c# 解密微信encryptedData字段

参考链接：https://www.cnblogs.com/jetz/p/6384809.html

我写了一个工具方法，直接照搬链接中的方法，还有一个工具类。

    public class Encrypt

    {

        #region SHA1解密

        /// <summary>

        /// 解密小程序的encryptedData

        /// </summary>

        /// <param name="encryptedData">加密的信息</param>

        /// <param name="sessionKey">key</param>

        /// <param name="iv">加密算法的初始向量</param>

        public static WxPhoneModel DescodeWxSHA1(string encryptedData, string sessionKey, string iv)

        {

            WxPhoneModel model = null;

            var res = AESDecrypt(encryptedData, sessionKey, iv);// {"phoneNumber":"152XXXX9583","purePhoneNumber":"1525XXXX3","countryCode":"86","watermark":{"timestamp":1525829586,"appid":"wx38XXXXXXXX43"}} 

            if (!string.IsNullOrEmpty(res))

            {

                model = JObject.Parse(res).ToObject<WxPhoneModel>();

            }

            return model;

        }

        public static string AESDecrypt(string encryptedData, string sessionKey, string iv)

        {

            try

            {

                //16进制数据转换成byte

                var encryptedDataByte = Convert.FromBase64String(encryptedData);  // strToToHexByte(text);

                var rijndaelCipher = new RijndaelManaged

                {

                    Key = Convert.FromBase64String(sessionKey),

                    IV = Convert.FromBase64String(iv),

                    Mode = CipherMode.CBC,

                    Padding = PaddingMode.PKCS7

                };

                var transform = rijndaelCipher.CreateDecryptor();

                var plainText = transform.TransformFinalBlock(encryptedDataByte, , encryptedDataByte.Length);

                var result = Encoding.Default.GetString(plainText);

                return result;

            }

            catch (Exception ex)

            {

                return null;

            }

        }

        #endregion

    }

    public class WxPhoneModel

    {

        /// <summary>

        /// 用户绑定的手机号（国外手机号会有区号）

        /// </summary>

        public string PhoneNumber { set; get; }

        /// <summary>

        /// 没有区号的手机号

        /// </summary>

        public string PurePhoneNumber { set; get; }

        /// <summary>

        /// 区号

        /// </summary>

        public string CountryCode { set; get; }

        /// <summary>

        /// 水印

        /// </summary>

        public WaterMarkModel WaterMark { set; get; }

    }

    public class WaterMarkModel

    {

        /// <summary>

        /// appid

        /// </summary>

        public string AppId { set; get; }

        /// <summary>

        /// 时间戳

        /// </summary>

        public string TimeStamp { set; get; }

    }