Hautelook\Phpass\PasswordHash::gensalt_extended PHP Метод

    public function gensalt_extended($input)
    {
        $count_log2 = min($this->iteration_count_log2 + 8, 24);
        // This should be odd to not reveal weak DES keys, and the
        // maximum valid value is (2**24 - 1) which is odd anyway.
        $count = (1 << $count_log2) - 1;
        $output = '_';
        $output .= $this->itoa64[$count & 0x3f];
        $output .= $this->itoa64[$count >> 6 & 0x3f];
        $output .= $this->itoa64[$count >> 12 & 0x3f];
        $output .= $this->itoa64[$count >> 18 & 0x3f];
        $output .= $this->encode64($input, 3);
        return $output;
    }