C++ md5加密与SHA比较

?C++?,???????????MD5???SHA????????openssl???MD5?SHA-256???????:

#include 
#include 
#include 
#include 

std::string md5(std::string input) {
    unsigned char digest[MD5_DIGEST_LENGTH];
    MD5((unsigned char*)input.c_str(), input.length(), digest);

    char mdString[(MD5_DIGEST_LENGTH * 2) + 1];
    for(int i = 0; i < MD5_DIGEST_LENGTH; i++)
         sprintf(&mdString[i*2], "x", (unsigned int)digest[i]);

    return std::string(mdString);
}

std::string sha256(std::string input) {
    unsigned char digest[SHA256_DIGEST_LENGTH];
    SHA256((unsigned const char*)input.c_str(), input.length(), digest);

    char mdString[(SHA256_DIGEST_LENGTH * 2) + 1];
    for(int i = 0; i < SHA256_DIGEST_LENGTH; i++)
         sprintf(&mdString[i*2], "x", (unsigned int)digest[i]);

    return std::string(mdString);
}

int main() {
    std::string input = "Hello, world!";
    
    std::string md5hash = md5(input);
    std::string sha256hash = sha256(input);
    
    std::cout << "MD5 hash: " << md5hash << std::endl;
    std::cout << "SHA-256 hash: " << sha256hash << std::endl;
    
    return 0;
}

???????,md5???sha256??????????????MD5?SHA-256????main??????????????????????

??????,MD5??????????,??????????,???????????SHA-256??????????????????????????????,???????SHA????,?SHA-384?SHA-512?