Lua Requires Chilkat v9.5.0.99+

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. Lua

local chilkat = require("chilkat")

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

local pdf = chilkat.Pdf.new()

-- Load the PDF that has already been signed.
local success = pdf:load_file("qa_data/pdf/helloWorld_signed.pdf")
if not success then
    print(pdf.last_error_text)
    return
end

local json = chilkat.JsonObject.new()

json:update_bool("invisibleSignature", true)
json:update_string("subFilter", "/ETSI.RFC3161")

json:update_bool("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:update_string("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:update_string("timestampToken.tsaUsername", "the_tsa_username")
json:update_string("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:update_bool("timestampToken.requestTsaCert", true)

success = pdf:sign_pdf(json, "c:/temp/qa_output/helloWorld_signed_2.pdf")
if not success then
    print(pdf.last_error_text)
    return
end

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