PWrzesinski

// I put this together from 2 sources:
// - https://github.com/cyrildever/feistel-cipher
// - https://stackoverflow.com/a/12590064/2786606
//
// In particular, Daniel Vérité wrote a great answer on SO.
//
// I save this for myself, there are no guarantees about correctness, quality, or anything else.

import 'dart:convert';
import 'package:crypto/crypto.dart';