Jun
27

PHP Encrypt/Decrypt: Simple class to encrypt url data

Author ZeeShaN    Category Codeigniter, PHP, Web Development     Tags

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.

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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

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

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Written by ZeeShaN

ZeeShaN RasooL is a web developer who loves to work in latest technologies to create more interactive dynamic and beautiful web pages.







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Zeeshan Rasool

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Lahore - Pakistan

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