NAME
Crypt::XTEA_PP - Pure Perl Implementation of the eXtended Tiny Encryption Algorithm
VERSION
version 0.0101
SYNOPSIS
use Crypt::XTEA_PP;
use Crypt::CBC;
my $xtea = Crypt::XTEA_PP->new( $key );
my $cbc = Crypt::CBC->new( -cipher => $xtea );
my $text = 'The quick brown fox jumps over the lazy dog.';
my $cipher_text = $cbc->encrypt( $text );
my $plain_text = $cbc->decrypt( $cipher_text );DESCRIPTION
In cryptography, XTEA (eXtended TEA) is a block cipher designed to correct weaknesses in TEA. The cipher's designers were David Wheeler and Roger Needham of the Cambridge Computer Laboratory, and the algorithm was presented in an unpublished technical report in 1997 (Needham and Wheeler, 1997). It is not subject to any patents.
Like TEA, XTEA is a 64-bit block Feistel cipher with a 128-bit key and a suggested 64 rounds. But in Crypt::XTEA_PP, the recommended value for $rounds is 32.
This module implements XTEA encryption. It supports the Crypt::CBC interface, with the following functions.
METHODS
keysize
Returns the maximum XTEA key size, 16 bytes.
blocksize
Returns the XTEA block size, which is 8 bytes. This function exists so that Crypt::XTEA_PP can work with Crypt::CBC.
new
my $xtea = Crypt::XTEA_PP->new( $key, $rounds );This creates a new Crypt::XTEA_PP object with the specified key. The optional rounds parameter specifies the number of rounds of encryption to perform, and defaults to 32.
encrypt
$cipher_text = $xtea->encrypt($plain_text);Encrypts blocksize() bytes of $plain_text and returns the corresponding ciphertext.
decrypt
$plain_text = $xtea->decrypt($cipher_text);Decrypts blocksize() bytes of $cipher_text and returns the corresponding plaintext.
SEE ALSO
AUTHOR
Kars Wang <jahiy@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2015 by Kars Wang.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.