PHP

Verify XAdES with External File Reference

See more XML Digital Signatures Examples

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..) Chilkat2 PHP

<?php

use Chilkat2\StringBuilder;
use Chilkat2\XmlDSig;

// 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 StringBuilder();
try {
    $sbXml->LoadFile('qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES', 'utf-8');
} catch (\Chilkat2\Exception $e) {
    echo "Failed to load XAdES input file.\n";
    exit;
}

$validator = new 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';

try {
    $validator->LoadSignatureSb($sbXml);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

    try {
        $validator->VerifySignature(true);
        $valid = true;
    } catch (\Chilkat2\Exception $e) {
        $valid = false;
    }
    echo 'Signature ', $i + 1, ' and all reference digests OK = ', ($valid ? 'true' : 'false'), "\n";

    $i = $i + 1;
}