C_runtime/md5.hpp
author Edouard Tisserant <edouard@beremiz.fr>
Thu, 18 Jul 2024 11:28:38 +0200
changeset 3991 28354ba489b9
parent 3940 934bd46a7500
permissions -rw-r--r--
MQTT: Fix crash when browsing locations
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/* MD5
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    Modified in 2024 for use in Beremiz by Edouard Tisserant
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    converted to C++ class by Frank Thilo (thilo@unix-ag.org)
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    for bzflag (http://www.bzflag.org)
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    based on:
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    md5.h and md5.c
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    reference implementation of RFC 1321
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    Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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rights reserved.
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License to copy and use this software is granted provided that it
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is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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License is also granted to make and use derivative works provided
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that such works are identified as "derived from the RSA Data
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Security, Inc. MD5 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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#ifndef BZF_MD5_H
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#define BZF_MD5_H
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#include <cstdint>
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// a small class for calculating MD5 hashes of strings or byte arrays
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// it is not meant to be fast or secure
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//
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// usage: 1) feed it blocks of uchars with update()
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//        2) get digest() data
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//
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// assumes that char is 8 bit and int is 32 bit
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class MD5
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{
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public:
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    typedef unsigned int size_type; // must be 32bit
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    MD5();
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    void update(const unsigned char *buf, size_type length);
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    typedef struct {
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        uint8_t data[16];
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    } digest_t;
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    digest_t digest();
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    enum
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    {
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        blocksize = 64,
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        digestsize = 16
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    };    
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private:
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    void init();
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    void transform(const uint8_t block[blocksize]);
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    static void decode(uint32_t output[], const uint8_t input[], size_type len);
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    static void encode(uint8_t output[], const uint32_t input[], size_type len);
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    uint8_t buffer[blocksize]; // bytes that didn't fit in last 64 byte chunk
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    uint32_t count[2];          // 64bit counter for number of bits (lo, hi)
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    uint32_t state[4];          // digest so far
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    // low level logic operations
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    static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z);
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    static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z);
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    static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z);
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    static inline uint32_t I(uint32_t x, uint32_t y, uint32_t z);
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    static inline uint32_t rotate_left(uint32_t x, int n);
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    static inline void FF(uint32_t &a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac);
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    static inline void GG(uint32_t &a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac);
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    static inline void HH(uint32_t &a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac);
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    static inline void II(uint32_t &a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t s, uint32_t ac);
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};
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#endif