CppMD5Demo.cpp

#include 
     
      #include 
      
       #include 
       
        #include "MessageDigest5.h"#define INPUT_BUFFER_SIZE 1024int main(int argc, const char **argv){    if (argc < 3)        std::cout << "Usage: CppMD5Demo [options] 
        \nOptions:\n  -string 
        
         \n  -file 
         
          " << std::endl;    else    {        if (!std::strcmp(argv[1], "-string"))        {            const std::chrono::system_clock::time_point &startTime = std::chrono::system_clock::now();            MessageDigest5 md5;            md5.appendData(argv[2], std::strlen(argv[2]));            const std::string &md5String = md5.result();            const std::chrono::system_clock::time_point &endTime = std::chrono::system_clock::now();            const std::chrono::duration
          
           > &elapseTime = endTime - startTime; std::cout << "MD5 hashed: " << md5String << ", elapsed time: " << elapseTime.count() << " seconds." << std::endl; } else if (!std::strcmp(argv[1], "-file")) { std::ifstream ifs(argv[2], std::ifstream::binary); if (ifs.is_open()) { std::cout << "MD5 hashing..." << std::endl; const std::chrono::system_clock::time_point &startTime = std::chrono::system_clock::now(); MessageDigest5 md5; char buffer[INPUT_BUFFER_SIZE]; while (!ifs.eof()) { std::streamsize numberOfCharacters = ifs.read(buffer, INPUT_BUFFER_SIZE).gcount(); md5.appendData(buffer, numberOfCharacters); } const std::string &md5String = md5.result(); const std::chrono::system_clock::time_point &endTime = std::chrono::system_clock::now(); const std::chrono::duration
           
            > &elapsedTime = endTime - startTime; std::cout << "MD5 hashed: " << md5String << ", elapsed time: " << elapsedTime.count() << " seconds." << std::endl; } else std::cout << "Cannot open file: " << argv[2] << std::endl; } else std::cout << "Usage: CppMD5Demo [options] 
            \nOptions:\n -string 
            
             \n -file 
             
              " << std::endl; } return 0;}
             
            
           
          
         
        
       
      
     

 

MessageDigest5.h

#pragma once#include 
     
      #include "libmd5/md5.h"class MessageDigest5{public:    MessageDigest5();    void appendData(const char *data, size_t dataSize);    std::string result();private:    md5_state_t md5State;};
     

 

MessageDigest5.cpp

#include "MessageDigest5.h"MessageDigest5::MessageDigest5(){    md5_init(&md5State);}void MessageDigest5::appendData(const char *data, size_t dataSize){    md5_append(&md5State, reinterpret_cast
     
      (data), dataSize);}std::string MessageDigest5::result(){    unsigned char digest[16];    md5_finish(&md5State, digest);    std::string md5String;    char hexBuffer[3];    for (size_t i = 0; i != 16; ++i)    {        if (digest[i] < 16)            sprintf(hexBuffer, "0%x", digest[i]);        else            sprintf(hexBuffer, "%x", digest[i]);        md5String.append(hexBuffer);    }    return md5String;}
     

 

关于libmd5，可参考