NAME
    Crypt::NULL - NULL Encryption Algorithm

SYNOPSIS
    use Crypt::NULL;

    $null = Crypt::NULL->new($key);

    $ciphertext = $null->encrypt($plaintext);

    $plaintext = $null->decrypt($ciphertext);

DESCRIPTION
    The NULL Encryption Algorithm is a symmetric block cipher described
    in RFC 2410 by Rob Glenn and Stephen Kent.

    This module implements NULL encryption. It supports the Crypt::CBC
    interface, with the following functions.

  Functions

    blocksize
        Returns the size (in bytes) of the block (16, in this case).

    keysize
        Returns the size (in bytes) of the key (16, in this case).

    new($key)
        This creates a new Crypt::NULL object with the specified key.

    encrypt($data)
        Encrypts blocksize() bytes of $data and returns the
        corresponding ciphertext.

    decrypt($data)
        Decrypts blocksize() bytes of $data and returns the
        corresponding plaintext.

SEE ALSO
    Crypt::CBC, Crypt::TEA, Crypt::Blowfish

AUTHOR
    Abhijit Menon-Sen <ams@wiw.org>

    Copyright 2001 Abhijit Menon-Sen. All rights reserved.

    This software is distributed under the terms of the Artistic License
    <URL:http://ams.wiw.org/code/artistic.txt>.