Jose\KeyConverter\KeyConverter::loadKeyFromPEM PHP Method

    private static function loadKeyFromPEM($pem, $password = null)
    {
        if (preg_match('#DEK-Info: (.+),(.+)#', $pem, $matches)) {
            $pem = self::decodePem($pem, $matches, $password);
        }
        self::sanitizePEM($pem);
        $res = openssl_pkey_get_private($pem);
        if ($res === false) {
            $res = openssl_pkey_get_public($pem);
        }
        Assertion::false($res === false, 'Unable to load the key');
        $details = openssl_pkey_get_details($res);
        Assertion::isArray($details, 'Unable to get details of the key');
        Assertion::keyExists($details, 'type', 'Unable to get details of the key');
        switch ($details['type']) {
            case OPENSSL_KEYTYPE_EC:
                $ec_key = new ECKey($pem);
                return $ec_key->toArray();
            case OPENSSL_KEYTYPE_RSA:
                $rsa_key = new RSAKey($pem);
                return $rsa_key->toArray();
            default:
                throw new \InvalidArgumentException('Unsupported key type');
        }
    }

 /**
  * @param string      $pem
  * @param null|string $password
  * @param array       $additional_values
  *
  * @return \Jose\Object\JWKInterface
  */
 public static function createFromPEM($pem, $password = null, array $additional_values = [])
 {
     $values = KeyConverter::loadKeyFromPEM($pem, $password);
     $values = array_merge($values, $additional_values);
     return new JWK($values);
 }