php - `SignatureDoesNotMatch` Response from AWS of Alexa Top Sites Service -

i referring alexa top sites developer guide , using their sample codes, both php , ruby. getting following signaturedoesnotmatch error:

<?xml version="1.0"?> <response><errors><error><code>signaturedoesnotmatch</code><message>the request signature calculated not match signature provided. check aws secret access key , signing method. consult service documentation details. </message></error></errors><requestid>28c6b028-c4b6-66a2-f5d8-70d8dc21b8f8</requestid> </response> 

i tried 2 different access keys same user , signed alexa web information service, no luck. tried scripts on both mac os 10.9 , 10.10, time settings set automatically updated.

in php code part generates signature:

/**  * generates signature per rfc 2104  *  * @param string $queryparams query parameters use in creating signature  * @return string             signature  */ protected function generatesignature($queryparams) {     $sign = "get\n" . strtolower(self::$servicehost) . "\n/\n". $queryparams;     echo "string sign: \n" . $sign . "\n\n";     $sig = base64_encode(hash_hmac('sha256', $sign, $this->secretaccesskey, true));     return rawurlencode($sig); } 

i not sure doing wrong.

i figured out that. root aws user able make request not iam user created. guess root user has access alexa service not iam user.