IT. Expert System.

public class MyMacSpi
extends MacSpi

• Constructor Summary

  Constructors

  Constructor and Description
  MyMacSpi()

• Method Summary

  Methods

  Modifier and Type	Method and Description
  protected byte[]	engineDoFinal() Computes the digest of this MAC based on the data previously specified in MacSpi.engineUpdate(byte) calls.
  protected int	engineGetMacLength() Returns the length of this MAC (in bytes).
  protected void	engineInit(Key key, AlgorithmParameterSpec params) Initializes this MacSpi instance with the specified key and algorithm parameters.
  protected void	engineReset() Resets this MacSpi instance to its initial state.
  protected void	engineUpdate(byte input) Updates this MacSpi instance with the specified byte.
  protected void	engineUpdate(byte[] input, int offset, int len) Updates this MacSpi instance with the data from the specified buffer input from the specified offset and length len.

  • Methods inherited from class javax.crypto.MacSpi

    clone, engineUpdate

  • Methods inherited from class java.lang.Object

    equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Detail

  • MyMacSpi

    public MyMacSpi()

• Method Detail

  • engineGetMacLength

    protected int engineGetMacLength()

    Description copied from class: MacSpi
    Returns the length of this MAC (in bytes).

    Specified by:

    engineGetMacLength in class MacSpi

    Returns:

    the length of this MAC (in bytes).

  • engineInit

    protected void engineInit(Key key,
                  AlgorithmParameterSpec params)
                       throws InvalidKeyException,
                              InvalidAlgorithmParameterException

    Description copied from class: MacSpi
    Initializes this MacSpi instance with the specified key and algorithm parameters.

    Specified by:

    engineInit in class MacSpi

    Parameters:

    key - the key to initialize this algorithm.

    params - the parameters for this algorithm.

    Throws:

    InvalidKeyException - if the specified key cannot be used to initialize this algorithm, or it is null.

    InvalidAlgorithmParameterException - if the specified parameters cannot be used to initialize this algorithm.

  • engineUpdate

    protected void engineUpdate(byte input)

    Description copied from class: MacSpi
    Updates this MacSpi instance with the specified byte.

    Specified by:

    engineUpdate in class MacSpi

    Parameters:

    input - the byte.

  • engineUpdate

    protected void engineUpdate(byte[] input,
                    int offset,
                    int len)

    Description copied from class: MacSpi
    Updates this MacSpi instance with the data from the specified buffer input from the specified offset and length len.

    Specified by:

    engineUpdate in class MacSpi

    Parameters:

    input - the buffer.

    offset - the offset in the buffer.

    len - the length of the data in the buffer.

  • engineDoFinal

    protected byte[] engineDoFinal()

    Description copied from class: MacSpi
    Computes the digest of this MAC based on the data previously specified in MacSpi.engineUpdate(byte) calls.

    This MacSpi instance is reverted to its initial state and can be used to start the next MAC computation with the same parameters or initialized with different parameters.

    Specified by:

    engineDoFinal in class MacSpi

    Returns:

    the generated digest.

  • engineReset

    protected void engineReset()

    Description copied from class: MacSpi
    Resets this MacSpi instance to its initial state.

    This MacSpi instance is reverted to its initial state and can be used to start the next MAC computation with the same parameters or initialized with different parameters.

    Specified by:

    engineReset in class MacSpi