B4X

Add a Document Timestamp Signature to an already-signed PDF

See more PDF Signatures Examples

Demonstrates how to add a document timestamp signature to an already-signed PDF.

Note: This example requires Chilkat v9.5.0.99 or greater.

B4X

Dim success As Boolean = False

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim pdf As ChilkatPdf
pdf.Initialize("pdf")

'  Load the PDF that has already been signed.
success = pdf.LoadFile("qa_data/pdf/helloWorld_signed.pdf")
If success = False Then
    Log(pdf.LastErrorText)
    Return
End If


Dim json As ChilkatJsonObject
json.Initialize

json.UpdateBool("invisibleSignature", True)
json.UpdateString("subFilter", "/ETSI.RFC3161")

json.UpdateBool("timestampToken.enabled", True)

'  In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
json.UpdateString("timestampToken.tsaUrl", "http://timestamp.digicert.com")

'  If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
json.UpdateString("timestampToken.tsaUsername", "the_tsa_username")
json.UpdateString("timestampToken.tsaPassword", "the_tsa_password")

'  When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
'  This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
'  has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
json.UpdateBool("timestampToken.requestTsaCert", True)

success = pdf.SignPdf(json, "c:/temp/qa_output/helloWorld_signed_2.pdf")
If success = False Then
    Log(pdf.LastErrorText)
    Return
End If


Log("Successfully added a Document Timestamp Signature to the PDF")