a.c

#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>

 1 int main(int argc, char *argv[])

 {

     char data[] = {, , , , , , , , , };

     char hash_calc[] = {};

     SHA256_CTX c;

     SHA256_Init(&c);

     SHA256_Update(&c, (void *)data, );

     SHA256_Final(hash_calc, &c);

     return ;

 }

 Makefile

 gcc -o a.out  a.c -lcrypto