Invalid Signature

Hello,

I had a problem with a newsletter where the links were causing an “Invalid signature” error.
I’m using version 9.4.1, and the newsletter was sent using version 9.3.9.
I investigated the source of the error and had to modify the verify_signature function in the statistics.php file to fix the problem.

Here’s the modification I made:

    function verify_signature($text, $signature) {
        $signature = trim($signature);
        if (!$signature) {
            return 0;
        }

        $parts = explode('.', $signature, 2);
        if (count($parts) === 2) {
            $time = (int) $parts[0];

            $verified = hash_equals(md5($text . $time . $this->get_key()), $parts[1]);

            if (!$verified) {
                return 0;
            }
            return $time >= time() ? 1 : 2;
        } else {
            //return $this->check_signature($text, $signature) ? 2 : 0;
            return (md5($text . $this->get_key()) === $signature) ? 2 : 0;
        }
    }

Can you please fix this in the next version.