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

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;
}

//  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=';
$success = $jws->SetMacKey(0,$base64Key,'base64');
if ($success == false) {
    print $jws->lastErrorText() . "\n";
    exit;
}

$v = $jws->Validate(0);
if ($v < 0) {
    print $jws->lastErrorText() . "\n";
    exit;
}

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

print 'The signature is valid.' . "\n";

?>