javax.crypto.spec
Class DESKeySpec
java.lang.Object
|
+--javax.crypto.spec.DESKeySpec
- All Implemented Interfaces:
- java.security.spec.KeySpec
- public class DESKeySpec
- extends java.lang.Object
- implements java.security.spec.KeySpec
This class specifies a DES key.
|
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[] |
getKey()
Returns the DES key material. |
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 java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
DES_KEY_LEN
public static final int DES_KEY_LEN
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.
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
inclusive, is parity-adjusted.
- 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.
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
inclusive, is shorter than 8 bytes.