Notice from the top of thirdparty/crypto/sha256.h and sha256.cpp (ReXGlue SDK), copied verbatim:

// //////////////////////////////////////////////////////////
// sha256.h
// Copyright (c) 2014,2015 Stephan Brumme. All rights reserved.
// see http://create.stephan-brumme.com/disclaimer.html
//
// Altered for use in Xenia. Licensed under zlib license when acquired.
