微信支付退款成功回调结果的解密

微信退款成功后，会向用户指定的地址发送一个请求，参数是微信退款的状态，成功，失败都有回复，但是数据是加密的

网上的很多说解密的，但是那些解密的函数已数被php弃用了

//可逆加密
function encrypt($data, $key) {
    $prep_code = serialize($data);
    $block = mcrypt_get_block_size('des', 'ecb');
    if (($pad = $block - (strlen($prep_code) % $block)) < $block) {
        $prep_code .= str_repeat(chr($pad), $pad);
    }
    $encrypt = mcrypt_encrypt(MCRYPT_DES, $key, $prep_code, MCRYPT_MODE_ECB);
    return base64_encode($encrypt);
}

//可逆解密
function decrypt($str, $key) {
    $str = base64_decode($str);
    $str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
    $block = mcrypt_get_block_size('des', 'ecb');
    $pad = ord($str[($len = strlen($str)) - 1]);
    if ($pad && $pad < $block && preg_match('/' . chr($pad) . '{' . $pad . '}$/', $str)) {
        $str = substr($str, 0, strlen($str) - $pad);
    }
    return unserialize($str);
}

上面的 mcrypt类的函数都被弃用了，

下面是微信退款时的请求

public function refund_result(){
        $xml = file_get_contents('php://input');
        $refundObj = simplexml_load_string($xml,'SimpleXMLElement',LIBXML_NOCDATA);
        //退款回调
        if($refundObj->return_code == "SUCCESS"){
            $req_info = $refundObj->req_info;
            $req = RoutineRefund::decipheringReqInfo($req_info);
            if($req["refund_status"] == "SUCCESS"){
                //表示退款成功
                $status = "succ";

                //如果退款成功，给用户发送模板消息
                $order_id = $req["out_trade_no"];
                $order = StoreOrder::where("order_id",$order_id)->find();
                //如果退款是普通订单，则发普通退款消息，如果是拼团的则发拼团退款
                if($order->combination_id){
                    $formId = RoutineFormId::getFormIdOne($order->uid);
                    $assemble = Assemble::find($order->pink_id);
                    $assemble_product = AssembleProduct::find($assemble->ass_id);
                    $product = StoreProduct::find($assemble_product->product_id);
                    $store = Store::find($assemble_product->store_id);
                    $assemble_coming_count = AssembleComing::where("a_id",$order->pink_id)->where("is_refund",0)->count();
                    $data['keyword1']['value']=$product->getData("store_name");
                    $data['keyword2']['value']=$assemble->createtime;
                    $data['keyword3']['value']= $assemble_coming_count;
                    $data['keyword4']['value']="拼团超时";
                    $data['keyword5']['value']=$assemble_product->member_num;
                    $data['keyword6']['value']=$store->getData("name");
                    $data['keyword7']['value']=$order->getData("pay_price");

                    RoutineFormId::delFormIdOne($formId);
                    RoutineTemplateService::sendTemplate(WechatUser::getOpenId($order->uid),RoutineTemplateService::setTemplateId(RoutineTemplateService::ASSEMBLE_FAIL),'',$data,$formId);
                }else{
                    //暂时没有

                }




            }else if($req["refund_status"] == "CHANGE"){
                //表示退款异常
                $status = "change";

            }else if($req["refund_status"] == 'REFUNDCLOSE'){
                //表示退款关闭
                $status = "refundclose";
            }

            Db::name("order_refund")->insert([
                "order_id"=>$req["out_trade_no"],
                "refund_status"=>$status ?:"",
                "createtime"=>date("Y-m-d H:i:s"),
            ]);
            return ' ';

            //最终都要给微个返回一个成功的通知
        }
    }

这个里面就是官方推荐的解密方法

    //解密退款成功时，微信回调返回的信息
    public static function decipheringReqInfo($str){
        //微信商户key
        $key = self::options()['pay_routine_key'];
        $str = base64_decode($str);
        $xml = openssl_decrypt($str,'aes-256-ecb',md5($key),OPENSSL_RAW_DATA);
        return json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    }