This implementation of the NIST Secure Hash Algorithm, is derived fromwork by Uwe Hollerbach <uh@alumni.caltech.edu>, which in turn was derivedfrom Peter C. Gutmann's implementation as found in Applied Cryptographyby Bruce Schneier.Other parts of the library are covered by the following licence:Copyright (C) 1995, 1996 Systemics Ltd (http://www.systemics.com/)All rights reserved.This library and applications are FREE FOR COMMERCIAL AND NON-COMMERCIAL USEas long as the following conditions are adhered to.Copyright remains with Systemics Ltd, and as such any Copyright noticesin the code are not to be removed.  If this code is used in a product,Systemics should be given attribution as the author of the parts used.This can be in the form of a textual message at program startup orin documentation (online or textual) provided with the package.Redistribution and use in source and binary forms, with or withoutmodification, are permitted provided that the following conditionsare met:1. Redistributions of source code must retain the copyright   notice, this list of conditions and the following disclaimer.2. Redistributions in binary form must reproduce the above copyright   notice, this list of conditions and the following disclaimer in the   documentation and/or other materials provided with the distribution.3. All advertising materials mentioning features or use of this software   must display the following acknowledgement:   This product includes software developed by Systemics Ltd (http://www.systemics.com/)      THIS SOFTWARE IS PROVIDED BY SYSTEMICS LTD ``AS IS'' AND   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF   SUCH DAMAGE.   The licence and distribution terms for any publically available version or   derivative of this code cannot be changed.  i.e. this code cannot simply be   copied and put under another distribution licence   [including the GNU Public Licence.]