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crypto: hmac - Use init_tfm/exit_tfm interface 

This patch switches hmac over to the new init_tfm/exit_tfm interface
as opposed to cra_init/cra_exit.  This way the shash API can make
sure that descsize does not exceed the maximum.

This patch also adds the API helper shash_alg_instance.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2019-12-08 13:42:53 +08:00
parent 9689569394
commit d9e1670b80
2 changed files with 13 additions and 13 deletions
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20
crypto/hmac.c
View File

@ -138,12 +138,11 @@ static int hmac_finup(struct shash_desc *pdesc, const u8 *data,
crypto_shash_finup(desc, out, ds, out);
}
static int hmac_init_tfm(struct crypto_tfm *tfm)
static int hmac_init_tfm(struct crypto_shash *parent)
{
struct crypto_shash *parent = __crypto_shash_cast(tfm);
struct crypto_shash *hash;
struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst);
struct shash_instance *inst = shash_alg_instance(parent);
struct crypto_shash_spawn *spawn = shash_instance_ctx(inst);
struct hmac_ctx *ctx = hmac_ctx(parent);
hash = crypto_spawn_shash(spawn);
@ -152,18 +151,14 @@ static int hmac_init_tfm(struct crypto_tfm *tfm)
parent->descsize = sizeof(struct shash_desc) +
crypto_shash_descsize(hash);
if (WARN_ON(parent->descsize > HASH_MAX_DESCSIZE)) {
crypto_free_shash(hash);
return -EINVAL;
}
ctx->hash = hash;
return 0;
}
static void hmac_exit_tfm(struct crypto_tfm *tfm)
static void hmac_exit_tfm(struct crypto_shash *parent)
{
struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm));
struct hmac_ctx *ctx = hmac_ctx(parent);
crypto_free_shash(ctx->hash);
}
@ -217,9 +212,6 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) +
ALIGN(ss * 2, crypto_tfm_ctx_alignment());
inst->alg.base.cra_init = hmac_init_tfm;
inst->alg.base.cra_exit = hmac_exit_tfm;
inst->alg.init = hmac_init;
inst->alg.update = hmac_update;
inst->alg.final = hmac_final;
@ -227,6 +219,8 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.export = hmac_export;
inst->alg.import = hmac_import;
inst->alg.setkey = hmac_setkey;
inst->alg.init_tfm = hmac_init_tfm;
inst->alg.exit_tfm = hmac_exit_tfm;
err = shash_register_instance(tmpl, inst);
if (err) {

6
include/crypto/internal/hash.h
View File

@ -220,6 +220,12 @@ static inline struct shash_instance *shash_instance(
struct shash_instance, alg);
}
static inline struct shash_instance *shash_alg_instance(
struct crypto_shash *shash)
{
return shash_instance(crypto_tfm_alg_instance(&shash->base));
}
static inline void *shash_instance_ctx(struct shash_instance *inst)
{
return crypto_instance_ctx(shash_crypto_instance(inst));