Class Rijndael_Algorithm

java.lang.Object
  |
  +--Rijndael_Algorithm

public final class Rijndael_Algorithm

extends java.lang.Object

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: $

Constructor Summary

Rijndael_Algorithm()

Method Summary

static byte[]	blockDecrypt(byte[] in, int inOffset, java.lang.Object sessionKey) Convenience method to decrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
static byte[]	blockDecrypt(byte[] in, int inOffset, java.lang.Object sessionKey, int blockSize) Decrypt exactly one block of ciphertext.
static byte[]	blockEncrypt(byte[] in, int inOffset, java.lang.Object sessionKey) Convenience method to encrypt exactly one block of plaintext, assuming Rijndael's default block size (128-bit).
static byte[]	blockEncrypt(byte[] in, int inOffset, java.lang.Object sessionKey, int blockSize) Encrypt exactly one block of plaintext.
static int	blockSize()
static int	getRounds(int keySize, int blockSize) Return The number of rounds for a given Rijndael's key and block sizes.
static void	main(java.lang.String[] args)
static java.lang.Object	makeKey(byte[] k) Convenience method to expand a user-supplied key material into a session key, assuming Rijndael's default block size (128-bit).
static java.lang.Object	makeKey(byte[] k, int blockSize) Expand a user-supplied key material into a session key.
static boolean	self_test() A basic symmetric encryption/decryption test.

Methods inherited from class java.lang.Object

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

Constructor Detail

Rijndael_Algorithm

public Rijndael_Algorithm()

Method Detail

makeKey

public static java.lang.Object makeKey(byte[] k)
                                throws java.security.InvalidKeyException

Convenience method to expand a user-supplied key material into a session key, assuming Rijndael's default block size (128-bit).

Parameters:

key - The 128/192/256-bit user-key to use.

Throws:

java.security.InvalidKeyException - If the key is invalid.

blockEncrypt

public static byte[] blockEncrypt(byte[] in,
                                  int inOffset,
                                  java.lang.Object sessionKey)

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

Parameters:

in - The plaintext.

inOffset - Index of in from which to start considering data.

sessionKey - The session key to use for encryption.

Returns:

The ciphertext generated from a plaintext using the session key.

blockDecrypt

public static byte[] blockDecrypt(byte[] in,
                                  int inOffset,
                                  java.lang.Object sessionKey)

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

Parameters:

in - The ciphertext.

inOffset - Index of in from which to start considering data.

sessionKey - The session key to use for decryption.

Returns:

The plaintext generated from a ciphertext using the session key.

self_test

public static boolean self_test()

A basic symmetric encryption/decryption test.

blockSize

public static int blockSize()

Returns:

The default length in bytes of the Algorithm input block.

makeKey

public static java.lang.Object makeKey(byte[] k,
                                       int blockSize)
                                throws java.security.InvalidKeyException

Expand a user-supplied key material into a session key.

Parameters:

key - The 128/192/256-bit user-key to use.

blockSize - The block size in bytes of this Rijndael.

Throws:

java.security.InvalidKeyException - If the key is invalid.

blockEncrypt

public static byte[] blockEncrypt(byte[] in,
                                  int inOffset,
                                  java.lang.Object sessionKey,
                                  int blockSize)

Encrypt exactly one block of plaintext.

Parameters:

in - The plaintext.

inOffset - Index of in from which to start considering data.

sessionKey - The session key to use for encryption.

blockSize - The block size in bytes of this Rijndael.

Returns:

The ciphertext generated from a plaintext using the session key.

blockDecrypt

public static byte[] blockDecrypt(byte[] in,
                                  int inOffset,
                                  java.lang.Object sessionKey,
                                  int blockSize)

Decrypt exactly one block of ciphertext.

Parameters:

in - The ciphertext.

inOffset - Index of in from which to start considering data.

sessionKey - The session key to use for decryption.

blockSize - The block size in bytes of this Rijndael.

Returns:

The plaintext generated from a ciphertext using the session key.

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.

main

public static void main(java.lang.String[] args)