#include <fstream>
#include <openssl/sha.h>
#include <cstring>

int main() {

        unsigned char digest[SHA_DIGEST_LENGTH];
        std::ifstream file("test.cpp");

        std::string str((std::istreambuf_iterator<char>(file)),
                std::istreambuf_iterator<char>());

        SHA1((unsigned char*)str.c_str(), str.length(), (unsigned char*)&digest);

        char mdString[SHA_DIGEST_LENGTH*2+1];

        for(int i = 0; i < SHA_DIGEST_LENGTH; i++)
                sprintf(&mdString[i*2], "%02x", (unsigned int)digest[i]);

        printf("SHA1 digest: %s\n", mdString);

        return 0;

}