phpman > perldoc > Crypt::DES

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>.