PHP

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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Chilkat2 PHP

<?php

use Chilkat2\JsonObject;
use Chilkat2\Jws;

$jws = new Jws();

// Load the JWS compact serialization.
$jwsCompact = 'eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>';
try {
    $jws->LoadJws($jwsCompact);

    // Copy the decoded protected header of signature 0 into a JsonObject.
    $json = new JsonObject();
    $jws->GetProtectedH(0, $json);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$json->EmitCompact = false;
echo $json->Emit(), "\n";