code: public static boolean verifyRequestSignature(HttpServletRequest request, String secretKey) {
          return verifyRequestSignature(request, secretKey, System.currentTimeMillis());
      }
docs: Verifies the signature in an HttpServletRequest.
  
  @param request The HttpServletRequest to be verified
  @param secretKey The pre-shared secret key used by the sender of the request to create the signature
  
  @return true if the signature is correct for this request and secret key.