c++怎么实现md5加密算法

??C++???MD5????,????????????????????????????????MD5????:

#include 
#include 
#include 

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

    char mdString[33];
    for(int i = 0; i < 16; i++) {
        sprintf(&mdString[i*2], "x", (unsigned int)digest[i]);
    }

    return mdString;
}

int main() {
    std::string input = "Hello, World!";
    std::string md5Result = md5(input);

    std::cout << "MD5 of '" << input << "' is: " << md5Result << std::endl;

    return 0;
}

????????,???OpenSSL???MD5???????????MD5????????????????md5??,??????MD5????????main???,????"Hello, World!"????MD5???

??????,?????OpenSSL?,?????????OpenSSL???????????????:

g++ -o md5_example md5_example.cpp -lssl -lcrypto

????????C++???MD5?????