypt::Eksblowfish::Blowfish - Blowfish block cipher via Eksblowfish engine SYNOPSIS
use Crypt::Eksblowfish::Blowfish; $block_size = Crypt::Eksblowfish::Blowfish->blocksize; $key_size = Crypt::Eksblowfish::Blowfish->keysize; $cipher = Crypt::Eksblowfish::Blowfish->new($key); $block_size = $cipher->blocksize; $ciphertext = $cipher->encrypt($plaintext); $plaintext = $cipher->decrypt($ciphertext); $p_array = $cipher->p_array; $s_boxes = $cipher->s_boxes; if($cipher->is_weak) { ... DESCRIPTION
An object of this type encapsulates a keyed instance of the Blowfish block cipher, ready to encrypt and decrypt. Blowfish is a symmetric cipher algorithm designed by Bruce Schneier in 1993. It operates on 64-bit blocks, and takes a variable-length key from 32 bits (4 octets) to 448 bits (56 octets) in increments of 8 bits (1 octet). This implementation of Blowfish uses an encryption engine that was originally implemented in order to support Eksblowfish, which is a variant of Blowfish modified to make keying particularly expensive. See Crypt::Eksblowfish for that variant; this class implements the original Blowfish. CLASS METHODS
Crypt::Eksblowfish::Blowfish->blocksize Returns 8, indicating the Blowfish block size of 8 octets. This method may be called on either the class or an instance. Crypt::Eksblowfish::Blowfish->keysize Returns 0, indicating that the key size is variable. This situation is handled specially by "Crypt::CBC". CONSTRUCTOR
Crypt::Eksblowfish::Blowfish->new(KEY) Performs key setup on a new instance of the Blowfish algorithm, returning the keyed state. The KEY may be any length from 4 octets to 56 octets inclusive. You may occasionally come across an alleged Blowfish key that is outside this length range, and so is rejected by this constructor. Blowfish can internally process a key of any octet length up to 72 octets, and some implementations don't enforce the official length restrictions. If it is necessary for compatibility, a key of out-of-range length can be processed by Crypt::Eksblowfish::Uklblowfish. METHODS
$cipher->blocksize Returns 8, indicating the Blowfish block size of 8 octets. This method may be called on either the class or an instance. $cipher->encrypt(PLAINTEXT) PLAINTEXT must be exactly eight octets. The block is encrypted, and the ciphertext is returned. $cipher->decrypt(CIPHERTEXT) CIPHERTEXT must be exactly eight octets. The block is decrypted, and the plaintext is returned. $cipher->p_array $cipher->s_boxes These methods extract the subkeys from the keyed cipher. This is not required in ordinary operation. See the superclass Crypt::Eksblowfish::Subkeyed for details. $cipher->is_weak This method checks whether the cipher has been keyed with a weak key. It may be desired to avoid using weak keys. See the superclass Crypt::Eksblowfish::Subkeyed for details. SEE ALSO
Crypt::Eksblowfish, Crypt::Eksblowfish::Subkeyed, Crypt::Eksblowfish::Uklblowfish, <http://www.schneier.com/blowfish.html> AUTHOR
Eksblowfish guts originally by Solar Designer (solar at openwall.com). Modifications and Perl interface by Andrew Main (Zefram) <zefram@fysh.org>. COPYRIGHT
Copyright (C) 2006, 2007, 2008, 2009, 2010 Andrew Main (Zefram) <zefram@fysh.org> The original Eksblowfish code (in the form of crypt()) from which this module is derived is in the public domain. It may be found at <http://www.openwall.com/crypt/>. LICENSE
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2011-11-15 Crypt::Eksblowfish::Blowfish(3pm)