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17f0f4a47d
This patch adds a random number generator interface as well as a cryptographic pseudo-random number generator based on AES. It is meant to be used in cases where a deterministic CPRNG is required. One of the first applications will be as an input in the IPsec IV generation process. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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* RNG: Random Number Generator algorithms under the crypto API
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*
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* Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#ifndef _CRYPTO_RNG_H
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#define _CRYPTO_RNG_H
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#include <linux/crypto.h>
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extern struct crypto_rng *crypto_default_rng;
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int crypto_get_default_rng(void);
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void crypto_put_default_rng(void);
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static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm)
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{
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return (struct crypto_rng *)tfm;
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}
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static inline struct crypto_rng *crypto_alloc_rng(const char *alg_name,
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u32 type, u32 mask)
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{
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type &= ~CRYPTO_ALG_TYPE_MASK;
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type |= CRYPTO_ALG_TYPE_RNG;
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mask |= CRYPTO_ALG_TYPE_MASK;
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return __crypto_rng_cast(crypto_alloc_base(alg_name, type, mask));
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}
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static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm)
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{
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return &tfm->base;
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}
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static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm)
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{
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return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
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}
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static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm)
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{
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return &crypto_rng_tfm(tfm)->crt_rng;
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}
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static inline void crypto_free_rng(struct crypto_rng *tfm)
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{
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crypto_free_tfm(crypto_rng_tfm(tfm));
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}
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static inline int crypto_rng_get_bytes(struct crypto_rng *tfm,
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u8 *rdata, unsigned int dlen)
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{
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return crypto_rng_crt(tfm)->rng_gen_random(tfm, rdata, dlen);
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}
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static inline int crypto_rng_reset(struct crypto_rng *tfm,
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u8 *seed, unsigned int slen)
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{
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return crypto_rng_crt(tfm)->rng_reset(tfm, seed, slen);
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}
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static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
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{
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return crypto_rng_alg(tfm)->seedsize;
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}
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#endif
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