(PHP Extension) Add a Document Timestamp Signature to an already-signed PDF

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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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<?php

include("chilkat_9_5_0.php");

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

$pdf = new CkPdf();

// Load the PDF that has already been signed.
$success = $pdf->LoadFile('qa_data/pdf/helloWorld_signed.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

$json = new CkJsonObject();

$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) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

print 'Successfully added a Document Timestamp Signature to the PDF' . "\n";

?>