NAME
    Crypt::TEA - Tiny Encryption Algorithm

SYNOPSIS
    use Crypt::TEA;

    $tea = Crypt::TEA->new($key);

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

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

DESCRIPTION
    This module implements TEA encryption, as described
    by David J. Wheeler and Roger M.  Needham in
    <http://www.ftp.cl.cam.ac.uk/ftp/papers/djw-rmn/djw-rmn-tea.html>.

    TEA is a 64-bit symmetric block cipher with a 128-bit key and
    a variable number of rounds (32 is recommended). It has a low
    setup time, and depends on a large number of rounds for security,
    rather than a complex algorithm.

    The module supports the Crypt::CBC interface, with the following
    functions.

  Functions

    blocksize
        Returns the size (in bytes) of the block (8, in this case).

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

    new($key, $rounds)
        This creates a new Crypt::TEA object with the specified key
        (assumed to be of keysize() bytes). The optional rounds
        parameter specifies the number of rounds of encryption to
        perform, and defaults to 32.

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

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

SEE ALSO
    <http://www.vader.brad.ac.uk/tea/tea.shtml>

    Crypt::CBC, Crypt::Blowfish, Crypt::DES

ACKNOWLEDGEMENTS
    Dave Paris, for taking the time to discuss and review the initial
    version of this module, making several useful suggestions, and
    contributing tests.

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

    Copyright 2001 Abhijit Menon-Sen. All rights reserved.

    This is free software; you may redistribute and/or modify it
    under the same terms as Perl itself.