add method

void add(String key, Hlc hlc)

Folds one record into the digest.

Implementation

void add(String key, Hlc hlc) {
  final hash = sha256.convert(
      [...utf8.encode(key), 0x00, ...utf8.encode(hlc.toString())]).bytes;
  for (var i = 0; i < 16; i++) {
    _xor[i] ^= hash[i];
  }
  _count++;
  if (_min == null || hlc < _min!) _min = hlc;
  if (_max == null || hlc > _max!) _max = hlc;
}