C#实现对文件进行加密保护的示例代码
作者:芝麻粒儿
这篇文章主要为大家详细介绍了如何利用C#实现对文件进行加密保护的功能,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(); CheckForIllegalCrossThreadCalls = false; } private void Form1_Load(object sender, EventArgs e) { FileMenu(Application.ExecutablePath + ",0", Application.ExecutablePath); string[] str = Environment.GetCommandLineArgs(); try { string strFile = ""; for (int i = 2; i < str.Length; i++) strFile += str[i]; FileInfo FInfo = new FileInfo(strFile); if (FInfo.Extension.ToLower() == ".mr") { textBox1.Text = strFile; button2.Enabled = false; button3.Enabled = true; } } catch { } } //选择加密、解密文件 private void button1_Click(object sender, EventArgs e) { if (openFileDialog1.ShowDialog() == DialogResult.OK) { textBox1.Text = openFileDialog1.FileName; FileInfo FInfo = new FileInfo(textBox1.Text); if (FInfo.Extension.ToLower() == ".mr") { button2.Enabled = false; button3.Enabled = true; } else { button2.Enabled = true; button3.Enabled = false; } } } //加密 private void button2_Click(object sender, EventArgs e) { if (textBox1.Text != "") { if (textBox2.Text.Length < 6) MessageBox.Show("密码不能小于6位!", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning); else { EDncrypt myEDncrypt = new EDncrypt(textBox1.Text, textBox2.Text, progressBar1); myEDncrypt.StartEncrypt(); progressBar1.Value = 0; } } } //解密 private void button3_Click(object sender, EventArgs e) { if (textBox1.Text != "") { if (textBox2.Text.Length < 6) MessageBox.Show("密码不能小于6位!", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning); else { EDncrypt myEDncrypt = new EDncrypt(textBox1.Text, textBox2.Text, progressBar1); myEDncrypt.StartDncrypt(); progressBar1.Value = 0; } } } //创建快捷菜单 public static void FileMenu(string strPath, string strName) { try { Registry.ClassesRoot.CreateSubKey(".mr"); RegistryKey RKey1 = Registry.ClassesRoot.OpenSubKey(".mr", true); RKey1.SetValue("", "mrfile"); RKey1.Close(); Registry.ClassesRoot.CreateSubKey("mrfile"); RegistryKey RKey2 = Registry.ClassesRoot.OpenSubKey("mrfile", true); RKey2.CreateSubKey("DefaultIcon"); RKey2.CreateSubKey("shell"); RKey2.Close(); RegistryKey RKey3 = Registry.ClassesRoot.OpenSubKey("mrfile\\DefaultIcon", true); RKey3.SetValue("", strPath); RKey3.Close(); RegistryKey RKey4 = Registry.ClassesRoot.OpenSubKey("mrfile\\shell", true); RKey4.CreateSubKey("解密"); RKey4.Close(); RegistryKey RKey5 = Registry.ClassesRoot.OpenSubKey("mrfile\\shell\\解密", true); RKey5.CreateSubKey("command"); RKey5.Close(); RegistryKey RKey6 = Registry.ClassesRoot.OpenSubKey("mrfile\\shell\\解密\\command", true); RKey6.SetValue("", strName + " \\F %1"); RKey6.Close(); } catch { } } } #region 加密、解密类 class EDncrypt { #region 定义全局变量及类对象 private string strFile = ""; private string strNewFile = ""; private string strPwd = ""; private ProgressBar PBar = null; private Thread EThread = null; private Thread DThread = null; #endregion //含参数的构造函数,用来初始化全局变量及对象 public EDncrypt(string name, string pwd, ProgressBar pb) { strFile = name; strPwd = pwd; PBar = pb; EThread = new Thread(new ThreadStart(this.myEThread)); DThread = new Thread(new ThreadStart(this.myDThread)); } //文件加密 private void myEThread() { byte[] btRKey = new byte[0]; if (strPwd.Length == 6) { btRKey = new byte[] { (byte) strPwd[0], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4], (byte) strPwd[5], (byte) strPwd[0], (byte) strPwd[1] }; } if (strPwd.Length == 7) { btRKey = new byte[] { (byte) strPwd[0], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4], (byte) strPwd[5], (byte) strPwd[6], (byte) strPwd[0] }; } if (strPwd.Length >= 8) { btRKey = new byte[] { (byte) strPwd[0], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4], (byte) strPwd[5], (byte) strPwd[6], (byte) strPwd[7] }; } FileStream FStream = new FileStream(strFile, FileMode.Open, FileAccess.Read); FileStream