## 4 MD5 message digest algorithm

The source code for the `md5` module contains the following notice:

      Copyright (C) 1999, 2002 Aladdin Enterprises.  All rights reserved.

      This software is provided 'as-is', without any express or implied
      warranty.  In no event will the authors be held liable for any damages
      arising from the use of this software.

      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute it
      freely, subject to the following restrictions:

      1. The origin of this software must not be misrepresented; you must not
         claim that you wrote the original software. If you use this software
         in a product, an acknowledgment in the product documentation would be
         appreciated but is not required.
      2. Altered source versions must be plainly marked as such, and must not be
         misrepresented as being the original software.
      3. This notice may not be removed or altered from any source distribution.

      L. Peter Deutsch
      ghost@aladdin.com

      Independent implementation of MD5 (RFC 1321).

      This code implements the MD5 Algorithm defined in RFC 1321, whose
      text is available at
    	http://www.ietf.org/rfc/rfc1321.txt
      The code is derived from the text of the RFC, including the test suite
      (section A.5) but excluding the rest of Appendix A.  It does not include
      any code or documentation that is identified in the RFC as being
      copyrighted.

      The original and principal author of md5.h is L. Peter Deutsch
      <ghost@aladdin.com>.  Other authors are noted in the change history
      that follows (in reverse chronological order):

      2002-04-13 lpd Removed support for non-ANSI compilers; removed
    	references to Ghostscript; clarified derivation from RFC 1321;
    	now handles byte order either statically or dynamically.
      1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
      1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5);
    	added conditionalization for C++ compilation from Martin
    	Purschke <purschke@bnl.gov>.
      1999-05-03 lpd Original version.