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Current Path : /home/vmanager/www/common/components/
Linux eb5096292c53 5.15.0-102-generic #112-Ubuntu SMP Tue Mar 5 16:50:32 UTC 2024 x86_64
Current File : /home/vmanager/www/common/components/EncriptionEngine.php
<?php

namespace common\components;

class EncriptionEngine 
{
    
    /**
     * Tryb szyfrowania
     */
    const CRYPT_MODE = 'ctr';
    
    /**
     * Klucz prywatny.
     * 
     * @var string 
     */
    private $_encryptionKey;
    
    /**
     * Wektor inicjalizacyjny silnika szyfrującego.
     * 
     * @var string 
     */
    private $_initializationVector;
    
    /**
     * Statyczna instancja obiektu EncriptionEngine.
     * 
     * @var EncriptionEngine
     */
//    private static $_instance = null;
    
    /**
     * Zwraca zawsze ten sam obiekt (singleton).
     * 
     * @return EncriptionEngine 
     */
//    public static function getInstance()
//    {
//            if (self::$_instance === null) {
//                    self::$_instance = new self;
//            }
//            return self::$_instance;
//    }
    
    /**
     * Konstruktor
     * 
     * Inicjalizuje klucz prywatny oraz wektor inicjalizujący pobierając je z obiektu konfiguracyjnego aplikacji.
     * 
     * @return void
     */
    public function __construct($encryptionKey, $initializationVector) 
    {
        $this->_encryptionKey = $encryptionKey;
        $this->_initializationVector = $initializationVector;
    }
    
    public function encrypt($text)
    {
        if(PHP_VERSION_ID < 70100 && function_exists('mcrypt_encrypt')) {
            return base64_encode(
                mcrypt_encrypt(
                    MCRYPT_RIJNDAEL_256, 
                    $this->_encryptionKey, 
                    $text, 
                    self::CRYPT_MODE, 
                    $this->_initializationVector
                )           
            );
        } elseif(function_exists('sodium_crypto_secretbox')) {
            $nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);

            $encryptedText = base64_encode($nonce.sodium_crypto_secretbox($text, $nonce, $this->_encryptionKey));
            sodium_memzero($text);
            
            return $encryptedText;
        } else {
            throw new \Exception('No mcrypt / sodium extension');
        }
    }

    public function decrypt($text)
    {
        if(PHP_VERSION_ID < 70100 && function_exists('mcrypt_encrypt')) {
            return mcrypt_decrypt(
                MCRYPT_RIJNDAEL_256, 
                $this->_encryptionKey, 
                base64_decode($text), 
                self::CRYPT_MODE, 
                $this->_initializationVector
            );
        } elseif(function_exists('sodium_crypto_secretbox')) {
            $decoded = base64_decode($text);
            if($decoded === false || (mb_strlen($decoded, '8bit') < (SODIUM_CRYPTO_SECRETBOX_NONCEBYTES + SODIUM_CRYPTO_SECRETBOX_MACBYTES))) {
                return false;
            }
            $nonce = mb_substr($decoded, 0, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '8bit');
            $ciphertext = mb_substr($decoded, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit');

            $encryptedText = sodium_crypto_secretbox_open($ciphertext, $nonce, $this->_encryptionKey);
            if($encryptedText === false) {
                return false;
            }
            sodium_memzero($ciphertext);
            
            return $encryptedText;
        } else {
            throw new Exception('No mcrypt / sodium extension');
        }
            
    }
}
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