Root/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
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_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 */
49static int __init krng_mod_init(void)
50{
51    return crypto_register_alg(&krng_alg);
52}
53
54static void __exit krng_mod_fini(void)
55{
56    crypto_unregister_alg(&krng_alg);
57    return;
58}
59
60module_init(krng_mod_init);
61module_exit(krng_mod_fini);
62
63MODULE_LICENSE("GPL");
64MODULE_DESCRIPTION("Kernel Random Number Generator");
65MODULE_ALIAS("stdrng");
66

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