Md5Encode.h

/*
*******************************************************
* brief: md5 encryption
* author: Monkey.Knight
*******************************************************
*/

#ifndef __MD5ENCODE_H__
#define __MD5ENCODE_H__

// std
#include <string>

// define
#define UInt32 unsigned int
#define BIT_OF_BYTE  8
#define BIT_OF_GROUP 512
#define SRC_DATA_LEN 64

// 四个非线性函数宏定义
#define DEF_F(X, Y, Z ) ((( (X) & (Y) )|((~X)&(Z))))
#define DEF_G(X, Y, Z)  (((X)&(Z))|((Y)&(~Z)))
#define DEF_H(X, Y, Z)  ((X)^(Y)^(Z))
#define DEF_I(X, Y, Z)  ((Y)^((X)|(~Z)))

// 求链接数函数宏定义
#define FF(a, b, c, d, Mj, s, ti)  (a = b + CycleMoveLeft((a + DEF_F(b,c,d) + Mj + ti),s));
#define GG(a, b, c, d, Mj, s, ti)  (a = b + CycleMoveLeft((a + DEF_G(b,c,d) + Mj + ti),s));
#define HH(a, b, c, d, Mj, s, ti)  (a = b + CycleMoveLeft((a + DEF_H(b,c,d) + Mj + ti),s));
#define II(a, b, c, d, Mj, s, ti)  (a = b + CycleMoveLeft((a + DEF_I(b,c,d) + Mj + ti),s));


class CMd5Encode{
public:
    // 4轮循环算法
    struct ParamDynamic{
        UInt32 ua_;
        UInt32 ub_;
        UInt32 uc_;
        UInt32 ud_;
        UInt32 va_last_;
        UInt32 vb_last_;
        UInt32 vc_last_;
        UInt32 vd_last_;
    };
public:
    CMd5Encode() {
    }
    std::string Encode(std::string src_info);

protected:
    
    UInt32 CycleMoveLeft(UInt32 src_num, int bit_num_to_move);
    UInt32 FillData(const char *in_data_ptr, int data_byte_len, char** out_data_ptr);
    void RoundF(char *data_512_ptr, ParamDynamic & param);
    void RoundG(char *data_512_ptr, ParamDynamic & param);
    void RoundH(char *data_512_ptr, ParamDynamic & param);
    void RoundI(char *data_512_ptr, ParamDynamic & param);
    void RotationCalculate(char *data_512_ptr, ParamDynamic & param);
    std::string GetHexStr(unsigned int num_str);
    
private:
    // 幻数定义
    static const int kA;
    static const int kB;
    static const int kC;
    static const int kD;
    static const unsigned long long k_ti_num_integer;
};

#endif