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crypto: shash - Add shash_instance

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This patch adds shash_instance and the associated alloc/free
functions.  This is meant to be an instance that with a shash
algorithm under it.  Note that the instance itself doesn't have
to be shash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-07-07 15:17:12 +08:00
parent 70ec7bb91a
commit 2e4fddd8e4
2 changed files with 33 additions and 0 deletions
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7
crypto/shash.c
View file

@ -502,5 +502,12 @@ int crypto_unregister_shash(struct shash_alg *alg)
}
EXPORT_SYMBOL_GPL(crypto_unregister_shash);
void shash_free_instance(struct crypto_instance *inst)
{
crypto_drop_spawn(crypto_instance_ctx(inst));
kfree(shash_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_free_instance);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Synchronous cryptographic hash type");

26
include/crypto/internal/hash.h
View file

@ -34,6 +34,10 @@ struct crypto_hash_walk {
unsigned int flags;
};
struct shash_instance {
struct shash_alg alg;
};
extern const struct crypto_type crypto_ahash_type;
int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err);
@ -46,6 +50,8 @@ int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
int crypto_register_shash(struct shash_alg *alg);
int crypto_unregister_shash(struct shash_alg *alg);
void shash_free_instance(struct crypto_instance *inst);
static inline void *crypto_ahash_ctx(struct crypto_ahash *tfm)
{
return crypto_tfm_ctx(&tfm->base);
@ -80,5 +86,25 @@ static inline void *crypto_shash_ctx(struct crypto_shash *tfm)
return crypto_tfm_ctx(&tfm->base);
}
static inline struct crypto_instance *shash_crypto_instance(
struct shash_instance *inst)
{
return container_of(&inst->alg.base, struct crypto_instance, alg);
}
static inline struct shash_instance *shash_instance(
struct crypto_instance *inst)
{
return container_of(__crypto_shash_alg(&inst->alg),
struct shash_instance, alg);
}
static inline struct shash_instance *shash_alloc_instance(
const char *name, struct crypto_alg *alg)
{
return crypto_alloc_instance2(name, alg,
sizeof(struct shash_alg) - sizeof(*alg));
}
#endif /* _CRYPTO_INTERNAL_HASH_H */