Signing with certificate and TSA using Aspose.PDF

Aspose.PDF Product Family
1

Hello.

I’m trying to sign a document.
TEST.pdf (28.1 KB)
using the following Test-Certificate:
D-TRUST GmbH - Test_CSM017878135.zip (8.9 KB)
Password: H0FS7R1A6R

I’m using the following code:

Dim pdfDocument As Document = New Document(txtFilename.Text)

Using pdfDocument

    Dim signature As PdfFileSignature = New PdfFileSignature(pdfDocument)        
    Dim pkcs As PKCS7 = New PKCS7("C:\Users\rwa\Desktop\Aspose Durchstich\D-TRUST GmbH - Test_CSM017878135.p12", "H0FS7R1A6R")
            
    Dim rect As System.Drawing.Rectangle = New System.Drawing.Rectangle(40, 0, 500, 100)
    signature.Sign(pdfDocument.Pages.Count, "Reason-Text", "test@123.com", "Location-Text", True, rect, pkcs)

    signature.Save(Path.Combine(DataDir, "Testdokument_Zeitstempel.pdf"))
    signature.Close()


End Using

This seems to be OK. The PDF is signed by the Test-Certificate an it looks like This:
2023-08-03 08_41_48-Testdokument_Zeitstempel.pdf - Adobe Acrobat Reader (64-bit).png (10.5 KB)

However if i add a timeserver to the code like this:

Dim pdfDocument As Document = New Document(txtFilename.Text)

Using pdfDocument

    Dim signature As PdfFileSignature = New PdfFileSignature(pdfDocument)        
    Dim pkcs As PKCS7 = New PKCS7("C:\Users\rwa\Desktop\Aspose Durchstich\D-TRUST GmbH - Test_CSM017878135.p12", "H0FS7R1A6R")
    
    Dim TimestampSettings As TimestampSettings = New TimestampSettings("https://freetsa.org/tsr", String.Empty)
    pkcs.TimestampSettings = TimestampSettings

    Dim rect As System.Drawing.Rectangle = New System.Drawing.Rectangle(40, 0, 500, 100)
    signature.Sign(pdfDocument.Pages.Count, "Reason-Text", "test@123.com", "Location-Text", True, rect, pkcs)

    signature.Save(Path.Combine(DataDir, "Testdokument_Zeitstempel.pdf"))
    signature.Close()


End Using

The document has been signed by the TSA certificate, but not my one and it looks like this:

2023-08-03 08_46_47-Testdokument_Zeitstempel.pdf - Adobe Acrobat Reader (64-bit).png (15.8 KB)

How can i fix/workaround this issue?

ps: I tested the same functionality in aspose.words - there it seems to work!

regards

2

@g.erdl.ots-ag.de

Can you please also share the output PDF document that has been generated in your environment? We will test the scenario in our environment and address it accordingly.

3

Sure.
Here are the documents:
Test_out.pdf (586.6 KB)
Test_out_with_timestamp.pdf (581.8 KB)

regards

4

@g.erdl.ots-ag.de

We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): PDFNET-55205

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.