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Windows中使用C#为文件夹和文件编写密码锁的示例分享

2020-01-24 01:14:51
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C#文件夹加锁小工具
用C#语言实现一个文件夹锁的程序,网上类似的“xxx文件夹xxx”软件很多,但是基本上都是C/C++语言实现的,且都没有提供源码(这个可以理解,毕竟是加密程序,不应该泄露源码)。

程序的基本原理是:用C#语言重命名文件夹,通过重命名使之成为windows安全文件的类标识符。具体的方法是为文件夹添加拓展名“.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}”

(.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}是windows安全文件的类标识符),这时文件夹的图标就会变成一把锁,这样文件夹就被加锁了。

程序的主界面非常简洁,截图如下:

201637142947291.png (437×167)

程序中加密解密文件夹的核心代码如下:

    private void btnBrowseFolder_Click(object sender, EventArgs e)    {            status = lockType;//            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)      {        DirectoryInfo d = new DirectoryInfo(folderBrowserDialog1.SelectedPath);        string selectedpath = d.Parent.FullName + d.Name;        if (folderBrowserDialog1.SelectedPath.LastIndexOf(".{") == -1)//通过文件夹名称,判断加密        {                    SetPwd(folderBrowserDialog1.SelectedPath);          if (!d.Root.Equals(d.Parent.FullName))          {                          d.MoveTo(d.Parent.FullName + "//" + d.Name + status);//文件夹重命名          }          else d.MoveTo(d.Parent.FullName + d.Name + status);          txtFolderPath.Text = folderBrowserDialog1.SelectedPath;                  }        else//解密文件夹        {          status = GetStatus(status);          bool s = CheckPwd();          if (s)          {            File.Delete(folderBrowserDialog1.SelectedPath + "//key.xml");            string path = folderBrowserDialog1.SelectedPath.Substring(0, folderBrowserDialog1.SelectedPath.LastIndexOf("."));            d.MoveTo(path);            txtFolderPath.Text = path;                      }        }      }    }

程序的运行效果如下:

以加密D盘下面的test文件夹为例,结果如下:

首先通过folderBrowserDialog选择相应的文件夹

201637143219500.png (338×324)

输入密码,加锁

201637143238232.png (290×179)

效果如下:

201637143302754.png (476×290)

此时双击文件夹已经无法打开。

选择加密后的test文件夹,输入加密时输入的密码,可解锁。

201637143409234.png (290×139)

test文件夹已经解密

201637143435509.png (468×204)

加密解密文件小工具

上面分享了一个文件夹加密小工具,该工具是操作文件夹名称的方法实现文件夹的一般加密,文件夹中的文件(视频、图片等)都原封不动的保存在那里。

在网上搜索相关文件加密的程序,发现给出的基本都是针对“字符创”、“文本”的加密与解密。对视频文件、图片等一般文件的加密解密程序少之又少,所以我们下面再来实现一个对一般文件进行加密的小工具。

程序的主要功能是:用户通过文件选择框选择要加密的文件-》输入密码进行加密;选择加密后的文件,输入密码进行解密。

程序的主界面如下:

201637143452275.png (458×181)

三个按钮的Click事件处理程序如下:

