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
__crypto_rng_cast(struct crypto_tfm * tfm)23 static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm)
24 {
25 return (struct crypto_rng *)tfm;
26 }
27
crypto_alloc_rng(const char * alg_name,u32 type,u32 mask)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
crypto_rng_tfm(struct crypto_rng * tfm)38 static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm)
39 {
40 return &tfm->base;
41 }
42
crypto_rng_alg(struct crypto_rng * tfm)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
crypto_rng_crt(struct crypto_rng * tfm)48 static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm)
49 {
50 return &crypto_rng_tfm(tfm)->crt_rng;
51 }
52
crypto_free_rng(struct crypto_rng * tfm)53 static inline void crypto_free_rng(struct crypto_rng *tfm)
54 {
55 crypto_free_tfm(crypto_rng_tfm(tfm));
56 }
57
crypto_rng_get_bytes(struct crypto_rng * tfm,u8 * rdata,unsigned int dlen)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
crypto_rng_reset(struct crypto_rng * tfm,u8 * seed,unsigned int slen)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
crypto_rng_seedsize(struct crypto_rng * tfm)70 static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
71 {
72 return crypto_rng_alg(tfm)->seedsize;
73 }
74
75 #endif
76