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java.lang.Object | +--javax.crypto.MacSpi
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.
Constructor Summary | |
MacSpi()
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Method Summary | |
java.lang.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 initialised with. |
protected abstract int |
engineGetMacLength()
Returns the length of the MAC in bytes. |
protected abstract void |
engineInit(java.security.Key key,
java.security.spec.AlgorithmParameterSpec params)
Initialises 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 initialised 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. |
Methods inherited from class java.lang.Object |
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Constructor Detail |
public MacSpi()
Method Detail |
protected abstract int engineGetMacLength()
protected abstract void engineInit(java.security.Key key, java.security.spec.AlgorithmParameterSpec params) throws java.security.InvalidKeyException, java.security.InvalidAlgorithmParameterException
key
- the (secret) key.params
- the algorithm parameters.protected abstract void engineUpdate(byte input)
input
- the input byte to be processed.protected abstract void engineUpdate(byte[] input, int offset, int len)
input
- the input buffer.offset
- the offset in input where the input starts.len
- the number of bytes to process.protected abstract byte[] engineDoFinal()
protected abstract void engineReset()
public java.lang.Object clone() throws java.lang.CloneNotSupportedException
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