这篇文章主要为大家详细介绍了如何利用C#实现将聊天数据发送加密的功能，文中的示例代码讲解详细，对我们学习C#有一定的帮助，感兴趣的小伙伴可以跟随小编一起了解一下!
实践过程
效果
代码
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
#region 定义全局对象及变量
private IPEndPoint Server;//服务器端
private IPEndPoint Client;//客户端
private Socket mySocket;//套接字
private EndPoint ClientIP;//IP地址
byte[] buffer, data;//接收缓存
bool blFlag = true;//标识是否第一次发送信息
bool ISPort = false;//判断端口打开
int SendNum1, ReceiveNum1, DisNum1; //记录窗体加载时的已发送\已接收\丢失的数据报
int SendNum2, ReceiveNum2, DisNum2; //记录当前已发送\已接收\丢失的数据报
int SendNum3, ReceiveNum3, DisNum3; //缓存已发送\已接收\丢失的数据报
int port;//端口号
#endregion
//异步接收信息
private void StartLister(IAsyncResult IAResult)
{
int Num = mySocket.EndReceiveFrom(IAResult, ref ClientIP);
string strInfo = Encoding.Unicode.GetString(buffer, 0, Num);
rtbContent.AppendText("用户" + ClientIP.ToString());
rtbContent.AppendText("：");
rtbContent.AppendText("\r\n");
rtbContent.AppendText(DecryptDES(strInfo, "mrsoftxk"));//对接收到的信息进行解密
rtbContent.AppendText("\r\n");
mySocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref ClientIP, new AsyncCallback(StartLister), null);
}
//初始化已发送、已接收和丢失的数据报
private void Form1_Load(object sender, EventArgs e)
{
if (blFlag == true)
{
IPGlobalProperties NetInfo = IPGlobalProperties.GetIPGlobalProperties();
UdpStatistics myUdpStat = 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
private void button4_Click(object sender, EventArgs e)
{
try
{
port = Convert.ToInt32(textBox4.Text);
CheckForIllegalCrossThreadCalls = false;
buffer = new byte[1024];
data = new byte[1024];
Server = new IPEndPoint(IPAddress.Any, port);
Client = new IPEndPoint(IPAddress.Broadcast, port);
ClientIP = (EndPoint)Server;
mySocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
mySocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
mySocket.Bind(Server);
mySocket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref ClientIP, new AsyncCallback(StartLister), null);
ISPort = true;//打开指定端口号
}
catch { }
}
//发送信息
private void button2_Click(object sender, EventArgs e)
{
if (ISPort == true)//判断是否有打开的端口号
{
IPGlobalProperties NetInfo = IPGlobalProperties.GetIPGlobalProperties();
UdpStatistics myUdpStat = 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 (Exception ex)
{
MessageBox.Show(ex.Message, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
string str = 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
private void button1_Click(object sender, EventArgs e)
{
rtbContent.Clear();
}
//退出
private void button3_Click(object sender, EventArgs e)
{
Application.Exit();
}
//按<Ctrl+Enter>组合键发送信息
private void rtbSend_KeyDown(object sender, KeyEventArgs e)
{
//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
private void rtbContent_TextChanged(object sender, EventArgs e)
{
rtbContent.ScrollToCaret();
}
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//密钥
#region DES加密字符串
///<summary>
///DES加密字符串
///</summary>
///<param name="str">待加密的字符串</param>
///<param name="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>
public string EncryptDES(string str, string key)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(key.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(str);
DESCryptoServiceProvider myDES = new DESCryptoServiceProvider();
MemoryStream MStream = new MemoryStream();
CryptoStream CStream = new CryptoStream(MStream, myDES.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
CStream.Write(inputByteArray, 0, inputByteArray.Length);
CStream.FlushFinalBlock();
return Convert.ToBase64String(MStream.ToArray());
}
catch
{
return str;
}
}
#endregion
#region DES解密字符串
///<summary>
///DES解密字符串
///</summary>
///<param name="str">待解密的字符串</param>
///<param name="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>
public string DecryptDES(string str, string key)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(key);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(str);
DESCryptoServiceProvider myDES = new DESCryptoServiceProvider();
MemoryStream MStream = new MemoryStream();
CryptoStream CStream = new CryptoStream(MStream, myDES.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
CStream.Write(inputByteArray, 0, inputByteArray.Length);
CStream.FlushFinalBlock();
return Encoding.UTF8.GetString(MStream.ToArray());
}
catch
{
return str;
