tl.cs

using System;
using System.Net;
using System.IO;
using System.Collections.Generic;
using System.Numerics;
using System.Net.Sockets;

namespace qwerty
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            var telegram = new Telegram();
            telegram.Run();
        }
    }

    class Telegram
    {
        //private BigInteger m = new BigInteger(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
        private BigInteger e = new BigInteger(0x010001);
        private NetworkStream stream;
        private uint package_number = 0;
        private uint req_pq = 0x60469778;

        public void Run()
        {
            //byte.Parse ();
            Console.WriteLine("Hello World!");
            TcpClient client = new TcpClient("173.240.5.253", 80);

            stream = client.GetStream();

            byte[] nonce = Gnonce(16);

            Write(FirstData(nonce));

            //stream.Write(data, 0, data.Length);

            byte[] data = Read();

            Console.WriteLine("end");
        }

        public byte[] Gnonce(int size)
        {
            byte[] res = new byte[size];

            var random = new Random();

            res[0] = (byte)random.Next(byte.MaxValue);

            for (var i = 1; i < size; i++)
            {
                res[i] = (byte)random.Next();
            }

            return res;
        }

        private byte[] FirstData(byte[] nonce)
        {
            List<byte> bytes = new List<byte>(40);
            bytes.AddRange(BitConverter.GetBytes((ulong)0));
            bytes.AddRange(BitConverter.GetBytes(GetTimeStamp()));
            bytes.AddRange(BitConverter.GetBytes((uint)20));
            bytes.AddRange(BitConverter.GetBytes(req_pq));
            bytes.AddRange(nonce);           

            return bytes.ToArray();
        }

        private ulong GetTimeStamp()
        {
            int unixTime = (int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds;
            return (ulong)unixTime;
        }

        private byte[] Read()
        {
            byte[] buf = new byte[1024];           

            Int32 bytes = stream.Read(buf, 0, buf.Length);            
            Console.WriteLine("readed " + bytes + " byte(s)");            

            return buf;
        }        

        private byte[] ReadBytes(byte[] buf, int startIndex, int endIndex)
        {
            byte[] res = new byte[endIndex];

            var j = 0;
            for (var i = startIndex; i < endIndex; i++)
            {
                res[j] = buf[i];
                j++;
            }

            return res;
        }

        public void Write(byte[] data)
        {            
            byte[] res = Wrap(data, package_number++);            
            stream.Write(res, 0, res.Length);

            Console.WriteLine("sended " + res.Length + " byte(s)");
            Console.WriteLine();
        }
        
        private byte[] Wrap(byte[] bytes, uint number)
        {
            var buf = new Buffer(bytes.Length + 4 * 3);
            buf.Write((uint)bytes.Length + 4 * 3);
            buf.Write(number);
            buf.Write(bytes);

            buf.Write(CRC32.Hash(buf.ToArray()));
            
            return buf.ToArray();
        }
    }

    public static class CRC32
    {
        private static readonly UInt32[] CRCTable = {
            0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
            0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
            0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
            0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
            0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
            0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
            0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
            0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
            0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
            0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
            0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
            0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
            0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
            0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
            0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
            0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
            0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
            0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
            0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
            0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
            0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
            0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
            0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
            0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
            0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
            0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
            0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
            0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
            0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
            0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
            0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
            0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
            0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
            0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
            0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
            0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
            0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
            0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
            0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
            0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
            0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
            0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
            0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
            0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
            0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
            0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
            0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
            0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
            0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
            0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
            0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
            0x2d02ef8d
        };

        public static byte[] Hash(byte[] value)
        {
            UInt32 CRCVal = 0xffffffff;
            for (int i = 0; i < value.Length; i++)
            {
                CRCVal = (CRCVal >> 8) ^ CRCTable[(CRCVal & 0xff) ^ value[i]];
            }

            CRCVal ^= 0xffffffff; // Toggle operation
            byte[] result = new byte[4];

            result[0] = (byte)(CRCVal >> 24);
            result[1] = (byte)(CRCVal >> 16);
            result[2] = (byte)(CRCVal >> 8);
            result[3] = (byte)(CRCVal);

            return result;
        }
  
    }

    public class Buffer
    {
        private List<byte> res;

        public Buffer(int capacity)
        {
            this.res = new List<byte>(capacity);            
        }

        public void Write(bool value)
        {
            res.AddRange(BitConverter.GetBytes(value));     
        }

        public void Write(char value)
        {
            res.AddRange(BitConverter.GetBytes(value));
        }

        public void Write(uint value)
        {
            res.AddRange(BitConverter.GetBytes(value));            
        }

        public void Write(byte[] bytes)
        {
            res.AddRange(bytes);
        }

        public byte[] ToArray()
        {
            return this.res.ToArray();
        }
    }

    public static class ByteExtensions
    {
        public static string ToHex(this byte[] bytes)
        {
            char[] c = new char[bytes.Length * 2];

            byte b;

            for (int bx = 0, cx = 0; bx < bytes.Length; ++bx, ++cx)
            {
                b = ((byte)(bytes[bx] >> 4));
                c[cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);

                b = ((byte)(bytes[bx] & 0x0F));
                c[++cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);
            }

            return new string(c);
        }

        public static byte[] Read(int startIndex, int endIndex)
        {
            var res = new List<byte>();



            return res.ToArray();
        }
    }
}