Main author:
  Laurent Bercot <ska-skaware@skarnet.org>

Contributors:
  Eric Le Bihan <eric.le.bihan.dev@free.fr>

Thanks to:
  Dan J. Bernstein <djb@cr.yp.to>
  Jorge Almeida <jalmeida@math.ist.utl.pt>
  Olivier Brunel <jjk@jjacky.com>