init method

@override void init(covariant KeyParameter params)

Init the MAC with its initialization params. The type of CipherParameters depends on the algorithm being used (see the documentation of each implementation to find out more).

Implementation

@override
void init(covariant KeyParameter params) {
  _digest.reset();

  var key = params.key;
  var keyLength = key.length;

  if (keyLength > _blockLength) {
    _digest.update(key, 0, keyLength);
    _digest.doFinal(_inputPad, 0);

    keyLength = _digestSize;
  } else {
    _inputPad.setRange(0, keyLength, key);
  }

  _inputPad.fillRange(keyLength, _inputPad.length, 0);

  _outputBuf.setRange(0, _blockLength, _inputPad);

  _xorPad(_inputPad, _blockLength, _ipad);
  _xorPad(_outputBuf, _blockLength, _opad);

  _digest.update(_inputPad, 0, _inputPad.length);
}