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molimo odgovorite:"); DEFINE('MATHGUARD_FIELD_ANSWER',md5("codegravity_answer".(date("d")*date("W")*date("W")))); // change this immediatelly to something else. eg. myanswer123 DEFINE('MATHGUARD_FIELD_CODE',md5("codegravity_code".(date("d")*date("W")))); // change this immediatelly to something else. eg. mysecretcodefield /** SETTINGS - you can easily modify these constants **/ class MathGuard { /** you can also modify $output to your needs **/ function produceOutput($prime) { $a = rand() % 10; // generates the random number $b = rand() % 10; // generates the random number $code = MathGuard :: generateCode($a, $b, $prime); // please don't remove the backlink, thank you $output = "" . "
" . MATHGUARD_QUESTION . " * \n\n" . MathGuard :: renderExpression($a, $b) . "
"; return $output; } /** function that converts the decimal number to line of 3 random characters * @param $dec decimal number that is being converted to line of 3 random characters * */ function decToBin($dec) { $pattern = "123456789ABCDEFGHIJKLMNOPQRTSTUWXYZ"; //without zero, it was interpreted as an empty space $output = " "; $i = 0; do { if ($dec % 2) { $rand = rand() % 34; $output { 2 - $i } = $pattern { $rand }; } else { $output { 2 - $i } = " "; } $dec = (int) ($dec / 2); $i++; } while ($dec > 0); $output = str_replace(" ", " ", $output); return $output; } /** function that renders a final 3x5 matrix consisting of random characters * @param $a random number a that renders to the 3x5 matrix consisting of random characters * @param $b random number b that renders to the 3x5 matrix consisting of random characters * */ function renderExpression($a, $b) { $number = array ( array ( 7, 5, 5, 5, 7 ), array ( 2, 6, 2, 2, 7 ), array ( 7, 1, 7, 4, 7 ), array ( 7, 1, 7, 1, 7 ), array ( 4, 5, 7, 1, 1 ), array ( 7, 4, 7, 1, 7 ), array ( 7, 4, 7, 5, 7 ), array ( 7, 1, 1, 1, 1 ), array ( 7, 5, 7, 5, 7 ), array ( 7, 5, 7, 1, 7 ) ); $plus = array ( 0, 2, 7, 2, 0 ); $eq = array ( 0, 7, 0, 7, 0 ); $output = "\n\n"; for ($line = 0; $line < 5; $line++) { $output .= MathGuard :: decToBin($number[$a][$line]) . "   " . MathGuard :: decToBin($plus[$line]) . "   " . MathGuard :: decToBin($number[$b][$line]) . "   " . MathGuard :: decToBin($eq[$line]) . "\n"; $output = str_replace("0", " ", $output); } return nl2br($output); } /** A main hashing function: concat of user's answer, hour and the additional prime number (default 37) */ function encode($input, $prime) { return md5($input . date("H-d") . $prime); } /** This function generates the hash code from the two numbers * @param $a first number * @param $b second sumber * @param $prime additional number to encode with * */ function generateCode($a, $b, $prime) { $code = MathGuard :: encode($a + $b, $prime); return $code; } /** This function checks whether the answer and generated security code match * @param $mathguard_answer answer the user has entered * @param $mathguard_code hashcode the mathguard has generated */ function checkResult($mathguard_answer, $mathguard_code, $prime = 37) { $mathguard_code = @$_POST[MATHGUARD_FIELD_CODE]; $mathguard_answer = @$_POST[MATHGUARD_FIELD_ANSWER]; // echo("prime; $prime, $mathguard_answer"); $result_encoded = MathGuard :: encode($mathguard_answer, $prime); if ($result_encoded == $mathguard_code) return true; else return false; } /** this function inserts the two math term into your form, the parameter is optional */ function insertQuestion($prime = 37) { //default prime is 37, you can change it when specifying the different parameter $output = MathGuard :: produceOutput($prime); echo $output; } /** this function returns math expression into your form, the parameter is optional * quite simmilar to insertQuestion, but returns the output as a text instead of echoing */ function returnQuestion($prime = 37) { //default prime is 37, you can change it when specifying the different parameter $output = MathGuard :: produceOutput($prime); return $output; } } ?>