using System;

public class Program

{

    byte GetBit(byte data, int bitNumber)

    {

        byte result = 0xFF;

​

        if (bitNumber <= 7)

            result = (byte)((data >> bitNumber) & 1);

​

        return result;

    }

​

    UInt32 CPCNG_GenSeedKeyLevel(UInt32 seedRequest, int level)

    {

        int[] shifttable = null;

        UInt32[] hashtable = null;

​

        if (level == 0x0B)

        {

            shifttable = new int[12]

            {

                0, 3, 1, 3, 2, 1, 3, 1, 7, 5, 2, 0

            };

            hashtable = new UInt32[8] {

                0xE3288EC6, 0x2E789639, 0xE6158894, 0x01506AF7, 0x89E648EA, 0xA84371AA, 0xF19D2734, 0x493DA574

            };

        }

        else if (level == 0x11)

        {

            shifttable = new int[12]

            {

                3, 1, 0, 2, 1, 2, 4, 2, 6, 7, 1, 5

            };

            hashtable = new UInt32[] {

                0xE204E889, 0x13393EA3, 0xEA851438, 0xF3513BEF, 0xA37A2732, 0xAEBAE767, 0x1488EFF5, 0x2964C776

            };

        }

        else

            return 0;

​

        byte[] seed = new byte[] { (byte)(seedRequest >> 24), (byte)(seedRequest >> 16), (byte)(seedRequest >> 8), (byte)seedRequest };

​

        byte n = (byte)(seed[3 - shifttable[1]] ^ seed[3 - shifttable[0]]);

​

        int a = GetBit(seed[3 - shifttable[2]], shifttable[6]);

        int b = GetBit(seed[3 - shifttable[3]], shifttable[7]);

        int c = GetBit(n, shifttable[8]);

​

        int index = (a << 2) | (b << 1) | c;

​

        UInt32 x = hashtable[index] ^ seedRequest;

​

        a = GetBit(seed[3 - shifttable[4]], shifttable[9]);

        b = GetBit(n, shifttable[10]);

        c = GetBit((byte)(x >> (8 * shifttable[5])), shifttable[11]);

​

        index = (a << 2) | (b << 1) | c;

​

        UInt32 y = (hashtable[index] >> 8) | (hashtable[index] << 24);

​

        UInt32 key = x ^ y;

​

        return key;

    }

    void GenSeedKey(string sSeed)

    {

        UInt32 seed = UInt32.Parse(sSeed, System.Globalization.NumberStyles.HexNumber);

        Console.WriteLine(String.Format("SEED   : {0:X8}", seed) + Environment.NewLine);

        Console.WriteLine(String.Format("LEVEL11: {0:X8}", CPCNG_GenSeedKeyLevel(seed, 11)) + Environment.NewLine);

        Console.WriteLine(String.Format("LEVEL17: {0:X8}", CPCNG_GenSeedKeyLevel(seed, 17)) + Environment.NewLine);

    }

    public void Main()

    {

        GenSeedKey("01020304"); // INSERT HERE YOUR SEED

    }

}