/* libp11 example code: getrandom.c

 *

 * This examply simply connects to your smart card and

 * asks for a few random bytes.

 *

 * Feel free to copy all of the code as needed.

 *

 */

#include <stdio.h>

#include <libp11.h>

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

{

	PKCS11_CTX *ctx;

	PKCS11_SLOT *slots, *slot;

	unsigned char random[10];

	int rc = 0, i, len;

	unsigned int nslots;

	if (argc != 2) {

		fprintf(stderr, "usage: getrandom /usr/lib/opensc-pkcs11.so\n");

		return 1;

	}

	/* new context */

	ctx = PKCS11_CTX_new();

	/* load pkcs #11 module */

	rc = PKCS11_CTX_load(ctx, argv[1]);

	if (rc) {

		fprintf(stderr, "loading pkcs11 engine failed: %s\n",

			ERR_reason_error_string(ERR_get_error()));

		rc = 1;

		goto nolib;

	}

	/* get information on all slots */

	rc = PKCS11_enumerate_slots(ctx, &slots, &nslots);

	if (rc < 0) {

		fprintf(stderr, "no slots available\n");

		rc = 2;

		goto noslots;

	}

	printf("%d slots available\n", nslots);

	/* get first slot with a token */

	slot = PKCS11_find_token(ctx, slots, nslots);

	if (slot == NULL || slot->token == NULL) {

		fprintf(stderr, "no token available\n");

		rc = 3;

		goto notoken;

	}

	printf("Slot manufacturer......: %s\n", slot->manufacturer);

	printf("Slot description.......: %s\n", slot->description);

	printf("Slot token label.......: %s\n", slot->token->label);

	printf("Slot token manufacturer: %s\n", slot->token->manufacturer);

	printf("Slot token model.......: %s\n", slot->token->model);

	printf("Slot token serialnr....: %s\n", slot->token->serialnr);

	/* get 10 random bytes */

	len = sizeof(random);

	rc = PKCS11_generate_random(slot, random, len);

	if (rc < 0) {

		fprintf(stderr, "generate_random failed: %s\n",

			ERR_reason_error_string(ERR_get_error()));

		rc = 4;

		goto norandom;

	}

	printf("\nRandom numbers generated by the token: ");

	for (i = 0; i < len; i++)

		printf("%02X ", random[i]);

	printf("\n");

	rc = 0;

norandom:

notoken:

	PKCS11_release_all_slots(ctx, slots, nslots);

noslots:

	PKCS11_CTX_unload(ctx);

nolib:

	PKCS11_CTX_free(ctx);

	return rc;

}

/* vim: set noexpandtab: */