<?
function generate_random($n){
$bytes = openssl_random_pseudo_bytes($n, $cstrong);
$hex   = bin2hex($bytes);
if($cstrong) return $hex;
else die('Error');
}

class E_userside {
    var $password;
    var $signup_salt;
    var $p;

    function createUniqueIV(){
    return generate_random(8);
    }

    function createUserSalt(){
      return generate_random(300);
    }

    function fetchPubKey(){
    $this->p=openssl_pkey_get_public(file_get_contents('publickey'));
    }


  function encrypt($message){
      $iv=$this->createUniqueIV();
      $dk=generate_random(32);
      $uk_ = $dk ^ $this->getuk();
      openssl_public_encrypt($dk, $dk_,$this->p);
      return base64_encode(serialize(array('cipher'=>openssl_encrypt ($message, 'aes192', $dk, false,$iv),'iv'=>$iv, 'uk_'=>$uk_, 'dk_'=>$dk_)));

  }

  function decrypt($result){
      $array=unserialize(base64_decode($result));
        $uk=$this->getuk();
        $dk=$array['uk_']^$uk;
        return openssl_decrypt ($array['cipher'], 'aes192', $dk, false,$array['iv']);
    }


}
######################ADMIN
class E_adminside {
    var $P;

    function createUniqueIV(){
    return generate_random(8);
    }

    function fetchPrivateKey(){
    $this->P=openssl_pkey_get_private(file_get_contents('privatekey'));
    }


  function encryptComment($message,$params){
    openssl_private_decrypt($params['dk_'], $dk,$this->P);
      $iv=$this->createUniqueIV();
      return array('cipher'=>openssl_encrypt ($message, 'aes192', $dk, false,$iv),'iv'=>$iv, 'uk_'=>$params['uk_'], 'dk_'=>$params['dk_']);

  }

  function decrypt($data){
        $array=unserialize(base64_decode($data));
        openssl_private_decrypt($array['dk_'], $dk,$this->P);
        return openssl_decrypt ($array['cipher'], 'aes192', $dk, false,$array['iv']);
    }


}
?>