C# websocket Server 加密 76号协议

服务器端源码：

76号协议增加了加密字段

sec-websocket-key1

sec-websocket-key2

以及最后8个字节

服务器必须在握手信息之后发送回解密信息才能握手成功。

解密方式

key1 是 sec-websocket-key1 后面所有字节

key2 是 sec-websocket-key2 后面所有字节

part1 为 key1内除去所有的非数字字符后得到的数字 long型 / key1内空字符长度 int型

part2 为 key2内除去所有的非数字字符后得到的数字 long型 / key1内空字符长度 int型

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

part2 转换为byte[] byte2

byte1、byte2内值倒转(例：byte1 = {4,3,2,1})

byte3 是 客户端发送过来的最后8个字节

byte1、byte2、byte3 拼装为16个字节 byteKey[16]

byteKey[] 进行 MD5 加密 得 byteMD5[]

byteMD5[] 放置在握手协议最后端发送回去

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("服务器启动中...");
            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("服务器启动完毕...");
            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("接收完毕。");
                    #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("发送完毕。");
                        isfirst = false;
                    }
                    #endregion
                    else
                    {
                        if (bytelength > 2)
                        {
                            string recStr = Encoding.UTF8.GetString(bytes, 1, bytelength - 2);
                            MemoryStream ms2 = new MemoryStream();
                            string strSend = "发送回去的是中文。";
                            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("用户已退出。");
                            }
                            else
                            {
                                Console.WriteLine("接收到：" + recStr);
                            }
                        }
                        else
                        {
                            run = false;
                            Console.WriteLine("用户已退出。");
                        }
                    }
                }
                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();
            }
        }
    }
}