Assistance Required for ZATCA SDK 3.3.6 - Signed Properties Hashing Error

[eCloud]

Not sure, I think you need to add this line in your Invoice

<?xml version="1.0" encoding="UTF-8"?>

and resigned your XML.

Your xml

Your xml + encoding tag

For your code, as you use Zatca.eInvoice.SDK you can try this simple code to signing, Create Api Payload, get InvoiceHash and get base64QrCode.

using Newtonsoft.Json;
using System;
using System.IO;
using System.Text;
using System.Xml;
using Zatca.EInvoice.SDK;
using Zatca.EInvoice.SDK.Contracts.Models;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {
            string x509CertificateContent = "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"; 
            string privateKeyContent = "MHQCAQEEIL14JV+5nr/sE8Sppaf2IySovrhVBtt8+yz+g4NRKyz8oAcGBSuBBAAKoUQDQgAEoWCKa0Sa9FIErTOv0uAkC1VIKXxU9nPpx2vlf4yhMejy8c02XJblDq7tPydo8mq0ahOMmNo8gwni7Xt1KT9UeA==";
            string xmlPath = @"C:\Tmp\testxml.xml";
           
            XmlDocument xmlDocument = new XmlDocument();
            xmlDocument.Load(xmlPath);

            // Make sure xml has encoding tag and not linearized to avoid Hasing Error by Zatca Server
            xmlDocument = PrettyXml(xmlDocument);

            // Call GenerateRequestApi and capture the results
            var (requestResult, invoiceHash, base64QrCode) = GenerateRequestApi(xmlDocument, x509CertificateContent, privateKeyContent);

            // Print all results
            Console.WriteLine("Request Result: \n" + JsonConvert.SerializeObject(requestResult.InvoiceRequest));
            Console.WriteLine("\nInvoice Hash: " + invoiceHash);
            Console.WriteLine("\nBase64 QR Code: " + base64QrCode);

            Console.ReadLine();
        } 

        public static (RequestResult requestResult, string InvoiceHash, string Base64QrCode) GenerateRequestApi(XmlDocument document, string x509CertificateContent, string privateKey)
        {
            SignResult signedInvoiceResult = new EInvoiceSigner().SignDocument(document, x509CertificateContent, privateKey);

            if (signedInvoiceResult.IsValid)
            {
                // Get InvoiceHash and  QrCode from Signed Invoice
                var (invoiceHash, base64QrCode) = ExtractInvoiceHashAndBase64QrCode(signedInvoiceResult.SignedEInvoice);

                var requestResult = new RequestGenerator().GenerateRequest(signedInvoiceResult.SignedEInvoice);
                return (requestResult, invoiceHash, base64QrCode);
            }
            else
            {
                // Handle the case when the signing is not valid
                return (null, null, null); // Adjust as needed
            }
        }

        public static (string invoiceHash, string base64QRCode) ExtractInvoiceHashAndBase64QrCode(XmlDocument doc)
        {
            XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
            nsmgr.AddNamespace("ext", "urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2");
            nsmgr.AddNamespace("ds", "http://www.w3.org/2000/09/xmldsig#");
            nsmgr.AddNamespace("cbc", "urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2");
            nsmgr.AddNamespace("cac", "urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2");

            // Extracting specific DigestValue for invoiceSignedData
            string invoiceHash = doc.SelectSingleNode("//ds:Reference[@Id='invoiceSignedData']/ds:DigestValue", nsmgr)?.InnerText;
            string base64QRCode = doc.SelectSingleNode("//cac:AdditionalDocumentReference[cbc:ID='QR']/cac:Attachment/cbc:EmbeddedDocumentBinaryObject", nsmgr)?.InnerText;

            return (invoiceHash, base64QRCode);
        }

        public static XmlDocument PrettyXml(XmlDocument inputXml)
        {
            XmlDocument formattedXml = new XmlDocument() { PreserveWhitespace = true};

            using (MemoryStream memoryStream = new MemoryStream())
            {
                using (StreamWriter streamWriter = new StreamWriter(memoryStream, new UTF8Encoding(false))) // false to exclude BOM
                {
                    XmlWriterSettings settings = new XmlWriterSettings()
                    {
                        Indent = true,
                        IndentChars = "    ",
                        OmitXmlDeclaration = false,
                        Encoding = Encoding.UTF8,
                    };

                    using (XmlWriter xmlWriter = XmlWriter.Create(streamWriter, settings))
                    {
                        inputXml.Save(xmlWriter);
                    }
                }

                // Get the UTF-8 encoded string from the MemoryStream
                string utf8Xml = Encoding.UTF8.GetString(memoryStream.ToArray()).Trim();
                
                // Load the UTF-8 XML string into the new XmlDocument
                formattedXml.LoadXml(utf8Xml);
            }

            return formattedXml;
        }
    }
}