doFinal method

@override int doFinal(Uint8List out, int outOff)

Finish the operation either appending or verifying the MAC at the end of the data.

Returns the number of bytes written to the output.

Implementation

@override
int doFinal(Uint8List out, int outOff) {
  var result = remainingInput.isNotEmpty
      ? processBlock(remainingInput, 0, out, outOff)
      : 0;

  var len = Uint8List.view((Uint32List(4)
        ..[2] = aad!.length * 8
        ..[0] = _processedBytes * 8)
      .buffer);
  len = Uint8List.fromList(len.reversed.toList());

  _gHASHBlock(_x, len);

  _xor(_x, _e0);

  if (forEncryption) {
    out.setAll(outOff + result, _x);
    result += _x.length;
  }

  validateMac();

  return result;
}