PEM RSA public key to RSA struct

pempublickeytest.c

// gcc pempublickeytest.c -lssl -lcrypto -I/usr/include/openssl/ -o pempublickeytest

#include <stdio.h>
#include <stdlib.h>
#include <openssl/rsa.h>
#include <openssl/bio.h>
#include <openssl/pem.h>

int main() {
    BIO *bio = BIO_new_file("blah_rsa.pub.pem", "r");
    RSA *rsa = PEM_read_bio_RSAPublicKey(bio, NULL, NULL, NULL);
    printf("rsa: %p, rsa->n: %p, &rsa->n: %p\n", rsa, rsa->n, &rsa->n);
    printf("BN_num_bits: %d\n", BN_num_bits(rsa->n));
    printf("rsa->version: %ld, &rsa->version: %p\n", rsa->version, &rsa->version);
}