encryption-class
Code (php)
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<?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();
*/
?>
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();
*/
?>