(PHP Extension) 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..)

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.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..
$sbXml = new CkStringBuilder();
$success = $sbXml->LoadFile('qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES','utf-8');
if ($success == false) {
    print 'Failed to load XAdES input file.' . "\n";
    exit;
}

$validator = new CkXmlDSig();

// 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->put_ExternalRefDirs('qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir');

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

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

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

    $i = $i + 1;
}


?>