Class DESedeKeySpec
- java.lang.Object
-
- javax.crypto.spec.DESedeKeySpec
- All Implemented Interfaces:
KeySpec
public class DESedeKeySpec extends Object implements KeySpec
This class specifies a DES-EDE ("triple-DES") key.
- Since:
- 1.4
Field Summary
Modifier and Type | Field | Description |
---|---|---|
static int | DES_EDE_KEY_LEN | The constant which defines the length of a DESede key in bytes. |
Constructor Summary
Constructor | Description |
---|---|
DESedeKeySpec(byte[] key) | Creates a DESedeKeySpec object using the first 24 bytes in |
DESedeKeySpec(byte[] key,
int offset) | Creates a DESedeKeySpec object using the first 24 bytes in |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
byte[] | getKey() | Returns the DES-EDE key. |
static boolean | isParityAdjusted(byte[] key,
int offset) | Checks if the given DES-EDE key, starting at |
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Field Detail
DES_EDE_KEY_LEN
public static final int DES_EDE_KEY_LEN
The constant which defines the length of a DESede key in bytes.
- See Also:
- Constant Field Values
Constructor Detail
DESedeKeySpec
public DESedeKeySpec(byte[] key) throws InvalidKeyException
Creates a DESedeKeySpec object using the first 24 bytes in key
as the key material for the DES-EDE key.
The bytes that constitute the DES-EDE key are those between key[0]
and key[23]
inclusive
- Parameters:
-
key
- the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification. - Throws:
-
NullPointerException
- ifkey
is null. -
InvalidKeyException
- if the given key material is shorter than 24 bytes.
DESedeKeySpec
public DESedeKeySpec(byte[] key, int offset) throws InvalidKeyException
Creates a DESedeKeySpec object using the first 24 bytes in key
, beginning at offset
inclusive, as the key material for the DES-EDE key.
The bytes that constitute the DES-EDE key are those between key[offset]
and key[offset+23]
inclusive.
- Parameters:
-
key
- the buffer with the DES-EDE key material. The first 24 bytes of the buffer beginning atoffset
inclusive are copied to protect against subsequent modification. -
offset
- the offset inkey
, where the DES-EDE key material starts. - Throws:
-
NullPointerException
- ifkey
is null. -
InvalidKeyException
- if the given key material, starting atoffset
inclusive, is shorter than 24 bytes
Method Detail
getKey
public byte[] getKey()
Returns the DES-EDE key.
- Returns:
- the DES-EDE key. Returns a new array each time this method is called.
isParityAdjusted
public static boolean isParityAdjusted(byte[] key, int offset) throws InvalidKeyException
Checks if the given DES-EDE key, starting at offset
inclusive, is parity-adjusted.
- Parameters:
-
key
- a byte array which holds the key value -
offset
- the offset into the byte array - Returns:
- true if the given DES-EDE key is parity-adjusted, false otherwise
- Throws:
-
NullPointerException
- ifkey
is null. -
InvalidKeyException
- if the given key material, starting atoffset
inclusive, is shorter than 24 bytes