C#-对称加密的一个例子

这个小程序,算不上什么.为了节省时间.请看代码!

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 对称加密应用{ /// /// Form1 的摘要说明。 /// public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; /// /// 必需的设计器变量。 private System.Windows.Forms.TextBox textBox3; private System.Windows.Forms.OpenFileDialog openfile; private System.Windows.Forms.Button button3; private System.Windows.Forms.SaveFileDialog savefile; private System.Windows.Forms.Button button4; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.CheckBox checkBox1;
//创建实例 RijndaelManaged rij = new RijndaelManaged();// //全局变量，标记文件的扩展名 private static string ext=null; //标记加密成功与否 private static bool enresult = false; //标记解密成功与否的标记 private static bool deresult = false; /// 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 // }
/// /// 清理所有正在使用的资源。 /// 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 /// /// 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。 /// private void InitializeComponent() { this.textBox1 = new System.Windows.Forms.TextBox(); this.textBox2 = new System.Windows.Forms.TextBox(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.textBox3 = new System.Windows.Forms.TextBox(); this.openfile = new System.Windows.Forms.OpenFileDialog(); this.button3 = new System.Windows.Forms.Button(); this.savefile = new System.Windows.Forms.SaveFileDialog(); this.button4 = new System.Windows.Forms.Button(); this.label1 = new System.Windows.Forms.Label(); this.label2 = new System.Windows.Forms.Label(); this.checkBox1 = new System.Windows.Forms.CheckBox(); this.SuspendLayout(); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(88, 96); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(168, 21); this.textBox1.TabIndex = 0; this.textBox1.Text = ""; // // textBox2 // this.textBox2.Location = new System.Drawing.Point(88, 136); this.textBox2.Name = "textBox2"; this.textBox2.Size = new System.Drawing.Size(168, 21); this.textBox2.TabIndex = 1; this.textBox2.Text = ""; // // button1 // this.button1.Location = new System.Drawing.Point(88, 200); this.button1.Name = "button1"; this.button1.TabIndex = 2; this.button1.Text = "加密"; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(192, 200); this.button2.Name = "button2"; this.button2.TabIndex = 3; this.button2.Text = "解密"; this.button2.Click += new System.EventHandler(this.button2_Click); // // textBox3 // this.textBox3.HideSelection = false; this.textBox3.Location = new System.Drawing.Point(88, 48); this.textBox3.MaxLength = 17; this.textBox3.Name = "textBox3"; this.textBox3.PasswordChar = '$'; this.textBox3.TabIndex = 4; this.textBox3.Text = ""; this.textBox3.TextAlign = System.Windows.Forms.HorizontalAlignment.Center; // // button3 // this.button3.Location = new System.Drawing.Point(280, 96); this.button3.Name = "button3"; this.button3.Size = new System.Drawing.Size(40, 23); this.button3.TabIndex = 5; this.button3.Text = "Open"; this.button3.Click += new System.EventHandler(this.button3_Click); // // button4 // this.button4.Location = new System.Drawing.Point(280, 136); this.button4.Name = "button4"; this.button4.Size = new System.Drawing.Size(40, 23); this.button4.TabIndex = 6; this.button4.Text = "Save"; this.button4.Click += new System.EventHandler(this.button4_Click); // // label1 // this.label1.Location = new System.Drawing.Point(88, 24); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(136, 23); this.label1.TabIndex = 7; this.label1.Text = "请输入你的密码："; // // label2 // this.label2.Location = new System.Drawing.Point(216, 48); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(184, 23); this.label2.TabIndex = 8; this.label2.Text = "（密码大小8至16个字符）"; // // checkBox1 // this.checkBox1.Location = new System.Drawing.Point(88, 