test-pem.c

/* gcc -o test-pem test-pem.c -lssl -lcrypto */
#include <stdio.h>
#include <stdlib.h>

#include <openssl/pem.h>

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

	FILE *fp = NULL;
	EVP_PKEY* key = NULL;

	if (argc < 2) {
		fprintf(stderr, "Usage: %s PEM_FILE\n", argv[0]);
		exit(EXIT_FAILURE);
	}

	if (NULL == (fp = fopen(argv[1], "rb"))) {
		fprintf(stderr, "Could not open %s.\n", argv[1]);
		exit(EXIT_FAILURE);
	}

	key = PEM_read_PUBKEY(fp, NULL, NULL, NULL);

	printf("key = %p\n", key);

	fclose(fp);
	EVP_PKEY_free(key);

	return EXIT_SUCCESS;
}