}
}
#endregion
}
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.splitContainer1 = new System.Windows.Forms.SplitContainer();
this.rtbContent = new System.Windows.Forms.RichTextBox();
this.splitContainer2 = new System.Windows.Forms.SplitContainer();
this.rtbSend = new System.Windows.Forms.RichTextBox();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.textBox3 = new System.Windows.Forms.TextBox();
this.label5 = new System.Windows.Forms.Label();
this.textBox2 = new System.Windows.Forms.TextBox();
this.label4 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.label3 = new System.Windows.Forms.Label();
this.label8 = new System.Windows.Forms.Label();
this.textBox4 = new System.Windows.Forms.TextBox();
this.groupBox2 = new System.Windows.Forms.GroupBox();
this.button4 = new System.Windows.Forms.Button();
this.splitContainer1.Panel1.SuspendLayout();
this.splitContainer1.Panel2.SuspendLayout();
this.splitContainer1.SuspendLayout();
this.splitContainer2.Panel1.SuspendLayout();
this.splitContainer2.Panel2.SuspendLayout();
this.splitContainer2.SuspendLayout();
this.groupBox1.SuspendLayout();
this.groupBox2.SuspendLayout();
this.SuspendLayout();
//
// splitContainer1
//
this.splitContainer1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.splitContainer1.Location = new System.Drawing.Point(4, 4);
this.splitContainer1.Name = "splitContainer1";
this.splitContainer1.Orientation = System.Windows.Forms.Orientation.Horizontal;
//
// splitContainer1.Panel1
//
this.splitContainer1.Panel1.Controls.Add(this.rtbContent);
//
// splitContainer1.Panel2
//
this.splitContainer1.Panel2.Controls.Add(this.splitContainer2);
this.splitContainer1.Size = new System.Drawing.Size(430, 364);
this.splitContainer1.SplitterDistance = 240;
this.splitContainer1.SplitterWidth = 3;
this.splitContainer1.TabIndex = 1;
//
// rtbContent
//
this.rtbContent.BackColor = System.Drawing.Color.White;
this.rtbContent.BorderStyle = System.Windows.Forms.BorderStyle.None;
this.rtbContent.Dock = System.Windows.Forms.DockStyle.Fill;
this.rtbContent.Location = new System.Drawing.Point(0, 0);
this.rtbContent.Name = "rtbContent";
this.rtbContent.ReadOnly = true;
this.rtbContent.Size = new System.Drawing.Size(428, 238);
this.rtbContent.TabIndex = 9;
this.rtbContent.Text = "";
this.rtbContent.TextChanged += new System.EventHandler(this.rtbContent_TextChanged);
//
// splitContainer2
//
this.splitContainer2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.splitContainer2.Dock = System.Windows.Forms.DockStyle.Fill;
this.splitContainer2.Location = new System.Drawing.Point(0, 0);
this.splitContainer2.Name = "splitContainer2";
this.splitContainer2.Orientation = System.Windows.Forms.Orientation.Horizontal;
//
// splitContainer2.Panel1
//
this.splitContainer2.Panel1.Controls.Add(this.rtbSend);
//
// splitContainer2.Panel2
//
this.splitContainer2.Panel2.Controls.Add(this.button1);
this.splitContainer2.Panel2.Controls.Add(this.button2);
this.splitContainer2.Panel2.Controls.Add(this.button3);
this.splitContainer2.Size = new System.Drawing.Size(430, 121);
this.splitContainer2.SplitterDistance = 87;
this.splitContainer2.SplitterWidth = 1;
this.splitContainer2.TabIndex = 0;
//
// rtbSend
//
this.rtbSend.BorderStyle = System.Windows.Forms.BorderStyle.None;
this.rtbSend.Dock = System.Windows.Forms.DockStyle.Fill;
this.rtbSend.Location = new System.Drawing.Point(0, 0);
this.rtbSend.Name = "rtbSend";
this.rtbSend.Size = new System.Drawing.Size(428, 85);
this.rtbSend.TabIndex = 2;
this.rtbSend.Text = "";
this.rtbSend.KeyDown += new System.Windows.Forms.KeyEventHandler(this.rtbSend_KeyDown);
//
// button1
//
this.button1.Location = new System.Drawing.Point(294, 4);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(39, 23);
this.button1.TabIndex = 4;
this.button1.Text = "清屏";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(339, 4);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(38, 23);
this.button2.TabIndex = 3;
this.button2.Text = "发送";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// button3
//
this.button3.Location = new System.Drawing.Point(383, 4);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(39, 23);
this.button3.TabIndex = 5;
this.button3.Text = "关闭";
this.button3.UseVisualStyleBackColor = true;
