/// <summary>
        /// 从Cert证书文件中读取
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static RsaCertificate ReadFromCert(string path)
        {
            //var x509cert = new X509Certificate2(path);
            var rsa = new RsaCertificate();

            rsa._certificate2 = new X509Certificate2(path);
            rsa._provider     = new RSACryptoServiceProvider();
            RSA cng = (RSA)rsa._certificate2.PublicKey.Key;

            rsa._provider.ImportParameters(cng.ExportParameters(false));
            return(rsa);
        }
        /// <summary>
        /// 从pfx证书文件中读取
        /// </summary>
        /// <param name="path"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        public static RsaCertificate ReadFromPfx(string path, string password)
        {
            var rsa = new RsaCertificate();

            rsa._provider     = new RSACryptoServiceProvider();
            rsa._certificate2 = new X509Certificate2(path, password, X509KeyStorageFlags.Exportable);
            if (rsa._certificate2.HasPrivateKey)
            {
                RSA cng       = (RSA)rsa._certificate2.PrivateKey;
                var parameter = cng.ExportParameters(true);
                rsa._provider.ImportParameters(parameter);
            }
            else
            {
                //rsa._provider = (RSACryptoServiceProvider)rsa._certificate2.PublicKey.Key;
                RSA cng       = (RSA)rsa._certificate2.PublicKey.Key;
                var parameter = cng.ExportParameters(false);
                rsa._provider.ImportParameters(parameter);
            }
            return(rsa);
        }