generateUuid function

Implementation

String generateUuid() {
  final random = Random.secure();
  final values = List<int>.generate(16, (i) => random.nextInt(256));

  values[6] = (values[6] & 0x0f) | 0x40; // version 4
  values[8] = (values[8] & 0x3f) | 0x80; // variant RFC4122

  String hex(int val) => val.toRadixString(16).padLeft(2, '0');

  return '${hex(values[0])}${hex(values[1])}${hex(values[2])}${hex(values[3])}-'
      '${hex(values[4])}${hex(values[5])}-'
      '${hex(values[6])}${hex(values[7])}-'
      '${hex(values[8])}${hex(values[9])}-'
      '${hex(values[10])}${hex(values[11])}${hex(values[12])}${hex(values[13])}${hex(values[14])}${hex(values[15])}';
}