This class specifies a DES-EDE ("triple-DES") key.
Constant Summary
int | DES_EDE_KEY_LEN | The constant which defines the length of a DESede key in bytes. |
Public Constructor Summary
DESedeKeySpec(byte[] key)
Creates a DESedeKeySpec object using the first 24 bytes in
key as the key material for the DES-EDE key. |
|
DESedeKeySpec(byte[] key, int offset)
Creates a DESedeKeySpec object using the first 24 bytes in
key , beginning at offset inclusive,
as the key material for the DES-EDE key. |
Public Method Summary
byte[] |
getKey()
Returns the DES-EDE key.
|
static boolean |
isParityAdjusted(byte[] key, int offset)
Checks if the given DES-EDE key, starting at
offset
inclusive, is parity-adjusted. |
Inherited Method Summary
Constants
public static final int DES_EDE_KEY_LEN
The constant which defines the length of a DESede key in bytes.
Public Constructors
public DESedeKeySpec (byte[] key)
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 | if key is null. |
---|---|
InvalidKeyException | if the given key material is shorter than 24 bytes. |
public DESedeKeySpec (byte[] key, int offset)
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 at offset inclusive
are copied to protect against subsequent modification. |
---|---|
offset | the offset in key , where the DES-EDE key
material starts. |
Throws
NullPointerException | if key is null. |
---|---|
InvalidKeyException | if the given key material, starting at
offset inclusive, is shorter than 24 bytes
|
Public Methods
public byte[] getKey ()
Returns the DES-EDE key.
Returns
- the DES-EDE key. Returns a new array each time this method is called.
public static boolean isParityAdjusted (byte[] key, int offset)
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 | if key is null. |
---|---|
InvalidKeyException | if the given key material, starting at
offset inclusive, is shorter than 24 bytes
|