NewFStream = new FileStream(strFile + ".mr", FileMode.OpenOrCreate, FileAccess.Write); NewFStream.SetLength((long) 0); byte[] buffer = new byte[0x400]; int MinNum = 0; long length = FStream.Length; int MaxNum = (int) (length / ((long) 0x400)); PBar.Maximum = MaxNum; DES myDES = new DESCryptoServiceProvider(); CryptoStream CStream = new CryptoStream(NewFStream, myDES.CreateEncryptor(btRKey, btRKey), CryptoStreamMode.Write); while (MinNum < length) { int count = FStream.Read(buffer, 0, 0x400); CStream.Write(buffer, 0, count); MinNum += count; try { if (PBar.Value < PBar.Maximum) { PBar.Value++; } } catch { } } CStream.Close(); NewFStream.Close(); FStream.Close(); File.Delete(strFile); MessageBox.Show("文件加密成功!", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } //运行加密线程 public void StartEncrypt() { EThread.Start(); } //文件解密 private void myDThread() { FileStream FStream = null; FileStream NewFStream = null; CryptoStream CStream = null; try { try { byte[] btRKey = new byte[0]; if (strPwd.Length == 6) { btRKey = new byte[] { (byte) strPwd[0], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4], (byte) strPwd[5], (byte) strPwd[0], (byte) strPwd[1] }; } if (strPwd.Length == 7) { btRKey = new byte[] { (byte) strPwd[0], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4], (byte) strPwd[5], (byte) strPwd[6], (byte) strPwd[0] }; } if (strPwd.Length >= 8) { btRKey = new byte[] { (byte) strPwd[0], (byte) strPwd[1], (byte) strPwd[2], (byte) strPwd[3], (byte) strPwd[4], (byte) strPwd[5], (byte) strPwd[6], (byte) strPwd[7] }; } FStream = new FileStream(strFile, FileMode.Open, FileAccess.Read); strNewFile = strFile.Substring(0, strFile.Length - 3); NewFStream = new FileStream(strNewFile, FileMode.OpenOrCreate, FileAccess.Write); NewFStream.SetLength((long) 0); byte[] buffer = new byte[0x400]; int MinNum = 0; long length = FStream.Length; int MaxNum = (int) (length / ((long) 0x400)); PBar.Maximum = MaxNum; DES myDES = new DESCryptoServiceProvider(); CStream = new CryptoStream(NewFStream, myDES.CreateDecryptor(btRKey, btRKey), CryptoStreamMode.Write); while (MinNum < length) { int count = FStream.Read(buffer, 0, 0x400); CStream.Write(buffer, 0, count); MinNum += count; try { if (PBar.Value < PBar.Maximum) { PBar.Value++; } } catch { } } MessageBox.Show("文件解密成功!", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } catch { MessageBox.Show("文件解密失败!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error); } } finally { CStream.Close(); FStream.Close(); NewFStream.Close(); } } //运行解密线程 public void StartDncrypt() { DThread.Start(); } } #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.label1 = new System.Windows.Forms.Label(); this.textBox1 = new System.Windows.Forms.TextBox(); this.button1 = new System.Windows.Forms.Button(); this.label2 = new System.Windows.Forms.Label(); this.textBox2 = new System.Windows.Forms.TextBox(); this.label3 = new System.Windows.Forms.Label(); this.label4 = new System.Windows.Forms.Label(); this.progressBar1 = new System.Windows.Forms.ProgressBar(); this.groupBox1 = new System.Windows.Forms.GroupBox(); this.button2 = new System.Windows.Forms.Button(); this.button3 = new System.Windows.Forms.Button(); this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog(); this.groupBox1.SuspendLayout(); this.SuspendLayout(); // // label1 // this.label1.AutoSize = true; this.label1.Location = new System.Drawing.Point(6, 17); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(161, 12); this.label1.TabIndex = 0; this.label1.Text = "请选择要加密或解密的文件:"; // // textBox1 // this.textBox1.Location = new System.Drawing.Point(32, 35); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(263, 21); this.textBox1.TabIndex = 1; // // button1 // this.button1.Location = new System.Drawing.Point(301, 33); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(33, 