文件压缩加密解密解压问题

[aotian16]

lz新手,
写了个程序用来文件压缩加密解密解压,

流程:

file <-> compress file <-> secret file

问题是在运行中会生成俩个中间文件,
一个是压缩后的中间文件,
一个是解密后的中间文件

请问如果我不想生成中间文件,而是使用内存的话要如何实现?

我用memorystream试过貌似一直不行

以下是我的代码
使用了SharpZipLib

using System;
using System.Collections.Generic;
using System.Text;

using ICSharpCode.SharpZipLib.Zip;
using System.IO;
using System.Security.Cryptography;

namespace Compress2
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 3)
            {
                Console.WriteLine("args < 3");
                return;
            }

            RijndaelManaged rij = new RijndaelManaged();
            rij.KeySize = 128;

            string fp = args[0];
            string sPhysicalFilePath = args[1];
            string fw = args[2];
            Console.WriteLine("Encrypting begin...");

            compressFile(args[0], args[0] + ".zip");
            encryption(rij, args[0] + ".zip", args[0] + ".zip.jiami");
            decryption(rij, args[0] + ".zip.jiami", args[0] + ".zip.jiemi");
            decompressFile(args[0] + ".zip.jiemi", "tmp");
        }

        private static void compressFile(string inputFileName, string outPutFileName)
        {
            FileStream compressFileStream = File.Create(outPutFileName);
            ZipOutputStream zipOpStream = new ZipOutputStream(compressFileStream);

            ZipEntry entry = new ZipEntry(inputFileName);
            zipOpStream.PutNextEntry(entry);

            FileStream fs = File.OpenRead(inputFileName);
            int bytes = 0;
            byte[] buffer = new byte[4096];
            do
            {
                bytes = fs.Read(buffer, 0, buffer.Length);
                zipOpStream.Write(buffer, 0, bytes);
            } while (bytes > 0);

            fs.Close();
            zipOpStream.Close();
        }

        private static void decompressFile(string inputFileName, string outPutDirName)
        {
            ZipInputStream zipIpStream = new ZipInputStream(File.OpenRead(inputFileName));

            ZipEntry theEntry = null;
            while ((theEntry = zipIpStream.GetNextEntry()) != null)
            {
                string directoryName = Path.GetDirectoryName(theEntry.Name);
                string fileName = Path.GetFileName(theEntry.Name);
                //if (directoryName != string.Empty)
                //{
                Directory.CreateDirectory(outPutDirName + "\\" + directoryName);
                //}

                if (fileName != string.Empty)
                {
                    FileStream fs = File.Create(outPutDirName + "\\" + theEntry.Name);

                    int bytes = 0;
                    byte[] buffer = new byte[2048];
                    while (true)
                    {
                        bytes = zipIpStream.Read(buffer, 0, buffer.Length);
                        if (bytes == 0)
                        {
                            break;

                        }
                        fs.Write(buffer, 0, bytes);
                    }
                }
            }
        }

        //用于加密的函数
        public static void encryption(RijndaelManaged rij, string readfile, string writefile)
        {
            try
            {
                byte[] key = rij.Key;
                byte[] iv = rij.IV;
                byte[] buffer = new byte[4096];
                Rijndael crypt = Rijndael.Create();
                ICryptoTransform transform = crypt.CreateEncryptor(key, iv);
                //写进文件
                FileStream fswrite = new FileStream(writefile, FileMode.Create);
                CryptoStream cs = new CryptoStream(fswrite, transform, CryptoStreamMode.Write);
                //打开文件
                FileStream fsread = new FileStream(readfile, FileMode.Open);
                Console.WriteLine("fsread.Length=" + fsread.Length);
                int length;
                //while ((length = fsread.ReadByte()) != -1)
                //cs.WriteByte((byte)length);
                while ((length = fsread.Read(buffer, 0, 4096)) > 0)
                    cs.Write(buffer, 0, (int)length);

