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crypto: ahash - Add init_tfm/exit_tfm

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This patch adds the type-safe init_tfm/exit_tfm functions to the
ahash interface.  This is meant to replace the unsafe cra_init and
cra_exit interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2020-08-18 18:25:34 +10:00
parent 6779d0e6b0
commit e73d340db6
2 changed files with 25 additions and 1 deletions
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13
crypto/ahash.c
View File

@ -444,6 +444,14 @@ static int ahash_def_finup(struct ahash_request *req)
return ahash_def_finup_finish1(req, err); return ahash_def_finup_finish1(req, err);
} }
static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
struct ahash_alg *alg = crypto_ahash_alg(hash);
alg->exit_tfm(hash);
}
static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
{ {
struct crypto_ahash *hash = __crypto_ahash_cast(tfm); struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
@ -467,7 +475,10 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
ahash_set_needkey(hash); ahash_set_needkey(hash);
} }
return 0; if (alg->exit_tfm)
tfm->exit = crypto_ahash_exit_tfm;
return alg->init_tfm ? alg->init_tfm(hash) : 0;
} }
static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)

13
include/crypto/hash.h
View File

@ -123,6 +123,17 @@ struct ahash_request {
* data so the transformation can continue from this point onward. No * data so the transformation can continue from this point onward. No
* data processing happens at this point. Driver must not use * data processing happens at this point. Driver must not use
* req->result. * req->result.
* @init_tfm: Initialize the cryptographic transformation object.
* This function is called only once at the instantiation
* time, right after the transformation context was
* allocated. In case the cryptographic hardware has
* some special requirements which need to be handled
* by software, this function shall check for the precise
* requirement of the transformation and put any software
* fallbacks in place.
* @exit_tfm: Deinitialize the cryptographic transformation object.
* This is a counterpart to @init_tfm, used to remove
* various changes set in @init_tfm.
* @halg: see struct hash_alg_common * @halg: see struct hash_alg_common
*/ */
struct ahash_alg { struct ahash_alg {
@ -135,6 +146,8 @@ struct ahash_alg {
int (*import)(struct ahash_request *req, const void *in); int (*import)(struct ahash_request *req, const void *in);
int (*setkey)(struct crypto_ahash *tfm, const u8 *key, int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen); unsigned int keylen);
int (*init_tfm)(struct crypto_ahash *tfm);
void (*exit_tfm)(struct crypto_ahash *tfm);
struct hash_alg_common halg; struct hash_alg_common halg;
}; };