メソッドの詳細

• init

  void init​(byte[] key)
     throws java.lang.IllegalArgumentException

  Initialise the MAC.

  パラメータ:

  key - the key required by the MAC.

  例外:

  java.lang.IllegalArgumentException - if the params argument is inappropriate.

• getAlgorithmName

  java.lang.String getAlgorithmName​()

  Return the name of the algorithm the MAC implements.

  戻り値:

  the name of the algorithm the MAC implements.

• getMacSize

  int getMacSize​()

  Return the block size for this cipher (in bytes).

  戻り値:

  the block size for this cipher in bytes.

• update

  void update​(byte in)
       throws java.lang.IllegalStateException

  add a single byte to the mac for processing.

  パラメータ:

  in - the byte to be processed.

  例外:

  java.lang.IllegalStateException - if the MAC is not initialised.

• update

  void update​(byte[] in,
              int inOff,
              int len)
       throws java.lang.IllegalStateException

  パラメータ:

  in - the array containing the input.

  inOff - the index in the array the data begins at.

  len - the length of the input starting at inOff.

  例外:

  java.lang.IllegalStateException - if the MAC is not initialised.

• doFinal

  int doFinal​(byte[] out,
              int outOff)
       throws java.lang.IllegalStateException

  Compute the final statge of the MAC writing the output to the out parameter.

  doFinal leaves the MAC in the same state it was after the last init.

  パラメータ:

  out - the array the MAC is to be output to.

  outOff - the offset into the out buffer the output is to start at.

  例外:

  java.lang.IllegalStateException - if the MAC is not initialised.

• reset

  void reset​()

  Reset the MAC. At the end of resetting the MAC should be in the in the same state it was after the last init (if there was one).