Sign a JWS with an HMAC Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetMacKey, which sets the symmetric MAC key for a signature. The key bytes are supplied in a named encoding such as hex or base64.

use chilkat();

$success = 0;

$jws = chilkat::CkJws->new();

#  Protected header specifying HMAC-SHA256.
$header = chilkat::CkJsonObject->new();
$header->UpdateString("alg","HS256");
$success = $jws->SetProtectedHeader(0,$header);
if ($success == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

$bIncludeBom = 0;
$success = $jws->SetPayload("This is the content to sign.","utf-8",$bIncludeBom);
if ($success == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

#  Set the symmetric MAC key for signature 0.  The key bytes are provided in the named encoding (here
#  base64).  In production, obtain the key from a secure source rather than hard-coding it.
$base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
$success = $jws->SetMacKey(0,$base64Key,"base64");
if ($success == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

$jwsCompact = $jws->createJws();
if ($jws->get_LastMethodSuccess() == 0) {
    print $jws->lastErrorText() . "\r\n";
    exit;
}

print $jwsCompact . "\r\n";