| java.lang.Object | |
| ↳ | javax.crypto.MacSpi |
 Known Direct Subclasses
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Class Overview
This class defines the Service Provider Interface (SPI)
for the 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.
Summary
| Public Constructors | |||||||||||
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| Public Methods | |||||||||||
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Returns a clone if the implementation is cloneable.
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| Protected Methods | |||||||||||
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Completes the MAC computation and resets the MAC for further use,
maintaining the secret key that the MAC was initialized with.
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Returns the length of the MAC in bytes.
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Initializes the MAC with the given (secret) key and algorithm
parameters.
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Resets the MAC for further use, maintaining the secret key that the
MAC was initialized with.
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Processes the first
len bytes in input,
starting at offset inclusive. | |||||||||||
Processes the given byte.
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Processes
input.remaining() bytes in the ByteBuffer
input, starting at input.position(). | |||||||||||
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Public Constructors
public MacSpi ()
Public Methods
public Object clone ()
Returns a clone if the implementation is cloneable.
Returns
- a clone if the implementation is cloneable.
Throws
| CloneNotSupportedException | if this is called
on an implementation that does not support Cloneable.
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Protected Methods
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.
Returns
- the MAC result.
protected abstract int engineGetMacLength ()
Returns the length of the MAC in bytes.
Returns
- the MAC length in bytes.
protected abstract void engineInit (Key key, AlgorithmParameterSpec params)
Initializes the MAC with the given (secret) key and algorithm parameters.
Parameters
| key | the (secret) key. |
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| params | the algorithm parameters. |
Throws
| InvalidKeyException | if the given key is inappropriate for initializing this MAC. |
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| InvalidAlgorithmParameterException | if the given algorithm parameters are inappropriate for this MAC. |
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, int offset, int len)
Processes the first len bytes in input,
starting at offset inclusive.
Parameters
| input | the input buffer. |
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| offset | the offset in input where the input starts. |
| len | the number of bytes to process. |
protected abstract void engineUpdate (byte input)
Processes the given byte.
Parameters
| input | the input byte to be processed. |
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protected void engineUpdate (ByteBuffer input)
Processes 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.
Parameters
| input | the ByteBuffer |
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