Load and Validate a JWS from a String

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.LoadJws, which loads a JWS from its compact serialization string. The example then supplies the MAC key and validates the signature.

<?php

use Chilkat2\Jws;

$jws = new Jws();

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

    // Provide the HMAC key for signer 0, then validate the signature.  Validate returns 1 when the
    // signature is cryptographically valid, 0 when it is not, or a negative value on error.
    $base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
    $jws->SetMacKey(0, $base64Key, 'base64');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

$v = $jws->Validate(0);
if ($v < 0) {
    echo $jws->LastErrorText, "\n";
    exit;
}

if ($v != 1) {
    echo "The signature is not valid.\n";
    exit;
}

echo "The signature is valid.\n";