for (int i = 0; i < string.length(); i++) {
      bytes[i] = (byte) string.charAt(i);
    }
    return bytes;
  }

  interface HashFn {
    byte[] hash(byte[] input, int seed);
  }

  static void verifyHashFunction(HashFn hashFunction, int hashbits, int expected) {
    int hashBytes = hashbits / 8;

    byte[] key = new byte[256];
    byte[] hashes = new byte[hashBytes * 256];