const mac = ""+serial-number+"";
document.getElementById("default-password").textContent = "The password is: " + gerador(mac); // output the generated key

function gerador(mac) {
  let key = "XXXXXXXXXXXXXXXXXXXX";
  for (let i = 0; i < mac.length; i++) {
    switch (i) {
      case 0:
        key = setCharAt(key, 1, dicionario(mac.charAt(i)));
        break;
      case 1:
        key = setCharAt(key, 3, dicionario(mac.charAt(i)));
        key = setCharAt(key, 12, dicionario(mac.charAt(i)));
        break;
      case 2:
        key = setCharAt(key, 5, dicionario(mac.charAt(i)));
        key = setCharAt(key, 17, dicionario(mac.charAt(i)));
        break;
      case 3:
        key = setCharAt(key, 7, dicionario(mac.charAt(i)));
        break;
      case 4:
        key = setCharAt(key, 9, dicionario(mac.charAt(i)));
        key = setCharAt(key, 18, dicionario(mac.charAt(i)));
        break;
      case 5:
        key = setCharAt(key, 11, dicionario(mac.charAt(i)));
        break;
      case 6:
        key = setCharAt(key, 10, dicionario(mac.charAt(i)));
        key = setCharAt(key, 13, dicionario(mac.charAt(i)));
        break;
      case 7:
        key = setCharAt(key, 8, dicionario(mac.charAt(i)));
        break;
      case 8:
        key = setCharAt(key, 6, dicionario(mac.charAt(i)));
        key = setCharAt(key, 14, dicionario(mac.charAt(i)));
        break;
      case 9:
        key = setCharAt(key, 15, dicionario(mac.charAt(i)));
        key = setCharAt(key, 4, dicionario(mac.charAt(i)));
        break;
      case 10:
        key = setCharAt(key, 2, dicionario(mac.charAt(i)));
        key = setCharAt(key, 19, dicionario(mac.charAt(i)));
        break;
      case 11:
        key = setCharAt(key, 0, dicionario(mac.charAt(i)));
        key = setCharAt(key, 16, dicionario(mac.charAt(i)));
        break;
    }
  }
  return key;
}

function dicionario(letra) {
  letra = letra.toUpperCase();
  switch (letra) {
    case "1":
      return "r";
      break;
    case "2":
      return "q";
      break;
    case "3":
      return "a";
      break;
    case "4":
      return "H";
      break;
    case "5":
      return "N";
      break;
    case "6":
      return "p";
      break;
    case "7":
      return "d";
      break;
    case "8":
      return "S";
      break;
    case "9":
      return "Y";
      break;
    case "0":
      return "X";
      break;
    case "A":
      return "w";
      break;
    case "B":
      return "8";
      break;
    case "C":
      return "6";
      break;
    case "D":
      return "2";
      break;
    case "E":
      return "1";
      break;
    case "F":
      return "5";
      break;
    default:
      return
      }