<?php
/**
 * Created by PhpStorm.
 * User: net15
 * Date: 31/12/2017
 * Time: 16:21
 */

namespace FileManagerBundle\Service;


class FileItemCrypto
{

    /**
     * @param $source
     * @param $destination
     * @param $passphrase
     * @param null $stream
     */
    public function encrypt_file($source,$destination,$passphrase,$stream=NULL) {
        // $source can be a local file...
        if($stream) {
            $contents = $source;
            // OR $source can be a stream if the third argument ($stream flag) exists.
        }else{
            $handle = fopen($source, "rb");
            $contents = fread($handle, filesize($source));
            fclose($handle);
        }

        $iv = substr(md5("\x1B\x3C\x58".$passphrase, true), 0, 8);
        $key = substr(md5("\x2D\xFC\xD8".$passphrase, true) . md5("\x2D\xFC\xD9".$passphrase, true), 0, 24);
        $opts = array('iv'=>$iv, 'key'=>$key);
        $fp = fopen($destination, 'wb') or die("Could not open file for writing.");
        stream_filter_append($fp, 'mcrypt.tripledes', STREAM_FILTER_WRITE, $opts);
        fwrite($fp, $contents) or die("Could not write to file.");
        fclose($fp);

    }

    /**
     * @param $file
     * @param $passphrase
     * @return bool|resource
     */
    public function decrypt_file($file,$passphrase) {

        $iv = substr(md5("\x1B\x3C\x58".$passphrase, true), 0, 8);
        $key = substr(md5("\x2D\xFC\xD8".$passphrase, true) .
            md5("\x2D\xFC\xD9".$passphrase, true), 0, 24);
        $opts = array('iv'=>$iv, 'key'=>$key);
        $fp = fopen($file, 'rb');
        stream_filter_append($fp, 'mdecrypt.tripledes', STREAM_FILTER_READ, $opts);

        return $fp;
    }
}