C# 对 App.config的appSettings节点数据进行加密

.NET平台下的Winform和Asp.net的配置文件默认都是明文保存的,本文使用的是.Net自身如何加密配置文件,不包含自定义的加密规则

但.Net是提供了直接对配置文件加密的功能的,使用.Net加密的配置节在读取时不需要手动解密.Net会自行解密并返回解密后的数据

加密后的数据会保存到一个单独的配置节点里(不管加密的节点下有多少子项,加密后的数据都在CipherValue 里)

.Net是按照节点来进行加密的,所以如果给像appSettings这样的节点加密

那么该节点下面的所有数据都会加密(单独的Key进行加密可以自己Code实现,不太清楚.Net本身是否能只加密节点下某N个Key)

加密后的数据及节点:

<EncryptedData>
    <CipherData>
      <CipherValue>AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAABbLHX[...]</CipherValue>
    </CipherData>
  </EncryptedData>

using System;
using System.Configuration;
using System.Collections.Generic;
namespace HTL{
    static class Program{
        /// <summary>
        /// 健值集合,用于保存数据到配置文件
        /// </summary>
        static Dictionary<string, string> key_value = new Dictionary<string, string>();
        [STAThread]
        public static void Main(string[] args)
        {
            key_value.Add("encrypt","加密");
            key_value.Add("test","测试");
            
            //加密AppSettings节点
            AddConfig(key_value,true);
            try    {
                Console.WriteLine("加密'test'的数据:"+System.Configuration.ConfigurationManager.AppSettings["test"]);
            }
            catch(Exception e)
            {
                Console.Write("读取AppSettings节点数据失败.错误信息:
"+e.Message );
            }      
            //不加密AppSettings节点,如果不加密在前，加密在后则会出现错误“无法识别的属性“configProtectionProvider”。请注意属性名称区分大小写。”
                        AddConfig(key_value,false);
            try    {
                Console.WriteLine("未加密'test'的数据:"+System.Configuration.ConfigurationManager.AppSettings["test"]);
            }
            catch(Exception e)
            {
                Console.Write("读取AppSettings节点数据失败.错误信息:
"+e.Message );
            }              
            Console.ReadKey();
        }
        /// <summary>
        ///　对appSettings节点添加健值
        ///　如果健已经存在则更改值
        ///　添加后重新保存并刷新该节点
        /// </summary>
        /// <param name="dict">添加的健值集合</param>
        /// <param name="isProtected">是否加密appSettings节点数据,如果为TrueappSettings节点下所有数据都会被加密</param>
        public static void AddConfig(System.Collections.Generic.Dictionary<string, string> dict, bool isProtected)
        {
            if (dict == null || dict.Count <= 0) return;
            System.Configuration.Configuration configuration =System.Configuration.ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            #region  //循环添加或更改健值
            foreach (System.Collections.Generic.KeyValuePair<string, string> key_value in dict)
            {
                if (string.IsNullOrEmpty(key_value.Key)) continue;
                if ( configuration.AppSettings.Settings[key_value.Key]!=null)
                    configuration.AppSettings.Settings[key_value.Key].Value = key_value.Value;
                else
                    configuration.AppSettings.Settings.Add(key_value.Key, key_value.Value);
            }//end foreach
            #endregion
            #region//保存配置文件
            try
            {
                //加密配置信息
                if (isProtected && !configuration.AppSettings.SectionInformation.IsProtected)
                {
                    configuration.AppSettings.SectionInformation.ForceSave = true;
                    configuration.AppSettings.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
                }
                configuration.Save();
            }
            catch (Exception)
            {
                throw;
            }
            ConfigurationManager.RefreshSection("appSettings");   
        ConfigurationManager.RefreshSection("configuration");
           }
       #endregion
        }
}  

using System;
using System.Configuration;
using System.Collections.Generic;
namespace HTL{
    static class Program{
        /// <summary>
        /// 健值集合,用于保存数据到配置文件
        /// </summary>
        static Dictionary<string, string> key_value = new Dictionary<string, string>();
        [STAThread]
        public static void Main(string[] args)
        {
            key_value.Add("encrypt","加密");
            key_value.Add("test","测试");
            
            //加密AppSettings节点
            AddConfig(key_value,true);
            try    {
                Console.WriteLine("加密'test'的数据:"+System.Configuration.ConfigurationManager.AppSettings["test"]);
            }
            catch(Exception e)
            {
                Console.Write("读取AppSettings节点数据失败.错误信息:
"+e.Message );
            }      
            //不加密AppSettings节点,如果不加密在前，加密在后则会出现错误“无法识别的属性“configProtectionProvider”。请注意属性名称区分大小写。”
                        AddConfig(key_value,false);
            try    {
                Console.WriteLine("未加密'test'的数据:"+System.Configuration.ConfigurationManager.AppSettings["test"]);
            }
            catch(Exception e)
            {
                Console.Write("读取AppSettings节点数据失败.错误信息:
"+e.Message );
            }              
            Console.ReadKey();
        }
        /// <summary>
        ///　对appSettings节点添加健值
        ///　如果健已经存在则更改值
        ///　添加后重新保存并刷新该节点
        /// </summary>
        /// <param name="dict">添加的健值集合</param>
        /// <param name="isProtected">是否加密appSettings节点数据,如果为TrueappSettings节点下所有数据都会被加密</param>
        public static void AddConfig(System.Collections.Generic.Dictionary<string, string> dict, bool isProtected)
        {
            if (dict == null || dict.Count <= 0) return;
            System.Configuration.Configuration configuration =System.Configuration.ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            #region  //循环添加或更改健值
            foreach (System.Collections.Generic.KeyValuePair<string, string> key_value in dict)
            {
                if (string.IsNullOrEmpty(key_value.Key)) continue;
                if ( configuration.AppSettings.Settings[key_value.Key]!=null)
                    configuration.AppSettings.Settings[key_value.Key].Value = key_value.Value;
                else
                    configuration.AppSettings.Settings.Add(key_value.Key, key_value.Value);
            }//end foreach
            #endregion
            #region//保存配置文件
            try
            {
                //加密配置信息
                if (isProtected && !configuration.AppSettings.SectionInformation.IsProtected)
                {
                    configuration.AppSettings.SectionInformation.ForceSave = true;
                    configuration.AppSettings.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
                }
                configuration.Save();
            }
            catch (Exception)
            {
                throw;
            }
            ConfigurationManager.RefreshSection("appSettings");   
        ConfigurationManager.RefreshSection("configuration");
           }
       #endregion
        }
}  

AddConfig(key_value,true);//加密AppSettings节点

加密在前,不加密在后

不加密在前,加密在后出错的错误

配置文件加密参考：

http://msdn.microsoft.com/zh-CN/library/ms254494.aspx

http://msdn.microsoft.com/zh-tw/magazine/cc163614.aspx

http://blogs.ppedv.de/felixr/archive/Encrypt-App.settings

http://www.cnblogs.com/lwjun/archive/2009/07/22/1528481.html

http://weblogs.asp.net/jongalloway//encrypting-passwords-in-a-net-app-config-file

 

无法识别的属性 configProtectionProvider参考(都未解决):

http://www.cnblogs.com/colder/p/3274424.html

http://stackoverflow.com/questions/672157/app-config-encrypted-section-error

http://stackoverflow.com/questions/7856951/unrecognized-attribute-configprotectionprovider-after-encrypting-app-config

 

解决无法识别的属性 configProtectionProvider:

http://www.cnblogs.com/huangtailang/p/3940011.html