NAME
Crypt::DES - Perl DES encryption module
SYNOPSIS
use
Crypt::DES;
DESCRIPTION
The module implements the Crypt::CBC interface, which has the following methods
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
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>.