<?PHP
$cry = array(0=>5,1=>3,2=>9,3=>2,4=>7,5=>6,6=>1,7=>8,8=>0,9=>4);
function enc($e,$cry,$k){
if(strlen($e)>10)die("max encrypt digits is 10");
if(strlen($e) >= $k)die("Request encrypt must be lesser than its length");
if(strlen($e) ==0)die("must pass some numbers");
$ct = $e;
$jump = ($k-1)-strlen($e);
$ency = $cry[(strlen($e))];
$n = 0;
for($a=0;$a<$k-1;$a++){
if($jump > 0){
if($a%2 == 1){
$ency .=rand(0,9);
$jump -=1;
}else{
if(isset($ct[$n])){
$ency.=$cry[$ct[$n]];
$n++;
}else{
$ency .=rand(0,9);
$jump -=1;
}
}
}else{
$ency.= $cry[$ct[$n]];
$n++;
}
}
return $ency;
}
function dec($e,$cry){
//$decy = substr($e,6);
$ar = str_split($e,1);
$len = array_search($ar[0], $cry);
$jump = strlen($e)-($len+1);
$val = "";
for($i=1;$i<strlen($e);$i++){
if($i%2==0){
if($jump >0){
//$val .=array_search($e[$i], $cry);
$jump--;
}else{
$val .=array_search($e[$i], $cry);
}
}else{
if($len > 0){
$val .=array_search($e[$i], $cry);
$len--;
}else{
$jump--;
}
}
}
return $val;
}
if(isset($_GET["n"])){
$n = $_GET["n"];
}else{
$n = 1000;
}
$str = 1253;
$str = enc($str,$cry,15);
echo "Encerypted Value : ".$str ."<br/>";
$str = dec($str,$cry);
echo "Decrypted Value : ".$str ."<br/>";
?>