de.flexiprovider.core.desede
Class DESKeySpec

java.lang.Object
  |
  +--javax.crypto.spec.DESKeySpec
        |
        +--de.flexiprovider.core.desede.DESKeySpec

All Implemented Interfaces:

KeySpec, java.security.spec.KeySpec

public class DESKeySpec

extends javax.crypto.spec.DESKeySpec

implements KeySpec

This class specifies a DES key.

Fields inherited from class javax.crypto.spec.DESKeySpec

DES_KEY_LEN

Constructor Summary

DESKeySpec(byte[] key)
Uses the first 8 bytes in key as the key material for the DES key.

DESKeySpec(byte[] key, int offset)
Uses the first 8 bytes in key, beginning at offset inclusive, as the key material for the DES key.

Method Summary

byte[]	getDESKey()
static boolean	isParityAdjusted(byte[] key, int offset) Checks if the given DES key material, starting at offset inclusive, is parity-adjusted.
static boolean	isWeak(byte[] key, int offset) Checks if the given DES key material is weak or semi-weak.

Methods inherited from class javax.crypto.spec.DESKeySpec

, getKey

Methods inherited from class java.lang.Object

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

Constructor Detail

DESKeySpec

public DESKeySpec(byte[] key)
           throws java.security.InvalidKeyException

Uses the first 8 bytes in key as the key material for the DES key. The bytes that constitute the DES key are those between key[0] and key[7] inclusive.

Parameters:

key - the buffer with the DES key material.

Throws:

java.security.InvalidKeyException - if the given key material is shorter than 8 bytes.

DESKeySpec

public DESKeySpec(byte[] key,
                  int offset)
           throws java.security.InvalidKeyException

Uses the first 8 bytes in key, beginning at offset inclusive, as the key material for the DES key. The bytes that constitute the DES key are those between key[offset] and key[offset+7] inclusive.

Parameters:

key - the buffer with the DES key material.

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

Throws:

java.security.InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 8 bytes.

Method Detail

getDESKey

public byte[] getDESKey()

Returns:

the DES key material.

isParityAdjusted

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

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

Parameters:

key - the buffer with the DES key material.

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

Returns:

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

Throws:

java.security.InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 8 bytes.

isWeak

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

Checks if the given DES key material is weak or semi-weak.

Parameters:

key - the buffer with the DES key material.

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

Returns:

true if the given DES key material is weak or semi-weak, false otherwise.

Throws:

InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 8 bytes.