net.sourceforge.jtds.util
Class DESEngine

java.lang.Object
  net.sourceforge.jtds.util.DESEngine

public class DESEngine

extends java.lang.Object

a class that provides a basic DES engine. Modified by Matt Brinkley (mdb) ... mainly just removed depends on external classes.

Version:

$Id: DESEngine.java,v 1.3.6.1 2009/08/04 10:33:54 ickzon Exp $

Author:

Matt Brinkley

Field Summary

(package private) static int[]	bigbyte
protected static int	BLOCK_SIZE
(package private) static short[]	bytebit
(package private) static short[]	Df_Key what follows is mainly taken from "Applied Cryptography", by Bruce Schneier, however it also bears great resemblance to Richard Outerbridge's D3DES...
(package private) static byte[]	pc1
(package private) static byte[]	pc2
(package private) static int[]	SP1
(package private) static int[]	SP2
(package private) static int[]	SP3
(package private) static int[]	SP4
(package private) static int[]	SP5
(package private) static int[]	SP6
(package private) static int[]	SP7
(package private) static int[]	SP8
(package private) static byte[]	totrot
private int[]	workingKey

Constructor Summary

DESEngine()
standard constructor.

DESEngine(boolean encrypting, byte[] key)
mdb: convenient constructor

Method Summary

protected void	desFunc(int[] wKey, byte[] in, int inOff, byte[] out, int outOff) the DES engine.
protected int[]	generateWorkingKey(boolean encrypting, byte[] key) generate an integer based working key based on our secret key and what we processing we are planning to do.
java.lang.String	getAlgorithmName()
int	getBlockSize()
void	init(boolean encrypting, byte[] key) initialise a DES cipher.
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

Df_Key

static short[] Df_Key

what follows is mainly taken from "Applied Cryptography", by Bruce Schneier, however it also bears great resemblance to Richard Outerbridge's D3DES...

bytebit

static short[] bytebit

bigbyte

static int[] bigbyte

pc1

static byte[] pc1

totrot

static byte[] totrot

pc2

static byte[] pc2

SP1

static int[] SP1

SP2

static int[] SP2

SP3

static int[] SP3

SP4

static int[] SP4

SP5

static int[] SP5

SP6

static int[] SP6

SP7

static int[] SP7

SP8

static int[] SP8

Constructor Detail

DESEngine

public DESEngine()

standard constructor.

DESEngine

public DESEngine(boolean encrypting,
                 byte[] key)

mdb: convenient constructor

Method Detail

init

public void init(boolean encrypting,
                 byte[] key)

initialise a DES cipher.

Parameters:

encrypting - whether or not we are for encryption.

key - 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

protected int[] generateWorkingKey(boolean encrypting,
                                   byte[] key)

generate an integer based working key based on our secret key and what we processing we are planning to do. Acknowledgements for this routine go to James Gillogly & Phil Karn. (whoever, and wherever they are!).

desFunc

protected void desFunc(int[] wKey,
                       byte[] in,
                       int inOff,
                       byte[] out,
                       int outOff)

the DES engine.