Md5码计算流程图

最近做一个文件上传下载的程序，其中要用到Md5码校验，而看了一些网上提供的代码没一点思路，哪位大神发张图来讲解一下，谢啦~

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admin的md5码,以及md5值计算工具

(32位) 21232f297a57a5a743894a0e4a801fc3

(16位) 7A57A5A743894A0E

(40位) 7a57a5a743894a0e4a801fc343894a0e4a801fc3

//md5.h #ifndef bzf_md5_h #define bzf_md5_h #include #include // a small class for calculating md5 hashes of strings or byte arrays // it is not meant to be fast or secure // // usage: 1) feed it blocks of uchars with update() // 2) finalize() // 3) get hexdigest() string // or // md5(std::string).hexdigest() // // assumes that char is 8 bit and int is 32 bit 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); }; std::string md5(const std::string str); #endif