This is a simple helper I wrote that uses the CI encryption library to encrypt/decrypt strings and arrays. Save it as encryption in application/helpers.
Example to encrypt and decrypt a string with a given key:
$this->load->helper('encryption');
$encrypted = fail_encrypt('some text', 'mysecretkey');
$text = fail_decrypt($encrypted, 'mysecretkey');
echo("$text");
The following _array versions take an indexed array as the first parameter and only encrypt/decrypt the array keys of $data that match the values in $keys.
e.g.
// some data with some values to encrypt
$data = array(
'name' => 'Sheikh Ahmed',
'age' => 64,
'password' => 'fail',
'secret' => 'www.failme.net'
);
// encrypt the keys in $data that match these values
$keys = array('password', 'secret');
// use this key of encryption
$ekey = 'fail';
fail_encrypt_array($data, $keys, $ekey);
// show encrypted array
var_dump($data);
// decrypt the encrypted array
fail_decrypt_array($data, $keys, $ekey)
var_dump($data);
The helper code:
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* Fail Encryption Helpers
*
* @package Fail
* @subpackage Helpers
* @category Helpers
* @author Vijay Mahrra <vijay@yoyo.org>
* @link http://www.designbyfail.com/
*/
// ------------------------------------------------------------------------
/**
* Encrypt Text
*
* Encrypts a string and returns an encoded version
*
* @access public
* @param text string the text to encrypt
* @param ekey string the encryption key to use
* @param cipher cipher to be used
* @return string
*/
function &fail;_encrypt($text, $ekey = null, $cipher = MCRYPT_BLOWFISH)
{
$CI =& get_instance();
$CI->load->library('encrypt');
$CI->encrypt->set_cipher($cipher);
$text = trim($text);
if (empty($text)) {
$return = '';
return $return;
}
$encrypted = (empty($ekey)) ? $CI->encrypt->encode($text) : $CI->encrypt->encode($text, $ekey);
return $encrypted;
}
// ------------------------------------------------------------------------
/**
* Decrypt Text
*
* Decrypts an encoded string and returns the original text
*
* @access public
* @param text string the text to decrypt
* @param ekey string the encryption key to use
* @param cipher cipher to be used
* @return string
*/
function &fail;_decrypt($encrypted, $ekey = null, $cipher = MCRYPT_BLOWFISH)
{
$CI =& get_instance();
$CI->load->library('encrypt');
$CI->encrypt->set_cipher($cipher);
if (empty($encrypted)) {
$return = '';
return $return;
}
$decrypted = (empty($ekey)) ? $CI->encrypt->decode($encrypted) : $CI->encrypt->decode($encrypted, $ekey);
return $decrypted;
}
// ------------------------------------------------------------------------
/**
* Decrypt Array
*
* Decrypts an array
*
* @access public
* @param data array the array with encrypted values
* @param keys array the values here contain the array keys in $data to decrypt
* @param text string the text to decrypt
* @param ekey string the encryption key to use
* @param cipher cipher to be used
* @return string
*/
function fail_decrypt_array(&$data, $keys, $ekey = null, $cipher = MCRYPT_BLOWFISH)
{
if (!is_array($data)) {
return false;
}
// decrypt all fields if no fields specified
if (count($keys) == 0) {
foreach ($data as $k => $v) {
$data[$k] = fail_decrypt($data[$k], $ekey, $cipher);
}
} else {
// decrypt only the fields specified
foreach ($keys as $k) {
if (!array_key_exists($k, $data)) continue;
$data[$k] = fail_decrypt($data[$k], $ekey, $cipher);
}
}
return true;
}
// ------------------------------------------------------------------------
/**
* Encrypt Array
*
* Encrypts an array
*
* @access public
* @param data array the array with encrypted values
* @param keys array the values here contain the array keys in $data to encrypt
* @param text string the text to decrypt
* @param ekey string the encryption key to use
* @param cipher cipher to be used
* @return string
*/
function fail_encrypt_array(&$data, $keys = array(), $ekey = null, $cipher = MCRYPT_BLOWFISH)
{
if (!is_array($data)) {
return false;
}
// encrypt all fields if no fields specified
if (count($keys) == 0) {
foreach ($data as $k => $v) {
$data[$k] = fail_encrypt($data[$k], $ekey, $cipher);
}
} else {
// encrypt only fields specified
foreach ($keys as $k) {
if (!array_key_exists($k, $data)) continue;
$data[$k] = fail_encrypt($data[$k], $ekey, $cipher);
}
}
return true;
}
// ------------------------------------------------------------------------
?>