use Proget\Samsung\KnoxToken\Certificate;
use Proget\Samsung\KnoxToken\KnoxToken;

$clientIdentifierJwt = KnoxToken::signClientIdentifier('your-client-identifier', Certificate::fromPath('keys.json'));

use Proget\Samsung\KnoxToken\Certificate;
use Proget\Samsung\KnoxToken\KnoxToken;

$accessTokenJwt = KnoxToken::signAccessToken('access-token', Certificate::fromPath('keys.json'));

use Proget\Samsung\KnoxToken\Certificate;

$certificate = Certificate::fromPath('keys.json');

$certificate->publicKey();
$certificate->privateKeyPem();