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; }
}