ketsu key algorithm reverse engineered

algorithm.js

// NOTE: Most if not all of these console.logs were in the original obfuscated code, I commented most of them. :)


function generateUUID() {
  var _0x3e34f1 = new Date().getTime();
  var _0x96f645 =
    (typeof performance !== "undefined" &&
      performance.now &&
      performance.now() * 1000) ||
    0;
  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(
    /[xy]/g,
    function (_0x396bdd) {
      var _0x45adf8 = Math.random() * 16;
      if (_0x3e34f1 > 0) {
        _0x45adf8 = (_0x3e34f1 + _0x45adf8) % 16 | 0;
        _0x3e34f1 = Math.floor(_0x3e34f1 / 16);
      } else {
        _0x45adf8 = (_0x96f645 + _0x45adf8) % 16 | 0;
        _0x96f645 = Math.floor(_0x96f645 / 16);
      }
      return (_0x396bdd === "x" ? _0x45adf8 : (_0x45adf8 & 3) | 8).toString(16);
    }
  );
}

// generate a random word with letters a-z with a certain length
function makeWord(length) {
  var str = "";
  var alphabet = "abcdefghijklmnopqrstuvwxyz";
  for (var i = 0; i < length; i++) {
    str += alphabet.charAt(Math.floor(Math.random() * alphabet.length));
  }
  return str;
}

var generateKetsuLink = function (urlStr) {
  var url = new URL(urlStr);
  var params = new URLSearchParams(url.search);
  var key = "";
  var otherParams = [];
  var paramIndex = 0;
  for (var param of params.entries()) {
    if (paramIndex == 0) {
      // first parameter checked
      key = param[1];
    }
    if (paramIndex == 1) {
      // second parameter checked
      secondParam = param[1];
    } else if (paramIndex > 1) {
      // any other parameters
      otherParams.push(param[1]);
    }
    paramIndex++;
  }
  var hourInRussia = (new Date().getUTCHours() + 9) % 24;
  if (hourInRussia == 0) {
    // hour in asia has to be 1 or more now
    hourInRussia = 1;
  }

  hourInRussia = hourInRussia * 2; // hour in asia multiplied by 2
  //   var hourInAsiaDigits = ("" + hourInAsia).split(""); // turn it into a string and split it into an array of digits

  var _0x285114 = "";
  for (var i = 0; i < otherParams.length; i++) {
    var paramSplit = otherParams[i].split("");
    if (otherParams[i] == otherParams[hourInRussia % otherParams.length]) {
      console.log("this one rocks" + paramSplit);
      continue;
    }

    // loop through every character in the current parameter
    var _0x509a26 = false;
    for (var j = 0; j < paramSplit.length; j++) {
      var letter = paramSplit[j];
      if (j + 4 > paramSplit.length - 1) {
        // make sure we only loop until paramSplit.length - 4 or 5
        continue;
      }

