public abstract class MacSpi extends Object
Mac class.
All the abstract methods in this class must be implemented by each
cryptographic service provider who wishes to supply the implementation
of a particular MAC algorithm.
Implementations are free to implement the Cloneable interface.
| Constructor and Description |
|---|
MacSpi() |
| Modifier and Type | Method and Description |
|---|---|
Object |
clone()
Returns a clone if the implementation is cloneable.
|
protected abstract byte[] |
engineDoFinal()
Completes the MAC computation and resets the MAC for further use,
maintaining the secret key that the MAC was initialized with.
|
protected abstract int |
engineGetMacLength()
Returns the length of the MAC in bytes.
|
protected abstract void |
engineInit(Key key,
AlgorithmParameterSpec params)
Initializes the MAC with the given (secret) key and algorithm
parameters.
|
protected abstract void |
engineReset()
Resets the MAC for further use, maintaining the secret key that the
MAC was initialized with.
|
protected abstract void |
engineUpdate(byte input)
Processes the given byte.
|
protected abstract void |
engineUpdate(byte[] input,
int offset,
int len)
Processes the first
len bytes in input,
starting at offset inclusive. |
protected void |
engineUpdate(ByteBuffer input)
Processes
input.remaining() bytes in the ByteBuffer
input, starting at input.position(). |
protected abstract int engineGetMacLength()
protected abstract void engineInit(Key key, AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException
key - the (secret) key.params - the algorithm parameters.InvalidKeyException - if the given key is inappropriate for
initializing this MAC.InvalidAlgorithmParameterException - if the given algorithm
parameters are inappropriate for this MAC.protected abstract void engineUpdate(byte input)
input - the input byte to be processed.protected abstract void engineUpdate(byte[] input,
int offset,
int len)
len bytes in input,
starting at offset inclusive.input - the input buffer.offset - the offset in input where the input starts.len - the number of bytes to process.protected void engineUpdate(ByteBuffer input)
input.remaining() bytes in the ByteBuffer
input, starting at input.position().
Upon return, the buffer's position will be equal to its limit;
its limit will not have changed.
Subclasses should consider overriding this method if they can process ByteBuffers more efficiently than byte arrays.
input - the ByteBufferprotected abstract byte[] engineDoFinal()
protected abstract void engineReset()
public Object clone() throws CloneNotSupportedException
clone in class ObjectCloneNotSupportedException - if this is called
on an implementation that does not support Cloneable.Cloneable Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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