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      C#.NET下對二進制文件進行加密解密
      發布者:西安軟件公司   發布時間:2012/9/4   閱讀:16次

      下面的類實現了文件的加密和解密操作,試驗了幾種文件類型均沒有問題。

      namespace MyCryptoHelp
      {
      /// <summary>
      /// 異常處理類
      /// </summary>
      public class CryptoHelpException : ApplicationException
      {
      public CryptoHelpException(string msg):base(msg){}
      }

      /// <summary>
      /// CryptHelp
      /// </summary>
      public class CryptoHelp
      {
      private const ulong FC_TAG = 0xFC010203040506CF;

      private const int BUFFER_SIZE = 128*1024;

      /// <summary>
      /// 檢驗兩個Byte數組是否相同
      /// </summary>
      /// <param name="b1">Byte數組</param>
      /// <param name="b2">Byte數組</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>
      /// 創建Rijndael SymmetricAlgorithm
      /// </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>
      /// 加密文件隨機數生成
      /// </summary>
      private static RandomNumberGenerator rand = new RNGCryptoServiceProvider();

      /// <summary>
      /// 生成指定長度的隨機Byte數組
      /// </summary>
      /// <param name="count">Byte數組長度</param>
      /// <returns>隨機Byte數組</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; // 輸入文件讀取數量
      int value = 0;

      // 獲取IV和salt
      byte[] IV = GenerateRandomBytes(16);
      byte[] salt = GenerateRandomBytes(16);

      // 創建加密對象
      SymmetricAlgorithm sma = CryptoHelp.CreateRijndael(password, salt);
      sma.IV = IV;

      // 在輸出文件開始部分寫入IV和salt
      fout.Write(IV,0,IV.Length);
      fout.Write(salt,0,salt.Length);

      // 創建散列加密
      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);

      // 讀寫字節塊到加密流緩沖區
      while( (read = fin.Read(bytes,0,bytes.Length)) != 0 )
      {
      cout.Write(bytes,0,read);
      chash.Write(bytes,0,read);
      value += read;
      }
      // 關閉加密流
      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 = CryptoHelp.CreateRijndael(password,salt);
      sma.IV = IV;

      value = 32;
      long lSize = -1;

      // 創建散列對象, 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");
      }
      }
      }
      }

      // 調用

      public class TestClass
      {
      string myPassword = "TEST_PASSWORD_~!@#";
      string myPlainFile = "test.txt";
      string myEncryptedFile = "test.encrypted";
      string myDecryptedFile = "test.decrypted";

      [STAThread]
      static void Main()
      {
      CryptoHelp.EncryptFile(myPlainFile, myEncryptedFile, myPassword);
      CryptoHelp.DecryptFile(myEncryptedFile,myDecryptedFile, myPassword);
      }
      }

      // 微軟的加密解密文本文件的方法


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