DES加密文件

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 /// <summary>        /// 随机产生密钥        /// </summary>        /// <returns></returns>        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);        }                /// <summary>        /// DES加密文件内容(不支持中文)        /// </summary>        /// <param name="sInputFilename">输入文件名</param>        /// <param name="sOutputFilename">输出文件名</param>        /// <param name="sKey">加密密钥8位</param>        public static void EncryptFileByASCII(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();        }        /// <summary>        /// DES解密文件(不支持中文)        /// </summary>        /// <param name="sInputFilename">输入文件名</param>        /// <param name="sOutputFilename">输出文件名</param>        /// <param name="sKey">解密密钥8位</param>        public static void DecryptFileByASCII(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();        }        /// <summary>        /// 对文件内容进行DES加密(支持中文)        /// </summary>        /// <param name="sourceFile">待加密的文件绝对路径</param>        /// <param name="destFile">加密后的文件保存的绝对路径</param>        /// <param name="sKey">加密密钥8位</param>        public static void EncryptFileByUnicode(string sourceFile, string destFile,string sKey)        {            if (!File.Exists(sourceFile))            {                throw new FileNotFoundException("指定的文件路径不存在！", sourceFile);            }            byte[] btKey = Encoding.Default.GetBytes(sKey);            byte[] btIV = Encoding.Default.GetBytes(sKey);            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            byte[] btFile = File.ReadAllBytes(sourceFile);            using (FileStream fs = new FileStream(destFile, FileMode.Create, FileAccess.Write))            {                try                {                    using (CryptoStream cs = new CryptoStream(fs, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))                    {                        cs.Write(btFile, 0, btFile.Length);                        cs.FlushFinalBlock();                    }                }                catch                {                    throw;                }                finally                {                    fs.Close();                }            }        }        /// <summary>        /// 对文件内容进行DES加密，加密后覆盖掉原来的文件(支持中文)        /// </summary>        /// <param name="sourceFile">待加密的文件的绝对路径</param>        /// <param name="sKey">加密密钥8位</param>        public static void EncryptFileByUnicode(string sourceFile, string sKey)        {            EncryptFileByUnicode(sourceFile, sourceFile, sKey);        }        /// <summary>        /// 对文件内容进行DES解密(支持中文)        /// </summary>        /// <param name="sourceFile">待解密的文件绝对路径</param>        /// <param name="destFile">解密后的文件保存的绝对路径</param>        /// <param name="sKey">解密密钥8位</param>        public static void DecryptFileByUnicode(string sourceFile, string destFile, string sKey)        {            if (!File.Exists(sourceFile)) throw new FileNotFoundException("指定的文件路径不存在！", sourceFile);            byte[] btKey = Encoding.Default.GetBytes(sKey);            byte[] btIV = Encoding.Default.GetBytes(sKey);            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            byte[] btFile = File.ReadAllBytes(sourceFile);            using (FileStream fs = new FileStream(destFile, FileMode.Create, FileAccess.Write))            {                try                {                    using (CryptoStream cs = new CryptoStream(fs, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write))                    {                        cs.Write(btFile, 0, btFile.Length);                        cs.FlushFinalBlock();                    }                }                catch                {                    throw;                }                finally                {                    fs.Close();                }            }        }        /// <summary>        /// 对文件内容进行DES解密，加密后覆盖掉原来的文件(支持中文)        /// </summary>        /// <param name="sourceFile">待解密的文件的绝对路径</param>        /// <param name="sKey">解密密钥8位</param>        public static void DecryptFileByUnicode(string sourceFile, string sKey)        {            DecryptFileByUnicode(sourceFile, sourceFile, sKey);        }