javax.crypto.spec
Class DESedeKeySpec

java.lang.Object
  javax.crypto.spec.DESedeKeySpec

All Implemented Interfaces:

KeySpec

public class DESedeKeySpec
extends Object
implements KeySpec

This class specifies a DES-EDE ("triple-DES") key.

Version:

$Id: DESedeKeySpec.java 1913 2007-08-08 02:41:53Z jpeters $

Author:

Patric Kabus, Jan Peters

Field Summary

static int	DES_EDE_KEY_LEN The constant which defines the length of a DESede key in bytes.
private byte[]	key_ The DES-EDE key material.

Constructor Summary

DESedeKeySpec(byte[] key)
Uses the first 24 bytes in key as the DES-EDE key.

DESedeKeySpec(byte[] key, int offset)
Uses the first 24 bytes in key, beginning at offset inclusive, as the DES-EDE key.

Method Summary

byte[]	getKey() Returns the DES-EDE key.
static boolean	isParityAdjusted(byte[] key, int offset) Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.

Methods inherited from class java.lang.Object

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

Field Detail

DES_EDE_KEY_LEN

public static final int DES_EDE_KEY_LEN

The constant which defines the length of a DESede key in bytes.

See Also:

Constant Field Values

key_

private byte[] key_

The DES-EDE key material.

Constructor Detail

DESedeKeySpec

public DESedeKeySpec(byte[] key)
              throws InvalidKeyException

Uses the first 24 bytes in key as the DES-EDE key.

The bytes that constitute the DES-EDE key are those between key[0] and key[23] inclusive.

Parameters:

key - the buffer with the DES-EDE key material.

Throws:

InvalidKeyException - if the given key material is shorter than 24 bytes.

NullPointerException - if key is null.

DESedeKeySpec

public DESedeKeySpec(byte[] key,
                     int offset)
              throws InvalidKeyException

Uses the first 24 bytes in key, beginning at offset inclusive, as the DES-EDE key.

The bytes that constitute the DES-EDE key are those between key[offset] and key[offset+23] inclusive.

Parameters:

key - the buffer with the DES-EDE key material.

offset - the offset in key, where the DES-EDE key material starts.

Throws:

InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 24 bytes.

NullPointerException - if key is null.

Method Detail

getKey

public byte[] getKey()

Returns the DES-EDE key.

Returns:

the DES-EDE key.

isParityAdjusted

public static boolean isParityAdjusted(byte[] key,
                                       int offset)
                                throws InvalidKeyException

Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.

Parameters:

key - a byte array which holds the key value.

offset - the offset into the byte array.

Returns:

true if the given DES-EDE key is parity-adjusted, false otherwise.

Throws:

InvalidKeyException - the given key material, starting at offset inclusive, is shorter than 24 bytes.

NullPointerException - if key is null.