Instagram如何在php中验证X-Hub-Signature

什么是在 PHP中验证X-Hub-Signature的正确方法？

我试过了

$xHubSignature = $request->getHeader('X-Hub-Signature');
$postdata = file_get_contents("PHP://input");
$body = $request->getRawBody( );
$check = sha1('mysecret'.$postdata);

但它不起作用.

hash_hmac( 'sha1',$postdata,'mysecret')

感谢Payom Dousti

https://groups.google.com/forum/?fromgroups=#!topic/instagram-api-developers/7nKyipJENdI