linux/include/crypto/rng.h
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   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
  18extern struct crypto_rng *crypto_default_rng;
  19
  20int crypto_get_default_rng(void);
  21void crypto_put_default_rng(void);
  22
  23static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm)
  24{
  25        return (struct crypto_rng *)tfm;
  26}
  27
  28static 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
  38static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm)
  39{
  40        return &tfm->base;
  41}
  42
  43static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm)
  44{
  45        return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
  46}
  47
  48static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm)
  49{
  50        return &crypto_rng_tfm(tfm)->crt_rng;
  51}
  52
  53static inline void crypto_free_rng(struct crypto_rng *tfm)
  54{
  55        crypto_free_tfm(crypto_rng_tfm(tfm));
  56}
  57
  58static 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
  64static 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
  70static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
  71{
  72        return crypto_rng_alg(tfm)->seedsize;
  73}
  74
  75#endif
  76
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