C# RSA PSS签名 微信的加密与签名

Question

请用C#帮我解答
服务端api签名
https://developers.weixin.qq.com/miniprogram/dev/OpenApiDoc/getting_started/api_signature.html
这是微信的网址。

这是我访JAVA的成功网址
https://developers.weixin.qq.com/community/develop/article/doc/000e68b8038ed8796f00f6c2f68c13

 public static string RSASignPEM(string data, string privateKeyPEM, string hashAlgorithm = "MD5", string encoding = "UTF-8")

        {

            byte[] pemkey = Convert.FromBase64String(privateKeyPEM);



            RSACryptoServiceProvider RSA = DecodeRSAPrivateKey(privateKeyPEM);//function to parse .pem file 



            RSAParameters rsaParams = RSA.ExportParameters(true);

            RSACng RSACng = new RSACng();

            RSACng.ImportParameters(rsaParams);

            var dataBytes = Encoding.GetEncoding(encoding).GetBytes(data);

           byte[] signature = RSACng.SignData(dataBytes, HashAlgorithmName.SHA256,RSASignaturePadding.Pss);

           return Convert.ToBase64String(signature);





    

        }







        /// <summary>

        /// RSA私钥格式转换

        /// </summary>

        /// <param name="privateKey"></param>

        /// <returns></returns>

        private static RSACryptoServiceProvider DecodeRSAPrivateKey(string privateKey)

        {

            var privateKeyBits = System.Convert.FromBase64String(privateKey);

            var RSA = new RSACryptoServiceProvider();

            var RSAparams = new RSAParameters();

            using (BinaryReader binr = new BinaryReader(new MemoryStream(privateKeyBits)))

            {

                byte bt = 0;

                ushort twobytes = 0;

                twobytes = binr.ReadUInt16();

                if (twobytes == 0x8130)

                    binr.ReadByte();

                else if (twobytes == 0x8230)

                    binr.ReadInt16();

                else

                    throw new Exception("Unexpected value read binr.ReadUInt16()");



                twobytes = binr.ReadUInt16();

                if (twobytes != 0x0102)

                    throw new Exception("Unexpected version");



                bt = binr.ReadByte();

                if (bt != 0x00)

                    throw new Exception("Unexpected value read binr.ReadByte()");



                RSAparams.Modulus = binr.ReadBytes(GetIntegerSize(binr));

                RSAparams.Exponent = binr.ReadBytes(GetIntegerSize(binr));

                RSAparams.D = binr.ReadBytes(GetIntegerSize(binr));

                RSAparams.P = binr.ReadBytes(GetIntegerSize(binr));

                RSAparams.Q = binr.ReadBytes(GetIntegerSize(binr));

                RSAparams.DP = binr.ReadBytes(GetIntegerSize(binr));

                RSAparams.DQ = binr.ReadBytes(GetIntegerSize(binr));

                RSAparams.InverseQ = binr.ReadBytes(GetIntegerSize(binr));

            }

            RSA.ImportParameters(RSAparams);

            return RSA;

        }

        private static int GetIntegerSize(BinaryReader binr)

        {

            byte bt = 0;

            byte lowbyte = 0x00;

            byte highbyte = 0x00;

            int count = 0;

            bt = binr.ReadByte();

            if (bt != 0x02)

                return 0;

            bt = binr.ReadByte();



            if (bt == 0x81)

                count = binr.ReadByte();

            else

if (bt == 0x82)

            {

                highbyte = binr.ReadByte();

                lowbyte = binr.ReadByte();

                byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };

                count = BitConverter.ToInt32(modint, 0);

            }

            else

            {

                count = bt;

            }

            while (binr.ReadByte() == 0x00)

            {

                count -= 1;

            }

            binr.BaseStream.Seek(-1, SeekOrigin.Current);

            return count;

        }





C#，这是签名方法，签名后一直提示签名错误
这是调用签名代码
    String url_path = ctx["url_path"].ToString();   

  int reqTs = req["req_ts"].ObjectToInt();

            String reqData = req["req_data"].ToString();



            String payload = url_path + "\n" + local_appid + "\n" + reqTs + "\n" + reqData;

 RSASignPEM(payload, local_private_key); //这里证书用的是直接下载的证书，一直提示签名错误，也不知道哪里出错了。
  var apiUrl = $"{url_path}?access_token={token}"
                   .WithHeader("Content-Type", "application/json;charset=utf-8")
                   .WithHeader("Wechatmp-Appid", local_appid)
                   .WithHeader("Wechatmp-TimeStamp", localTs)
                   .WithHeader("Wechatmp-Signature", sign)

                   ;

        var result = await apiUrl.PostJsonAsync(reqData).ReceiveJson<JObject>();

POST返回一直提示签名出错

Answer 1

你看看这篇博客，应该对你有帮助：

C#实现RSA加密与解密、签名与认证_c# rsa签名_wuguanglong01的博客-CSDN博客 阿斯蒂芬萨芬撒地方了了阿斯蒂芬阿斯蒂芬三发生地方拉丝机的反馈拉丝机的反馈加速离开的房间拉斯卡迪机房老师卡机房的了看撒娇了发快递加适量的咖啡机拉斯科技的方式看来打飞机..._c# rsa签名 https://blog.csdn.net/wuguanglong01/article/details/79378326