<?
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']);
	}
		

} 
?>