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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