protected function getPasswordHashingStrategyAndIdentifier($strategyIdentifier = 'default')
    {
        if (isset($this->passwordHashingStrategies[$strategyIdentifier])) {
            return [$this->passwordHashingStrategies[$strategyIdentifier], $strategyIdentifier];
        }

        if ($strategyIdentifier === 'default') {
            if (!isset($this->strategySettings['default'])) {
                throw new MissingConfigurationException('No default hashing strategy configured', 1320758427);
            }
            $strategyIdentifier = $this->strategySettings['default'];
        }

        if (!isset($this->strategySettings[$strategyIdentifier])) {
            throw new MissingConfigurationException('No hashing strategy with identifier "' . $strategyIdentifier . '" configured', 1320758776);
        }
        $strategyObjectName = $this->strategySettings[$strategyIdentifier];
        $this->passwordHashingStrategies[$strategyIdentifier] = $this->objectManager->get($strategyObjectName);
        return [$this->passwordHashingStrategies[$strategyIdentifier], $strategyIdentifier];
    }