using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using HarmonyLib;

namespace ConsoleApp1 {
   class Program {
      static Stream Decry(string FileName, int type) {
         // This is just a demonstration, this method should not run because default(Stream) is null
         byte[] array = File.ReadAllBytes(FileName);
         TripleDESCryptoServiceProvider tripleDESCryptoServiceProvider = new TripleDESCryptoServiceProvider();
         MD5CryptoServiceProvider md5CryptoServiceProvider = new MD5CryptoServiceProvider();
         tripleDESCryptoServiceProvider.Key = md5CryptoServiceProvider.ComputeHash(default(Stream));
         tripleDESCryptoServiceProvider.Mode = CipherMode.ECB;
         ICryptoTransform cryptoTransform = tripleDESCryptoServiceProvider.CreateDecryptor();
         byte[] array2 = array;
         array2 = cryptoTransform.TransformFinalBlock(array2, 0, array2.Length);
         return new MemoryStream(array2);
      }
      static Stream StandInMethod1(string FileName, int type) {
         return null;
      }
      static Program StandInMethod2(string FileName, int type) {
         byte[] array;
         TripleDESCryptoServiceProvider tripleDESCryptoServiceProvider;
         MD5CryptoServiceProvider md5CryptoServiceProvider;
         ICryptoTransform cryptoTransform;
         byte[] array2;
         return null;
      }
      static void Main(string[] args) {
         var HarmonyInst = new Harmony("Just a Test");
         var original = AccessTools.Method(typeof(Program), "Decry");
         var standin1 = AccessTools.Method(typeof(Program), "StandInMethod1");
         var standin2 = AccessTools.Method(typeof(Program), "StandInMethod2");
         new ReversePatcher(HarmonyInst, original, standin2).Patch();
         new ReversePatcher(HarmonyInst, original, standin1).Patch();
      }
   }
}