昨天搞明白了编码的问题后，就开始写这个有些实用价值的东西。
这个软件实现了文本文件的TripeDES的加密（其它的对称加密是类似的）
学习这个的朋友可以参照一下，希望对你们有帮助。
我不是专门写软件的，更不是软件专业。
说它有用也好，没用也罢。只是兴趣，此前不至空虚罢了。
下面是源程序：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;
using System.Diagnostics;
namespace TripleDES
{
public partial class TdesEncryptExample : Form
{
#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()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(TdesEncryptExample));
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.txtKey = new System.Windows.Forms.TextBox();
this.btnFun = new System.Windows.Forms.Button();
this.linkLabel1 = new System.Windows.Forms.LinkLabel();
this.label4 = new System.Windows.Forms.Label();
this.label5 = new System.Windows.Forms.Label();
this.txtFilePath = new System.Windows.Forms.TextBox();
this.btnScan = new System.Windows.Forms.Button();
this.btnExit = new System.Windows.Forms.Button();
this.label3 = new System.Windows.Forms.Label();
this.cmbPasswordHelp = new System.Windows.Forms.ComboBox();
this.statusStrip1 = new System.Windows.Forms.StatusStrip();
this.tsslable = new System.Windows.Forms.ToolStripStatusLabel();
this.statusStrip1.SuspendLayout();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(25, 37);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(47, 12);
this.label1.TabIndex = 0;
this.label1.Text = "源文件:";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(25, 108);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(35, 12);
this.label2.TabIndex = 0;
this.label2.Text = "密码:";
//
// txtKey
//
this.txtKey.ImeMode = System.Windows.Forms.ImeMode.On;
this.txtKey.Location = new System.Drawing.Point(89, 105);
this.txtKey.Name = "txtKey";
this.txtKey.Size = new System.Drawing.Size(180, 21);
this.txtKey.TabIndex = 2;
this.txtKey.UseSystemPasswordChar = true;
this.txtKey.MouseLeave += new System.EventHandler(this.txtKey_MouseLeave);
this.txtKey.MouseEnter += new System.EventHandler(this.txtKey_MouseEnter);
//
// btnFun
//
this.btnFun.Location = new System.Drawing.Point(168, 168);
this.btnFun.Name = "btnFun";
this.btnFun.Size = new System.Drawing.Size(72, 23);
this.btnFun.TabIndex = 4;
this.btnFun.Text = "操作";
this.btnFun.UseVisualStyleBackColor = true;
this.btnFun.Click += new System.EventHandler(this.btnFun_Click);
//
// linkLabel1
//
this.linkLabel1.AutoSize = true;
this.linkLabel1.Location = new System.Drawing.Point(306, 217);
this.linkLabel1.Name = "linkLabel1";
this.linkLabel1.Size = new System.Drawing.Size(41, 12);
this.linkLabel1.TabIndex = 6;
this.linkLabel1.TabStop = true;
this.linkLabel1.Text = "夏阳港";
this.linkLabel1.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked);
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(283, 217);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(17, 12);
this.label4.TabIndex = 6;
this.label4.Text = "by";
//
// label5
//
this.label5.AutoSize = true;
this.label5.Location = new System.Drawing.Point(298, 112);
this.label5.Name = "label5";
this.label5.Size = new System.Drawing.Size(125, 12);
this.label5.TabIndex = 7;
this.label5.Text = "(密码长度为6到24位）";
//
// txtFilePath
//
this.txtFilePath.Location = new System.Drawing.Point(89, 34);
this.txtFilePath.Name = "txtFilePath";
this.txtFilePath.Size = new System.Drawing.Size(334, 21);
this.txtFilePath.TabIndex = 0;
this.txtFilePath.MouseLeave += new System.EventHandler(this.txtFilePath_MouseLeave);
this.txtFilePath.MouseEnter += new System.EventHandler(this.txtFilePath_MouseEnter);
this.txtFilePath.TextChanged += new System.EventHandler(this.txtFilePath_TextChanged);
//
// btnScan
//
this.btnScan.Location = new System.Drawing.Point(368, 66);
this.btnScan.Name = "btnScan";
this.btnScan.Size = new System.Drawing.Size(55, 23);
this.btnScan.TabIndex = 3;
