Canonicalized XML with C# class library with .Net DLL Importer doesn't work

hi all,

Tried look for XML Canonicalization and only solution is via C# DLL Import. However, when successful created the DLL and import into PB2022R2, the function hanged when calling the of_canonicalizexml function. Need advise what wrong with it. Hereby included the C# class library and PB script calling :

VS2019 C# class library :

using System;
using System.IO;
using System.Security.Cryptography.Xml;
using System.Xml;

namespace XmlCanonicalizationLibrary
{
    public class XmlCanonicalizer
    {
        public string CanonicalizeXml(string xml)
        {
            // Load the XML string into an XmlDocument
            XmlDocument doc = new XmlDocument();
            doc.PreserveWhitespace = true;
            doc.LoadXml(xml);

            // Create a new XML canonicalization transform
            XmlDsigC14NTransform c14nTransform = new XmlDsigC14NTransform();

            // Load the XmlDocument into the transform
            c14nTransform.LoadInput(doc);

            // Canonicalize and get the result as a stream
            using (Stream canonicalizedStream = (Stream)c14nTransform.GetOutput(typeof(Stream)))
            {
                StreamReader reader = new StreamReader(canonicalizedStream);
                string canonicalizedXml = reader.ReadToEnd();
                return canonicalizedXml;
            }
        }
    }
}

PB Script calling after successful run DLL Importer :

nvo_xmlcanonicalizer lnvo_xmlcanon

lnvo_xmlcanon = Create nvo_xmlcanonicalizer
STRING ls_XMLbefore, ls_XMLafter

ls_XMLbefore = '<ext:UBLExtensions><ext:UBLExtension><ext:ExtensionURI>urn:oasis:names:specification:ubl:dsig:enveloped:xades</ext:ExtensionURI><ext:ExtensionContent><sig:UBLDocumentSignatures xmlns:sig="urn:oasis:names:specification:ubl:schema:xsd:CommonSignatureComponents-2" xmlns:sac="urn:oasis:names:specification:ubl:schema:xsd:SignatureAggregateComponents-2" xmlns:sbc="urn:oasis:names:specification:ubl:schema:xsd:SignatureBasicComponents-2"><sac:SignatureInformation><cbc:ID>urn:oasis:names:specification:ubl:signature:1</cbc:ID><sbc:ReferencedSignatureID>urn:oasis:names:specification:ubl:signature:Invoice</sbc:ReferencedSignatureID><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="signature"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2006/12/xml-c14n11"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference Id="id-doc-signed-data" URI=""><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116"><ds:XPath>not(//ancestor-or-self::ext:UBLExtensions)</ds:XPath></ds:Transform><ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116"><ds:XPath>not(//ancestor-or-self::cac:Signature)</ds:XPath></ds:Transform><ds:Transform Algorithm="http://www.w3.org/2006/12/xml-c14n11"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>RvCSpMYz8009KbJ3ku72oaCFWpzEfQNcpc+5bulh3Jk=</ds:DigestValue></ds:Reference><ds:Reference Type="http://www.w3.org/2000/09/xmldsig#SignatureProperties" URI="#id-xades-signed-props"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>OGU1M2Q3NGFkOTdkYTRiNDVhOGZmYmU2ZjE0YzI3ZDhhNjlmM2EzZmQ4MTU5NTBhZjBjNDU2MWZlNjU3MWU0ZQ==</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>MEYCIQDYsDnviJYPgYjyCIYAyzETeYthIoJaQhChblP4eAAPPAIhAJl6zfHgiKmWTtsfUz8YBZ8QkQ9rBL4Uy7mK0cxvWooH</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>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</ds:X509Certificate></ds:X509Data></ds:KeyInfo><ds:Object><xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" Target="signature"><xades:SignedProperties Id="id-xades-signed-props"><xades:SignedSignatureProperties><xades:SigningTime>2024-04-01T00:41:21Z</xades:SigningTime><xades:SigningCertificate><xades:Cert><xades:CertDigest><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>YTJkM2JhYTcwZTBhZTAxOGYwODMyNzY3NTdkZDM3YzhjY2IxOTIyZDZhM2RlZGJiMGY0NDUzZWJhYWI4MDhmYg==</ds:DigestValue></xades:CertDigest><xades:IssuerSerial><ds:X509IssuerName>CN = Contoso Malaysia Sdn Bhd, E = noemail@contoso.com, OU = Contoso Malaysia Sdn Bhd, O = Contoso Malaysia Sdn Bhd, C = MY</ds:X509IssuerName><ds:X509SerialNumber>2475382886904809774818644480820936050208702411</ds:X509SerialNumber></xades:IssuerSerial></xades:Cert></xades:SigningCertificate></xades:SignedSignatureProperties></xades:SignedProperties></xades:QualifyingProperties></ds:Object></ds:Signature></sac:SignatureInformation></sig:UBLDocumentSignatures></ext:ExtensionContent></ext:UBLExtension></ext:UBLExtensions>'
ls_XMLafter  = lnvo_xmlcanon.of_canonicalizexml(ls_XMLbefore)

Please help.

regards,

Dev Ong.

Resolved Canonicalized XML with C# class library with .Net DLL Importer doesn't work