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