using SHNDecrypt;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace EncryptionChange
{
    class Program
    {
        static void Main(string[] args)
        {
            SHNFile SHN = new SHNFile();

            Byte[] test = SHN.test11(String.Format("{0}/ItemInfo.shn", Environment.CurrentDirectory));

            for (int i = 0; i < 255; i++)
            {
                for (int i1 = 0; i1 < 255; i1++)
                {
                    for (int i2 = 0; i2 < 255; i2++)
                    {
                        for (int i3 = 0; i3 < 255; i3++)
                        {
                            byte[] test1 = (Byte[])test.Clone();
                            Decrypt(test1, 0, test1.Length, i, i1, i2, i3);

                            if (Encoding.UTF8.GetString(test1, 3492, 12) != "LeatherBoots") { Console.WriteLine(i + " " + i1 + " " + i2 + " " + i3 + " - Nope"); }
                            else
                            {
                                StreamWriter Writer = new StreamWriter(String.Format("{0}/Yes.txt", Environment.CurrentDirectory));
                                Writer.WriteLine(i + " " + i1 + " " + i2 + " " + i3);
                                Writer.Close();
                                Console.WriteLine("Yep");
                            }
                        }
                    }
                }
            }

            Console.ReadLine();
        }

        private static void Decrypt(byte[] data, int index, int length)
        {
            if (((index < 0) | (length < 1)) | ((index + length) > data.Length))
            {
                throw new IndexOutOfRangeException();
            }
            byte num = (byte)length;
            for (int i = length - 1; i >= 0; i--)
            {
                data[i] = (byte)(data[i] ^ num);
                byte num3 = (byte)i;
                num3 = (byte)(num3 & 15);
                num3 = (byte)(num3 + 0x55);
                num3 = (byte)(num3 ^ ((byte)(((byte)i) * 11)));
                num3 = (byte)(num3 ^ num);
                num3 = (byte)(num3 ^ 170);
                num = num3;
            }
        }

        private static void Decrypt(byte[] data, int index, int length, Int32 Value1, Int32 Value2, Int32 Value3, Int32 Value4)
        {
            if (((index < 0) | (length < 1)) | ((index + length) > data.Length))
            {
                throw new IndexOutOfRangeException();
            }
            byte num = (byte)length;
            for (int i = length - 1; i >= 0; i--)
            {
                data[i] = (byte)(data[i] ^ num);
                byte num3 = (byte)i;
                num3 = (byte)(num3 & Value1);
                num3 = (byte)(num3 + Value2);
                num3 = (byte)(num3 ^ ((byte)(((byte)i) * Value3)));
                num3 = (byte)(num3 ^ num);
                num3 = (byte)(num3 ^ Value4);
                num = num3;
            }
        }
    }
}