javax.crypto.spec
Class 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.
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.- 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 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.