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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 |
76 |
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