实例介绍
【实例简介】
可以用于文本文件或字符串的加密,配置数据库连接字符串时,可以使用到的。
【实例截图】
【核心代码】
using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Security.Cryptography; using System.IO; namespace MyDES { /// <summary> /// Form1 的摘要说明。 /// </summary> public class Form1 : System.Windows.Forms.Form { #region 自动生成的代码 private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private System.Windows.Forms.OpenFileDialog openFileDialog1; private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.Button button3; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.Button button4; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.SaveFileDialog saveFileDialog1; private System.Windows.Forms.Button button5; private System.Windows.Forms.TextBox textBox4; private System.Windows.Forms.Label label3; private System.Windows.Forms.Label label4; /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.Container components = null; public Form1() { // // Windows 窗体设计器支持所必需的 // InitializeComponent(); // // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 // } /// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (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.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog(); this.textBox1 = new System.Windows.Forms.TextBox(); this.button3 = new System.Windows.Forms.Button(); this.textBox2 = new System.Windows.Forms.TextBox(); this.button4 = new System.Windows.Forms.Button(); this.label1 = new System.Windows.Forms.Label(); this.label2 = new System.Windows.Forms.Label(); this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog(); this.button5 = new System.Windows.Forms.Button(); this.textBox4 = new System.Windows.Forms.TextBox(); this.label3 = new System.Windows.Forms.Label(); this.label4 = new System.Windows.Forms.Label(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(444, 75); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(64, 23); this.button1.TabIndex = 0; this.button1.Text = "选择文件"; this.button1.Click = new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(332, 163); this.button2.Name = "button2"; this.button2.TabIndex = 1; this.button2.Text = "退出"; this.button2.Click = new System.EventHandler(this.button2_Click); // // openFileDialog1 // this.openFileDialog1.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*"; this.openFileDialog1.RestoreDirectory = true; this.openFileDialog1.FileOk = new System.ComponentModel.CancelEventHandler(this.openFileDialog1_FileOk); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(108, 75); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(320, 21); this.textBox1.TabIndex = 2; this.textBox1.Text = "请填写或选择输入文件的完整路径"; // // button3 // this.button3.Location = new System.Drawing.Point(132, 163); this.button3.Name = "button3"; this.button3.TabIndex = 3; this.button3.Text = "加密"; this.button3.Click = new System.EventHandler(this.button3_Click); // // textBox2 // this.textBox2.Location = new System.Drawing.Point(108, 112); this.textBox2.Name = "textBox2"; this.textBox2.Size = new System.Drawing.Size(320, 21); this.textBox2.TabIndex = 4; this.textBox2.Text = "请填写或选择目标文件的完整路径"; // // button4 // this.button4.Location = new System.Drawing.Point(444, 115); this.button4.Name = "button4"; this.button4.Size = new System.Drawing.Size(64, 23); this.button4.TabIndex = 5; this.button4.Text = "选择文件"; this.button4.Click = new System.EventHandler(this.button4_Click); // // label1 // this.label1.Location = new System.Drawing.Point(36, 75); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(72, 24); this.label1.TabIndex = 6; this.label1.Text = "输入文件:"; this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; // // label2 // this.label2.Location = new System.Drawing.Point(36, 115); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(72, 24); this.label2.TabIndex = 7; this.label2.Text = "输出文件:"; this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; // // saveFileDialog1 // this.saveFileDialog1.Filter = "所有文件(*.*)|*.