Copyright (C) 2013-2014 David Mazieres Distribution permitted under the GNU General Public License (GPL) version 2 or later. Acceptable versions of this license are available at the following URLs: http://www.gnu.org/licenses/gpl-2.0.html http://www.gnu.org/licenses/gpl-3.0.html If the Free Software Foundation publishes a higher-numbered GPL license, you may at your option distribute this software under the terms of that license as well. Furthermore, the copyright holder grants you the right to classify the collection of crypgtographic hash functions in OpenSSL's libcrypto as a "system library" and a "major component of the operating system."