javax.crypto.spec
Class DESKeySpec
java.lang.Object
|
+--javax.crypto.spec.DESKeySpec
- public class DESKeySpec
- extends java.lang.Object
- implements java.security.spec.KeySpec
A class that provides a specification for a DES key.
- See Also:
Key
,
java.security.KeyFactory
,
KeySpec
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, starting at offset, is parity-adjusted. |
static boolean |
isWeak(byte[] key,
int offset)
DES has a number of weak keys. |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
ident
public static final java.lang.String ident
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
- 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.
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, starting at offset, is parity-adjusted.
- Parameters:
key
- 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
- DES has a number of weak keys. This method will check
if the given DES key material is weak or semi-weak.
See "Applied
Cryptography" by Bruce Schneier for more information.
- 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.