PHP Encrypt/Decrypt: Simple class to encrypt url data

Author: Zeeshan Rasool | Last updated on July 1st, 2010

Codeigniter, PHP, Web Development

Encryption is useful where critical data is being transferred in url. I have found a simple and secure encryption class with some changes to make it fit for new users. You can use it in Codeigniter websites as well. Just copy it in application/libraries directory and use it in other libraries style.
Here is the code for encryption class.

class Encryption {
	var $skey 	= "SuPerEncKey2010"; // you can change it
	
    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);
    }
}

class Encryption {

var $skey = "SuPerEncKey2010"; // you can change it

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);

}

You need to include this class any where in to make your data encrypted with simple encode() or decode() functions.
If you are using it in Codeigniter then use like this

$this->encrypt->encode('Your data');
$this->encrypt->decode('Your encrypted data');

1 2	$this->encrypt->encode('Your data'); $this->encrypt->decode('Your encrypted data');

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Thank you. :)
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suga priya

Thank you so much
Engin

I’ve been struggling for the last 2 hours just to find a simple encryption code and none of them worked except yours. Thank you very much!
titto vedder

Hi, master, how to implementing this code in codeigniter 3 ?