<?php

//

///////////////////////////////////////////////////////

// Small AzDGCrypt class (you may reset this comments)

// Questions: (AzDG Support) <support@azdg.com>

///////////

// Purposes:

// Crypt passwords

///////////

// Example:

///////////////////////////////////////////////////////

// $keys = "Your_key"; // you must entered your key

///////////////////////////////////////////////////////

// $cr64 = new AzDGCrypt($keys);

// $e = $cr64->crypt($keys);

// echo "Crypted information = ".$e."<br>";

// $d = $cr64->decrypt($e);

// echo "Decrypted information = ".$d."<br>";

///////////////////////////////////////////////////////

// Test results:

// Machine: P1-233, 64 Ram (Free 78%), W98, apache 2.0.39

//          php 4.0.6 (class also work in php3)

// Key - 30 symbols (8-10 recommended):

////// $keys = "1234567890abcdefghjk@#$%^&*()!";

// Operations - 10 This Example algorithms

// Execute time ~ 0.1 sec

////////////////////////////////////////////////////////



class AzDGCrypt{

   var $k;

   function AzDGCrypt($m){

      $this->k = $m;

   }

   function ed($t) {

      $r = md5($this->k);

      $c=0;

      $v = "";

      for ($i=0;$i<strlen($t);$i++) {

         if ($c==strlen($r)) $c=0;

         $v.= substr($t,$i,1) ^ substr($r,$c,1);

         $c++;

      }

      return $v;

   }

   function crypt($t){

      srand((double)microtime()*1000000);

      $r = md5(rand(0,32000));

      $c=0;

      $v = "";

      for ($i=0;$i<strlen($t);$i++){

         if ($c==strlen($r)) $c=0;

         $v.= substr($r,$c,1) .

             (substr($t,$i,1) ^ substr($r,$c,1));

         $c++;

      }

      return base64_encode($this->ed($v));

   }

   function decrypt($t) {

      $t = $this->ed(base64_decode($t));

      $v = "";

      for ($i=0;$i<strlen($t);$i++){

         $md5 = substr($t,$i,1);

         $i++;

         $v.= (substr($t,$i,1) ^ $md5);

      }

      return $v;

   }

}

?>