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java.lang.Objectjavax.crypto.spec.DESKeySpec
public class DESKeySpec
This class is a transparent wrapper for DES keys, which are arrays of 8 bytes.
| Field Summary | |
|---|---|
static int |
DES_KEY_LEN
The length of a DES key, in bytes. |
| Constructor Summary | |
|---|---|
DESKeySpec(byte[] key)
Create a new DES key spec, copying the first 8 bytes from the byte array. |
|
DESKeySpec(byte[] key,
int offset)
Create a new DES key spec, starting at offset in
the byte array. |
|
| Method Summary | |
|---|---|
byte[] |
getKey()
Return the key as a byte array. |
static boolean |
isParityAdjusted(byte[] key,
int offset)
Returns whether or not the given key is parity adjusted; i.e. every byte in the key has an odd number of "1" bits. |
static boolean |
isWeak(byte[] key,
int offset)
Tests if the bytes between [offset, offset+7]
constitute a weak or semi-weak DES key. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
public static final int DES_KEY_LEN
| Constructor Detail |
|---|
public DESKeySpec(byte[] key)
throws InvalidKeyException
key - The key bytes.
InvalidKeyException - If there are less than 8
bytes in the array.
public DESKeySpec(byte[] key,
int offset)
throws InvalidKeyException
offset in
the byte array. The first 8 bytes starting at offset
are copied.
key - The key bytes.offset - The offset into the byte array at which to begin.
InvalidKeyException - If there are less than 8
bytes starting at offset.| Method Detail |
|---|
public static boolean isParityAdjusted(byte[] key,
int offset)
throws InvalidKeyException
key - The key bytes, considered between [offset,
offset+7]offset - The offset into the byte array at which to begin.
InvalidKeyException - If there are not enough
bytes in the array.
public static boolean isWeak(byte[] key,
int offset)
throws InvalidKeyException
[offset, offset+7]
constitute a weak or semi-weak DES key.
key - The key bytes to check.offset - The offset in the byte array to start.
InvalidKeyExceptionpublic byte[] getKey()
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