sam.cipher
Class Rijndael

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

public class Rijndael

extends Cipher

Implementation of the Rijndael cipher. Retrofitted for personal use by Guillaume Lacôte. Rijndael --pronounced Reindaal-- is a variable block-size (128-, 192- and 256-bit), variable key-size (128-, 192- and 256-bit) symmetric cipher.

Rijndael was written by Vincent Rijmen and Joan Daemen.

Portions of this code are Copyright © 1997, 1998 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: $

Nested Class Summary

static class

Rijndael.Key Key implementation that is adapted to the Rijndael 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

Rijndael(sam.cipher.Key key)

Method Summary

protected void	decrypt(byte[] data, int offset, sam.cipher.Key sessionKey) Convenience method to decrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
protected void	encrypt(byte[] data, int offset, sam.cipher.Key sessionKey) Convenience method to encrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
protected int	getPreferredSize(int size) Specifiy preferred buffer size.
static int	getRounds(int keySize, int blockSize) Return The number of rounds for a given Rijndael's key and block sizes.

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

Rijndael

public Rijndael(sam.cipher.Key key)

Method Detail

getPreferredSize

protected 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:

adjusted buffer size (in bytes)

encrypt

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

Convenience method to encrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).

Specified by:

encrypt in class Cipher

Parameters:

sessionKey - The session key to use for encryption.

decrypt

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

Convenience method to decrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).

Specified by:

decrypt in class Cipher

Parameters:

data - The ciphertext.

sessionKey - The session key to use for decryption.

getRounds

public static int getRounds(int keySize,
                            int blockSize)

Return The number of rounds for a given Rijndael's key and block sizes.

Parameters:

keySize - The size of the user key material in bytes.

blockSize - The desired block size in bytes.

Returns:

The number of rounds for a given Rijndael's key and block sizes.