PdfDocument not save using digital signature

[Marcelo]

I have a word file that after changing I need to convert to PDF and digitally sign

            var entity = db.Records.FirstOrDefault(x => x.Id);

            var blob = AzureBlob.DownloadStream(entity.TemplateId);

            var DocWord = new WordDocument(blob);

            // Edit DocWord using Replace("<>", entity.Name, true,true); and others properties

            DocToPDFConverter converter = new DocToPDFConverter();

            PdfDocument pdfDocument = converter.ConvertToPDF(DocWord);

            pdfDocument.Compression = PdfCompressionLevel.Best;

            //Add graphic

            PdfGraphics graphics = pdfDocument.Pages[0].Graphics;

            //Load certificate

            var digitalCertificate = db.DigitalCertificates.Where(x => x.Id == entity.DigitalCertificateId).FirstOrDefault(); 

            //load X509Certificate2 using byte[] 

            var x509 = new X509Certificate2(digitalCertificate.Cert, EncryptionHelper.Decrypt(digitalCertificate.Password), , X509KeyStorageFlags.UserKeySet);

            PdfCertificate pdfCert = new PdfCertificate(x509);

            PdfSignature signature = new PdfSignature(pdfDocument, pdfDocument.Pages[0], pdfCert, "Sign");

            //Create image

            PdfBitmap signatureImage = new PdfBitmap(HttpContext.Current.Server.MapPath(@"~/Content/images/pdfStamp.png"));

            

            signature.Certificated = true;

            signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges;

            signature.Bounds = new RectangleF(new PointF(0, 0), signatureImage.PhysicalDimension);

           

            graphics.SetTransparency(0.10F);

            graphics.DrawImage(signatureImage, 15, 740);

            PdfFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 10), true);

            graphics.SetTransparency(0.40F);

            graphics.DrawString("Sign in by", font, PdfBrushes.Black, new PointF(85, 760));

            graphics.DrawString(x509.FriendlyName, font, PdfBrushes.Black, new PointF(85, 770));

            graphics.DrawString($"{DateTime.Now.ToString("dd/MM/yyyy HH:mm")}", font, PdfBrushes.Black, new PointF(85, 780));

            //Convert save

            var result = new MemoryStream();

            pdfDocument.Save(result);

            result.Seek(0, SeekOrigin.Begin);

Localhost its ok

In server (Azure Web App S1) this Exception:

System.Security.Cryptography.CryptographicException: The system cannot find the file specified.       at System.Security.Cryptography.Pkcs.PkcsUtils.CreateSignerEncodeInfo(CmsSigner signer, Boolean silent, SafeCryptProvHandle& hProv)     at System.Security.Cryptography.Pkcs.SignedCms.Sign(CmsSigner signer, Boolean silent)     at System.Security.Cryptography.Pkcs.SignedCms.ComputeSignature(CmsSigner signer, Boolean silent)     at Syncfusion.Pdf.Security.PdfSignatureDictionary.SignCertificate(Byte[] message, X509Certificate2 cert, Boolean detached)     at Syncfusion.Pdf.Security.PdfSignatureDictionary.GetStoreCertificate()     at Syncfusion.Pdf.Security.PdfSignatureDictionary.DocumentSaved(Object sender, DocumentSavedEventArgs e)     at Syncfusion.Pdf.PdfDocumentBase.OnDocumentSaved(DocumentSavedEventArgs args)     at Syncfusion.Pdf.PdfDocument.Save(Stream stream)     at HealthModule.Data.Domain.Records.RecordHelper.Sign(AppDbContext db, Guid id, Guid digitalCertificateId, String password, Guid tenantId)

Synfusion Version:

 

   package id="Syncfusion.Compression.Base" version="18.1.0.43" targetFramework="net472"

  package id="Syncfusion.DocIO.ClientProfile" version="18.1.0.43" targetFramework="net472"

  package id="Syncfusion.DocToPdfConverter.ClientProfile" version="18.1.0.43" targetFramework="net472"

  package id="Syncfusion.Licensing" version="18.1.0.43" targetFramework="net472"

  package id="Syncfusion.OfficeChart.Base" version="18.1.0.43" targetFramework="net472"

  package id="Syncfusion.Pdf.ClientProfile" version="18.1.0.43" targetFramework="net472"

 

 .net framework 4.7.2

[Sowmiya Loganathan]

Hi Marcelo,  

 

Thank you for contacting Syncfusion support.  

 

Currently we are trying to reproduce the reported issue. We will update the further details on 9^th April,2020.  

 

Regards, 

Sowmiya Loganathan 

[Sowmiya Loganathan]

Hi Marcelo,   

  

Thank you for your patience.   

  

We were able to see the reported issue “While Sign the PDF document using X509Certificate in Azure”. However, we can overcome this error by directly load the certificate in “PdfCertificate” overload and please find the below code snippet for more details,  

  

//Creates a certificate instance from PFX file with private key  

Stream certificateStream = new FileStream(path, FileMode.Open);  

PdfCertificate pdfCertificate = new PdfCertificate(certificateStream, "syncfusion");  

  

PdfSignature signature = new PdfSignature(document, document.Pages[0], pdfCertificate,"Sign");  

                

Please try the above solution in your end and let us know the result.   

  

Regards,  

Sowmiya Loganathan