加密 隐藏 EFcore 中的数据库连接字符串

找到一个兄台的博文说明，在我的winform中很方便的使用起来了，记录一下。https://blog.youkuaiyun.com/qq_42799562/article/details/109547823

Context中的数据库明文被放了加密文本：

 protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
 {
     if (!optionsBuilder.IsConfigured)
     {                               
         optionsBuilder.UseSqlServer(DecryptKey("ytThAJe4KL6tB5VZETpR7zb3fma8VoPYy6F0Dv1zTvmS1/RR6fq5+F2FnYiVznY8998taPfbgL/WErMccw="));
     }
 }

用加密和解密MD5码，来处理明文的数据库连接字符串：

private static string Key
        {
            get 
            {
                return @")O[NB]6,YF}+efcaj{+oESb9d8>Z'e9M";
            }
        }





/// <summary>
        /// AESKey加密
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string EncryptKey(string key)
        {
            //获取设置Rijndael算法密钥
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(Key);
            //获取设置加密转换的字节数组
            byte[] encryptArray = UTF8Encoding.UTF8.GetBytes(key);

            //用于安全加密，Rijndael算法。
            RijndaelManaged rDel = new RijndaelManaged();
            //设置Rijndael算法密钥
            rDel.Key = keyArray;
            //设置Rijndael算法操作模式
            rDel.Mode = CipherMode.ECB;
            //设置Rijndael算法填充模式
            rDel.Padding = PaddingMode.PKCS7;

            //创建Rijndael算法加密对象
            ICryptoTransform transform = rDel.CreateEncryptor();
            //转换子节数组
            byte[] resultArray = transform.TransformFinalBlock(encryptArray, 0, encryptArray.Length);

            //返回8位无符号整数数组等效的字符串
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }





        /// <summary>
        /// AESKey解密
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string DecryptKey(string key)
        {
            //获取设置Rijndael算法密钥
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(Key);
            //将加密的字节数组转换8位无符号整数
            byte[] decryptArray = Convert.FromBase64String(key);

            //用于安全加密，Rijndael算法。
            RijndaelManaged rDel = new RijndaelManaged();
            //设置Rijndael算法密钥
            rDel.Key = keyArray;
            //设置Rijndael算法操作模式
            rDel.Mode = CipherMode.ECB;
            //设置Rijndael算法填充模式
            rDel.Padding = PaddingMode.PKCS7;

            //创建Rijndael解密对象
            ICryptoTransform transform = rDel.CreateDecryptor();
            //转换字节数组
            byte[] resultArray = transform.TransformFinalBlock(decryptArray, 0, decryptArray.Length);

            //返回子节转数组字符串
            return UTF8Encoding.UTF8.GetString(resultArray);
        }
    }