C#如何对文件夹加密和解密

[xwh0318]

C#如何对文件夹加密和解密

[Ador3]

一些简单的加解密

public static void Encrypt(string pathIn, string pathOut, string password)
        {
            try
            {
                byte[] iv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                byte[] key = System.Text.Encoding.UTF8.GetBytes(password);
                System.IO.FileStream fs = new FileStream(pathIn, FileMode.Open, FileAccess.Read);
                System.IO.FileStream outfs = new FileStream(pathOut, FileMode.OpenOrCreate, FileAccess.Write);
                outfs.SetLength(0);
                byte[] myBytes = new byte[100];
                long myInLength = 0;
                long myLength = fs.Length;
                System.Security.Cryptography.DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
                System.Security.Cryptography.CryptoStream cs = new CryptoStream(outfs, dsp.CreateEncryptor(key, iv), CryptoStreamMode.Write);
                while (myInLength < myLength)
                {
                    int myLen = fs.Read(myBytes, 0, 100);
                    cs.Write(myBytes, 0, myLen);
                    myInLength += myLen;
                }
                cs.Close();
                fs.Close();
                outfs.Close();
            }
            catch (IOException ioex)
            {
                Log.debug("Encrypt(pathIn, pathOut, password): " + ioex.Message + "\r\nSource:" + ioex.Source + "\r\nStackTrace:" + ioex.StackTrace);
            }
        }

        public static void Decrypt(string pathIn, string pathOut, string password)
        {
            try
            {
                System.IO.FileStream fs = new FileStream(pathIn, FileMode.Open, FileAccess.Read);
                System.IO.FileStream outfs = new FileStream(pathOut, FileMode.OpenOrCreate, FileAccess.Write);
                outfs.SetLength(0);
                long myLength = fs.Length;
                long myInLength = 0;
                byte[] iv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                byte[] key = System.Text.Encoding.UTF8.GetBytes(password);
                System.Security.Cryptography.DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
                System.Security.Cryptography.CryptoStream cs = new CryptoStream(outfs, dsp.CreateDecryptor(key, iv), CryptoStreamMode.Write);
                byte[] myBytes = new byte[100];
                while (myInLength < myLength)
                {
                    int myLen = fs.Read(myBytes, 0, 100);
                    cs.Write(myBytes, 0, myLen);
                    myInLength += myLen;
                }
                cs.Close();
                fs.Close();
                outfs.Close();
            }
            catch (IOException ioex)
            {
                Log.debug("Dncrypt(pathIn, pathOut, password): " + ioex.Message + "\r\nSource:" + ioex.Source + "\r\nStackTrace:" + ioex.StackTrace);
            }
        }

        public static string EncryptBy16MD5(string strProclaimed)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            string strCryptograph = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(strProclaimed)), 4, 8);
            return strCryptograph;
        }

        /// <summary>
        /// md5 32位加密
        /// </summary>
        /// <param name="strProclaimed">明文</param>
        /// <returns>密文</returns>
        public static string EncryptBy32MD5(string strProclaimed)
        {
            MD5 md5 = MD5.Create();
            string strCryptograph = "";
            byte[] bytCode = md5.ComputeHash(Encoding.UTF8.GetBytes(strProclaimed));
            for (int i = 0; i < bytCode.Length; i++)
            {
                // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符 
                strCryptograph = strCryptograph + bytCode[i].ToString("x");
            }
            return strCryptograph;
        }

[A-雷子]

学习地

[zcdg909]

这样调用：Encrypt(@"D:\dpp\cx", @"D:\dpp\pp", "123");
但出现错误：
对路径“D:\dpp\cx”的访问被拒绝。

错误在语句：
System.IO.FileStream fs = new FileStream(pathIn, FileMode.Open, FileAccess.Read);

[JonesVale]

这些加密都是无法得到想要的解密，当在同一个个位置不发生改变的时候就可以解密，加密如果与解密在不同点，就不能解密了，即使保存了加密的KEY与IV再下次的时候使用同样的KEY与IV也无法完成解密动作。也就是说这些都是不是我们想要的加密与解密。

[MoonDrunkLotus]

这个加密与解密在同一个应用程序没问题，若把文件上传到服务器上时加密，下载到客户端解密就不行了！大侠们有没有解决办法！

[chenhong108]

我也想知道.

[w450534843]

学习~

[jpvyiu]

顶一个

[mycjzlove]

学习下啊。。。。

[slang98]

闲逛来学习下

[a7920]

闲逛来学习下

[cquwtz]

看不到啊