C#非對稱加密解密（DEC加密算法）

今天做一個功能，就是在軟件使用前需要激活，防止被復制使用。最后選擇了對稱加密來做，使用base64加密來做也行，因為只是一個小軟件，沒必要使用安全等級很高的算法，也沒有做代碼混淆和防反編譯。

機器碼使用的是UUID，可以做到唯一標識。

 

 

 加密解密代碼

        const string KEY_64 = "abcdefgh";//密鑰，必須是8位
        const string IV_64 = "abcdefgh";//初始化向量
        public static string Encode(string data)
        {
            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            int i = cryptoProvider.KeySize;
            MemoryStream ms = new MemoryStream();
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

            StreamWriter sw = new StreamWriter(cst);
            sw.Write(data);
            sw.Flush();
            cst.FlushFinalBlock();
            sw.Flush();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
        }

        public static string Decode(string data)
        {
            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

            byte[] byEnc;
            try
            {
                byEnc = Convert.FromBase64String(data);
            }
            catch
            {
                return null;
            }

            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            MemoryStream ms = new MemoryStream(byEnc);
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cst);
            return sr.ReadToEnd();
        }

獲取UUID代碼

            string uuid = null;//通用唯一識別碼
            SelectQuery query = new SelectQuery("select * from Win32_ComputerSystemProduct");
            using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(query))
            {
                foreach (var item in searcher.Get())
                {
                    using (item) uuid = item["UUID"].ToString();
                }
            }