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17f0f4a4 NH |
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 | ||
18 | extern struct crypto_rng *crypto_default_rng; | |
19 | ||
20 | int crypto_get_default_rng(void); | |
21 | void crypto_put_default_rng(void); | |
22 | ||
23 | static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm) | |
24 | { | |
25 | return (struct crypto_rng *)tfm; | |
26 | } | |
27 | ||
28 | static 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 | ||
38 | static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm) | |
39 | { | |
40 | return &tfm->base; | |
41 | } | |
42 | ||
43 | static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm) | |
44 | { | |
45 | return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng; | |
46 | } | |
47 | ||
48 | static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm) | |
49 | { | |
50 | return &crypto_rng_tfm(tfm)->crt_rng; | |
51 | } | |
52 | ||
53 | static inline void crypto_free_rng(struct crypto_rng *tfm) | |
54 | { | |
55 | crypto_free_tfm(crypto_rng_tfm(tfm)); | |
56 | } | |
57 | ||
58 | static 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 | ||
64 | static 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 | ||
70 | static inline int crypto_rng_seedsize(struct crypto_rng *tfm) | |
71 | { | |
72 | return crypto_rng_alg(tfm)->seedsize; | |
73 | } | |
74 | ||
75 | #endif |