this.btnScan.Text = "浏览";
this.btnScan.UseVisualStyleBackColor = true;
this.btnScan.Click += new System.EventHandler(this.btnScan_Click);
//
// btnExit
//
this.btnExit.Location = new System.Drawing.Point(262, 168);
this.btnExit.Name = "btnExit";
this.btnExit.Size = new System.Drawing.Size(72, 23);
this.btnExit.TabIndex = 5;
this.btnExit.Text = "退出";
this.btnExit.UseVisualStyleBackColor = true;
this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(25, 72);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(59, 12);
this.label3.TabIndex = 0;
this.label3.Text = "密码提示:";
//
// cmbPasswordHelp
//
this.cmbPasswordHelp.FormattingEnabled = true;
this.cmbPasswordHelp.Items.AddRange(new object[] {
"我的爸爸的名字？",
"我的妈妈的名字？",
"我最喜欢的小狗叫什么？",
"我在哪所学校上的高中？"});
this.cmbPasswordHelp.Location = new System.Drawing.Point(89, 69);
this.cmbPasswordHelp.Name = "cmbPasswordHelp";
this.cmbPasswordHelp.Size = new System.Drawing.Size(240, 20);
this.cmbPasswordHelp.TabIndex = 1;
this.cmbPasswordHelp.MouseEnter += new System.EventHandler(this.cmbPasswordHelp_MouseEnter);
this.cmbPasswordHelp.MouseLeave += new System.EventHandler(this.cmbPasswordHelp_MouseLeave);
//
// statusStrip1
//
this.statusStrip1.AutoSize = false;
this.statusStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
this.tsslable});
this.statusStrip1.Location = new System.Drawing.Point(0, 242);
this.statusStrip1.Name = "statusStrip1";
this.statusStrip1.ShowItemToolTips = true;
this.statusStrip1.Size = new System.Drawing.Size(474, 22);
this.statusStrip1.TabIndex = 12;
this.statusStrip1.Text = "哈 哈 ";
//
// tsslable
//
this.tsslable.AutoSize = false;
this.tsslable.Name = "tsslable";
this.tsslable.Size = new System.Drawing.Size(450, 17);
this.tsslable.Text = "小朋";
//
// TdesEncryptExample
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(474, 264);
this.Controls.Add(this.statusStrip1);
this.Controls.Add(this.cmbPasswordHelp);
this.Controls.Add(this.btnExit);
this.Controls.Add(this.btnScan);
this.Controls.Add(this.txtFilePath);
this.Controls.Add(this.label5);
this.Controls.Add(this.label4);
this.Controls.Add(this.linkLabel1);
this.Controls.Add(this.btnFun);
this.Controls.Add(this.txtKey);
this.Controls.Add(this.label3);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.MaximizeBox = false;
this.Name = "TdesEncryptExample";
this.Text = "文本文件加密器";
this.Load += new System.EventHandler(this.TdesEncryptExample_Load);
this.statusStrip1.ResumeLayout(false);
this.statusStrip1.PerformLayout();
this.ResumeLayout(false);
this.PerformLayout();
}
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox txtKey;
private System.Windows.Forms.Button btnFun;
private System.Windows.Forms.LinkLabel linkLabel1;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Label label5;
#endregion
public TdesEncryptExample()
{
InitializeComponent();
}
#region 参数声明
private TripleDESCryptoServiceProvider crypt = null;
private bool IsToEncrypt = true; //指示是进行加密还是解密。
private byte[] key;
private byte[] IV;
private string strMain = "本软件用于对文件文件(.txt)的加密解密";
#endregion
private void TdesEncryptExample_Load(object sender, EventArgs e)
{
crypt = new TripleDESCryptoServiceProvider();
key = new byte[24];
IV = new byte[8];
tsslable.Text = strMain;
}
private string EncryptText(string str, byte[] Key, byte[] IV)
{
try
{
//创建一个内存流。
MemoryStream memoryStream = new MemoryStream();
ICryptoTransform transToBase64 = new ToBase64Transform();
CryptoStream csEncode = new CryptoStream(memoryStream,
transToBase64, CryptoStreamMode.Write);
//使用传递的私钥和IV创建加密流。
CryptoStream cryptoStream = new CryptoStream(csEncode,
crypt.CreateEncryptor(Key, IV),
CryptoStreamMode.Write);
StreamWriter w = new StreamWriter(cryptoStream);
try
{
//将字节数组写入加密流，并清除缓冲区
w.Write(str);
