(PHP ActiveX) Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate.

Note: This example requires Chilkat v9.5.0.87 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Pdf')
$pdf = new COM("Chilkat.Pdf");

// Load a PDF that has cryptographic signatures to be validated
$success = $pdf->LoadFile('qa_data/pdf/sign_testing_1/helloSigned2.pdf');
if ($success == 0) {
    print $pdf->LastErrorText . "\n";
    exit;
}

// Each time we verify a signature, information about the signature is written into
// sigInfo (replacing whatever sigInfo previously contained).
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject')
$sigInfo = new COM("Chilkat.JsonObject");

// Iterate over each signature and validate each.
$numSignatures = $pdf->NumSignatures;
$validated = 0;
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert = new COM("Chilkat.Cert");
$i = 0;
while ($i < $numSignatures) {
    $validated = $pdf->VerifySignature($i,$sigInfo);
    print 'Signature ' . $i . ' validated: ' . $validated . "\n";

    // The GetSignerCert method was added in Chilkat v9.5.0.87
    // After calling VerifySignature, you can get the signer certificate by calling
    // GetSignerCert with the same index. 
    $success = $pdf->GetSignerCert($i,$cert);
    if ($success != 0) {
        print 'PDF signer certificate: ' . $cert->SubjectDN . "\n";
    }

    $i = $i + 1;
}

print 'Finished.' . "\n";

?>