static int get_random_numbers(u8 *buf, unsigned int len)
{
	struct crypto_rngrng = NULL;
	chardrbg = "drbg_nopr_sha256"; /* Hash DRBG with SHA-256, no PR */
	int ret;

	if (!buf || !len) {
		pr_debug("No output buffer provided\n");
		return -EINVAL;
	}

	rng = crypto_alloc_rng(drbg, 0, 0);
	if (IS_ERR(rng)) {
		pr_debug("could not allocate RNG handle for %s\n", drbg);
		return -PTR_ERR(rng);
	}

	ret = crypto_rng_get_bytes(rng, buf, len);
	if (ret < 0)
		pr_debug("generation of random numbers failed\n");
	else if (ret == 0)
		pr_debug("RNG returned no data");
	else
		pr_debug("RNG returned %d bytes of data\n", ret);

out:
	crypto_free_rng(rng);
	return ret;
}