Is this possible?

function udb_hash($buf) { 
    $length=strlen($buf); 
    $s1 = 1; 
    $s2 = 0; 
    for($n=0; $n<$length; $n++) 
    { 
       $s1 = $s1 + ord($buf[$n]) % 65521; 
       $s2 = $s2 + $s1 % 65521; 
} 
   return ($s2 << 16) + $s1; 
} 

Is it possible to crack a hash with this algorithm since it isn't implemented with hashcat? Or would I need to make a request?