DES
Section: User Contributed Perl Documentation (3)
Updated: 2021-02-22
Page Index
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@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>.