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;
    
    // 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;
&

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