note 93798 deleted from book.mcrypt by thiago
| From: | thiago@php.net | Date: | Wed, 30 Sep 2009 06:31:09 +0000 |
| Subject: | note 93798 deleted from book.mcrypt by thiago | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-161163@lists.php.net to get a copy of this message | ||
Note Submitter: sudhir dot vis at gmail dot com
----
<?php
/**
* standalone class for Encryption
*
* Features :
* This class facilitates encoding data to pass between two can be used for
* encoding & decoding for cookie value or url param.
*
* @author sudhir vishwakarma <sudhir.vis@gmail.com>
* @copyright Sudhir Vishwakarma
*
* @version 0.1 27102008
*
*/
class Encryption {
/**
* Set any difficult Key for guessing
*
* @access public
*/
var $skey = "-_-donthackit-_-";
/**
* This makes url or cookie value safe after encrypting any value
*
* @access public
*/
public function safe_b64encode($string) {
$data = base64_encode($string);
$data =
str_replace(array('+','/','='),array('-','_',''),$data);
return $data;
}
/**
* This makes url or cookie value safe after decrypting any value
*
* @access public
*/
public function safe_b64decode($string) {
$data =
str_replace(array('-','_'),array('+','/'),$string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
return base64_decode($data);
}
/**
* mcrypt libreary required
*
* @access public
*/
public function enc($value){
if(!$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($crypttext));
}
/**
* mcrypt libreary required
*
* @access public
*/
public function dec($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);
}
}
?>
Example
<?php
//This class facilitates encoding data to pass between two can be used for
//encoding & decoding for cookie value or url param.
require_once "Encryption.class.php";
$oEncryption = new Encryption;
echo "Encoded Value: ".$oEncryption->enc("sudhir");
echo "<br/>";
echo "Decoded Value: ".$oEncryption->dec($oEncryption->enc("sudhir"));
?>