w.Flush();
cryptoStream.FlushFinalBlock();
//得到加密后的字节数组。
byte[] encryptedBytes = memoryStream.ToArray();
string encryptedString = Encoding.UTF8.GetString(encryptedBytes);
return encryptedString;
}
catch (CryptographicException err)
{
throw new Exception("加密出错：" + err.Message);
}
finally
{
cryptoStream.Close();
memoryStream.Close();
}
}
catch (Exception err)
{
MessageBox.Show(err.Message);
return null;
}
}
private string DecryptText(string ToDecryptString, byte[] Key, byte[] IV)
{
byte[] ToDecryptBytes=Encoding.UTF8.GetBytes(ToDecryptString);
//根据加密后的字节数组创建一个内存流。
MemoryStream memoryStream = new MemoryStream(ToDecryptBytes);
//Transform string from database64;
ICryptoTransform transformFromBase64 = new FromBase64Transform();
CryptoStream csDecode = new CryptoStream(memoryStream,
transformFromBase64, CryptoStreamMode.Read);
//使用传递的私钥、IV和内存流创建解密流。
CryptoStream cryptoStream = new CryptoStream(csDecode,
crypt.CreateDecryptor(Key, IV),CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cryptoStream);
try
{
//得到解密后的字符串。
string decryptedString = sr.ReadToEnd();
return decryptedString;
}
catch (CryptographicException err)
{
throw new Exception("解密出错:" + err.Message);
}
finally
{
sr.Close();
cryptoStream.Close();
memoryStream.Close();
}
}
private void SetKeyAndIV(string str)
{
//验证密码的可用性.
if (str.Length == 0)
{
throw new Exception("密码为空。");
}
if (str.Length < 6)
{
throw new Exception("密码设置太短。");
}
if (str.Length > 24)
{
throw new Exception("密码设置太长。");
}
byte[] temp = Encoding.UTF8.GetBytes(str);
int len = temp.Length;
for (int i = 0; i < len; i++)
{
key[23 - i] = temp[i];
}
//填满其余值。
for (int i = len; i < 24; i++)
{
key[23 - i] = (byte)i;
}
IV = new byte[8];
for (int i = 0; i < 8; i++)
{
IV[i] = key[i * 3];
}
}
private void btnFun_Click(object sender, EventArgs e)
{
string strPath = txtFilePath.Text;
string saveFilePath;
string FileName;
if (strPath == "")
{
MessageBox.Show("源文件为空！", "提示", MessageBoxButtons.OK,
MessageBoxIcon.Exclamation);
return;
}
if (File.Exists(strPath) == false)
{
MessageBox.Show("源文件不存在！", "提示", MessageBoxButtons.OK,
MessageBoxIcon.Exclamation);
return;
}
if (IsTxtFile(strPath)==false)
{
MessageBox.Show("本程序只能加密解密文本文件！","提示",
MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
return;
}
int i1 = strPath.LastIndexOf('.');
int i2 = strPath.LastIndexOf('\\');
saveFilePath = strPath.Substring(0, i2);
FileName = strPath.Substring(i2 + 1, i1 - i2 - 1);
if (IsToEncrypt == true)
{
try
{
SetKeyAndIV(txtKey.Text);
}
catch (Exception er)
{
MessageBox.Show("对不起，您的" + er.Message, "提示",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
try
{
//读入加密数据
FileStream fs = new FileStream(txtFilePath.Text, FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs, Encoding.Default);
string strToEncrypt = sr.ReadToEnd();
sr.Close();
fs.Close();
string stringEncrypted = EncryptText(strToEncrypt, key, IV);
FileName = FunOfFileName(FileName);
string strNewFilename = saveFilePath + "\\" + FileName + "-加密文本.txt";
if (File.Exists(strNewFilename))
{
if (MessageBox.Show("文件\"" + FileName + "-加密文本.txt\"在当前目录下己存在,是否替换?",
"提示", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.No)
{
return;
}
}
FileStream fs2 = new FileStream(saveFilePath + "\\" + FileName + "-加密文本.txt",
FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs2);
sw.WriteLine("密码提示:" + (cmbPasswordHelp.Text == "" ? "无" : cmbPasswordHelp.Text));
sw.Write(stringEncrypted);
sw.Flush();
sw.Close();
fs2.Close();
MessageBox.Show("恭喜文件加密成功,加密文档己存于加密文件的同一个目录下。",
"提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception err)
{
MessageBox.Show(err.Message);
return;
}
}
else
{
//-------------------------------执行解密操作
string stringDecrypted;
try
{
SetKeyAndIV(txtKey.Text);
//读取加密string.
