crypto: shash - Add shash_instance
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@xxxxxxxxxxxxxxxxxxx>
---
crypto/shash.c | 7 +++++++
include/crypto/internal/hash.h | 26 ++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/crypto/shash.c b/crypto/shash.c
index 2ccc8b0..8f9d883 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -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");
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 82b7056..44d3bcd 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -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 */
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