Create digital signatures for PDF documents with PHP


Digital sign PDF documents with PHP

Certified Document Demo

This demo shows you how to add a certification signature to an existing PDF document.

// or if you use composer require_once('vendor/autoload.php');

// create a Http writer
$writer = new SetaPDF_Core_Writer_Http('certified.pdf', false);
// load document by filename
$document = SetaPDF_Core_Document::loadByFilename('Laboratory-Report.pdf', $writer);

// create a signer instance for the document
$signer = new SetaPDF_Signer($document);

// set some signature properties
$signer->setReason('This document is fixed');
$signer->setContactInfo('+49 5351 523901-0');

// create an OpenSSL module instance
$module = new SetaPDF_Signer_Signature_Module_Cms();
// set the sign certificate
// set the private key for the sign certificate
$module->setPrivateKey([file_get_contents('private-key.pem'), 'password']);
// pass the intermediate certificate(s)

// set the certification level: don't allow any changes

// sign/certify the document

We use certificates from GlobalSign for demonstration. If you want to validate the signature in another viewer application, make sure that the root certificate is added as a trusted identity.