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/* * RNG: Random Number Generator algorithms under the crypto API * * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #ifndef _CRYPTO_RNG_H #define _CRYPTO_RNG_H #include <linux/crypto.h> extern struct crypto_rng *crypto_default_rng; int crypto_get_default_rng(void); void crypto_put_default_rng(void); static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm) { return (struct crypto_rng *)tfm; } static inline struct crypto_rng *crypto_alloc_rng(const char *alg_name, u32 type, u32 mask) { type &= ~CRYPTO_ALG_TYPE_MASK; type |= CRYPTO_ALG_TYPE_RNG; mask |= CRYPTO_ALG_TYPE_MASK; return __crypto_rng_cast(crypto_alloc_base(alg_name, type, mask)); } static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm) { return &tfm->base; } static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm) { return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng; } static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm) { return &crypto_rng_tfm(tfm)->crt_rng; } static inline void crypto_free_rng(struct crypto_rng *tfm) { crypto_free_tfm(crypto_rng_tfm(tfm)); } static inline int crypto_rng_get_bytes(struct crypto_rng *tfm, u8 *rdata, unsigned int dlen) { return crypto_rng_crt(tfm)->rng_gen_random(tfm, rdata, dlen); } static inline int crypto_rng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen) { return crypto_rng_crt(tfm)->rng_reset(tfm, seed, slen); } static inline int crypto_rng_seedsize(struct crypto_rng *tfm) { return crypto_rng_alg(tfm)->seedsize; } #endif