namespace HabboRC4_V24Release
{
    using System;
    using System.Text;

    public class Habbo_V24_Crypto
    {
        private string[] di = new string[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" };
        private int i;
        private int j;
        private int[] key = new int[0x100];
        private int premixCount = 0x11;
        private string premixString = "1wz8rzgiv87708l9oi7ot8l9smdqv5yvzz8tavkyuoi9p3kgrrq7r5p53kchnb5hly8jkfx5hsoo6imx8o5ktczwdst8dooa7r331wkrw8zi8789io89mq5vztvyo93gr755khbhyjf5soixokcws8oar3wr";
        private int[] table = new int[0x100];

        public Habbo_V24_Crypto()
        {
            this.initCalculators();
            this.init();
            this.premixTable(this.premixString, this.premixCount);
        }

        public string deciphper(string data)
        {
            StringBuilder builder = new StringBuilder(data.Length);
            int num = 0;
            int num2 = 0;
            for (int i = 0; i < data.Length; i += 2)
            {
                this.i = (this.i + 1) % 0x100;
                this.j = (this.j + this.table[this.i]) % 0x100;
                num = this.table[this.i];
                this.table[this.i] = this.table[this.j];
                this.table[this.j] = num;
                num2 = this.table[(this.table[this.i] + this.table[this.j]) % 0x100];
                num = Convert.ToInt32(this.JavaSubstring(data, i, i + 2), 0x10);
                builder = builder.Append((char) (num ^ num2));
            }
            return builder.ToString();
        }

        public string encipher(string data)
        {
            StringBuilder builder = new StringBuilder(data.Length * 2);
            int num = 0;
            int num2 = 0;
            for (int i = 0; i < data.Length; i++)
            {
                this.i = (this.i + 1) % 0x100;
                this.j = (this.j + this.table[this.i]) % 0x100;
                num = this.table[this.i];
                this.table[this.i] = this.table[this.j];
                this.table[this.j] = num;
                num2 = this.table[(this.table[this.i] + this.table[this.j]) % 0x100];
                int num4 = data.Substring(i, 1).ToCharArray()[0] ^ num2;
                if (num4 <= 0)
                {
                    builder.Append("00");
                }
                else
                {
                    builder.Append(this.di[(num4 >> 4) & 15]);
                    builder.Append(this.di[num4 & 15]);
                }
            }
            return builder.ToString();
        }

        private static string GenerateRandomString(int Length)
        {
            string str = "";
            Random random = new Random();
            for (int i = 0; i < Length; i++)
            {
                str = str + ((char) random.Next(0x41, 0x7a)).ToString();
            }
            return str;
        }

        private void init()
        {
            for (int i = 0; i <= 0xfe; i++)
            {
                this.table[i] = i + 1;
            }
            this.table[0] = 0;
            this.table[0xff] = 1;
        }

        private void initCalculators()
        {
            this.i = 0;
            this.j = 0;
        }

        public string JavaSubstring(string dataIn, int start, int end)
        {
            return dataIn.Substring(start, end - start);
        }

        internal void premixTable(string datain, int count)
        {
            for (int i = 0; i < count; i++)
            {
                this.encipher(datain);
            }
        }

        public string rePremix()
        {
            int count = 10;
            string datain = GenerateRandomString(20);
            this.premixTable(datain, count);
            return "";
        }
    }
}