1DES(3)                User Contributed Perl Documentation               DES(3)
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NAME

6       Crypt::DES - Perl DES encryption module
7

SYNOPSIS

9           use Crypt::DES;
10

DESCRIPTION

12       The module implements the Crypt::CBC interface, which has the following
13       methods
14
15       blocksize =item keysize =item encrypt =item decrypt
16

FUNCTIONS

18       blocksize
19           Returns the size (in bytes) of the block cipher.
20
21       keysize
22           Returns the size (in bytes) of the key. Optimal size is 8 bytes.
23
24       new
25                   my $cipher = new Crypt::DES $key;
26
27           This creates a new Crypt::DES BlockCipher object, using $key, where
28           $key is a key of "keysize()" bytes.
29
30       encrypt
31                   my $cipher = new Crypt::DES $key;
32                   my $ciphertext = $cipher->encrypt($plaintext);
33
34           This function encrypts $plaintext and returns the $ciphertext where
35           $plaintext and $ciphertext should be of "blocksize()" bytes.
36
37       decrypt
38                   my $cipher = new Crypt::DES $key;
39                   my $plaintext = $cipher->decrypt($ciphertext);
40
41           This function decrypts $ciphertext and returns the $plaintext where
42           $plaintext and $ciphertext should be of "blocksize()" bytes.
43

EXAMPLE

45               my $key = pack("H16", "0123456789ABCDEF");
46               my $cipher = new Crypt::DES $key;
47               my $ciphertext = $cipher->encrypt("plaintex");  # NB - 8 bytes
48               print unpack("H16", $ciphertext), "\n";
49

NOTES

51       Do note that DES only uses 8 byte keys and only works on 8 byte data
52       blocks.  If you're intending to encrypt larger blocks or entire files,
53       please use Crypt::CBC in conjunction with this module.  See the
54       Crypt::CBC documentation for proper syntax and use.
55
56       Also note that the DES algorithm is, by today's standard, weak encryp‐
57       tion.  Crypt::Blowfish is highly recommended if you're interested in
58       using strong encryption and a faster algorithm.
59

SEE ALSO

61       Crypt::Blowfish Crypt::IDEA
62
63       Bruce Schneier, Applied Cryptography, 1995, Second Edition, published
64       by John Wiley & Sons, Inc.
65

67       The implementation of the DES algorithm was developed by, and is copy‐
68       right of, Eric Young (eay@mincom.oz.au).  Other parts of the perl
69       extension and module are copyright of Systemics Ltd ( http://www.sys‐
70       temics.com/ ).  Cross-platform work and packaging for single algorithm
71       distribution is copyright of W3Works, LLC.
72

MAINTAINER

74       This single-algorithm package and cross-platform code is maintained by
75       Dave Paris <amused@pobox.com>.
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79perl v5.8.8                       2005-12-08                            DES(3)
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