lib/Middleware/DigestAuthMiddleware.php
private function hash($value): ?string
    {
        $algorithm = $this->getAlgorithm();
        if (('MD5' == $algorithm) || ('MD5-sess' == $algorithm)) {
            return hash('md5', $value);
        }

        return null;
    }
private function hash($value): ?string
    {
        $algorithm = $this->getAlgorithm();
        if (('MD5' == $algorithm) || ('MD5-sess' == $algorithm)) {
            return hash('md5', $value);
        }

        return null;
    }
Calculates the hash for a given value using the algorithm specified by the server.

@param string $value The value to be hashed

@return string the hashed value