Root/include/crypto/rng.h

1/*
2 * RNG: Random Number Generator algorithms under the crypto API
3 *
4 * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
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 Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#ifndef _CRYPTO_RNG_H
14#define _CRYPTO_RNG_H
15
16#include <linux/crypto.h>
17
18extern struct crypto_rng *crypto_default_rng;
19
20int crypto_get_default_rng(void);
21void crypto_put_default_rng(void);
22
23static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm)
24{
25    return (struct crypto_rng *)tfm;
26}
27
28static inline struct crypto_rng *crypto_alloc_rng(const char *alg_name,
29                          u32 type, u32 mask)
30{
31    type &= ~CRYPTO_ALG_TYPE_MASK;
32    type |= CRYPTO_ALG_TYPE_RNG;
33    mask |= CRYPTO_ALG_TYPE_MASK;
34
35    return __crypto_rng_cast(crypto_alloc_base(alg_name, type, mask));
36}
37
38static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm)
39{
40    return &tfm->base;
41}
42
43static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm)
44{
45    return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
46}
47
48static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm)
49{
50    return &crypto_rng_tfm(tfm)->crt_rng;
51}
52
53static inline void crypto_free_rng(struct crypto_rng *tfm)
54{
55    crypto_free_tfm(crypto_rng_tfm(tfm));
56}
57
58static inline int crypto_rng_get_bytes(struct crypto_rng *tfm,
59                       u8 *rdata, unsigned int dlen)
60{
61    return crypto_rng_crt(tfm)->rng_gen_random(tfm, rdata, dlen);
62}
63
64static inline int crypto_rng_reset(struct crypto_rng *tfm,
65                   u8 *seed, unsigned int slen)
66{
67    return crypto_rng_crt(tfm)->rng_reset(tfm, seed, slen);
68}
69
70static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
71{
72    return crypto_rng_alg(tfm)->seedsize;
73}
74
75#endif
76

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