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Class javax.crypto.spec.DESKeySpec

java.lang.Object
  |
  +--javax.crypto.spec.DESKeySpec

public class DESKeySpec
extends java.lang.Object
implements java.security.spec.KeySpec
This class specifies a DES key.


Field Summary
static int 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, as the key material for the DES key.
 
Method Summary
byte[] getKey()
          Returns the DES key material.
static boolean isParityAdjusted(byte[] key, int offset)
          Checks if the given DES key material, starting at offset, 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 java.lang.Object
clone, equals, finalize, getClass, hashCode, notifyAll, notify, toString, wait, wait, wait
 

Field Detail

DES_KEY_LEN

public static final int DES_KEY_LEN
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.
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, as the key material for the DES key.
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, is shorter than 8 bytes.
Method Detail

getKey

public byte[] getKey()
Returns the DES key material.
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, 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, is shorter than 8 bytes.

isWeak

public static boolean isWeak(byte[] key,
                             int offset)
                     throws java.security.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:
java.security.InvalidKeyException - if the given key material, starting at offset, is shorter than 8 bytes.

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