build_signature($request, $consumer, $token); // Check for zero length, although unlikely here if (strlen($built) == 0 || strlen($signature) == 0) { return false; } if (strlen($built) != strlen($signature)) { return false; } // Avoid a timing leak with a (hopefully) time insensitive compare $result = 0; for ($i = 0; $i < strlen($signature); $i ++) { $result |= ord($built[$i]) ^ ord($signature[$i]); } return $result == 0; } }