phpseclib/src/a25c82c8-14c2-40df-adae-f83.../code.php

137 lines
2.9 KiB
PHP

<?php
/**
* @package Joomla.Component.Builder
*
* @created 4th September, 2022
* @author Llewellyn van der Merwe <https://dev.vdm.io>
* @git Joomla Component Builder <https://git.vdm.dev/joomla/Component-Builder>
* @copyright Copyright (C) 2015 Vast Development Method. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace VDM\Joomla\Componentbuilder\Crypt;
use phpseclib3\Crypt\AES as BASEAES;
use phpseclib3\Exception\BadDecryptionException;
use VDM\Joomla\Componentbuilder\Crypt\Random;
use VDM\Joomla\Componentbuilder\Interfaces\Cryptinterface;
/**
* Class for Aes Encryption
*
* @since 3.2.0
*/
class Aes implements Cryptinterface
{
/**
* The Aes class
*
* @var BASEAES
* @since 3.2.0
*/
protected BASEAES $aes;
/**
* The Random class
*
* @var Random
* @since 3.2.0
*/
protected Random $random;
/**
* The block size
*
* @var int
* @since 3.2.0
*/
protected int $size = 256;
/**
* Constructor
*
* @param BASEAES $aes The Aes class
* @param Random $random The Random class
*
* @since 3.2.0
*/
public function __construct(BASEAES $aes, Random $random)
{
$this->aes = $aes;
$this->random = $random;
// we set the length once
$this->aes->setKeyLength($this->size);
// enable padding
$this->aes->enablePadding();
}
/**
* Encrypt a string as needed
*
* @param string $string The string to encrypt
* @param string $key The encryption key
*
* @return string
* @since 3.2.0
**/
public function encrypt(string $string, string $key): string
{
// we get the IV length
$iv_length = (int) $this->aes->getBlockLength() >> 3;
// get the IV value
$iv = $this->random::string($iv_length);
// Load the IV
$this->aes->setIV($iv);
// set the password
$this->aes->setPassword($key, 'pbkdf2', 'sha256', 'VastDevelopmentMethod/salt');
// encrypt the string, and base 64 encode the result
return base64_encode($iv . $this->aes->encrypt($string));
}
/**
* Decrypt a string as needed
*
* @param string $string The string to decrypt
* @param string $key The decryption key
*
* @return string|null
* @since 3.2.0
**/
public function decrypt(string $string, string $key): ?string
{
// we get the IV length
$iv_length = (int) $this->aes->getBlockLength() >> 3;
// remove base 64 encoding
$string = base64_decode($string);
// get the IV
$iv = substr($string, 0, $iv_length);
// remove the IV
$string = substr($string, $iv_length);
// set the IV
$this->aes->setIV($iv);
// set the password
$this->aes->setPassword($key, 'pbkdf2', 'sha256', 'VastDevelopmentMethod/salt');
try {
return $this->aes->decrypt($string);
} catch (\Exception $ex) {
return null;
}
}
}