                fsread.Close();
                cs.Close();
                fswrite.Close();
                Console.WriteLine("Encrypt Success");
            }
            catch (Exception e)
            {
                Console.WriteLine("Encrypt Faile" + e.ToString());
            }
        }
        //用于解密的函数
        public static void decryption(RijndaelManaged rij, string readfile, string writefile)
        {
            try
            {
                byte[] key = rij.Key;
                byte[] iv = rij.IV;
                byte[] buffer = new byte[4096];
                Rijndael crypt = Rijndael.Create();
                ICryptoTransform transform = crypt.CreateDecryptor(key, iv);
                //读取加密后的文件 
                FileStream fsopen = new FileStream(readfile, FileMode.Open);
                CryptoStream cs = new CryptoStream(fsopen, transform, CryptoStreamMode.Read);
                //把解密后的结果写进文件
                FileStream fswrite = new FileStream(writefile, FileMode.OpenOrCreate);

                int length;
                //while ((length = cs.ReadByte()) != -1)
                //fswrite.WriteByte((byte)length);
                while ((length = cs.Read(buffer, 0, 4096)) > 0)
                    fswrite.Write(buffer, 0, (int)length);
                fswrite.Close();
                cs.Close();
                fsopen.Close();
                Console.WriteLine("Decrypt Success");
            }
            catch (Exception e)
            {
                Console.WriteLine("Decrypt Failed" + e.ToString());
            }
        }
    }
}

[gomoku]

SharpZipLib本身就支持加密(比如256bit AES)，何必多此一举。

[aotian16]

引用 1 楼 gomoku 的回复:

SharpZipLib本身就支持加密(比如256bit AES)，何必多此一举。

是吗,多谢指教 我再研究研究 我刚学c#的,2天

[aotian16]

刚试了下,果然可以 多谢ls 贴上代码

using System;
using System.Collections.Generic;
using System.Text;

using ICSharpCode.SharpZipLib.Zip;
using System.IO;
using System.Security.Cryptography;

namespace Compress3
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 3)
            {
                Console.WriteLine("args < 3");
                return;
            }

            RijndaelManaged rij = new RijndaelManaged();
            rij.KeySize = 128;

            string fp = args[0];
            string sPhysicalFilePath = args[1];
            string fw = args[2];
            Console.WriteLine("Encrypting begin...");

            compressFile(args[0], args[0] + ".zip");
            decompressFile(args[0] + ".zip", "tmp");
        }

        private static void compressFile(string inputFileName, string outPutFileName)
        {
            FileStream compressFileStream = File.Create(outPutFileName);
            ZipOutputStream zipOpStream = new ZipOutputStream(compressFileStream);

            zipOpStream.SetLevel(6);
            zipOpStream.Password = encryptPassword("pass");

            ZipEntry entry = new ZipEntry(inputFileName);
            zipOpStream.PutNextEntry(entry);

            FileStream fs = File.OpenRead(inputFileName);
            int bytes = 0;
            byte[] buffer = new byte[4096];
            do
            {
                bytes = fs.Read(buffer, 0, buffer.Length);
                zipOpStream.Write(buffer, 0, bytes);
            } while (bytes > 0);

            fs.Close();
            zipOpStream.Close();
        }

        private static void decompressFile(string inputFileName, string outPutDirName)
        {
            ZipInputStream zipIpStream = new ZipInputStream(File.OpenRead(inputFileName));
            zipIpStream.Password = encryptPassword("pass");

            ZipEntry theEntry = null;
            while ((theEntry = zipIpStream.GetNextEntry()) != null)
            {
                string directoryName = Path.GetDirectoryName(theEntry.Name);
                string fileName = Path.GetFileName(theEntry.Name);
                //if (directoryName != string.Empty)
                //{
                Directory.CreateDirectory(outPutDirName + "\\" + directoryName);
                //}

                if (fileName != string.Empty)
                {
                    FileStream fs = File.Create(outPutDirName + "\\" + theEntry.Name);

                    int bytes = 0;
                    byte[] buffer = new byte[2048];
                    while (true)
                    {
                        bytes = zipIpStream.Read(buffer, 0, buffer.Length);
                        if (bytes == 0)
                        {
                            break;

                        }
                        fs.Write(buffer, 0, bytes);
                    }
                }
            }
        }

        public static string encryptPassword(string password)
        {
            string cl = password;
            string pwd = "";
            MD5 md5 = MD5.Create();
            byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));
            for (int i = 0; i < s.Length; i++)
            {
                pwd = pwd + s[i].ToString("X");
            }
            return pwd;
        }
    }
}