kz.gamma.hash
Class GOST28147Engine

java.lang.Object
  kz.gamma.hash.GOST28147Engine

public class GOST28147Engine
extends java.lang.Object

implementation of GOST 28147-89

Field Summary

protected static int	BLOCK_SIZE
private static byte[]	DSbox_A
private static byte[]	DSbox_Test
private static byte[]	ESbox_A
private static byte[]	ESbox_B
private static byte[]	ESbox_C
private static byte[]	ESbox_D
private static byte[]	ESbox_Test
private boolean	forEncryption
private static byte[]	S
private static java.util.Hashtable	sBoxes
private int[]	workingKey

Constructor Summary

GOST28147Engine()
standard constructor.

Method Summary

private int	bytesToint(byte[] in, int inOff)
private int[]	generateWorkingKey(boolean forEncryption, byte[] userKey)
java.lang.String	getAlgorithmName()
int	getBlockSize()
static byte[]	getSBox(java.lang.String sBoxName) Return the S-Box associated with SBoxName
private int	GOST28147_mainStep(int n1, int key)
private void	GOST28147Func(int[] workingKey, byte[] in, int inOff, byte[] out, int outOff)
void	init(boolean forEncryption, CipherParameters params) initialise an GOST28147 cipher.
private void	intTobytes(int num, byte[] out, int outOff)
int	processBlock(byte[] in, int inOff, byte[] out, int outOff)
void	reset()

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_SIZE

protected static final int BLOCK_SIZE

See Also:

Constant Field Values

workingKey

private int[] workingKey

forEncryption

private boolean forEncryption

S

private static byte[] S

ESbox_Test

private static byte[] ESbox_Test

ESbox_A

private static byte[] ESbox_A

ESbox_B

private static byte[] ESbox_B

ESbox_C

private static byte[] ESbox_C

ESbox_D

private static byte[] ESbox_D

DSbox_Test

private static byte[] DSbox_Test

DSbox_A

private static byte[] DSbox_A

sBoxes

private static java.util.Hashtable sBoxes

Constructor Detail

GOST28147Engine

public GOST28147Engine()

standard constructor.

Method Detail

init

public void init(boolean forEncryption,
                 CipherParameters params)

initialise an GOST28147 cipher.

Parameters:

forEncryption - whether or not we are for encryption.

params - the parameters required to set up the cipher.

Throws:

java.lang.IllegalArgumentException - if the params argument is inappropriate.

getAlgorithmName

public java.lang.String getAlgorithmName()

getBlockSize

public int getBlockSize()

processBlock

public int processBlock(byte[] in,
                        int inOff,
                        byte[] out,
                        int outOff)

reset

public void reset()

generateWorkingKey

private int[] generateWorkingKey(boolean forEncryption,
                                 byte[] userKey)

GOST28147_mainStep

private int GOST28147_mainStep(int n1,
                               int key)

GOST28147Func

private void GOST28147Func(int[] workingKey,
                           byte[] in,
                           int inOff,
                           byte[] out,
                           int outOff)

bytesToint

private int bytesToint(byte[] in,
                       int inOff)

intTobytes

private void intTobytes(int num,
                        byte[] out,
                        int outOff)

getSBox

public static byte[] getSBox(java.lang.String sBoxName)

Return the S-Box associated with SBoxName

Parameters:

sBoxName - name of the S-Box

Returns:

byte array representing the S-Box