C# Des加密

 public static string EntryString(string desstr)
        {   //与解密保持一致的8位字符
            string sKey = "qwer#@!."; 
            byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);
            byte[] keyIV = keyBytes;
            byte[] inputByteArray = Encoding.UTF8.GetBytes(desstr);
            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
            desProvider.Mode = CipherMode.ECB;
            MemoryStream memStream = new MemoryStream();
            CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);
            crypStream.Write(inputByteArray, 0, inputByteArray.Length);
            crypStream.FlushFinalBlock();
            string text = Convert.ToBase64String(memStream.ToArray());
            return text;

        }
        public static string DESEntry(string str)
        {   //与加密保持一致的8位字符
            string sKey = "qwer#@!.";
            byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);
            byte[] keyIV = keyBytes;
            byte[] inputByteArray = Convert.FromBase64String(str);
            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
            desProvider.Mode = CipherMode.ECB;
            MemoryStream memStream = new MemoryStream();
            CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);
            crypStream.Write(inputByteArray, 0, inputByteArray.Length);
            crypStream.FlushFinalBlock();
            string text = Encoding.Default.GetString(memStream.ToArray());
            return text;
        }