if ($a == 0) {
throw new Exception();
}
return $this->expTable[$this->size - $this->logTable[$a] - 1];
}
/**
* @return product of a and b in GF(size)
*/
function multiply($a, $b)
{
if ($a == 0 || $b == 0) {
return 0;
}
return $this->expTable[($this->logTable[$a] + $this->logTable[$b]) % ($this->size - 1)];
}
public function getSize()
{
return $this->size;
}
public function getGeneratorBase()
{
return $this->generatorBase;
}
// @Override
public function toString()
{
return "GF(0x" . dechex(intval($this->primitive)) . ',' . $this->size . ')';
}
}
GenericGF::Init();
