|
Préférences
Moteurs de recherche
|
||||||||||||||||||||
JavaTM 2 Platform Std. Ed. v1.6.0
javax.crypto.spec
|
Field Summary | |
---|---|
static int |
DES_KEY_LEN
The constant which defines the length of a DES key in bytes. |
Constructor Summary | |
---|---|
DESKeySpec(byte[] key)
Creates a DESKeySpec object using the first 8 bytes in key as the key material for the DES key. |
|
DESKeySpec(byte[] key,
int offset)
Creates a DESKeySpec object using 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 |
Field Detail |
---|
public static final int DES_KEY_LEN
Constructor Detail |
---|
public DESKeySpec(byte[] key) throws InvalidKeyException
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.
key
- the buffer with the DES key material. The first 8 bytes
of the buffer are copied to protect against subsequent modification.
NullPointerException
- if the given key material is
null
InvalidKeyException
- if the given key material is shorter
than 8 bytes.public DESKeySpec(byte[] key, int offset) throws InvalidKeyException
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.
key
- the buffer with the DES key material. The first 8 bytes
of the buffer beginning at offset
inclusive are copied
to protect against subsequent modification.offset
- the offset in key
, where the DES key
material starts.
NullPointerException
- if the given key material is
null
InvalidKeyException
- if the given key material, starting at
offset
inclusive, is shorter than 8 bytes.Method Detail |
---|
public byte[] getKey()
public static boolean isParityAdjusted(byte[] key, int offset) throws InvalidKeyException
offset
inclusive, is parity-adjusted.
key
- the buffer with the DES key material.offset
- the offset in key
, where the DES key
material starts.
InvalidKeyException
- if the given key material is
null
, or starting at offset
inclusive, is
shorter than 8 bytes.public static boolean isWeak(byte[] key, int offset) throws InvalidKeyException
key
- the buffer with the DES key material.offset
- the offset in key
, where the DES key
material starts.
InvalidKeyException
- if the given key material is
null
, or starting at offset
inclusive, is
shorter than 8 bytes.