MD5.hpp

//
// Created by xiong on 2022/6/9.
//
 
#ifndef EMX_MD5_HPP
#define EMX_MD5_HPP
 
#include <string>
 
namespace Emx {
    class MD5 {
    public:
        typedef unsigned int size_type;// must be 32bit
 
        MD5();
 
        MD5(const std::string &text);
 
        void update(const unsigned char *buf, size_type length);
 
        void update(const char *buf, size_type length);
 
        MD5 &finalize();
 
        std::string hexdigest() const;
 
        friend std::ostream &operator<<(std::ostream &, MD5 md5);
 
    private:
        void init();
 
        typedef unsigned char uint1;//  8bit
        typedef unsigned int uint4; // 32bit
        enum { blocksize = 64 };    // VC6 won't eat a const static int here
 
        void transform(const uint1 block[blocksize]);
 
        static void decode(uint4 output[], const uint1 input[], size_type len);
 
        static void encode(uint1 output[], const uint4 input[], size_type len);
 
        bool finalized;
        uint1 buffer[blocksize];// bytes that didn't fit in last 64 byte chunk
        uint4 count[2];         // 64bit counter for number of bits (lo, hi)
        uint4 state[4];         // digest so far
        uint1 digest[16];       // the result
 
        // low level logic operations
        static inline uint4 F(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 G(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 H(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 I(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 rotate_left(uint4 x, int n);
 
        static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
 
        static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
 
        static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
 
        static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
    };
    class FileMd5 {
    public:
        static std::string Get(const char *path);
    };
 
}// namespace Emx
 
#endif//EMX_MD5_HPP