processInPlace method

void processInPlace(Uint8List data, [ int start = 0, int? end ])

XORs the keystream over data[start..end) in place.

Implementation

void processInPlace(Uint8List data, [int start = 0, int? end]) {
  final stop = RangeError.checkValidRange(start, end, data.length);
  for (var i = start; i < stop; i++) {
    if (_used == 16) {
      _cipher.encryptBlock(_counter, 0, _keystream, 0);
      _used = 0;
      // Little-endian increment for the *next* block.
      for (var j = 0; j < 16; j++) {
        _counter[j] = (_counter[j] + 1) & 0xFF;
        if (_counter[j] != 0) break;
      }
    }
    data[i] ^= _keystream[_used++];
  }
}