直播app开发搭建，将聊天数据发送加密

public partial class Form1 : Form<br>{<br>    public Form1()<br>    {<br>        InitializeComponent();<br>    }<br>    #region 定义全局对象及变量<br>    private IPEndPoint Server;//服务器端<br>    private IPEndPoint Client;//客户端<br>    private Socket mySocket;//套接字<br>    private EndPoint ClientIP;//IP地址<br>    byte[] buffer, data;//接收缓存<br>    bool blFlag = true;//标识是否第一次发送信息<br>    bool ISPort = false;//判断端口打开<br>    int SendNum1, ReceiveNum1, DisNum1; //记录窗体加载时的已发送\已接收\丢失的数据报<br>    int SendNum2, ReceiveNum2, DisNum2; //记录当前已发送\已接收\丢失的数据报<br>    int SendNum3, ReceiveNum3, DisNum3; //缓存已发送\已接收\丢失的数据报<br>    int port;//端口号<br>    #endregion<br>    //异步接收信息<br>    private void StartLister(IAsyncResult IAResult)<br>    {<br>        int Num = mySocket.EndReceiveFrom(IAResult, ref ClientIP);<br>        string strInfo = Encoding.Unicode.GetString(buffer, 0, Num);<br>        rtbContent.AppendText("用户" + ClientIP.ToString());<br>        rtbContent.AppendText("：");<br>        rtbContent.AppendText("\r\n");<br>        rtbContent.AppendText(DecryptDES(strInfo, "mrsoftxk"));//对接收到的信息进行解密<br>        rtbContent.AppendText("\r\n");<br>        mySocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref ClientIP, new AsyncCallback(StartLister), null);<br>    }<br>    //初始化已发送、已接收和丢失的数据报<br>    private void Form1_Load(object sender, EventArgs e)<br>    {<br>        if (blFlag == true)<br>        {<br>            IPGlobalProperties NetInfo = IPGlobalProperties.GetIPGlobalProperties();<br>            UdpStatistics myUdpStat = null;<br>            myUdpStat = NetInfo.GetUdpIPv4Statistics();<br>            SendNum1 = Int32.Parse(myUdpStat.DatagramsSent.ToString());<br>            ReceiveNum1 = Int32.Parse(myUdpStat.DatagramsReceived.ToString());<br>            DisNum1 = Int32.Parse(myUdpStat.IncomingDatagramsDiscarded.ToString());<br>        }<br>    }<br>    //设置端口号<br>    private void button4_Click(object sender, EventArgs e)<br>    {<br>        try<br>        {<br>            port = Convert.ToInt32(textBox4.Text);<br>            CheckForIllegalCrossThreadCalls = false;<br>            buffer = new byte[1024];<br>            data = new byte[1024];<br>            Server = new IPEndPoint(IPAddress.Any, port);<br>            Client = new IPEndPoint(IPAddress.Broadcast, port);<br>            ClientIP = (EndPoint)Server;<br>            mySocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);<br>            mySocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);<br>            mySocket.Bind(Server);<br>            mySocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref ClientIP, new AsyncCallback(StartLister), null);<br>            ISPort = true;//打开指定端口号<br>        }<br>        catch { }<br>    }<br>    //发送信息<br>    private void button2_Click(object sender, EventArgs e)<br>    {<br>        if (ISPort == true)//判断是否有打开的端口号<br>        {<br>            IPGlobalProperties NetInfo = IPGlobalProperties.GetIPGlobalProperties();<br>            UdpStatistics myUdpStat = null;<br>            myUdpStat = NetInfo.GetUdpIPv4Statistics();<br>            try<br>            {<br>                if (blFlag == false)//非第一次发送<br>                {<br>                    SendNum2 = Int32.Parse(myUdpStat.DatagramsSent.ToString());<br>                    ReceiveNum2 = Int32.Parse(myUdpStat.DatagramsReceived.ToString());<br>                    DisNum2 = Int32.Parse(myUdpStat.IncomingDatagramsDiscarded.ToString());<br>                    textBox1.Text = Convert.ToString(SendNum2 - SendNum3);<br>                    textBox2.Text = Convert.ToString(ReceiveNum2 - ReceiveNum3);<br>                    textBox3.Text = Convert.ToString(DisNum2 - DisNum3);<br>                }<br>                SendNum2 = Int32.Parse(myUdpStat.DatagramsSent.ToString());<br>                ReceiveNum2 = Int32.Parse(myUdpStat.DatagramsReceived.ToString());<br>                DisNum2 = Int32.Parse(myUdpStat.IncomingDatagramsDiscarded.ToString());<br>                SendNum3 = SendNum2; //记录本次的发送数据报<br>                ReceiveNum3 = ReceiveNum2;//记录本次的接收数据报<br>                DisNum3 = DisNum2; //记录本次的丢失数据报<br>                if (blFlag == true)//第一次发送<br>                {<br>                    textBox1.Text = Convert.ToString(SendNum2 - SendNum1);<br>                    textBox2.Text = Convert.ToString(ReceiveNum2 - ReceiveNum1);<br>                    textBox3.Text = Convert.ToString(DisNum2 - DisNum1);<br>                    blFlag = false;<br>                }<br>            }<br>            catch (Exception ex)<br>            {<br>                MessageBox.Show(ex.Message, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);<br>            }<br>            string str = EncryptDES(rtbSend.Text, "mrsoftxk");//加密要发送的信息<br>            data = Encoding.Unicode.GetBytes(str);<br>            mySocket.SendTo(data, data.Length, SocketFlags.None, Client);<br>            rtbSend.Text = "";<br>        }<br>        else<br>        {<br>            MessageBox.Show("请首先打开端口！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);<br>            button4.Focus();<br>        }<br>    }<br>    //清屏<br>    private void button1_Click(object sender, EventArgs e)<br>    {<br>        rtbContent.Clear();<br>    }<br>    //退出<br>    private void button3_Click(object sender, EventArgs e)<br>    {<br>        Application.Exit();<br>    }<br>    //按<Ctrl+Enter>组合键发送信息<br>    private void rtbSend_KeyDown(object sender, KeyEventArgs e)<br>    {<br>        //当同时按下Ctrl和Enter时，发送消息<br>        if (e.Control && e.KeyValue == 13)<br>        {<br>            e.Handled = true;<br>            button2_Click(this, null);<br>        }<br>    }<br>    //聊天记录随时滚动<br>    private void rtbContent_TextChanged(object sender, EventArgs e)<br>    {<br>        rtbContent.ScrollToCaret();<br>    }<br>    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//密钥<br>    #region DES加密字符串<br>    ///<summary>   <br>    ///DES加密字符串   <br>    ///</summary>   <br>    ///<param name="str">待加密的字符串</param>   <br>    ///<param name="key">加密密钥,要求为8位</param>   <br>    ///<returns>加密成功返回加密后的字符串，失败返回源字符串</returns>   <br>    public string EncryptDES(string str, string key)<br>    {<br>        try<br>        {<br>            byte[] rgbKey = Encoding.UTF8.GetBytes(key.Substring(0, 8));<br>            byte[] rgbIV = Keys;<br>            byte[] inputByteArray = Encoding.UTF8.GetBytes(str);<br>            DESCryptoServiceProvider myDES = new DESCryptoServiceProvider();<br>            MemoryStream MStream = new MemoryStream();<br>            CryptoStream CStream = new CryptoStream(MStream, myDES.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);<br>            CStream.Write(inputByteArray, 0, inputByteArray.Length);<br>            CStream.FlushFinalBlock();<br>            return Convert.ToBase64String(MStream.ToArray());<br>        }<br>        catch<br>        {<br>            return str;<br>        }<br>    }<br>    #endregion<br>    #region DES解密字符串<br>    ///<summary>   <br>    ///DES解密字符串   <br>    ///</summary>   <br>    ///<param name="str">待解密的字符串</param>   <br>    ///<param name="key">解密密钥,要求为8位,和加密密钥相同</param>   <br>    ///<returns>解密成功返回解密后的字符串，失败返源字符串</returns>   <br>    public string DecryptDES(string str, string key)<br>    {<br>        try<br>        {<br>            byte[] rgbKey = Encoding.UTF8.GetBytes(key);<br>            byte[] rgbIV = Keys;<br>            byte[] inputByteArray = Convert.FromBase64String(str);<br>            DESCryptoServiceProvider myDES = new DESCryptoServiceProvider();<br>            MemoryStream MStream = new MemoryStream();<br>            CryptoStream CStream = new CryptoStream(MStream, myDES.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);<br>            CStream.Write(inputByteArray, 0, inputByteArray.Length);<br>            CStream.FlushFinalBlock();<br>            return Encoding.UTF8.GetString(MStream.ToArray());<br>        }<br>        catch<br>        {<br>            return str;<br>        }<br>    }<br>    #endregion<br>}