I would like to encrypt and decrypt the get parameters in CodeIgniter.
I have written the following code:
<a href="<?php echo site_url('package?product='.$this->encrypt->encode('database').
'&price='.$this->encrypt->encode('5000')); ?>">BUY NOW</a>
For testing, this in my package.php view in which I have written the following:
echo $this->encrypt->decode($_GET['product']);
echo "<br/>";
echo $this->encrypt->decode($_GET['price']);
But when I click on the link, sometimes it shows both values, sometimes only one of the values and sometimes nothing...
This solves my problem:
Just create the below class in your library folder and name the file Encryption
then you can load it in our autoload.php
or directly in your controller. See an example:
$this->load->library('encryption'); //in controller
$autoload['libraries'] = array('database','encryption'); // In autoload.php
The Encryption class:
class Encryption {
var $skey = "MUHAMMAD";
public function safe_b64encode($string) {
$data = base64_encode($string);
$data = str_replace(array('+', '/', '='), array('-', '_', ''), $data);
return $data;
}
public function safe_b64decode($string) {
$data = str_replace(array('-', '_'), array('+', '/'), $string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
return base64_decode($data);
}
public function encode($value) {
if (!$value) {
return false;
}
$text = $value;
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->skey, $text, MCRYPT_MODE_ECB, $iv);
return trim($this->safe_b64encode($crypttext));
}
public function decode($value) {
if (!$value) {
return false;
}
$crypttext = $this->safe_b64decode($value);
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->skey, $crypttext, MCRYPT_MODE_ECB, $iv);
return trim($decrypttext);
}
}
And to use the library class after loading it, see below:
$encrypt = $this->encryption->encode('Anything...');
$decrypt = $this->encryption->decode($encrypt);