encrypt.php

<?php 
function encrypt ($pwd, $data)
{
        $key[] = '';
        $box[] = '';
        $pwd_length = strlen($pwd);
        $data_length = strlen($data);
        for ($i = 0; $i < 256; $i++){
                $key[$i] = ord($pwd[$i % $pwd_length]);
                $box[$i] = $i;
        }
        for ($j = $i = 0; $i < 256; $i++){
                $j = ($j + $box[$i] + $key[$i]) % 256;
                $tmp = $box[$i];
                $box[$i] = $box[$j];
                $box[$j] = $tmp;
        }
        for ($a = $j = $i = 0; $i < $data_length; $i++)
        {
                $a = ($a + 1) % 256;
                $j = ($j + $box[$a]) % 256;

                $tmp = $box[$a];
                $box[$a] = $box[$j];
                $box[$j] = $tmp;

                $k = $box[(($box[$a] + $box[$j]) % 256)];
                $cipher .= chr(ord($data[$i]) ^ $k);
        }
        return $cipher;
}
function strToHex($string)
{
    $hex='';
    for ($i=0; $i < strlen($string); $i++)
    {
        $hex .= dechex(ord($string[$i]));
    }
    return $hex;
}
function isValidRequest(){
	return true;	
}

$text=$_GET["text"];
require_once "server/config/key.php";
$result=strToHex(encrypt("kkk",$text.$key_rand));
if (!isValidRequest())
	$result=str_shuffle($result);
?>	  
<?php echo $result?>