Description:
------------
when trying to hash large files (cant say yet how large, but a 800MB file was hashed without problems but a 1300MB file not), the script times out after about 1 minute even if max. execution time is set to half an hour. smaller files, such as the 800MB file were successfully hashed a few times using different hashing methods (in total the script took about 4 minutes to run).

Reproduce code:
---------------
// tried both:

    $fp = fopen('file.ext', "r");
    $ctx = hash_init('sha512');
    while (!feof($fp)) {
        hash_update($ctx, fgets($fp,$bytes));
    }
    $res_hash = hash_final($ctx);  // this would be line 58
    fclose($fp);

// and

    hash_file('sha512', 'file.ext'); // this would be line 67

// $bytes were set to anywhere from 4kB to 32MB.. same result all the time

Expected result:
----------------
obviously, a hash.

Actual result:
--------------
Fatal error:  Maximum execution time of 1800 seconds exceeded in /opt/apache/htdocs/hashtest.php on line 58.

or

Fatal error:  Maximum execution time of 1800 seconds exceeded in /opt/apache/htdocs/hashtest.php on line 67.

depending what piece of code was commented.