Crypt::DES(3pm) - phpMan

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

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), "\n";

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 AT mincom.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 AT pobox.com>.

perl v5.34.0                                2022-02-06                                   DES(3pm)

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2025-11-21 17:46 @216.73.216.164 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)