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/* $Id$ */

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/** @file md5.h Functions to create MD5 checksums. */

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/*

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

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  This software is provided 'as-is', without any express or implied

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  warranty.  In no event will the authors be held liable for any damages

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  arising from the use of this software.

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  Permission is granted to anyone to use this software for any purpose,

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  including commercial applications, and to alter it and redistribute it

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  freely, subject to the following restrictions:

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  1. The origin of this software must not be misrepresented; you must not

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     claim that you wrote the original software. If you use this software

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     in a product, an acknowledgment in the product documentation would be

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     appreciated but is not required.

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  2. Altered source versions must be plainly marked as such, and must not be

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     misrepresented as being the original software.

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  3. This notice may not be removed or altered from any source distribution.

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  L. Peter Deutsch

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  ghost@aladdin.com

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 */

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/*

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  Independent implementation of MD5 (RFC 1321).

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  This code implements the MD5 Algorithm defined in RFC 1321, whose

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  text is available at

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  http://www.ietf.org/rfc/rfc1321.txt

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  The code is derived from the text of the RFC, including the test suite

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  (section A.5) but excluding the rest of Appendix A.  It does not include

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  any code or documentation that is identified in the RFC as being

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  copyrighted.

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  The original and principal author of md5.h is L. Peter Deutsch

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  <ghost@aladdin.com>.  Other authors are noted in the change history

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  that follows (in reverse chronological order):

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  2007-12-24 Changed to C++ and adapted to OpenTTD source

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  2002-04-13 lpd Removed support for non-ANSI compilers; removed

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             references to Ghostscript; clarified derivation from RFC 1321;

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             now handles byte order either statically or dynamically.

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  1999-11-04 lpd Edited comments slightly for automatic TOC extraction.

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  1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5);

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             added conditionalization for C++ compilation from Martin

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             Purschke <purschke@bnl.gov>.

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  1999-05-03 lpd Original version.

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 */

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#ifndef MD5_INCLUDED

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#define MD5_INCLUDED

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/*

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 * This package supports both compile-time and run-time determination of CPU

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 * byte order.  If ARCH_IS_BIG_ENDIAN is defined as 0, the code will be

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 * compiled to run only on little-endian CPUs; if ARCH_IS_BIG_ENDIAN is

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 * defined as non-zero, the code will be compiled to run only on big-endian

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 * CPUs; if ARCH_IS_BIG_ENDIAN is not defined, the code will be compiled to

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 * run on either big- or little-endian CPUs, but will run slightly less

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 * efficiently on either one than if ARCH_IS_BIG_ENDIAN is defined.

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 */

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struct Md5 {

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private:

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	uint32 count[2]; ///< message length in bits, lsw first

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	uint32 abcd[4];  ///< digest buffer

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	uint8 buf[64];   ///< accumulate block

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	void Process(const uint8 *data);

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public:

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	Md5();

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	void Append(const void *data, const size_t nbytes);

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	void Finish(uint8 digest[16]);

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};

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#endif /* MD5_INCLUDED */