C# websocket Server 加密 76號協議

服務器端源碼：

76號協議增長了加密字段

sec-websocket-key1

sec-websocket-key2

以及最後8個字節

服務器必須在握手信息以後發送回解密信息才能握手成功。

解密方式

key1 是 sec-websocket-key1 後面全部字節

key2 是 sec-websocket-key2 後面全部字節

 

part1 爲 key1內除去全部的非數字字符後獲得的數字 long型 / key1內空字符長度 int型

part2 爲 key2內除去全部的非數字字符後獲得的數字 long型 / key1內空字符長度 int型

 

part1 轉換爲byte[] byte1 (例：byte1 = {1,2,3,4})

part2 轉換爲byte[] byte2 

 

byte一、byte2內值倒轉(例：byte1 = {4,3,2,1})

byte3 是 客戶端發送過來的最後8個字節 

 

byte一、byte二、byte3 拼裝爲16個字節 byteKey[16]

byteKey[] 進行 MD5 加密 得 byteMD5[]

 

byteMD5[] 放置在握手協議最後端發送回去

C#  cs：

 

using System;using System.Collections.Generic;using System.Text;using System.Net;using System.Net.Sockets;using System.Security.Cryptography;using System.Web.Security;using System.IO;namespace Room{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("服務器啓動中...");            IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("192.168.1.80"), 2000);            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            socket.Bind(ipe);            socket.Listen(60);            Console.WriteLine("服務器啓動完畢...");            bool isfirst = true;            bool run = true;            try            {                Socket a = socket.Accept();                while (run)                {                    byte[] bytes = new byte[1024];                    int bytelength = a.Receive(bytes);                    Console.WriteLine("接收完畢。");                    #region websocket握手                    if (isfirst)                    {                        string recStr = Encoding.UTF8.GetString(bytes, 0, bytelength);                        string[] ss = recStr.Split(Environment.NewLine.ToCharArray());                        string k1 = ss[10].Substring(20);                        string k2 = ss[12].Substring(20);                        byte[] last = new byte[8];                        for (int i = 0; i < 8; i++)                        {                            last[i] = bytes[bytelength - 8 + i];                        }                        uint key1 = (uint)(long.Parse(FilterNonNumber(k1)) / FilterNonEmpty(k1).Length);                        uint key2 = (uint)(long.Parse(FilterNonNumber(k2)) / FilterNonEmpty(k2).Length);                        byte[] byteTemp1 = BitConverter.GetBytes(key1);                        byte[] byteKey1 = new byte[4];                        byte[] byteTemp2 = BitConverter.GetBytes(key2);                        byte[] byteKey2 = new byte[4];                        for (int i = 0; i < 4; i++)                        {                            byteKey1[i] = byteTemp1[3 - i];                            byteKey2[i] = byteTemp2[3 - i];                        }                        MemoryStream ms = new MemoryStream();                        ms.Write(byteKey1, 0, 4);                        ms.Write(byteKey2, 0, 4);                        ms.Write(last, 0, 8);                        ms.Flush();                        byte[] byteMs = ms.ToArray();                        ms.Dispose();                        MD5 md5 = MD5.Create();                        byte[] md = md5.ComputeHash(byteMs);                        MemoryStream ms1 = new MemoryStream();                        string sendStr = "HTTP/1.1 101 WebSocket Protocol Handshake/r/nUpgrade: WebSocket/r/nConnection: Upgrade/r/nSec-WebSocket-Origin: null/r/nSec-WebSocket-Location: ws://192.168.1.80:2000//r/n/r/n";                        byte[] temp = Encoding.UTF8.GetBytes(sendStr);                        ms1.Write(temp, 0, temp.Length);                        ms1.Write(md, 0, md.Length);                        ms1.Flush();                        byte[] byteSend = ms1.ToArray();                        ms1.Dispose();                        a.Send(byteSend, byteSend.Length, 0);                        Console.WriteLine("發送完畢。");                        isfirst = false;                    }                    #endregion                    else                    {                        if (bytelength > 2)                        {                            string recStr = Encoding.UTF8.GetString(bytes, 1, bytelength - 2);                            MemoryStream ms2 = new MemoryStream();                            string strSend = "發送回去的是中文。";                            byte[] byteSend = Encoding.UTF8.GetBytes(strSend);                            ms2.WriteByte(0);                            ms2.Write(byteSend, 0, byteSend.Length);                            ms2.WriteByte(255);                            ms2.Flush();                            a.Send(ms2.ToArray());                            ms2.Dispose();                            if (recStr.Equals("exit"))                            {                                run = false;                                Console.WriteLine("用戶已退出。");                            }                            else                            {                                Console.WriteLine("接收到：" + recStr);                            }                        }                        else                        {                            run = false;                            Console.WriteLine("用戶已退出。");                        }                    }                }                Console.ReadLine();                a.Close();                socket.Close();            }            catch (Exception e)            {                Console.WriteLine(e.Message);            }            finally            {                socket.Close();            }        }        public static string FilterNonNumber(string str)        {            if (str == null)            {                return "";            }            char[] c = str.ToCharArray();            StringBuilder sb = new StringBuilder();            for (int i = 0, len = c.Length; i < len; i++)            {                if (char.IsNumber(c[i]))                {                    sb.Append(c[i]);                }            }            return sb.ToString();        }        public static string FilterNonEmpty(string str)        {            if (str == null)            {                return " ";            }            char[] c = str.ToCharArray();            StringBuilder sb = new StringBuilder();            for (int i = 0, len = c.Length; i < len; i++)            {                if (c[i] == ' ')                {                    sb.Append(c[i]);                }            }            if (sb.ToString().Length == 0)            {                return " ";            }            else            {                return sb.ToString();            }        }    }}