关于C#下面压缩文件，以及加密文件的问题，大家过来帮帮忙呀。

[asd119cn]

我现在使用 using System.IO.Compression; 下面的方法利用DES+序列来进行文件夹的压缩；
现在我需要把这个压缩的文件加密。但是出现一个问题。如果不加密的话，文件的解压缩是正常的。但是加上加密以后，就会出现问题。
解密以后的文件，也加密之前的文件不同。所以无法解压缩了。不知道大家有没有碰到这样的事情。
1.压缩文件：5K
2.加密文件：5k
3.解密后的文件：10K
上面是操作时的文件大小变化，最后解密以后文件变大了。而且中文变成乱码了。要怎么解决？

下面附上几个相关文件代码：

[asd119cn]

我就是先压缩再加密的； 我觉得是加密中文的时候发生了问题；

[chang110cn]

如果觉得是中文的问题,转换成Unicode,再加密.
注意一下字符的编码.

[277894613]

我产品代码的反汇编

public static class ZipCrypto
{
    // Fields
    private static byte[] cryptoIV = new byte[] { 2, 3, 1, 2, 0, 2, 3, 4 };
    private static byte[] cryptoKey = new byte[] { 2, 0, 0, 7, 1, 1, 0, 2 };
    private static DESCryptoServiceProvider des = new DESCryptoServiceProvider();
    private static Encoding encoding = Encoding.UTF8;

    // Methods
    private static ICryptoTransform CreateICryptoTransform(CryptoStreamMode mode)
    {
        if (mode == CryptoStreamMode.Read)
        {
            return des.CreateDecryptor(cryptoKey, cryptoIV);
        }
        return des.CreateEncryptor(cryptoKey, cryptoIV);
    }

    public static string Read(string filename)
    {
        StreamReader reader = null;
        string CS$1$0000;
        try
        {
            FileStream file = new FileStream(filename, FileMode.Open, FileAccess.Read);
            CryptoStream crypto = new CryptoStream(file, CreateICryptoTransform(CryptoStreamMode.Read), CryptoStreamMode.Read);
            DeflateStream zip = new DeflateStream(crypto, CompressionMode.Decompress);
            reader = new StreamReader(zip, encoding);
            CS$1$0000 = reader.ReadToEnd();
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            if (reader != null)
            {
                reader.Close();
            }
        }
        return CS$1$0000;
    }

    public static void Write(string filename, string data)
    {
        StreamWriter writer = null;
        try
        {
            FileStream file = new FileStream(filename, FileMode.Create, FileAccess.Write);
            CryptoStream crypto = new CryptoStream(file, CreateICryptoTransform(CryptoStreamMode.Write), CryptoStreamMode.Write);
            DeflateStream zip = new DeflateStream(crypto, CompressionMode.Compress);
            writer = new StreamWriter(zip, encoding);
            writer.Write(data);
            writer.Close();
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            if (writer != null)
            {
                writer.Close();
            }
        }
    }
}

[asd119cn]

zip.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Runtime.InteropServices;

public partial class export_zip : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string path = Server.MapPath("export");
        path = path.Substring(0,path.Length-6);
        Gzip.Compress(path, path + "\\test.a_");

        string key = FileEncryptDecrypt.GenerateKey();
        StreamWriter myWriter = new StreamWriter(path + "\\key.txt");
        myWriter.WriteLine(key);
        myWriter.Close();
        GCHandle gch = GCHandle.Alloc(key, GCHandleType.Pinned);
        FileEncryptDecrypt.EncryptFile(path + "\\test.a_", path + "\\aa.aa", key);
        FileEncryptDecrypt.ZeroMemory(gch.AddrOfPinnedObject(), key.Length*2);
        gch.Free();

        StreamReader myreader = new StreamReader(path + "\\key.txt");
        string newKey = myreader.ReadLine();
        myreader.Close();

        GCHandle gch2 = GCHandle.Alloc(newKey, GCHandleType.Pinned);
        FileEncryptDecrypt.DecryptFile(path + "\\aa.aa", path + "\\bb.a_", newKey);
        FileEncryptDecrypt.ZeroMemory(gch2.AddrOfPinnedObject(), newKey.Length * 2);
        gch2.Free();

        if (key == newKey)
        {
            string abc = "";
        }

        Gzip.DeCompress(path+"\\bb.a_",path + "\\kk\\");
    }
}

[我不懂电脑]

也可以先压缩，再加密。

[asd119cn]

FileEncryptDecrypt.cs

using System;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Runtime.InteropServices;
using System.Text;

/// <summary>
/// FileEncryptDecrypt 的摘要说明
/// </summary>
public class FileEncryptDecrypt
{
    public FileEncryptDecrypt()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    //  Call this function to remove the key from memory after use for security
    [System.Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
    public static extern bool ZeroMemory(IntPtr Destination, int Length);

    // Function to Generate a 64 bits Key.
    public static string GenerateKey()
    {
        // Create an instance of Symetric Algorithm. Key and IV is generated automatically.
        DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();

        // Use the Automatically generated key for Encryption. 
        return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
    }

    public static void EncryptFile(string sInputFilename,string sOutputFilename,string sKey)
    {
        FileStream fsInput = new FileStream(sInputFilename,FileMode.Open,FileAccess.Read);

