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

Thanks to:
  Dan J. Bernstein <djb@cr.yp.to>
  Vallo Kallaste <kalts@estpak.ee>
  A. Wilcox <AWilcox@Wilcox-Tech.com>
  Andrew Ayer <andrew@agwa.name>