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.\" ========================================================================
.\"
.IX Title "Crypt::DES_PP 3"
.TH Crypt::DES_PP 3 "2000-10-27" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Crypt::DES_PP \- Perl extension for DES encryption
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
use Crypt::DES_PP;
.PP
.Vb 5
\&    $des = Crypt::DES_PP->new ($key);
\&    $cipher = $des->encrypt ($plain);
\&    $plain = $des->decrypt ($cipher);
\&    $blocksize = $des->blocksize;
\&    $keysize = $des->keysize;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The Data Encryption Standard (\s-1DES\s0), also known as Data Encryption 
Algorithm  (\s-1DEA\s0) is a semi-strong encryption and decryption algorithm.  
.PP
The module is 100 % compatible to Crypt::DES but is implemented 
entirely in Perl.  That means that you do not need a C compiler to 
build and install this extension.  
.PP
The module implements the Crypt::CBC interface.  You are encouraged
to read the documentation for Crypt::CBC if you intend to use this
module for Cipher Block Chaining.
.PP
The minimum (and maximum) key size is 8 bytes.  Shorter keys will
cause an exception, longer keys will get silently truncated.  Data
is encrypted and decrypted in blocks of 8 bytes.
.PP
The module implements the Ultra-Fast-Crypt (\s-1UFC\s0) algorithm as found
for example in the \s-1GNU\s0 libc.  On the Perl side a lot has been done
in order to make the module as fast as possible (function inlining,
use integer, ...).
.PP
Note: For performance issues the source code for the module is
first preprocessed by m4.  That means that you need an m4 macro
processor in order to hack on the sources.  This is of no concern
for you if you only want to use the module, the preprocessed output
is always included in the distribution.
.SH "BUGS"
.IX Header "BUGS"
Nothing known.  The module has not been tested on 64 bit architectures.
.SH "AUTHOR"
.IX Header "AUTHOR"
This implementation was written by Guido Flohr (guido@imperia.net).
It is available under the terms of the Lesser \s-1GNU\s0 General Public
License (\s-1LGPL\s0) version 2 or \- at your choice \- any later version,
see the file ``\s-1COPYING\s0.LIB''.
.PP
The original C implementation of the Ultra-Fast-Crypt algorithm
was written by Michael Glad (glad@daimi.aau.dk) and has been donated to 
the Free Software Foundation, Inc.  It is covered by the \s-1GNU\s0 library 
license version 2, see the file ``\s-1COPYING\s0.LIB''.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fICrypt::CBC\fR\|(3), \fICrypt::DES\fR\|(3), \fIperl\fR\|(1), \fIm4\fR\|(1).
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