Csharp/C#教程：C#实现数据包加密与解密实例详解分享

在很多项目中，为了安全安全考虑，需要对数据包进行加密处理，本文实例所述的即为C#加密代码，在应用开发中有很大的实用价值。说起数据包加密，其实对C#编程者来说，应该是一个基础的技巧，是进行C#程序设计人员必须要掌握的技能。

C#实现加密功能的核心代码如下：

usingSystem; usingSystem.Collections.Generic; usingSystem.ComponentModel; usingSystem.Data; usingSystem.Drawing; usingSystem.Linq; usingSystem.Text; usingSystem.Windows.Forms; usingSystem.Threading; usingSystem.Net; usingSystem.Net.Sockets; usingSystem.Net.NetworkInformation; usingSystem.Security.Cryptography; usingSystem.IO; namespaceEncryptDataReport { publicpartialclassForm1:Form { publicForm1() { InitializeComponent(); } #region定义全局对象及变量 privateIPEndPointServer;//服务器端 privateIPEndPointClient;//客户端 privateSocketmySocket;//套接字 privateEndPointClientIP;//IP地址 byte[]buffer,data;//接收缓存 boolblFlag=true;//标识是否第一次发送信息 boolISPort=false;//判断端口打开 intSendNum1,ReceiveNum1,DisNum1;//记录窗体加载时的已发送已接收丢失的数据报 intSendNum2,ReceiveNum2,DisNum2;//记录当前已发送已接收丢失的数据报 intSendNum3,ReceiveNum3,DisNum3;//缓存已发送已接收丢失的数据报 intport;//端口号 #endregion //异步接收信息 privatevoidStartLister(IAsyncResultIAResult) { intNum=mySocket.EndReceiveFrom(IAResult,refClientIP); stringstrInfo=Encoding.Unicode.GetString(buffer,0,Num); rtbContent.AppendText("用户"+ClientIP.ToString()); rtbContent.AppendText("："); rtbContent.AppendText("rn"); rtbContent.AppendText(DecryptDES(strInfo,"mrsoftxk"));//对接收到的信息进行解密 rtbContent.AppendText("rn"); mySocket.BeginReceiveFrom(buffer,0,buffer.Length,SocketFlags.None,refClientIP,newAsyncCallback(StartLister),null); } //初始化已发送、已接收和丢失的数据报 privatevoidForm1_Load(objectsender,EventArgse) { if(blFlag==true) { IPGlobalPropertiesNetInfo=IPGlobalProperties.GetIPGlobalProperties(); UdpStatisticsmyUdpStat=null; myUdpStat=NetInfo.GetUdpIPv4Statistics(); SendNum1=Int32.Parse(myUdpStat.DatagramsSent.ToString()); ReceiveNum1=Int32.Parse(myUdpStat.DatagramsReceived.ToString()); DisNum1=Int32.Parse(myUdpStat.IncomingDatagramsDiscarded.ToString()); } } //设置端口号 privatevoidbutton4_Click(objectsender,EventArgse) { try { port=Convert.ToInt32(textBox4.Text); CheckForIllegalCrossThreadCalls=false; buffer=newbyte[1024]; data=newbyte[1024]; Server=newIPEndPoint(IPAddress.Any,port); Client=newIPEndPoint(IPAddress.Broadcast,port); ClientIP=(EndPoint)Server; mySocket=newSocket(AddressFamily.InterNetwork,SocketType.Dgram,ProtocolType.Udp); mySocket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.Broadcast,1); mySocket.Bind(Server); mySocket.BeginReceiveFrom(buffer,0,buffer.Length,SocketFlags.None,refClientIP,newAsyncCallback(StartLister),null); ISPort=true;//打开指定端口号 } catch{} } //发送信息 privatevoidbutton2_Click(objectsender,EventArgse) { if(ISPort==true)//判断是否有打开的端口号 { IPGlobalPropertiesNetInfo=IPGlobalProperties.GetIPGlobalProperties(); UdpStatisticsmyUdpStat=null; myUdpStat=NetInfo.GetUdpIPv4Statistics(); try { if(blFlag==false)//非第一次发送 { SendNum2=Int32.Parse(myUdpStat.DatagramsSent.ToString()); ReceiveNum2=Int32.Parse(myUdpStat.DatagramsReceived.ToString()); DisNum2=Int32.Parse(myUdpStat.IncomingDatagramsDiscarded.ToString()); textBox1.Text=Convert.ToString(SendNum2-SendNum3); textBox2.Text=Convert.ToString(ReceiveNum2-ReceiveNum3); textBox3.Text=Convert.ToString(DisNum2-DisNum3); } SendNum2=Int32.Parse(myUdpStat.DatagramsSent.ToString()); ReceiveNum2=Int32.Parse(myUdpStat.DatagramsReceived.ToString()); DisNum2=Int32.Parse(myUdpStat.IncomingDatagramsDiscarded.ToString()); SendNum3=SendNum2;//记录本次的发送数据报 ReceiveNum3=ReceiveNum2;//记录本次的接收数据报 DisNum3=DisNum2;//记录本次的丢失数据报 if(blFlag==true)//第一次发送 { textBox1.Text=Convert.ToString(SendNum2-SendNum1); textBox2.Text=Convert.ToString(ReceiveNum2-ReceiveNum1); textBox3.Text=Convert.ToString(DisNum2-DisNum1); blFlag=false; } } catch(Exceptionex) { MessageBox.Show(ex.Message,"提示信息",MessageBoxButtons.OK,MessageBoxIcon.Information); } stringstr=EncryptDES(rtbSend.Text,"mrsoftxk");//加密要发送的信息 data=Encoding.Unicode.GetBytes(str); mySocket.SendTo(data,data.Length,SocketFlags.None,Client); rtbSend.Text=""; } else { MessageBox.Show("请首先打开端口！","提示",MessageBoxButtons.OK,MessageBoxIcon.Information); button4.Focus(); } } //清屏 privatevoidbutton1_Click(objectsender,EventArgse) { rtbContent.Clear(); } //退出 privatevoidbutton3_Click(objectsender,EventArgse) { Application.Exit(); } //按<Ctrl+Enter>组合键发送信息 privatevoidrtbSend_KeyDown(objectsender,KeyEventArgse) { //当同时按下Ctrl和Enter时，发送消息 if(e.Control&&e.KeyValue==13) { e.Handled=true; button2_Click(this,null); } } //聊天记录随时滚动 privatevoidrtbContent_TextChanged(objectsender,EventArgse) { rtbContent.ScrollToCaret(); } privatestaticbyte[]Keys={0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF};//密钥 #regionDES加密字符串 ///<summary> ///DES加密字符串 ///</summary> ///<paramname="str">待加密的字符串</param> ///<paramname="key">加密密钥,要求为8位</param> ///<returns>加密成功返回加密后的字符串，失败返回源字符串</returns> publicstringEncryptDES(stringstr,stringkey) { try { byte[]rgbKey=Encoding.UTF8.GetBytes(key.Substring(0,8)); byte[]rgbIV=Keys; byte[]inputByteArray=Encoding.UTF8.GetBytes(str); DESCryptoServiceProvidermyDES=newDESCryptoServiceProvider(); MemoryStreamMStream=newMemoryStream(); CryptoStreamCStream=newCryptoStream(MStream,myDES.CreateEncryptor(rgbKey,rgbIV),CryptoStreamMode.Write); CStream.Write(inputByteArray,0,inputByteArray.Length); CStream.FlushFinalBlock(); returnConvert.ToBase64String(MStream.ToArray()); } catch { returnstr; } } #endregion #regionDES解密字符串 ///<summary> ///DES解密字符串 ///</summary> ///<paramname="str">待解密的字符串</param> ///<paramname="key">解密密钥,要求为8位,和加密密钥相同</param> ///<returns>解密成功返回解密后的字符串，失败返源字符串</returns> publicstringDecryptDES(stringstr,stringkey) { try { byte[]rgbKey=Encoding.UTF8.GetBytes(key); byte[]rgbIV=Keys; byte[]inputByteArray=Convert.FromBase64String(str); DESCryptoServiceProvidermyDES=newDESCryptoServiceProvider(); MemoryStreamMStream=newMemoryStream(); CryptoStreamCStream=newCryptoStream(MStream,myDES.CreateDecryptor(rgbKey,rgbIV),CryptoStreamMode.Write); CStream.Write(inputByteArray,0,inputByteArray.Length); CStream.FlushFinalBlock(); returnEncoding.UTF8.GetString(MStream.ToArray()); } catch { returnstr; } } #endregion } }

本例备有详细的注释，对于开发者而言应该不难理解，读者可以根据自身项目需要改进本例代码以符合自身应用需求。

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