(PHP ActiveX) Validate a .pkpass Archive

Opens a .pkpass archive (which is just a .zip renamed to .pkpass) and validates the contents. The hashes in the manifest are compared with the computed hash values for each individual file. If all computed hash values match, then the signature is verified.

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 assumes 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.Crypt2')
$crypt = new COM("Chilkat.Crypt2");
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Zip')
$zip = new COM("Chilkat.Zip");

$success = $zip->OpenZip('qa_data/pkpass/invalid.pkpass');
if ($success == 0) {
    print $zip->LastErrorText . "\n";
    exit;
}

// Get the contents of the manifest.json file, which contains something like this:

// {
//   "icon.png" : "0296b01347b3173e98438a003b0e88986340b2d8",
//   "logo.png" : "25de09e2d3b01ce1fe00c2ca9a90a2be1aaa05cf",
//   "icon@2x.png" : "5afd9585b08c65fdf105a90c8bd643407cba2787",
//   "pass.json" : "145ea5a5db784fff485126c77ecf7a1fc2a88ee7",
//   "strip@2x.png" : "468fa7bc93e6b55342b56fda09bdce7c829d7d46",
//   "strip.png" : "736d01f84cb73d06e8a9932e43076d68f19461ff"
// }

// ent is a Chilkat.ZipEntry
$ent = $zip->GetEntryByName('manifest.json');
if ($zip->LastMethodSuccess == 0) {
    print 'manifest.json entry not found.' . "\n";
    exit;
}

// Get the exact content of the manifest.json for later signature verification.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bdManifest = new COM("Chilkat.BinData");
$success = $ent->UnzipToBd($bdManifest);

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject')
$json = new COM("Chilkat.JsonObject");
$json->EmitCompact = 0;
$json->Load($ent->unzipToString(0,'utf-8'));
print $json->emit() . "\n";

// For each file in the JSON, get the filename and hex hash value.
$crypt->EncodingMode = 'hexlower';
$crypt->HashAlgorithm = 'sha1';

$someHashesFailed = 0;

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbHashHex = new COM("Chilkat.StringBuilder");
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bdFileData = new COM("Chilkat.BinData");
$numMembers = $json->Size;
$i = 0;
while ($i < $numMembers) {
    $filename = $json->nameAt($i);
    $sbHashHex->Clear();
    $sbHashHex->Append($json->stringAt($i));

    // ent is a Chilkat.ZipEntry
    $ent = $zip->GetEntryByName($filename);
    if ($zip->LastMethodSuccess == 0) {
        print $filename . ' not found in the pkpass file.' . "\n";
        exit;
    }

    // Get the data for this file.
    $bdFileData->Clear();
    $success = $ent->UnzipToBd($bdFileData);

    $computedHashHex = $crypt->hashBdENC($bdFileData);
    if ($sbHashHex->ContentsEqual($computedHashHex,0) == 0) {
        print 'Computed hash does not match stored hash for ' . $filename . "\n";
        print '  computed: ' . $computedHashHex . "\n";
        print '  stored:   ' . $sbHashHex->getAsString() . "\n";
        $someHashesFailed = 1;
    }
    else {
        print 'hash verified for ' . $filename . '(' . $computedHashHex . ')' . "\n";
    }

    $i = $i + 1;
}

if ($someHashesFailed == 1) {
    print 'Some hashes failed.' . "\n";
    exit;
}

// Let's verify the signature..
// First get the signature.
// ent is a Chilkat.ZipEntry
$ent = $zip->GetEntryByName('signature');
if ($zip->LastMethodSuccess == 0) {
    print 'signature not found in the pkpass file.' . "\n";
    exit;
}

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bdSignature = new COM("Chilkat.BinData");
$success = $ent->UnzipToBd($bdSignature);

// Show the contents of the signature in base64 encoding.
print 'Signature:' . "\n";
print $bdSignature->getEncoded('base64_mime') . "\n";
print '----' . "\n";

// Verify the signature against the manifest.json
$crypt->EncodingMode = 'base64';
$verified = $crypt->VerifyBdENC($bdManifest,$bdSignature->getEncoded('base64'));
if ($verified == 0) {
    print $crypt->LastErrorText . "\n";
}

print 'signature verified = ' . $verified . "\n";

?>