sam.cipher
Class Twofish

java.lang.Object
  |
  +--sam.cipher.Cipher
        |
        +--sam.cipher.Twofish

public class Twofish

extends Cipher

Implementation of the Twofish cipher. Retrofitted for personal use by Guillaume Lacôte.

Copyright (c) 1997, 1998 Systemics Ltd on behalf of the Cryptix Development Team. All rights reserved. Copyright © 1998 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: $

Nested Class Summary

static class

Twofish.Key Key implementation that is adapted to the Twofish cipher.

Nested classes inherited from class sam.cipher.Cipher

Cipher.ByteArrayFilter, Cipher.Error

Field Summary

Fields inherited from class sam.cipher.Cipher

DECRYPT, EMPTY, ENCRYPT, INVERSE, key, REGISTRY

Constructor Summary

Twofish(sam.cipher.Key key)

Method Summary

protected void	decrypt(byte[] data, int offset, sam.cipher.Key aKey) Decrypt exactly one block of ciphertext.
protected void	encrypt(byte[] data, int offset, sam.cipher.Key aKey) Encrypt exactly one block of plaintext.
int	getPreferredSize(int size) Specifiy preferred buffer size.

Methods inherited from class sam.cipher.Cipher

cipher, cipher, fill, main, store, store, storeReversed, streamTest, test, unstoreInt, unstoreLong, unstoreReversedLong

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Twofish

public Twofish(sam.cipher.Key key)

Method Detail

getPreferredSize

public int getPreferredSize(int size)

Description copied from class: Cipher

Specifiy preferred buffer size.

May return a fixed value, ignoring suggested size (e.g. return 16;).

By default, this implementation simply returns its argument unchanged.

Overrides:

getPreferredSize in class Cipher

Parameters:

size - proposed buffer size (in bytes)

Returns:

The length in bytes of the Algorithm input block.

encrypt

protected void encrypt(byte[] data,
                       int offset,
                       sam.cipher.Key aKey)

Encrypt exactly one block of plaintext.

Specified by:

encrypt in class Cipher

Parameters:

data - The plaintext.

aKey - The session key to use for encryption.

decrypt

protected void decrypt(byte[] data,
                       int offset,
                       sam.cipher.Key aKey)

Decrypt exactly one block of ciphertext.

Specified by:

decrypt in class Cipher

Parameters:

data - The ciphertext.

aKey - The session key to use for decryption.

Returns:

The plaintext generated from a ciphertext using the session key.