createRowHash.dart

Future<String> _createRowHash(String tableName, packed, {time, String salt}) async {
  if (time == null) {
    time = new DateTime.now().millisecondsSinceEpoch;
  }

  if (time is String) {
    time = DateTime.parse(time).millisecondsSinceEpoch;
  }

  if (time is DateTime) {
    time = time.millisecondsSinceEpoch;
  }

  if (salt == null) {
    salt = await generateStrongToken(length: 10);
  }

  tableName = _createHash(tableName);
  packed = _createHash(packed);
  time = _createHash(time.toString());
  salt = _createHash(salt);
  return _createHash("${tableName}-${packed}-${time}-${salt}");
}

String _createHash(input) {
  if (input is String) {
    input = const Utf8Encoder().convert(input);
  }

  var sha = new SHA256();
  sha.add(input);
  return CryptoUtils.bytesToHex(sha.close());
}