Classic ASP
Sign PDF with Timestamp from TSA (Timestamp Server Authority)

This example demonstrates how to a sign a PDF that is both long-term validation (LTV) enabled and includes a validating timestamp from a TSA (Timestamp Server Authority).
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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 a PDF to be signed.
' The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
success = pdf.LoadFile("qa_data/pdf/hello.pdf")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
    Response.End
End If

' Options for signing are specified in JSON.
set json = Server.CreateObject("Chilkat.JsonObject")

' In most cases, the signingCertificateV2 and signingTime attributes are required.
success = json.UpdateInt("signingCertificateV2",1)
success = json.UpdateInt("signingTime",1)

' Tell Chilkat to create an LTV-enabled (long term validation) signature.
' See PDF Long-Term Validation (LTV) Signature Example for more detailed comments about "ltvOcsp".
success = json.UpdateBool("ltvOcsp",1)

' Tell Chilkat to request a timestamp from a TSA server and include the timestamp token (1.2.840.113549.1.9.16.2.14)
' in the CMS signature's authentication attributes
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)

' Define the appearance of the signature.
success = json.UpdateInt("page",1)
success = json.UpdateString("appearance.y","top")
success = json.UpdateString("appearance.x","left")
success = json.UpdateString("appearance.fontScale","10.0")
success = json.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
success = json.UpdateString("appearance.text[1]","current_dt")
success = json.UpdateString("appearance.text[2]","This is an LTV-enabled signature with a TSA timestamp.")

' Load the signing certificate. (Use your own certificate.)
set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","pfxPassword")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

' Tell the pdf object to use the certificate for signing.
success = pdf.SetSigningCert(cert)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pdf.LastErrorText) & "</pre>"
    Response.End
End If

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

Response.Write "<pre>" & Server.HTMLEncode( "The PDF has been successfully cryptographically signed with TSA timestamp and long-term validation.") & "</pre>"

' If you open the Signature Panel in Adobe Acrobat, it will indicate that the signature is LTV enabled
' and contains an embedded timestamp:
' (image:https://example-code.com/images/ltv_signature_with_timestamp.jpg/endImage)

%>
</body>
</html>