FileStream fs = new FileStream(strPath,
FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
sr.ReadLine();
string stringToDecrypt = sr.ReadToEnd();
sr.Close();
fs.Close();
stringDecrypted = DecryptText(stringToDecrypt, key, IV);
}
catch
{
MessageBox.Show("对不起,您的密码不正确。",
"提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
try
{
FileName = FunOfFileName(FileName);
string strNewFilename = saveFilePath + "\\" + FileName + "-解密文本.txt";
if (File.Exists(strNewFilename))
{
if (MessageBox.Show("文件\"" + FileName + "-解密文本.txt\"在当前目录下己存在,是否替换?",
"提示", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.No)
{
return;
}
}
FileStream fs = new FileStream(strNewFilename,
FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs);
sw.Write(stringDecrypted);
sw.Flush();
sw.Close();
fs.Close();
}
catch (Exception err)
{
MessageBox.Show(err.Message, "提示",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
MessageBox.Show("恭喜文件解密成功,解密文档己存于加密文件的同一个目录下。",
"提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
Process.Start("http://shyanye.cnblogs.com/");
}
private void btnScan_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "文本文件(.txt)|*.txt";
DialogResult temp=openFileDialog.ShowDialog();
if (temp == DialogResult.OK)
{
txtFilePath.Text = openFileDialog.FileName;
}
}
private void txtFilePath_TextChanged(object sender, EventArgs e)
{
if (File.Exists(txtFilePath.Text) == true)
{
//不是文件文件则直接返回
if (IsTxtFile(txtFilePath.Text) == false)
{
return;
}
FileStream fs = new FileStream(txtFilePath.Text,
FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
string str = sr.ReadLine();
sr.Close();
fs.Close();
try
{
//只有前五个字条是下列才认为是进行解密操作
if (str.Substring(0, 5) == "密码提示:")
{
//是执行解密算法
cmbPasswordHelp.Text = str.Substring(5);
cmbPasswordHelp.Enabled = false;
IsToEncrypt = false;
return;
}
throw new Exception();
}
catch
{
//是执行加密算法
cmbPasswordHelp.Text = "";
cmbPasswordHelp.Enabled = true;
IsToEncrypt = true;
}
}
}
private bool IsTxtFile(string strPath)
{
try
{
int i = strPath.LastIndexOf('.');
string fileType = strPath.Substring(i + 1, 3);
fileType = fileType.ToLowerInvariant();
if (fileType == "txt")
{
return true;
}
return false;
}
catch
{
return false;
}
}
private string FunOfFileName(string fileName)
{
try
{
int i = fileName.LastIndexOf('-');
string str = fileName.Substring(i + 1);
string str2 = fileName.Substring(0, i);
if (str == "加密文本" || str == "解密文本")
{
return str2;
}
return fileName;
}
catch
{
return fileName;
}
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
private void txtFilePath_MouseEnter(object sender, EventArgs e)
{
tsslable.Text = "输入要加密或解密文本的位置";
}
private void txtFilePath_MouseLeave(object sender, EventArgs e)
{
tsslable.Text = strMain;
}
private void cmbPasswordHelp_MouseEnter(object sender, EventArgs e)
{
tsslable.Text = "可以保留一个密码提示，以防您将来忘记密码";
}
private void cmbPasswordHelp_MouseLeave(object sender, EventArgs e)
{
tsslable.Text = strMain;
}
private void txtKey_MouseEnter(object sender, EventArgs e)
{
tsslable.Text = "在此输入您的密码";
}
private void txtKey_MouseLeave(object sender, EventArgs e)
{
tsslable.Text = strMain;
}
}
}
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