mirror of https://github.com/OpenTTD/OpenTTD.git
90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
/** @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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/** The number of bytes in a MD5 hash. */
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static const size_t MD5_HASH_BYTES = 16;
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/** Container for storing a MD5 hash/checksum/digest. */
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struct MD5Hash : std::array<byte, MD5_HASH_BYTES> {
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MD5Hash() : std::array<byte, MD5_HASH_BYTES>{} {}
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/**
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* Exclusively-or the given hash into this hash.
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* @param other The other hash.
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* @return Reference to this hash.
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*/
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MD5Hash &operator^=(const MD5Hash &other)
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{
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for (size_t i = 0; i < size(); i++) this->operator[](i) ^= other[i];
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return *this;
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}
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};
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struct Md5 {
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private:
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uint32_t count[2]; ///< message length in bits, lsw first
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uint32_t abcd[4]; ///< digest buffer
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uint8_t buf[64]; ///< accumulate block
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void Process(const uint8_t *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(MD5Hash &digest);
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};
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#endif /* MD5_INCLUDED */
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