public static function parseKey()

in src/JWK.php [74:110]

• 31 lines of code
• 9 McCabe index (conditional complexity)

    public static function parseKey(array $jwk)
    {
        if (empty($jwk)) {
            throw new InvalidArgumentException('JWK must not be empty');
        }
        if (!isset($jwk['kty'])) {
            throw new UnexpectedValueException('JWK must contain a "kty" parameter');
        }
        if (!isset($jwk['alg'])) {
            // The "alg" parameter is optional in a KTY, but is required for parsing in
            // this library. Add it manually to your JWK array if it doesn't already exist.
            // @see https://datatracker.ietf.org/doc/html/rfc7517#section-4.4
            throw new UnexpectedValueException('JWK must contain an "alg" parameter');
        }

        switch ($jwk['kty']) {
            case 'RSA':
                if (!empty($jwk['d'])) {
                    throw new UnexpectedValueException('RSA private keys are not supported');
                }
                if (!isset($jwk['n']) || !isset($jwk['e'])) {
                    throw new UnexpectedValueException('RSA keys must contain values for both "n" and "e"');
                }

                $pem = self::createPemFromModulusAndExponent($jwk['n'], $jwk['e']);
                $publicKey = \openssl_pkey_get_public($pem);
                if (false === $publicKey) {
                    throw new DomainException(
                        'OpenSSL error: ' . \openssl_error_string()
                    );
                }
                return new Key($publicKey, $jwk['alg']);
            default:
                // Currently only RSA is supported
                break;
        }
    }