Encryption class

<?php

class secure_data
{

// this function is the constructor for our class.
function open_module(){
	
	$this->td = mcrypt_module_open('rijndael-256', '', 'ofb', '');
	$this->iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($this->td), MCRYPT_RAND);
	$this->iv = substr(md5($this->iv), 0, mcrypt_enc_get_iv_size($this->td));
	$this->ks = mcrypt_enc_get_key_size($this->td);
	
}


// this function encrypt's only input data
function encrypt($key,$data){
	
	$this->ori_data = $data;
	
	$this->key = substr(md5($key), 0, $this->ks);
	
	mcrypt_generic_init($this->td, $this->key, $this->iv);
	
	$this->data = mcrypt_generic($this->td, $data);
	
}


// this function encrypt's only files
function encrypt_file($key,$filename){
	
	$this->fp = fopen($filename,"r");
	
	$file_content ="";
	while (!feof($this->fp)){
		$file_content .= fread($this->fp, 8192);
	}
	
	$this->ori_data = $file_content;
		
	$this->key = substr(md5($key), 0, $this->ks);
	
	mcrypt_generic_init($this->td, $this->key, $this->iv);
	
	$this->data = mcrypt_generic($this->td, $file_content);
	
	
	$this->fpn = fopen($filename.".safe","w");
	
	fwrite($this->fpn,$this->data);
	
	
}


// decript data
function decrypt($key,$data,$iv){
	
	mcrypt_generic_init($this->td, $key, $iv);
	
	$this->data = mdecrypt_generic($this->td, $data);
	
}


// decrypt encrypted file
function decrypt_file($key,$filename,$iv){
	
	$this->fp = fopen($filename,"r");
	
	$file_content ="";
	while (!feof($this->fp)){
		$file_content .= fread($this->fp, 8192);
	}
	
	mcrypt_generic_init($this->td, $key, $iv);
	
	$this->data = mdecrypt_generic($this->td, $file_content);
	
	
	$filename = str_replace(".safe","",$filename);
	$this->fpn = fopen($filename,"w");
	
	fwrite($this->fpn,$this->data);
	
}


// verify's if the data original data is different from the encrypted data
function verify(){
	
	if($this->ori_data != $this->data){
		return true;
	}else{
		return false;
	}
	
}

	
function base64_encode(){
	
	$this->data = base64_encode($this->data);
	
}


function base64_decode(){
	
	$this->data = base64_decode($this->data);
	
}


// returns the key used for encryption
function get_key(){
	
	return $this->key;
	
}


// returns intilization vector
function get_iv(){
	
	return $this->iv;
	
}


// this returns current data
function get_data(){
	
	return $this->data;
	
}


// We dont need to close the module
function close_module(){
	
	mcrypt_generic_deinit($this->td);
	mcrypt_module_close($this->td);
	
}

// end class
}

/* this is just a example
$secure = new secure_data;
$secure->open_module();
$secure->encrypt_file("dunno","test.png");
$secure->decrypt_file($secure->get_key(),"test.png.safe",$secure->get_iv());
echo $secure->get_key();
echo $secure->get_iv();
$secure->close_module();
*/
?>