        FileStream fsEncrypted = new FileStream(sOutputFilename,FileMode.Create,FileAccess.Write);
        DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
        DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
        DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
        ICryptoTransform desencrypt = DES.CreateEncryptor();
        CryptoStream cryptostream = new CryptoStream(fsEncrypted,desencrypt,CryptoStreamMode.Write);

        byte[] bytearrayinput = new byte[fsInput.Length];
        fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
        cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
        cryptostream.Close();
        fsInput.Close();
        fsEncrypted.Close();
    }

    public static void DecryptFile(string sInputFilename,string sOutputFilename,string sKey)
    {
        DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
        //A 64 bit key and IV is required for this provider.
        //Set secret key For DES algorithm.
        DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
        //Set initialization vector.
        DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

        //Create a file stream to read the encrypted file back.
        FileStream fsread = new FileStream(sInputFilename,FileMode.Open,FileAccess.Read);
        //Create a DES decryptor from the DES instance.
        ICryptoTransform desdecrypt = DES.CreateDecryptor();
        //Create crypto stream set to read and do a 
        //DES decryption transform on incoming bytes.
        CryptoStream cryptostreamDecr = new CryptoStream(fsread,desdecrypt,CryptoStreamMode.Read);
        //Print the contents of the decrypted file.
        StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
        fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
        fsDecrypted.Flush();
        fsDecrypted.Close();
    }

    static void Main()
    {
        // Must be 64 bits, 8 bytes.
        // Distribute this key to the user who will decrypt this file.
        string sSecretKey;

        // Get the Key for the file to Encrypt.
        sSecretKey = GenerateKey();

        // For additional security Pin the key.
        GCHandle gch = GCHandle.Alloc(sSecretKey, GCHandleType.Pinned);

        // Encrypt the file.        
        EncryptFile(@"C:\MyData.txt",
           @"C:\Encrypted.txt",
           sSecretKey);

        // Decrypt the file.
        DecryptFile(@"C:\Encrypted.txt",
           @"C:\Decrypted.txt",
           sSecretKey);

        // Remove the Key from memory. 
        ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2);
        gch.Free();
    }

}

Gzip.cs

using System;
using System.Text;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Collections;
using System.IO;
using System.IO.Compression;

/// <summary>
/// Gzip 的摘要说明
/// </summary>
public class Gzip
{
    public Gzip()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    /// <summary>
    /// 对目标文件夹进行压缩，将压缩结果保存为指定文件
    /// </summary>
    /// <param name="dirPath">目标文件夹</param>
    /// <param name="fileName">压缩文件</param>
    public static void Compress(string dirPath, string fileName)
    {
        ArrayList list = new ArrayList();
        foreach (string f in Directory.GetFiles(dirPath))
        {
            byte[] destBuffer = File.ReadAllBytes(f);
            SerializeFileInfo sfi = new SerializeFileInfo(f, destBuffer);
            list.Add(sfi);
        }
        IFormatter formatter = new BinaryFormatter();
        using (Stream s = new MemoryStream())
        {
            formatter.Serialize(s, list);
            s.Position = 0;
            CreateCompressFile(s, fileName);
        }
    }

    /**/
    /// <summary>
    /// 对目标压缩文件解压缩，将内容解压缩到指定文件夹
    /// </summary>
    /// <param name="fileName">压缩文件</param>
    /// <param name="dirPath">解压缩目录</param>
    public static void DeCompress(string fileName, string dirPath)
    {
        using (Stream source = File.OpenRead(fileName))
        {
            using (Stream destination = new MemoryStream())
            {
                using (GZipStream input = new GZipStream(source, CompressionMode.Decompress, true))
                {
                    byte[] bytes = new byte[4096];
                    int n;
                    while ((n = input.Read(bytes, 0, bytes.Length)) != 0)
                    {
                        destination.Write(bytes, 0, n);
                    }
                }
                destination.Flush();
                destination.Position = 0;
                DeSerializeFiles(destination, dirPath);
            }
        }
    }

    private static void DeSerializeFiles(Stream s, string dirPath)
    {
        BinaryFormatter b = new BinaryFormatter();
        ArrayList list = (ArrayList)b.Deserialize(s);

        foreach (SerializeFileInfo f in list)
        {
            string newName = dirPath + Path.GetFileName(f.FileName);
            using (FileStream fs = new FileStream(newName, FileMode.Create, FileAccess.Write))
            {
                fs.Write(f.FileBuffer, 0, f.FileBuffer.Length);
                fs.Close();
            }
        }
    }

    private static void CreateCompressFile(Stream source, string destinationName)
    {
        using (Stream destination = new FileStream(destinationName, FileMode.Create, FileAccess.Write))
        {
            using (GZipStream output = new GZipStream(destination, CompressionMode.Compress))
            {
                byte[] bytes = new byte[4096];
                int n;
                while ((n = source.Read(bytes, 0, bytes.Length)) != 0)
                {
                    output.Write(bytes, 0, n);
                }
            }
        }
    }

    [Serializable]
    class SerializeFileInfo
    {
        public SerializeFileInfo(string name, byte[] buffer)
        {
            fileName = name;
            fileBuffer = buffer;
        }

        string fileName;
        public string FileName
        {
            get
            {
                return fileName;
            }
        }

        byte[] fileBuffer;
        public byte[] FileBuffer
        {
            get
            {
                return fileBuffer;
            }
        }
    }

}

[asd119cn]

换了一个写法就搞定了，和文件的编码没关系的。
有时间看看6楼的写法