<?php
/**
 * Created by PhpStorm.
 * User: Bear
 * Date: 2019/1/15
 * Time: 上午10:02
 */

namespace app\common\service;


use think\Config;

class DesService extends BaseService
{
    private static $self;

    /**
     * @var string 加密key
     */
    private $des_key;

    /**
     * @var string 加密向量
     */
    private $des_iv;

    const METHOD = 'AES-128-CBC';

    public static function instance()
    {
        if (self::$self == NULL) {
            self::$self = new self();
            self::$self->des_key = Config::get('app_encode_key');
            self::$self->des_iv = Config::get('app_encode_iv');
        }

        return self::$self;
    }

    /**
     * @param $data
     * @return string
     */
    public function encode($data)
    {
        return openssl_encrypt($data, self::METHOD, $this->des_key, 0, $this->des_iv);
    }

    /**
     * @param $data
     * @return string
     */
    public function decode($data)
    {
        return openssl_decrypt($data, self::METHOD, $this->des_key, 0, $this->des_iv);
    }
}