1/*
2 * RNG implementation using standard kernel RNG.
3 *
4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * any later version.
10 *
11 */
12
13#include <crypto/internal/rng.h>
14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/random.h>
18
19static int krng_get_random(struct crypto_rng *tfm, u8 *rdata, unsigned int dlen)
20{
21	get_random_bytes(rdata, dlen);
22	return 0;
23}
24
25static int krng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
26{
27	return 0;
28}
29
30static struct crypto_alg krng_alg = {
31	.cra_name		= "stdrng",
32	.cra_driver_name	= "krng",
33	.cra_priority		= 200,
34	.cra_flags		= CRYPTO_ALG_TYPE_RNG,
35	.cra_ctxsize		= 0,
36	.cra_type		= &crypto_rng_type,
37	.cra_module		= THIS_MODULE,
38	.cra_list		= LIST_HEAD_INIT(krng_alg.cra_list),
39	.cra_u			= {
40		.rng = {
41			.rng_make_random	= krng_get_random,
42			.rng_reset		= krng_reset,
43			.seedsize		= 0,
44		}
45	}
46};
47
48
49/* Module initalization */
50static int __init krng_mod_init(void)
51{
52	return crypto_register_alg(&krng_alg);
53}
54
55static void __exit krng_mod_fini(void)
56{
57	crypto_unregister_alg(&krng_alg);
58	return;
59}
60
61module_init(krng_mod_init);
62module_exit(krng_mod_fini);
63
64MODULE_LICENSE("GPL");
65MODULE_DESCRIPTION("Kernel Random Number Generator");
66MODULE_ALIAS("stdrng");
67