Classic ASP

Add a Document Timestamp Signature to an already-signed PDF

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

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

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

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

set pdf = Server.CreateObject("Chilkat.Pdf")

' Load the PDF that has already been signed.
success = pdf.LoadFile("qa_data/pdf/helloWorld_signed.pdf")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
    Response.End
End If

set json = Server.CreateObject("Chilkat.JsonObject")

success = json.UpdateBool("invisibleSignature",1)
success = json.UpdateString("subFilter","/ETSI.RFC3161")

success = json.UpdateBool("timestampToken.enabled",1)

' In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
success = 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.
success = json.UpdateString("timestampToken.tsaUsername","the_tsa_username")
success = 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.)
success = json.UpdateBool("timestampToken.requestTsaCert",1)

success = pdf.SignPdf(json,"c:/temp/qa_output/helloWorld_signed_2.pdf")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Successfully added a Document Timestamp Signature to the PDF") & "</pre>"

%>
</body>
</html>