#include <openssl/md5.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <string.h>
#include <stdio.h>

#define RSA_KEY_FILE "rsakey.txt"
// > openssl genrsa -out rsakey.txt 1024

int main(void)
{
        RSA* rsa = NULL;
        FILE* fp = NULL;

        if((fp = fopen("sec.pem", "r")) == NULL)
        {
                fprintf(stderr, "unable to open CAKey file\n");
                return;
        }

        PEM_read_RSAPrivateKey(fp, &rsa, NULL, NULL);

        if(rsa == NULL)
        {
                fprintf(stderr, "rsa is NULL\n");
                return;
     }
RSA_free(rsa);

}