      var _0x473ae6 = false;
      for (var _0x136aca = 0; _0x136aca < 4; _0x136aca++) {
        if (paramSplit[j + _0x136aca] == "-") {
          _0x473ae6 = true;
          break;
        }
      }
      if (_0x473ae6) {
        continue;
      }
      //   console.log("here");
      var _0x5cad38 = parseInt(paramSplit[j]);
      var _0x23026a = parseInt(paramSplit[j + 1]);
      //   console.log(_0x5cad38, _0x23026a);
      if (isNaN(_0x5cad38) && isNaN(_0x23026a)) {
        _0x509a26 = true;
        for (
          var _0x5147de = j + 2;
          _0x5147de < paramSplit.length;
          _0x5147de++
        ) {
          var _0x166b9c = paramSplit[_0x5147de];
          var _0x2d16c7 = parseInt(_0x166b9c);
          if (!isNaN(_0x2d16c7)) {
            _0x285114 = _0x285114 + paramSplit[_0x5147de];
          } else {
            break;
          }
        }
        // console.log(paramSplit);
        break;
      }
    }
    if (_0x509a26) {
      //   console.log(_0x285114);
      break;
    }
  }
  var weirdNum = 0;
  for (var i = 0; i < otherParams.length; i++) {
    var paramSplit = otherParams[i].split("");
    if (otherParams[i] == otherParams[hourInRussia % otherParams.length]) {
      //   console.log("this one rocks" + paramSplit);
      continue;
    }
    for (var j = 0; j < paramSplit.length; j++) {
      var letter = paramSplit[j];
      var _0x3a2dc9 = parseInt(letter);
      if (isNaN(_0x3a2dc9)) {
        _0x3a2dc9 = 0;
      }
      if (j % 2 == 0) {
        weirdNum = weirdNum + _0x3a2dc9;
      } else {
        weirdNum = weirdNum - _0x3a2dc9;
      }
    }
  }
  if (weirdNum < 0) {
    weirdNum = weirdNum * -1;
  }
  //   console.log(weirdNum);
  var _0x4fd668 = [];
  var _0x27ad78 = otherParams[hourInRussia % otherParams.length].split("");
  for (p of weirdNum.toString().split("")) {
    _0x4fd668.push(_0x27ad78.pop());
  }
  _0x4fd668.reverse();
  _0x4fd668 = _0x4fd668.join("");
  if (weirdNum == parseInt(_0x4fd668)) {// somehow this is used to check if a link is expired or not, weird.
    // console.log("we are gucci bro"); 
  } else {
    //window.location.href = red;
    console.log("we not gucci");
    return;
  }
  //   console.log("thisi is v", _0x285114);
  if (_0x285114 == "0") {
    var _0x3eedd5 = [];
    var _0x46acdf = "";
    var _0x26a2ec = 10 + Math.floor(Math.random() * 6);
    for (var i = 0; i < _0x26a2ec; i++) {
      if (i == _0x26a2ec - 1) {
        var _0x19e702 = generateUUID().split("");
        // console.log(_0x19e702.join());
        var _0x4951df = (otherParams.length + "").split("");
        for (var _0x5147de = 0; _0x5147de < _0x4951df.length; _0x5147de++) {
          _0x19e702[_0x5147de] = _0x4951df[_0x5147de];
        }
        _0x19e702[_0x4951df.length] = makeWord(1);
        _0x46acdf = _0x19e702.join("");
        // console.log("important id" + _0x46acdf);
        continue;
      }
      _0x3eedd5.push(generateUUID());
    }
    var _0x509a26 = false;
    for (var i = 0; i < _0x3eedd5.length; i++) {
      var _0x6462dd = _0x3eedd5[i].split("");
      if (_0x3eedd5[i] == _0x3eedd5[hourInRussia % _0x3eedd5.length]) {
        // console.log("this one rocks" + _0x3eedd5[i]);
        continue;
      }
      for (var j = 0; j < _0x6462dd.length; j++) {
        var letter = _0x6462dd[j];
        if (j + 1 + 2 + 1 > _0x6462dd.length - 1) {
          continue;
        }
        var _0x473ae6 = false;
        for (var _0x136aca = 0; _0x136aca < 4; _0x136aca++) {
          if (_0x6462dd[j + _0x136aca] == "-") {
            _0x473ae6 = true;
            break;
          }
        }
        if (_0x473ae6) {
          continue;
        }
        var _0x5cad38 = parseInt(_0x6462dd[j]);
        var _0x23026a = parseInt(_0x6462dd[j + 1]);
        // console.log(_0x5cad38, _0x23026a);
        if (isNaN(_0x5cad38) && isNaN(_0x23026a)) {
          _0x509a26 = true;
          var _0x5363ec = _0x285114.split("");
          for (var _0x5147de = 0; _0x5147de < _0x5363ec.length; _0x5147de++) {
            _0x6462dd[j + 1 + (_0x5147de + 1)] = _0x5363ec[_0x5147de];
          }
          if (!isNaN(parseInt(_0x6462dd[j + 1 + _0x5363ec.length + 1]))) {
            _0x6462dd[j + 1 + _0x5363ec.length + 1] = makeWord(1);
          }
          _0x3eedd5[i] = _0x6462dd.join("");
          //   console.log("THIS IS THE ID WITH THE VERSION MY G", _0x3eedd5[i]);
          break;
        }
      }
      if (_0x509a26) {
        break;
      }
    }
    if (!_0x509a26) {
      var _0x4c919b = 0;
      if (_0x4c919b == hourInRussia % _0x3eedd5.length) {
        _0x4c919b = 1;
      }
      var _0x34c368 = _0x3eedd5[_0x4c919b].split("");
      _0x34c368[0] = makeWord(1);
      _0x34c368[1] = makeWord(1);
      for (var i = 0; i < _0x285114.split("").length; i++) {
        _0x34c368[1 + (i + 1)] = _0x285114.split("")[i];
      }
      _0x34c368[1 + _0x285114.split("").length + 1] = makeWord(1);
      _0x3eedd5[_0x4c919b] = _0x34c368.join("");
    }
    weirdNum = 0;
    for (var i = 0; i < _0x3eedd5.length; i++) {
      var paramSplit = _0x3eedd5[i].split("");
      if (_0x3eedd5[i] == _0x3eedd5[hourInRussia % _0x3eedd5.length]) {
        // console.log("this one rocks" + paramSplit);
        continue;
      }
      for (var j = 0; j < paramSplit.length; j++) {
        var letter = paramSplit[j];
        var _0x3a2dc9 = parseInt(letter);
        if (isNaN(_0x3a2dc9)) {
          _0x3a2dc9 = 0;
        }
        if (j % 2 == 0) {
          weirdNum = weirdNum - _0x3a2dc9;
        } else {
          weirdNum = weirdNum + _0x3a2dc9;
        }
      }
    }
    if (weirdNum < 0) {
      weirdNum = weirdNum * -1;
    }
    var _0x27ad78 = _0x3eedd5[hourInRussia % _0x3eedd5.length].split("");
    var _0x6c401 = ("" + weirdNum).split("");
    for (var _0x5147de = 0; _0x5147de < _0x6c401.length; _0x5147de++) {
      _0x27ad78.pop();
    }
    _0x27ad78 = _0x27ad78.join("") + _0x6c401.join("");
    _0x3eedd5[hourInRussia % _0x3eedd5.length] = _0x27ad78;
    // console.log("this is select", _0x27ad78);
  }

  var _0x122465 = url.search;
  var _0x575984 = [];
  for (var _0x694e88 = 0; _0x694e88 < _0x3eedd5.length; _0x694e88++) {
    var _0x16e532 = makeWord(3);
    while (_0x575984.includes(_0x16e532)) {
      _0x16e532 = makeWord(3);
    }
    _0x122465 = _0x122465 + "&" + _0x16e532 + "=" + _0x3eedd5[_0x694e88];
  }
  var _0x16e532 = makeWord(3);
  while (_0x575984.includes(_0x16e532)) {
    _0x16e532 = makeWord(3);
  }
  _0x122465 = _0x122465 + "&" + _0x16e532 + "=" + _0x46acdf;
  _0x122465 = "ketsuapp://?advertising=" + encodeURIComponent(_0x122465);
  return _0x122465;
};