Java compact1, compact2, compact3 javax.crypto Class MacSpi（JDK8）

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(Key key,
                                     AlgorithmParameterSpec params)
                              throws InvalidKeyException,
                                     InvalidAlgorithmParameterException

  Initializes the MAC with the given (secret) key and algorithm parameters.

  Parameters:

  key - the (secret) key.

  params - the algorithm parameters.

  Throws:

  InvalidKeyException - if the given key is inappropriate for initializing this MAC.

  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 inclusive.

  Parameters:

  input - the input buffer.

  offset - the offset in input where the input starts.

  len - the number of bytes to process.

• engineUpdate

  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

  Since:

  1.5

• 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 Object clone()
               throws CloneNotSupportedException

  Returns a clone if the implementation is cloneable.

  Overrides:

  clone in class Object

  Returns:

  a clone if the implementation is cloneable.

  Throws:

  CloneNotSupportedException - if this is called on an implementation that does not support Cloneable.

  See Also:

  Cloneable