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// groupBox1
//
this.groupBox1.Controls.Add(this.textBox3);
this.groupBox1.Controls.Add(this.label5);
this.groupBox1.Controls.Add(this.textBox2);
this.groupBox1.Controls.Add(this.label4);
this.groupBox1.Controls.Add(this.textBox1);
this.groupBox1.Controls.Add(this.label3);
this.groupBox1.Location = new System.Drawing.Point(440, 87);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(109, 165);
this.groupBox1.TabIndex = 8;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "数据传输信息";
//
// textBox3
//
this.textBox3.Location = new System.Drawing.Point(20, 132);
this.textBox3.Name = "textBox3";
this.textBox3.ReadOnly = true;
this.textBox3.Size = new System.Drawing.Size(77, 21);
this.textBox3.TabIndex = 7;
//
// label5
//
this.label5.AutoSize = true;
this.label5.Location = new System.Drawing.Point(8, 115);
this.label5.Name = "label5";
this.label5.Size = new System.Drawing.Size(77, 12);
this.label5.TabIndex = 6;
this.label5.Text = "丢失数据报：";
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(20, 86);
this.textBox2.Name = "textBox2";
this.textBox2.ReadOnly = true;
this.textBox2.Size = new System.Drawing.Size(77, 21);
this.textBox2.TabIndex = 7;
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(8, 69);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(89, 12);
this.label4.TabIndex = 4;
this.label4.Text = "已接收数据报：";
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(20, 40);
this.textBox1.Name = "textBox1";
this.textBox1.ReadOnly = true;
this.textBox1.Size = new System.Drawing.Size(77, 21);
this.textBox1.TabIndex = 6;
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(8, 23);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(89, 12);
this.label3.TabIndex = 2;
this.label3.Text = "已发送数据报：";
//
// label8
//
this.label8.AutoSize = true;
this.label8.Location = new System.Drawing.Point(8, 23);
this.label8.Name = "label8";
this.label8.Size = new System.Drawing.Size(53, 12);
this.label8.TabIndex = 2;
this.label8.Text = "端口号：";
//
// textBox4
//
this.textBox4.Location = new System.Drawing.Point(20, 40);
this.textBox4.Name = "textBox4";
this.textBox4.Size = new System.Drawing.Size(77, 21);
this.textBox4.TabIndex = 0;
this.textBox4.Text = "8888";
//
// groupBox2
//
this.groupBox2.Controls.Add(this.button4);
this.groupBox2.Controls.Add(this.textBox4);
this.groupBox2.Controls.Add(this.label8);
this.groupBox2.Location = new System.Drawing.Point(440, 258);
this.groupBox2.Name = "groupBox2";
this.groupBox2.Size = new System.Drawing.Size(109, 110);
this.groupBox2.TabIndex = 2;
this.groupBox2.TabStop = false;
this.groupBox2.Text = "端口设置";
//
// button4
//
this.button4.Location = new System.Drawing.Point(22, 68);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(75, 32);
this.button4.TabIndex = 1;
this.button4.Text = "设置";
this.button4.UseVisualStyleBackColor = true;
this.button4.Click += new System.EventHandler(this.button4_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(555, 372);
this.Controls.Add(this.groupBox2);
this.Controls.Add(this.groupBox1);
this.Controls.Add(this.splitContainer1);
this.Name = "Form1";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "对数据报进行加密保障通信完全";
this.Load += new System.EventHandler(this.Form1_Load);
this.splitContainer1.Panel1.ResumeLayout(false);
this.splitContainer1.Panel2.ResumeLayout(false);
this.splitContainer1.ResumeLayout(false);
this.splitContainer2.Panel1.ResumeLayout(false);
this.splitContainer2.Panel2.ResumeLayout(false);
this.splitContainer2.ResumeLayout(false);
this.groupBox1.ResumeLayout(false);
this.groupBox1.PerformLayout();
this.groupBox2.ResumeLayout(false);
this.groupBox2.PerformLayout();
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.SplitContainer splitContainer1;
private System.Windows.Forms.RichTextBox rtbContent;
private System.Windows.Forms.SplitContainer splitContainer2;
private System.Windows.Forms.RichTextBox rtbSend;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.TextBox textBox3;
private System.Windows.Forms.Label label5;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label label8;
private System.Windows.Forms.TextBox textBox4;
private System.Windows.Forms.GroupBox groupBox2;
private System.Windows.Forms.Button button4;
}
