From:http://pajhome.org.uk/crypt/md5/md4src.html /* * A JavaScript implementation of the RSA Data Security, Inc. MD4 Message * Digest Algorithm, as defined in RFC 1320. * Version 2.1 Copyright (C) Jerrad Pierce, Paul Johnston 1999 – 2002. * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lo