php 解密小程序獲取unionid

小程序代碼

php代碼

public function login2()
    {
        $post = input();
        if (!empty($post)) {
            $appid = $this->wxappid;
            $secret = $this->wxsecret;
            if(isset($post['code']))                $code        = $post['code'];
            if(isset($post['iv']))                  $iv          = $post['iv'];
            if(isset($post['rawData']))             $rawData     = $post['rawData'];
            if(isset($post['signature']))           $signature   = $post['signature'];
            if(isset($post['encryteData']))       $encryptedData = $post['encryteData'];
            $url = "https://api.weixin.qq.com/sns/jscode2session?appid=" . $appid . "&secret=" . $secret . "&js_code=" . $code . "&grant_type=authorization_code";
            $weixin = file_get_contents($url);
            $jsondecode = json_decode($weixin);
            $res = get_object_vars($jsondecode);
            $sessionKey = $res['session_key'];//取出json裏對應的值
　　　　　　　　// 驗證簽名
            $signature2 = sha1(htmlspecialchars_decode($rawData) . $sessionKey);
            if ($signature2 !== $signature) return json("signNotMatch");

            $data = [];

            $errCode = $this->decryptData($encryptedData, $iv, $sessionKey, $data);            if ($errCode == 0) {                return $data;            } else {                return json('獲取失敗');            }        }    }    public function decryptData( $encryptedData, $iv,$sessionKey, &$data )    {        if (strlen($sessionKey) != 24) {            return json('sessionKey錯誤');        }        $aesKey=base64_decode($sessionKey);        if (strlen($iv) != 24) {            return json('iv錯誤');        }        $aesIV=base64_decode($iv);        $aesCipher=base64_decode($encryptedData);        $result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);        $dataObj=json_decode( $result );        if( $dataObj  == NULL )        {            return json('IllegalBuffer錯誤');        }        if( $dataObj->watermark->appid != $this->wxappid )        {            return json('IllegalBuffer錯誤');        }        $data = $result;        return  $data;    }