168); this.checkBox1.Name = "checkBox1"; this.checkBox1.Size = new System.Drawing.Size(216, 24); this.checkBox1.TabIndex = 9; this.checkBox1.Text = "删除源文件"; // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(456, 278); this.Controls.Add(this.checkBox1); this.Controls.Add(this.label2); this.Controls.Add(this.label1); this.Controls.Add(this.button4); this.Controls.Add(this.button3); this.Controls.Add(this.textBox3); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.textBox2); this.Controls.Add(this.textBox1); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false);
} #endregion
/// /// 应用程序的主入口点。 /// [STAThread] static void Main() { Application.Run(new Form1()); }
//加密文件的按钮 private void button1_Click(object sender, System.EventArgs e) { if(textBox1.Text != null || textBox2.Text != null) encryption(textBox3.Text,textBox1.Text,textBox2.Text); if(checkBox1.Checked==true && enresult==true) DeleteFile(textBox1.Text); } //用于加密的函数 public void encryption(string textBox,string readfile,string writefile) { try { if(textBox.Length >=8 && textBox.Length<=16 )//判断密码的字符的大小 { byte [] key = System.Text.Encoding.Default.GetBytes( textBox ); byte [] iv = rij.IV; Rijndael crypt = Rijndael.Create(); ICryptoTransform transform = crypt.CreateEncryptor(key ,iv); //写进文件 FileStream fswrite = new FileStream(writefile,FileMode.Create); CryptoStream cs = new CryptoStream( fswrite ,transform ,CryptoStreamMode.Write ); //打开文件 FileStream fsread = new FileStream(readfile,FileMode.Open); int length; while((length = fsread.ReadByte() )!= -1) cs.WriteByte((byte)length);
fsread.Close(); cs.Close(); fswrite.Close(); enresult = true ;//成功加密 MessageBox.Show("已经成功完成加密任务！"); } else {　 　　　　MessageBox.Show("密码的最小长度为8个字符，最大长度为16个字符！"); return ; } } catch (Exception e) { MessageBox.Show(e.ToString()); } } //用于解密的函数 public void decryption(string textBox,string readfile,string writefile) { try { if(textBox.Length >=8 && textBox.Length<=16 ) { byte [] key = System.Text.Encoding.Default.GetBytes( textBox ); byte [] iv = rij.IV; Rijndael crypt = Rijndael.Create(); ICryptoTransform transform = crypt.CreateDecryptor(key,iv); //读取加密后的文件 FileStream fsopen = new FileStream(readfile,FileMode.Open); CryptoStream cs = new CryptoStream( fsopen ,transform ,CryptoStreamMode.Read ); //把解密后的结果写进文件 FileStream fswrite = new FileStream(writefile,FileMode.OpenOrCreate); int length; while ((length = cs.ReadByte()) != -1) fswrite.WriteByte((byte)length);
fswrite.Close(); cs.Close(); fsopen.Close(); deresult=true; //成功解密 MessageBox.Show("已经成功完成解密任务！"); } else {　 　　　　MessageBox.Show("密码的最小长度为8个字符，最大长度为16个字符！"); return ; } } catch (Exception e) { MessageBox.Show(e.ToString()); } } //解密文件 private void button2_Click(object sender, System.EventArgs e) { decryption( textBox3.Text,textBox1.Text,textBox2.Text ) ; if(checkBox1.Checked==true && deresult==true) DeleteFile(textBox1.Text); } //用于打开文件的按钮 private void button3_Click(object sender, System.EventArgs e) { openfile = new OpenFileDialog();openfile.Filter ="All files (*.*)|*.*" ; openfile.ShowDialog(); textBox1.Text = openfile.FileName; ext = getfileext(openfile.FileName); }
private void button4_Click(object sender, System.EventArgs e) { savefile = new SaveFileDialog(); savefile.Filter =ext + " files" +"(*."+ext+")|*."+ ext +"|All files (*.*)|*.*" ; savefile.ShowDialog(); textBox2.Text = savefile.FileName; } //得到文件的扩展名 private string getfileext(string filename) { try { char [] point = new char[] {'.'}; string [] filename2 = filename.Split(point); return filename2[1]; } catch { return null; } } //删除文件的函数 public void DeleteFile(string filename) { try { File.Delete(filename); } catch (Exception e) { MessageBox.Show(e.ToString()); } }
}}