include/crypto/rng.h

   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