54         $rand = (float)(random_int(0, 10000)) / 10000;
55         $cookie = new FileCookie($this->fixedIdent(), $rand);
59             $code = $this->generateMath($this->fixedIdent(), $rand);
66             $code = $this->generateCaptchaCode($this->fixedIdent(), $rand);
69         $secret = $this->encrypt($rand);
131         $rand = $this->decrypt($field_sec);
134             $code = $this->generateMath($this->fixedIdent(), $rand);
139             $code = $this->generateCaptchaCode($this->fixedIdent(), $rand);
146             $rand === false ||
149             !(new FileCookie($this->fixedIdent(), $rand))->check()
193     protected function generateMagicCode($ident, $rand)  argument
196         $rand *= 0xFFFFF; // bitmask from the random number
197         $comb = (int)$rand ^ $ident; // combine both values
210     public function generateCaptchaCode($ident, $rand)  argument
212         $numbers = $this->generateMagicCode($ident, $rand);
232     protected function generateMath($ident, $rand)  argument
234         $numbers = $this->generateMagicCode($ident, $rand);