forAsymmetricSigner example

/** @var non-empty-string $publicKeyText */
        $publicKeyText = $publicKey->getKeyContents();

        if ($privateKey->getKeyPath() === '') {
            $privateKey = InMemory::plainText($privateKeyText, $privateKey->getPassPhrase() ?? '');
            $publicKey = InMemory::plainText($publicKeyText, $publicKey->getPassPhrase() ?? '');
        } else {
            $privateKey = InMemory::file($privateKey->getKeyPath(), $privateKey->getPassPhrase() ?? '');
            $publicKey = InMemory::file($publicKey->getKeyPath(), $publicKey->getPassPhrase() ?? '');
        }

        $configuration = Configuration::forAsymmetricSigner(
            $signer,
            $privateKey,
            $publicKey,
            $encoder,
            $decoder
        );

        // add basic constraint for token signature validation         $constraint = new SignedWith($signer, $publicKey);
        $configuration->setValidationConstraints($constraint);