(PHP ActiveX) Verify XAdES with External File Reference

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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.

// Load the XAdES file to be validated..
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbXml = new COM("Chilkat.StringBuilder");
$success = $sbXml->LoadFile('qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES','utf-8');
if ($success == 0) {
    print 'Failed to load XAdES input file.' . "\n";
    exit;
}

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

// Specify a set of absolute or relative directory paths to be searched for any external file references.
// Directory paths are separated by semicolon chars.
$validator->ExternalRefDirs = 'qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir';

$success = $validator->LoadSignatureSb($sbXml);
if ($success == 0) {
    print $validator->LastErrorText . "\n";
    exit;
}

// Validate signatures as usual..
$i = 0;
while ($i < $validator->NumSignatures) {
    $validator->Selector = $i;

    $valid = $validator->VerifySignature(1);
    print 'Signature ' . ($i + 1) . ' and all reference digests OK = ' . $valid . "\n";

    $i = $i + 1;
}


?>