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Class javax.crypto.MacSpi

java.lang.Object
    |
    +----javax.crypto.MacSpi

public abstract class MacSpi
extends java.lang.Object
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()
 
 

Method Summary
java.lang.Object  clone()
Returns a clone if the implementation is cloneable.
byte[]  engineDoFinal()
Completes the MAC computation and resets the MAC for further use, maintaining the secret key that the MAC was initialized with.
int  engineGetMacLength()
Returns the length of the MAC in bytes.
void  engineInit(java.security.Key key, java.security.spec.AlgorithmParameterSpec params)
Initializes the MAC with the given (secret) key and algorithm parameters.
void  engineReset()
Resets the MAC for further use, maintaining the secret key that the MAC was initialized with.
void  engineUpdate(byte input)
Processes the given byte.
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
 clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MacSpi

public MacSpi()
Method Detail

engineGetMacLength

protected abstract int engineGetMacLength()
Returns the length of the MAC in bytes.
Returns:
the MAC length in bytes.

engineInit

protected abstract void engineInit(java.security.Key key,
                                   java.security.spec.AlgorithmParameterSpec params) throws java.security.InvalidKeyException, java.security.InvalidAlgorithmParameterException
Initializes the MAC with the given (secret) key and algorithm parameters.
Parameters:
key - the (secret) key.
params - the algorithm parameters.
Throws:
java.security.InvalidKeyException - if the given key is inappropriate for initializing this MAC.
java.security.InvalidAlgorithmParameterException - if the given algorithm parameters are inappropriate for this MAC.

engineUpdate

protected abstract void engineUpdate(byte input)
Processes the given byte.
Parameters:
input - the input byte to be processed.

engineUpdate

protected abstract void engineUpdate(byte[] input,
                                     int offset,
                                     int len)
Processes the first len bytes in input, starting at offset.
Parameters:
input - the input buffer.
offset - the offset in input where the input starts.
len - the number of bytes to process.

engineDoFinal

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.

engineReset

protected abstract void engineReset()
Resets the MAC for further use, maintaining the secret key that the MAC was initialized with.

clone

public java.lang.Object clone() throws java.lang.CloneNotSupportedException
Returns a clone if the implementation is cloneable.
Returns:
a clone if the implementation is cloneable.
Throws:
java.lang.CloneNotSupportedException - if this is called on an implementation that does not support Cloneable.
Overrides:
clone in class java.lang.Object

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