Devise\Support\IO\FileDiff::md5 PHP Method

    protected function md5($dir)
    {
        $sums = [];
        if (!$this->File->isDirectory($dir)) {
            return [];
        }
        $allFiles = $this->File->allFiles($dir);
        foreach ($allFiles as $file) {
            $sums[$file->getRelativePathname()] = md5_file($file);
        }
        return $sums;
    }