xor function

Uint8List xor(List<int> aList, List<int> bList)

Performs an XOR operation between two byte arrays aList and bList.

If an array is smaller, the missing bytes are considered 0. Returns um Uint8List as the result of XOR byte by byte.

Implementation

Uint8List xor(List<int> aList, List<int> bList) {
  final a = Uint8List.fromList(aList);
  final b = Uint8List.fromList(bList);
  if (a.isEmpty || b.isEmpty) {
    throw ArgumentError("Uint8List arguments must not be empty");
  }
  final length = a.length > b.length ? a.length : b.length;
  final buffer = Uint8List(length);

  for (int i = 0; i < length; i++) {
    final aa = i < a.length ? a[i] : 0;
    final bb = i < b.length ? b[i] : 0;
    buffer[i] = aa ^ bb;
  }
  return buffer;
}