PHP Extension

Get a JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.GetProtectedH, which copies the decoded protected header of a signature into a JsonObject.

Background. The protected header is integrity-protected by the signature. Inspecting it (for example the alg value) is useful before deciding how to validate.

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PHP Extension

<?php

include("chilkat.php");

$success = false;

$jws = new CkJws();

//  Load the JWS compact serialization.
$jwsCompact = 'eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>';
$success = $jws->LoadJws($jwsCompact);
if ($success == false) {
    print $jws->lastErrorText() . "\n";
    exit;
}

//  Copy the decoded protected header of signature 0 into a JsonObject.
$json = new CkJsonObject();
$success = $jws->GetProtectedH(0,$json);
if ($success == false) {
    print $jws->lastErrorText() . "\n";
    exit;
}

$json->put_EmitCompact(false);
print $json->emit() . "\n";

?>