crypt::des(3) [suse 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)
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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)