    private void btnSelectFile_Click(object sender, EventArgs e)    {      if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)      {        txtFileName.Text = openFileDialog1.FileName ;      }    }    private void btnEncryptFile_Click(object sender, EventArgs e)    {      string inFile=txtFileName.Text;      string outFile = inFile + ".dat";      string password=txtPassword.Text ;      DESFile.DESFileClass.EncryptFile(inFile, outFile, password);//加密文件      //删除加密前的文件      File.Delete(inFile);      txtFileName.Text = string.Empty;      MessageBox.Show("加密成功");    }    private void btnDecryptFile_Click(object sender, EventArgs e)    {      string inFile = txtFileName.Text;      string outFile = inFile.Substring(0,inFile.Length - 4);      string password = txtPassword.Text;      DESFile.DESFileClass.DecryptFile (inFile, outFile, password);//解密文件      //删除解密前的文件      File.Delete(inFile);      txtFileName.Text = string.Empty;      MessageBox.Show("解密成功");    }加密解密的Help文件源码如下:using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO;namespace DESFile{  /// <summary>  /// 异常处理类  /// </summary>  public class CryptoHelpException : ApplicationException  {    public CryptoHelpException(string msg) : base(msg) { }  }  /// <summary>  /// CryptHelp  /// </summary>  public class DESFileClass  {    private const ulong FC_TAG = 0xFC010203040506CF;    private const int BUFFER_SIZE = 128 * 1024;    /// <summary>    /// 检验两个Byte数组是否相同    /// </summary>    /// <param name="b1">Byte数组</param>    /// <param name="b2">Byte数组</param>    /// <returns>true-相等</returns>    private static bool CheckByteArrays(byte[] b1, byte[] b2)    {      if (b1.Length == b2.Length)      {        for (int i = 0; i < b1.Length; ++i)        {          if (b1[i] != b2[i])            return false;        }        return true;      }      return false;    }    /// <summary>    /// 创建DebugLZQ ,http://www.cnblogs.com/DebugLZQ    /// </summary>    /// <param name="password">密码</param>    /// <param name="salt"></param>    /// <returns>加密对象</returns>    private static SymmetricAlgorithm CreateRijndael(string password, byte[] salt)    {      PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, salt, "SHA256", 1000);      SymmetricAlgorithm sma = Rijndael.Create();      sma.KeySize = 256;      sma.Key = pdb.GetBytes(32);      sma.Padding = PaddingMode.PKCS7;      return sma;    }    /// <summary>    /// 加密文件随机数生成    /// </summary>    private static RandomNumberGenerator rand = new RNGCryptoServiceProvider();    /// <summary>    /// 生成指定长度的随机Byte数组    /// </summary>    /// <param name="count">Byte数组长度</param>    /// <returns>随机Byte数组</returns>    private static byte[] GenerateRandomBytes(int count)    {      byte[] bytes = new byte[count];      rand.GetBytes(bytes);      return bytes;    }    /// <summary>    /// 加密文件    /// </summary>    /// <param name="inFile">待加密文件</param>    /// <param name="outFile">加密后输入文件</param>    /// <param name="password">加密密码</param>    public static void EncryptFile(string inFile, string outFile, string password)    {      using (FileStream fin = File.OpenRead(inFile),        fout = File.OpenWrite(outFile))      {        long lSize = fin.Length; // 输入文件长度        int size = (int)lSize;        byte[] bytes = new byte[BUFFER_SIZE]; // 缓存        int read = -1; // 输入文件读取数量        int value = 0;        // 获取IV和salt        byte[] IV = GenerateRandomBytes(16);        byte[] salt = GenerateRandomBytes(16);        // 创建加密对象        SymmetricAlgorithm sma = DESFileClass.CreateRijndael(password, salt);        sma.IV = IV;        // 在输出文件开始部分写入IV和salt        fout.Write(IV, 0, IV.Length);        fout.Write(salt, 0, salt.Length);        // 创建散列加密        HashAlgorithm hasher = SHA256.Create();        using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write),          chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))        {          BinaryWriter bw = new BinaryWriter(cout);          bw.Write(lSize);          bw.Write(FC_TAG);          // 读写字节块到加密流缓冲区          while ((read = fin.Read(bytes, 0, bytes.Length)) != 0)          {            cout.Write(bytes, 0, read);            chash.Write(bytes, 0, read);            value += read;          }          // 关闭加密流          chash.Flush();          chash.Close();          // 读取散列          byte[] hash = hasher.Hash;          // 输入文件写入散列          cout.Write(hash, 0, hash.Length);          // 关闭文件流          cout.Flush();          cout.Close();        }      }    }    /// <summary>    /// 解密文件    /// </summary>    /// <param name="inFile">待解密文件</param>    /// <param name="outFile">解密后输出文件</param>    /// <param name="password">解密密码</param>    public static void DecryptFile(string inFile, string outFile, string password)    {      // 创建打开文件流      using (FileStream fin = File.OpenRead(inFile),        fout = File.OpenWrite(outFile))      {        int size = (int)fin.Length;        byte[] bytes = new byte[BUFFER_SIZE];        int read = -1;        int value = 0;        int outValue = 0;        byte[] IV = new byte[16];        fin.Read(IV, 0, 16);        byte[] salt = new byte[16];        fin.Read(salt, 0, 16);        SymmetricAlgorithm sma = DESFileClass.CreateRijndael(password, salt);        sma.IV = IV;        value = 32;        long lSize = -1;        // 创建散列对象, 校验文件        HashAlgorithm hasher = SHA256.Create();        using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read),          chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))        {          // 读取文件长度          BinaryReader br = new BinaryReader(cin);          lSize = br.ReadInt64();          ulong tag = br.ReadUInt64();          if (FC_TAG != tag)            throw new CryptoHelpException("文件被破坏");          long numReads = lSize / BUFFER_SIZE;          long slack = (long)lSize % BUFFER_SIZE;          for (int i = 0; i < numReads; ++i)          {            read = cin.Read(bytes, 0, bytes.Length);            fout.Write(bytes, 0, read);            chash.Write(bytes, 0, read);            value += read;            outValue += read;          }          if (slack > 0)          {            read = cin.Read(bytes, 0, (int)slack);            fout.Write(bytes, 0, read);            chash.Write(bytes, 0, read);            value += read;            outValue += read;          }          chash.Flush();          chash.Close();          fout.Flush();          fout.Close();          byte[] curHash = hasher.Hash;          // 获取比较和旧的散列对象          byte[] oldHash = new byte[hasher.HashSize / 8];          read = cin.Read(oldHash, 0, oldHash.Length);          if ((oldHash.Length != read) || (!CheckByteArrays(oldHash, curHash)))            throw new CryptoHelpException("文件被破坏");        }        if (outValue != lSize)          throw new CryptoHelpException("文件大小不匹配");      }    }  }}

加密/解密结果:

以加密D盘下的1.avi为例,加密后的文件为1.avi.dat,即使重命名回1.avi文件依然无法打开(文件被加密)。

201637143519084.jpg (523×437)

输入密码进行解密后,文件恢复解密,可以顺利打开~

201637143537795.jpg (741×468)

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