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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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56
crypto/rng.c
View File

@ -36,10 +36,15 @@ static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm)
return container_of(tfm, struct crypto_rng, base);
}
static inline struct old_rng_alg *crypto_old_rng_alg(struct crypto_rng *tfm)
{
return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
}
static int generate(struct crypto_rng *tfm, const u8 *src, unsigned int slen,
u8 *dst, unsigned int dlen)
{
return crypto_rng_alg(tfm)->rng_make_random(tfm, dst, dlen);
return crypto_old_rng_alg(tfm)->rng_make_random(tfm, dst, dlen);
}
static int rngapi_reset(struct crypto_rng *tfm, const u8 *seed,
@ -58,7 +63,7 @@ static int rngapi_reset(struct crypto_rng *tfm, const u8 *seed,
src = buf;
}
err = crypto_rng_alg(tfm)->rng_reset(tfm, src, slen);
err = crypto_old_rng_alg(tfm)->rng_reset(tfm, src, slen);
kzfree(buf);
return err;
@ -88,13 +93,31 @@ EXPORT_SYMBOL_GPL(crypto_rng_reset);
static int crypto_rng_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_rng *rng = __crypto_rng_cast(tfm);
struct rng_alg *alg = crypto_rng_alg(rng);
struct old_rng_alg *oalg = crypto_old_rng_alg(rng);
rng->generate = generate;
rng->seed = rngapi_reset;
if (oalg->rng_make_random) {
rng->generate = generate;
rng->seed = rngapi_reset;
rng->seedsize = oalg->seedsize;
return 0;
}
rng->generate = alg->generate;
rng->seed = alg->seed;
rng->seedsize = alg->seedsize;
return 0;
}
static unsigned int seedsize(struct crypto_alg *alg)
{
struct rng_alg *ralg = container_of(alg, struct rng_alg, base);
return alg->cra_rng.rng_make_random ?
alg->cra_rng.seedsize : ralg->seedsize;
}
#ifdef CONFIG_NET
static int crypto_rng_report(struct sk_buff *skb, struct crypto_alg *alg)
{
@ -102,7 +125,7 @@ static int crypto_rng_report(struct sk_buff *skb, struct crypto_alg *alg)
strncpy(rrng.type, "rng", sizeof(rrng.type));
rrng.seedsize = alg->cra_rng.seedsize;
rrng.seedsize = seedsize(alg);
if (nla_put(skb, CRYPTOCFGA_REPORT_RNG,
sizeof(struct crypto_report_rng), &rrng))
@ -124,7 +147,7 @@ static void crypto_rng_show(struct seq_file *m, struct crypto_alg *alg)
static void crypto_rng_show(struct seq_file *m, struct crypto_alg *alg)
{
seq_printf(m, "type : rng\n");
seq_printf(m, "seedsize : %u\n", alg->cra_rng.seedsize);
seq_printf(m, "seedsize : %u\n", seedsize(alg));
}
const struct crypto_type crypto_rng_type = {
@ -189,5 +212,26 @@ void crypto_put_default_rng(void)
}
EXPORT_SYMBOL_GPL(crypto_put_default_rng);
int crypto_register_rng(struct rng_alg *alg)
{
struct crypto_alg *base = &alg->base;
if (alg->seedsize > PAGE_SIZE / 8)
return -EINVAL;
base->cra_type = &crypto_rng_type;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
base->cra_flags |= CRYPTO_ALG_TYPE_RNG;
return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_rng);
void crypto_unregister_rng(struct rng_alg *alg)
{
crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_rng);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Random Number Generator");

3
include/crypto/internal/rng.h
View File

@ -18,6 +18,9 @@
extern const struct crypto_type crypto_rng_type;
int crypto_register_rng(struct rng_alg *alg);
void crypto_unregister_rng(struct rng_alg *alg);
static inline void *crypto_rng_ctx(struct crypto_rng *tfm)
{
return crypto_tfm_ctx(&tfm->base);

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

6
include/linux/crypto.h
View File

@ -427,7 +427,7 @@ struct compress_alg {
};
/**
* struct rng_alg - random number generator definition
* struct old_rng_alg - random number generator definition
* @rng_make_random: 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
@ -445,7 +445,7 @@ struct compress_alg {
* seeding is implemented internally without the need of support by
* the consumer. In this case, the seed size is set to zero.
*/
struct rng_alg {
struct old_rng_alg {
int (*rng_make_random)(struct crypto_rng *tfm, u8 *rdata,
unsigned int dlen);
int (*rng_reset)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
@ -559,7 +559,7 @@ struct crypto_alg {
struct blkcipher_alg blkcipher;
struct cipher_alg cipher;
struct compress_alg compress;
struct rng_alg rng;
struct old_rng_alg rng;
} cra_u;
int (*cra_init)(struct crypto_tfm *tfm);