RPG Maker VX Ace lifted decrypter

decrypt-lifted.js

var fs = require("fs");
let decryptionAESKey =
  "02f3ffa287f78ba68c60f24f79c6fb18ce32b4ebaadac11af5ace8c67a50ae9f";

Decrypter = {};
Decrypter._headerlength = 16;
Decrypter._encryptionKey = "";
Decrypter.SIGNATURE = "5250474d56000000";
Decrypter.VER = "000301";
Decrypter.REMAIN = "0000000000";

Decrypter.decryptArrayBuffer = function (arrayBuffer) {
  var header = new Uint8Array(arrayBuffer, 0, this._headerlength);

  var i;
  var ref = this.SIGNATURE + this.VER + this.REMAIN;
  var refBytes = new Uint8Array(16);
  for (i = 0; i < this._headerlength; i++) {
    refBytes[i] = parseInt("0x" + ref.substr(i * 2, 2), 16);
  }
  for (i = 0; i < this._headerlength; i++) {
    if (header[i] !== refBytes[i]) {
      throw new Error("Header is wrong");
    }
  }

  arrayBuffer = this.cutArrayHeader(arrayBuffer, Decrypter._headerlength);
  var view = new DataView(arrayBuffer);
  this.readEncryptionkey();
  if (arrayBuffer) {
    var byteArray = new Uint8Array(arrayBuffer);
    for (i = 0; i < this._headerlength; i++) {
      byteArray[i] = byteArray[i] ^ parseInt(Decrypter._encryptionKey[i], 16);
      view.setUint8(i, byteArray[i]);
    }
  }

  return arrayBuffer;
};

Decrypter.readEncryptionkey = function () {
  this._encryptionKey = decryptionAESKey.split(/(.{2})/).filter(Boolean);
};

let buf = fs.readFileSync("../img/pictures/ashley_final_warning.k9a").buffer;
Decrypter.decryptArrayBuffer(buf);