2 * RNG: Random Number Generator algorithms under the crypto API
4 * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
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)
16 #include <linux/crypto.h>
18 extern struct crypto_rng *crypto_default_rng;
20 int crypto_get_default_rng(void);
21 void crypto_put_default_rng(void);
23 static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm)
25 return (struct crypto_rng *)tfm;
28 static inline struct crypto_rng *crypto_alloc_rng(const char *alg_name,
31 type &= ~CRYPTO_ALG_TYPE_MASK;
32 type |= CRYPTO_ALG_TYPE_RNG;
33 mask |= CRYPTO_ALG_TYPE_MASK;
35 return __crypto_rng_cast(crypto_alloc_base(alg_name, type, mask));
38 static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm)
43 static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm)
45 return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
48 static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm)
50 return &crypto_rng_tfm(tfm)->crt_rng;
53 static inline void crypto_free_rng(struct crypto_rng *tfm)
55 crypto_free_tfm(crypto_rng_tfm(tfm));
58 static inline int crypto_rng_get_bytes(struct crypto_rng *tfm,
59 u8 *rdata, unsigned int dlen)
61 return crypto_rng_crt(tfm)->rng_gen_random(tfm, rdata, dlen);
64 static inline int crypto_rng_reset(struct crypto_rng *tfm,
65 u8 *seed, unsigned int slen)
67 return crypto_rng_crt(tfm)->rng_reset(tfm, seed, slen);
70 static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
72 return crypto_rng_alg(tfm)->seedsize;