微信数据解密算法

   		/// 

        /// 解密微信信息 
        /// 
        /// 解密字符串
        /// 
        /// 
        /// 
        public static string AES_decrypt(string encryptedDataStr, string key, string iv)
        {
            RijndaelManaged rijalg = new RijndaelManaged();
            //设置 cipher 格式 AES-128-CBC 
            rijalg.KeySize = 128;
            rijalg.Padding = PaddingMode.PKCS7;
            rijalg.Mode = CipherMode.CBC;
            rijalg.Key = Convert.FromBase64String(key);
            rijalg.IV = Convert.FromBase64String(iv);

            byte[] encryptedData = Convert.FromBase64String(encryptedDataStr);
            //解密 
            ICryptoTransform decryptor = rijalg.CreateDecryptor(rijalg.Key, rijalg.IV);

            s