/*

    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

*/

/*	$Id: md5.h,v 1.4 2002/04/13 19:20:28 lpd Exp $	*/

/*
    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.
*/

// HARFANG(R) Copyright (C) 2021 Emmanuel Julien, NWNC HARFANG. Released under GPL/LGPL/Commercial Licence, see licence.txt for details.

#pragma once

#include <cstddef>

namespace hg {

/*
    This package supports both compile-time and run-time determination of CPU
    byte order.  If ARCH_IS_BIG_ENDIAN is defined as 0, the code will be
    compiled to run only on little-endian CPUs; if ARCH_IS_BIG_ENDIAN is
    defined as non-zero, the code will be compiled to run only on big-endian
    CPUs; if ARCH_IS_BIG_ENDIAN is not defined, the code will be compiled to
    run on either big- or little-endian CPUs, but will run slightly less
    efficiently on either one than if ARCH_IS_BIG_ENDIAN is defined.
*/

typedef unsigned char md5_byte_t; // 8-bit byte
typedef unsigned int md5_word_t; // 32-bit word

/*
	@short MD5 digest.
*/
class MD5Digest {
public:
	MD5Digest() { Reset(); }

	void Reset();

	/// Append data to the message.
	void Append(const md5_byte_t *data, size_t size);
	/// Finish the message and return the digest.
	void Finish(md5_byte_t digest[16]);

private:
	md5_word_t count[2], abcd[4];
	md5_byte_t buf[64];

	void Process(const md5_byte_t *data /*[64]*/);
};

/**
	@short Convert a digest to string.
	@note The string is not NULL terminated by this function.
*/
void MD5DigestToString(const md5_byte_t digest[16], char *string_out);

} // namespace hg
