Copyright (C) 2000, 2009, 2011, 2012 Neil Edelman
Uses HMAC-SHA-256 code Copyright (C) 2005 Olivier Gay, see Mac.c.

OSS Game is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with OSS Game (see gnu.txt.)  If not, see
<http://www.gnu.org/licenses/>.