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Certificate for signing a pdf file

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Posted by jeremie · 16-10-2020 - 14:59

I'm trying to sign a PDF file.

I bought a certificate from GlobalSign. They sent me a .pfx file that I converted to a .pem file. Then I signed the PDF using your code:

require_once $root.'Libraries/phpdocx-premium-9.5/classes/SignPDF.php'; 
$sign = new SignPDF(); 
$sign->setPDF('Test.pdf');
$sign->setPrivateKey('Test.pem', 'phpdocx_pass'); 
$sign->setX509Certificate('Test.pem'); 
$sign->sign('Test_signed.pdf');

'Test_signed.pdf' is created and I can see the signature in it when I open it with Adobe Acrobat Reader.

I can see my name on it, but Adobe displays a message saying that the validity of the certification is uknown because they can't authenticate me.

What am I missing?

Posted by admin · 16-10-2020 - 15:48

Hello,

Adobe, and other programs, displays the validity of the certification is uknown message when the certificate/CA is not trusted by Adobe, so you need to accept (trust) it or use a certificate accepted in Adobe as trusted.

We recommend you to check if AATL is updated in your Adobe PDF reader (https://support.globalsign.com/aatl-document/how-manually-update-adobe-approved-trust-list-aatl-adobe-acrobat-reader) and the certificate/CA you are using is trusted by Adobe.

On https://stackoverflow.com/questions/13979845/signed-pdf-showing-message-the-validity-of-the-document-is-unknown-itext you can read more information when Adobe displays that message.

Regards.