*|文本文件(*.txt)|*.txt"; this.saveFileDialog1.FilterIndex = 2; this.saveFileDialog1.RestoreDirectory = true; // // button5 // this.button5.Location = new System.Drawing.Point(236, 163); this.button5.Name = "button5"; this.button5.TabIndex = 8; this.button5.Text = "解密"; this.button5.Click = new System.EventHandler(this.button5_Click); // // textBox4 // this.textBox4.Location = new System.Drawing.Point(108, 35); this.textBox4.Name = "textBox4"; this.textBox4.TabIndex = 10; this.textBox4.Text = "12345678"; // // label3 // this.label3.Location = new System.Drawing.Point(28, 35); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(80, 23); this.label3.TabIndex = 12; this.label3.Text = "指定的 Key:"; this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; // // label4 // this.label4.Location = new System.Drawing.Point(216, 40); this.label4.Name = "label4"; this.label4.Size = new System.Drawing.Size(200, 23); this.label4.TabIndex = 13; this.label4.Text = "(密钥必须为64byte位,既8个字符)"; // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(536, 205); this.Controls.Add(this.label4); this.Controls.Add(this.label3); this.Controls.Add(this.textBox4); this.Controls.Add(this.button5); this.Controls.Add(this.label2); this.Controls.Add(this.label1); this.Controls.Add(this.button4); this.Controls.Add(this.textBox2); this.Controls.Add(this.button3); this.Controls.Add(this.textBox1); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.ForeColor = System.Drawing.SystemColors.ControlText; this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog; this.MaximizeBox = false; this.Name = "Form1"; this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen; this.Text = "简单DES加密器"; this.Load = new System.EventHandler(this.Form1_Load); this.ResumeLayout(false); } #endregion /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } private void Form1_Load(object sender, System.EventArgs e) { } private void button1_Click(object sender, System.EventArgs e) { if(openFileDialog1.ShowDialog() == DialogResult.OK) { this.textBox1.Text=this.openFileDialog1.FileName; } } private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e) { } private void button2_Click(object sender, System.EventArgs e) { this.Close(); } private void button4_Click(object sender, System.EventArgs e) { if(saveFileDialog1.ShowDialog() == DialogResult.OK) { this.textBox2.Text=this.saveFileDialog1.FileName; } } #endregion private void button3_Click(object sender, System.EventArgs e) {//加密 string Key = this.textBox4.Text; string IV = "12345678";//初始化向量设为"12345678" byte[] desKey=System.Text.ASCIIEncoding.ASCII.GetBytes( Key ); byte[] desIV=System.Text.ASCIIEncoding.ASCII.GetBytes( IV ); try { if(this.MyEncrypt(this.textBox1.Text,this.textBox2.Text,desKey,desIV)) MessageBox.Show("文件加密成功"); } catch(System.IO.FileNotFoundException) { MessageBox.Show("Error!\n" "输入文件不存在,请检查输入文件的路径。"); } catch(System.IO.IOException) { MessageBox.Show("Error!\n" "输出文件正在使用,请选择其他文件。\n如果问题依然存在,请关闭该程序,重新运行!"); } catch(System.Exception ee) { System.Windows.Forms.MessageBox.Show("未知错误!请认真阅读一下说明:\n" ee); } } private void button5_Click(object sender, System.EventArgs e) {//解密 string Key = this.textBox4.Text; string IV = "12345678";//初始化向量设为"12345678" byte[] desKey=System.Text.ASCIIEncoding.ASCII.GetBytes(Key); byte[] desIV=System.Text.ASCIIEncoding.ASCII.GetBytes(IV); try { if(this.MyDecrypt(this.textBox1.Text,this.textBox2.Text,desKey,desIV)) MessageBox.Show("文件解密成功"); } catch(System.IO.FileNotFoundException) { MessageBox.Show("Error!\n" "输入文件不存在,请检查输入文件的路径。"); } catch(System.IO.IOException) { MessageBox.Show("Error!\n" "输出文件正在使用,请选择其他文件。\n如果问题依然存在,请关闭该程序,重新运行!"); } catch(System.Exception ee) { System.Windows.Forms.MessageBox.Show("未知错误!请认真阅读一下说明:\n" ee); } } #region 文件加密函数 private bool MyEncrypt(String inName, String outName, byte[] desKey, byte[] desIV) { FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write); try { fout.SetLength(0); byte[] bin = new byte[100]; long rdlen = 0; long totlen = fin.Length; int len; DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while(rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen len; } encStream.Close(); fout.Close(); fin.Close(); } catch(System.Security.Cryptography.CryptographicException) { MessageBox.Show("Error!\n" "密钥输入错误!\n密钥必须为 64 byte,既为8个字符!"); fin.Close(); fout.Close(); return false; } catch(Exception e) { MessageBox.Show("Error\n" e); return false; } return true; } #endregion #region 文件解密函数 private bool MyDecrypt(String inName, String outName, byte[] desKey, byte[] desIV) { FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write); try { fout.SetLength(0); byte[] bin = new byte[100]; long rdlen = 0; long totlen = fin.Length; int len; DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while(rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen len; } encStream.Close(); fout.Close(); fin.Close(); } catch(System.Security.Cryptography.CryptographicException) { MessageBox.Show("Error!\n" "密钥和加密文件不匹配!\n" "可能的原因有:\n" "1.输入的密钥错误,请重新输入和加密文件相对应的正确密钥。\n" "2.输入文件是没有加密过的文件,请选择已经加密的文件进行解密。"); fin.Close(); fout.Close(); return false; } catch(Exception e) { MessageBox.Show("Error\n" e); return false; } return true; } #endregion } }
标签: DES encryption Decrypt 加密 加解密
相关软件
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