Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / crypto / krng.c
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
19 static 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
25 static int krng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
26 {
27         return 0;
28 }
29
30 static 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_u                  = {
39                 .rng = {
40                         .rng_make_random        = krng_get_random,
41                         .rng_reset              = krng_reset,
42                         .seedsize               = 0,
43                 }
44         }
45 };
46
47
48 /* Module initalization */
49 static int __init krng_mod_init(void)
50 {
51         return crypto_register_alg(&krng_alg);
52 }
53
54 static void __exit krng_mod_fini(void)
55 {
56         crypto_unregister_alg(&krng_alg);
57         return;
58 }
59
60 module_init(krng_mod_init);
61 module_exit(krng_mod_fini);
62
63 MODULE_LICENSE("GPL");
64 MODULE_DESCRIPTION("Kernel Random Number Generator");
65 MODULE_ALIAS("stdrng");