前面一篇博文中，分享了一個文件夾加密小工具，該工具是操作文件夾名稱的方法實現(xiàn)文件夾的一般加密，文件夾中的文件（視頻、圖片等）都原封不動的保存在那里。

　　DebugLZQ在網(wǎng)上搜索相關(guān)文件加密的程序，發(fā)現(xiàn)給出的基本都是針對“字符創(chuàng)”、“文本”的加密與解密。對視頻文件、圖片等一般文件的加密解密程序少之又少，故寫下此文，實現(xiàn)一個對一般文件進行加密的小工具。

　　程序的主要功能是：用戶通過文件選擇框選擇要加密的文件-》輸入密碼進行加密；選擇加密后的文件，輸入密碼進行解密。

　　程序的主界面如下：

　　三個按鈕的Click事件處理程序如下：

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//刪除加密前的文件 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//刪除解密前的文件 File.Delete(inFile);txtFileName.Text = string.Empty;MessageBox.Show("解密成功");}

　　加密解密的Help文件源碼如下：

using System; using System.Collections.Generic; using System.Text; using System.Security.Cryptography; using System.IO;namespace DESFile {/// <summary>/// 異常處理類/// </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>/// 檢驗兩個Byte數(shù)組是否相同/// </summary>/// <param name="b1">Byte數(shù)組</param>/// <param name="b2">Byte數(shù)組</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>/// 創(chuàng)建DebugLZQ ,http://www.cnblogs.com/DebugLZQ/// </summary>/// <param name="password">密碼</param>/// <param name="salt"></param>/// <returns>加密對象</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>/// 加密文件隨機數(shù)生成/// </summary>private static RandomNumberGenerator rand = new RNGCryptoServiceProvider();/// <summary>/// 生成指定長度的隨機Byte數(shù)組/// </summary>/// <param name="count">Byte數(shù)組長度</param>/// <returns>隨機Byte數(shù)組</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">加密后輸入文件</param>/// <param name="password">加密密碼</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; // 輸入文件長度int size = (int)lSize;byte[] bytes = new byte[BUFFER_SIZE]; // 緩存int read = -1; // 輸入文件讀取數(shù)量int value = 0;// 獲取IV和saltbyte[] IV = GenerateRandomBytes(16);byte[] salt = GenerateRandomBytes(16);// 創(chuàng)建加密對象SymmetricAlgorithm sma = DESFileClass.CreateRijndael(password, salt);sma.IV = IV;// 在輸出文件開始部分寫入IV和saltfout.Write(IV, 0, IV.Length);fout.Write(salt, 0, salt.Length);// 創(chuàng)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);// 讀寫字節(jié)塊到加密流緩沖區(qū)while ((read = fin.Read(bytes, 0, bytes.Length)) != 0){cout.Write(bytes, 0, read);chash.Write(bytes, 0, read);value += read;}// 關(guān)閉加密流 chash.Flush();chash.Close();// 讀取散列byte[] hash = hasher.Hash;// 輸入文件寫入散列cout.Write(hash, 0, hash.Length);// 關(guān)閉文件流 cout.Flush();cout.Close();}}}/// <summary>/// 解密文件/// </summary>/// <param name="inFile">待解密文件</param>/// <param name="outFile">解密后輸出文件</param>/// <param name="password">解密密碼</param>public static void DecryptFile(string inFile, string outFile, string password){// 創(chuàng)建打開文件流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;// 創(chuàng)建散列對象, 校驗文件HashAlgorithm hasher = SHA256.Create();using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read),chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write)){// 讀取文件長度BinaryReader br = new BinaryReader(cin);lSize = br.ReadInt64();ulong tag = br.ReadUInt64();if (FC_TAG != tag)throw new CryptoHelpException("文件被破壞");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;// 獲取比較和舊的散列對象byte[] oldHash = new byte[hasher.HashSize / 8];read = cin.Read(oldHash, 0, oldHash.Length);if ((oldHash.Length != read) || (!CheckByteArrays(oldHash, curHash)))throw new CryptoHelpException("文件被破壞");}if (outValue != lSize)throw new CryptoHelpException("文件大小不匹配");}}} }

?加密/解密結(jié)果：

以加密D盤下的1.avi為例，加密后的文件為1.avi.dat，即使重命名回1.avi文件依然無法打開（文件被加密）。

輸入密碼進行解密后，文件恢復(fù)解密，可以順利打開~

?

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