net.vattp.data
Class Decrypt3DES

java.lang.Object
  |
  +--net.vattp.data.MsgTransformer
        |
        +--net.vattp.data.Decrypt3DES

class Decrypt3DES

extends MsgTransformer

Implementation of triple DES-EDE decryption in Cypher Block Chaining mode.

Author:

Bill Frantz

Field Summary

private byte[]	myCurrentBlock
private DES	myDes1
private DES	myDes2
private DES	myDes3
private byte[]	myDESKeys
private byte[]	myIV
private byte[]	myPad
private byte[]	myPreviousBlock

Constructor Summary

(package private)

Decrypt3DES(byte[] desKeys, byte[] iv)

Method Summary

private static String	eightToHex(byte[] b, int offset)
(package private) byte[]	getSuspendInfo() Get any information which will be required to resume a suspended connection.
private void	increment(byte[] value)
(package private) void	init() Initiate a transformation.
(package private) void	transform(byte[] buffer) Transform the data.
(package private) void	transform(byte[] buffer, int off, int len) Transform the data.
private void	xor8(byte[] inOut, int off, byte[] in)

Methods inherited from class java.lang.Object

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

Field Detail

myIV

private final byte[] myIV

myDESKeys

private final byte[] myDESKeys

myPreviousBlock

private final byte[] myPreviousBlock

myCurrentBlock

private byte[] myCurrentBlock

myDes1

private DES myDes1

myDes2

private DES myDes2

myDes3

private DES myDes3

myPad

private final byte[] myPad

Constructor Detail

Decrypt3DES

Decrypt3DES(byte[] desKeys,
            byte[] iv)

Method Detail

getSuspendInfo

byte[] getSuspendInfo()

Description copied from class: MsgTransformer

Get any information which will be required to resume a suspended connection.

Specified by:

getSuspendInfo in class MsgTransformer

init

void init()

Description copied from class: MsgTransformer

Initiate a transformation. This method must be called before the first transformation is called.

Specified by:

init in class MsgTransformer

transform

void transform(byte[] buffer,
               int off,
               int len)

Description copied from class: MsgTransformer

Transform the data.

Specified by:

transform in class MsgTransformer

Parameters:

buffer - is the data to be transformed.

off - is the offset in buffer to start the transformation

len - is the length to transform.

xor8

private void xor8(byte[] inOut,
                  int off,
                  byte[] in)

increment

private void increment(byte[] value)

eightToHex

private static String eightToHex(byte[] b,
                                 int offset)

transform

void transform(byte[] buffer)

Transform the data.

Parameters:

buffer - is the data to be transformed.