README
1NAME
2 Crypt::DES_PP - Perl extension for DES encryption
3
4SYNOPSIS
5 use Crypt::DES_PP;
6
7 $des = Crypt::DES_PP->new ($key);
8 $cipher = $des->encrypt ($plain);
9 $plain = $des->decrypt ($cipher);
10 $blocksize = $des->blocksize;
11 $keysize = $des->keysize;
12
13DESCRIPTION
14 The Data Encryption Standard (DES), also known as Data
15 Encryption Algorithm (DEA) is a semi-strong encryption and
16 decryption algorithm.
17
18 The module is 100 % compatible to Crypt::DES but is implemented
19 entirely in Perl. That means that you do not need a C compiler
20 to build and install this extension.
21
22 The module implements the Crypt::CBC interface. You are
23 encouraged to read the documentation for Crypt::CBC if you
24 intend to use this module for Cipher Block Chaining.
25
26 The minimum (and maximum) key size is 8 bytes. Shorter keys will
27 cause an exception, longer keys will get silently truncated.
28 Data is encrypted and decrypted in blocks of 8 bytes.
29
30 The module implements the Ultra-Fast-Crypt (UFC) algorithm as
31 found for example in the GNU libc. On the Perl side a lot has
32 been done in order to make the module as fast as possible
33 (function inlining, use integer, ...).
34
35 Note: For performance issues the source code for the module is
36 first preprocessed by m4. That means that you need an m4 macro
37 processor in order to hack on the sources. This is of no concern
38 for you if you only want to use the module, the preprocessed
39 output is always included in the distribution.
40
41BUGS
42 Nothing known. The module has not been tested on 64 bit
43 architectures.
44
45AUTHOR
46 This implementation was written by Guido Flohr
47 (guido@imperia.net). It is available under the terms of the
48 Lesser GNU General Public License (LGPL) version 2 or - at your
49 choice - any later version, see the file ``COPYING.LIB''.
50
51 The original C implementation of the Ultra-Fast-Crypt algorithm
52 was written by Michael Glad (glad@daimi.aau.dk) and has been
53 donated to the Free Software Foundation, Inc. It is covered by
54 the GNU library license version 2, see the file ``COPYING.LIB''.
55
56SEE ALSO
57 Crypt::CBC(3), Crypt::DES(3), perl(1), m4(1).
58
59