cryptix.provider.key

Class DES_EDE3KeyGenerator

java.lang.Object

xjava.security.KeyGenerator

cryptix.provider.key.RawKeyGenerator

cryptix.provider.key.DESKeyGenerator

cryptix.provider.key.DES_EDE3KeyGenerator

All Implemented Interfaces:

java.lang.Cloneable, ExtendedKeyGenerator, Parameterized

public class DES_EDE3KeyGenerator
extends DESKeyGenerator

A key generator for Triple DES with 3 independent DES keys.

A total of 24 bytes are generated, with a parity bit as the LSB of each byte (i.e. there are 2^168 possible keys). The keys are encoded in the order in which they are used for encryption. A Triple DES key is considered weak if any of its constituent keys are weak, or if two or more of those keys are equal, ignoring parity.

Copyright © 1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.2 $

Since:

Cryptix 2.2.0a, 2.2.2

Author:

David Hopwood, Raif Naffah

Constructor Summary

Constructors

Constructor and Description
DES_EDE3KeyGenerator()

Method Summary

Modifier and Type	Method and Description
protected boolean	isWeak(byte[] key) Returns true iff the first 24 bytes of key represent a weak or semi-weak Triple DES key.

Methods inherited from class cryptix.provider.key.DESKeyGenerator

engineGenerateKey, isWeak, setParity

Methods inherited from class cryptix.provider.key.RawKeyGenerator

generateKey, generateKey, getDefaultKeyLength, getMaximumKeyLength, getMinimumKeyLength, initialize, initialize, isValidKeyLength, isWeakAllowed, setWeakAllowed

Methods inherited from class xjava.security.KeyGenerator

clone, engineGetParameter, engineSetParameter, getAlgorithm, getAlgorithms, getAlgorithms, getInstance, getInstance, getParameter, setParameter, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

DES_EDE3KeyGenerator

public DES_EDE3KeyGenerator()

Method Detail

isWeak

protected boolean isWeak(byte[] key)

Returns true iff the first 24 bytes of key represent a weak or semi-weak Triple DES key.

Overrides:

isWeak in class DESKeyGenerator