Package com.trilead.ssh2.crypto.cipher

Class DES

java.lang.Object

com.trilead.ssh2.crypto.cipher.DES

All Implemented Interfaces:

BlockCipher

Direct Known Subclasses:

DESede

public class DES
extends Object
implements BlockCipher

DES.

Version:

$Id: DES.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $

Author:

See comments in the source file

Constructor Summary

Constructors

Constructor	Description
DES()	standard constructor.

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DES

public DES()

standard constructor.

Method Detail

init

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

initialise a DES cipher.

Specified by:

init in interface BlockCipher

Parameters:

encrypting - whether or not we are for encryption.

key - the parameters required to set up the cipher.

Throws:

IllegalArgumentException - if the params argument is inappropriate.

getAlgorithmName

public String getAlgorithmName()

getBlockSize

public int getBlockSize()

Specified by:

getBlockSize in interface BlockCipher

transformBlock

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

Specified by:

transformBlock in interface BlockCipher

reset

public void reset()

generateWorkingKey

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

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!).

Parameters:

encrypting - the encrypting

key - the key

off - the off

Returns:

the int [ ]

desFunc

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

the DES engine.

Parameters:

wKey - the w key

in - the in

inOff - the in off

out - the out

outOff - the out off