In speed, track number of invalid generated signatures and print once
In speed, track number of invalid generated signatures and print once

Otherwise this spams the output when something goes wrong.

randombit/botan,webmaster128/botan,webmaster128/botan,webmaster128/botan,randombit/botan,randombit/botan,randombit/botan,webmaster128/botan,randombit/botan,webmaster128/botan