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crypto: rng - Convert low-level crypto_rng to new style

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This patch converts the low-level crypto_rng interface to the
"new" style.

This allows existing implementations to be converted over one-
by-one.  Once that is complete we can then remove the old rng
interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-04-21 10:46:38 +08:00
parent 3c5d8fa9f5
commit acec27ff35
4 changed files with 96 additions and 11 deletions
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42
include/crypto/rng.h
View file

@ -15,11 +15,48 @@
#include <linux/crypto.h>
struct crypto_rng;
/**
* struct rng_alg - random number generator definition
*
* @generate: The function defined by this variable obtains a
* random number. The random number generator transform
* must generate the random number out of the context
* provided with this call, plus any additional data
* if provided to the call.
* @seed: Seed or reseed the random number generator. With the
* invocation of this function call, the random number
* generator shall become ready fo generation. If the
* random number generator requires a seed for setting
* up a new state, the seed must be provided by the
* consumer while invoking this function. The required
* size of the seed is defined with @seedsize .
* @seedsize: The seed size required for a random number generator
* initialization defined with this variable. Some
* random number generators does not require a seed
* as the seeding is implemented internally without
* the need of support by the consumer. In this case,
* the seed size is set to zero.
* @base: Common crypto API algorithm data structure.
*/
struct rng_alg {
int (*generate)(struct crypto_rng *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int dlen);
int (*seed)(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
unsigned int seedsize;
struct crypto_alg base;
};
struct crypto_rng {
int (*generate)(struct crypto_rng *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int dlen);
int (*seed)(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
unsigned int seedsize;
struct crypto_tfm base;
};
@ -72,7 +109,8 @@ static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm)
*/
static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm)
{
return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
return container_of(crypto_rng_tfm(tfm)->__crt_alg,
struct rng_alg, base);
}
/**
@ -156,7 +194,7 @@ int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed,
*/
static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
{
return crypto_rng_alg(tfm)->seedsize;
return tfm->seedsize;
}
#endif