flysystem encryption adapter

Adapter.php

<?php
namespace MStaack\EncryptedAdapter;

use League\Flysystem\AdapterDecorator\DecoratorTrait;
use League\Flysystem\AdapterInterface;
use League\Flysystem\Config;
use phpseclib\Crypt\AES;

/**
 * Class EncryptionDecorator
 */
class EncryptionDecorator implements AdapterInterface
{
    use DecoratorTrait;

    /**
     * @var AdapterInterface
     */
    protected $adapter;

    /**
     * @var
     */
    protected $cipher;

    /**
     * @param AdapterInterface $adapter
     */
    public function __construct(AdapterInterface $adapter, $encryptionKey = null)
    {
        $this->adapter = $adapter;

        $this->cipher = new AES();
        $this->cipher->setKey($encryptionKey);
    }

    /**
     * @return AdapterInterface
     */
    protected function getDecoratedAdapter()
    {
        return $this->adapter;
    }


    /**
     * @param string $path
     * @param string $contents
     * @param Config $config
     * @return array|false
     */
    public function write($path, $contents, Config $config)
    {

        $contents = base64_encode($this->cipher->encrypt($contents));

        return $this->getDecoratedAdapter()->write($path, $contents, $config);
    }

    /**
     * @param string $path
     * @param string $contents
     * @param Config $config
     * @return array|false
     */
    public function update($path, $contents, Config $config)
    {

        $contents = base64_encode($this->cipher->encrypt($contents));

        return $this->getDecoratedAdapter()->update($path, $contents, $config);
    }


    /**
     * @param string $path
     * @return array|false
     */
    public function read($path)
    {
        $response = $this->getDecoratedAdapter()->read($path);

        $response['contents'] = $this->cipher->decrypt(base64_decode($response['contents']));

        return $response;
    }

}