AWS S3 PHP download decrypted object

I am downloading object using PHP SDK and saving it local. But when i opens file that have raw/encrypted data. How i can download file with original content. File is csv format. Need to fix it urgently.

`

$objects = $s3->getIterator('ListObjects', array('Bucket' => $bucket, "Prefix" => "my folder path"));

foreach ($objects as $object) {
   $objkey = $object['Key'];
   $filename = basename($objkey);
  $result = $s3->getObject(array(
                    'Bucket' => $bucket,
                    'Key' => $objkey,
                  'SaveAs' => $uploadPath . "/" . $filename
                ));


}`