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crypto: aead - Add type-safe init/exit functions

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As it stands the only non-type safe functions left in the new
AEAD interface are the cra_init/cra_exit functions.  It means
exposing the ugly __crypto_aead_cast to every AEAD implementor.

This patch adds type-safe init/exit functions to AEAD.  Existing
algorithms are unaffected while new implementations can simply
fill in these two instead of cra_init/cra_exit.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-05-28 22:07:53 +08:00
parent addfda2fc2
commit 5eb8ec6dc8
2 changed files with 27 additions and 0 deletions
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14
crypto/aead.c
View File

@ -174,6 +174,14 @@ static int crypto_old_aead_init_tfm(struct crypto_tfm *tfm)
return 0;
}
static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_aead *aead = __crypto_aead_cast(tfm);
struct aead_alg *alg = crypto_aead_alg(aead);
alg->exit(aead);
}
static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_aead *aead = __crypto_aead_cast(tfm);
@ -189,6 +197,12 @@ static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
aead->child = __crypto_aead_cast(tfm);
aead->authsize = alg->maxauthsize;
if (alg->exit)
aead->base.exit = crypto_aead_exit_tfm;
if (alg->init)
return alg->init(aead);
return 0;
}

13
include/crypto/aead.h
View File

@ -109,6 +109,17 @@ struct aead_givcrypt_request {
* @decrypt: see struct ablkcipher_alg
* @geniv: see struct ablkcipher_alg
* @ivsize: see struct ablkcipher_alg
* @init: Initialize the cryptographic transformation object. This function
* is used to 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: Deinitialize the cryptographic transformation object. This is a
* counterpart to @init, used to remove various changes set in
* @init.
*
* All fields except @ivsize is mandatory and must be filled.
*/
@ -118,6 +129,8 @@ struct aead_alg {
int (*setauthsize)(struct crypto_aead *tfm, unsigned int authsize);
int (*encrypt)(struct aead_request *req);
int (*decrypt)(struct aead_request *req);
int (*init)(struct crypto_aead *tfm);
void (*exit)(struct crypto_aead *tfm);
const char *geniv;