23); this.button1.TabIndex = 2; this.button1.Text = "…"; this.button1.UseVisualStyleBackColor = true; this.button1.Click += new System.EventHandler(this.button1_Click); // // label2 // this.label2.AutoSize = true; this.label2.Location = new System.Drawing.Point(7, 71); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(83, 12); this.label2.TabIndex = 3; this.label2.Text = "加/解密密码:"; // // textBox2 // this.textBox2.Location = new System.Drawing.Point(92, 68); this.textBox2.Name = "textBox2"; this.textBox2.PasswordChar = '*'; this.textBox2.Size = new System.Drawing.Size(151, 21); this.textBox2.TabIndex = 4; // // label3 // this.label3.AutoSize = true; this.label3.ForeColor = System.Drawing.Color.Red; this.label3.Location = new System.Drawing.Point(243, 71); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(95, 12); this.label3.TabIndex = 5; this.label3.Text = "(密码应大于6位)"; // // label4 // this.label4.AutoSize = true; this.label4.Location = new System.Drawing.Point(7, 101); this.label4.Name = "label4"; this.label4.Size = new System.Drawing.Size(83, 12); this.label4.TabIndex = 6; this.label4.Text = "加/解密进度:"; // // progressBar1 // this.progressBar1.Location = new System.Drawing.Point(92, 99); this.progressBar1.Name = "progressBar1"; this.progressBar1.Size = new System.Drawing.Size(242, 18); this.progressBar1.TabIndex = 7; // // groupBox1 // this.groupBox1.Controls.Add(this.label1); this.groupBox1.Controls.Add(this.progressBar1); this.groupBox1.Controls.Add(this.textBox1); this.groupBox1.Controls.Add(this.label4); this.groupBox1.Controls.Add(this.button1); this.groupBox1.Controls.Add(this.label3); this.groupBox1.Controls.Add(this.label2); this.groupBox1.Controls.Add(this.textBox2); this.groupBox1.Location = new System.Drawing.Point(5, 5); this.groupBox1.Name = "groupBox1"; this.groupBox1.Size = new System.Drawing.Size(342, 123); this.groupBox1.TabIndex = 8; this.groupBox1.TabStop = false; this.groupBox1.Text = "文件加/解密设置"; // // button2 // this.button2.Enabled = false; this.button2.Location = new System.Drawing.Point(223, 134); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(59, 27); this.button2.TabIndex = 9; this.button2.Text = "加密"; this.button2.UseVisualStyleBackColor = true; this.button2.Click += new System.EventHandler(this.button2_Click); // // button3 // this.button3.Enabled = false; this.button3.Location = new System.Drawing.Point(288, 134); this.button3.Name = "button3"; this.button3.Size = new System.Drawing.Size(59, 27); this.button3.TabIndex = 9; this.button3.Text = "解密"; this.button3.UseVisualStyleBackColor = true; this.button3.Click += new System.EventHandler(this.button3_Click); // // openFileDialog1 // this.openFileDialog1.FileName = "openFileDialog1"; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(353, 167); this.Controls.Add(this.button3); this.Controls.Add(this.button2); this.Controls.Add(this.groupBox1); this.MaximizeBox = false; this.Name = "Form1"; this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen; this.Text = "对文件进行加密保护"; this.Load += new System.EventHandler(this.Form1_Load); this.groupBox1.ResumeLayout(false); this.groupBox1.PerformLayout(); this.ResumeLayout(false); } #endregion private System.Windows.Forms.Label label1; private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.Button button1; private System.Windows.Forms.Label label2; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.Label label3; private System.Windows.Forms.Label label4; private System.Windows.Forms.ProgressBar progressBar1; private System.Windows.Forms.GroupBox groupBox1; private System.Windows.Forms.Button button2; private System.Windows.Forms.Button button3; private System.Windows.Forms.OpenFileDialog openFileDialog1; }
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