crypto: ahash - Add instance/spawn support

This patch adds support for creating ahash instances and using
ahash as spawns.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/ahash.c b/crypto/ahash.c
index 8385193..7f599d2 100644 (file)
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -259,5 +259,77 @@ struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
 
+static int ahash_prepare_alg(struct ahash_alg *alg)
+{
+       struct crypto_alg *base = &alg->halg.base;
+
+       if (alg->halg.digestsize > PAGE_SIZE / 8 ||
+           alg->halg.statesize > PAGE_SIZE / 8)
+               return -EINVAL;
+
+       base->cra_type = &crypto_ahash_type;
+       base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+       base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
+
+       return 0;
+}
+
+int crypto_register_ahash(struct ahash_alg *alg)
+{
+       struct crypto_alg *base = &alg->halg.base;
+       int err;
+
+       err = ahash_prepare_alg(alg);
+       if (err)
+               return err;
+
+       return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_ahash);
+
+int crypto_unregister_ahash(struct ahash_alg *alg)
+{
+       return crypto_unregister_alg(&alg->halg.base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
+
+int ahash_register_instance(struct crypto_template *tmpl,
+                           struct ahash_instance *inst)
+{
+       int err;
+
+       err = ahash_prepare_alg(&inst->alg);
+       if (err)
+               return err;
+
+       return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(ahash_register_instance);
+
+void ahash_free_instance(struct crypto_instance *inst)
+{
+       crypto_drop_spawn(crypto_instance_ctx(inst));
+       kfree(ahash_instance(inst));
+}
+EXPORT_SYMBOL_GPL(ahash_free_instance);
+
+int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
+                           struct hash_alg_common *alg,
+                           struct crypto_instance *inst)
+{
+       return crypto_init_spawn2(&spawn->base, &alg->base, inst,
+                                 &crypto_ahash_type);
+}
+EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
+
+struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
+{
+       struct crypto_alg *alg;
+
+       alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
+       return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
+}
+EXPORT_SYMBOL_GPL(ahash_attr_alg);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");

diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 08bdffa..34eda23 100644 (file)
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -34,10 +34,18 @@ struct crypto_hash_walk {
        unsigned int flags;
 };
 
+struct ahash_instance {
+       struct ahash_alg alg;
+};
+
 struct shash_instance {
        struct shash_alg alg;
 };
 
+struct crypto_ahash_spawn {
+       struct crypto_spawn base;
+};
+
 struct crypto_shash_spawn {
        struct crypto_spawn base;
 };
@@ -53,6 +61,15 @@ int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
 
 int crypto_register_ahash(struct ahash_alg *alg);
 int crypto_unregister_ahash(struct ahash_alg *alg);
+int ahash_register_instance(struct crypto_template *tmpl,
+                           struct ahash_instance *inst);
+void ahash_free_instance(struct crypto_instance *inst);
+
+int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
+                           struct hash_alg_common *alg,
+                           struct crypto_instance *inst);
+
+struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask);
 
 int crypto_register_shash(struct shash_alg *alg);
 int crypto_unregister_shash(struct shash_alg *alg);
@@ -88,6 +105,40 @@ static inline void crypto_ahash_set_reqsize(struct crypto_ahash *tfm,
        tfm->reqsize = reqsize;
 }
 
+static inline struct crypto_instance *ahash_crypto_instance(
+       struct ahash_instance *inst)
+{
+       return container_of(&inst->alg.halg.base, struct crypto_instance, alg);
+}
+
+static inline struct ahash_instance *ahash_instance(
+       struct crypto_instance *inst)
+{
+       return container_of(&inst->alg, struct ahash_instance, alg.halg.base);
+}
+
+static inline void *ahash_instance_ctx(struct ahash_instance *inst)
+{
+       return crypto_instance_ctx(ahash_crypto_instance(inst));
+}
+
+static inline unsigned int ahash_instance_headroom(void)
+{
+       return sizeof(struct ahash_alg) - sizeof(struct crypto_alg);
+}
+
+static inline struct ahash_instance *ahash_alloc_instance(
+       const char *name, struct crypto_alg *alg)
+{
+       return crypto_alloc_instance2(name, alg, ahash_instance_headroom());
+}
+
+static inline struct crypto_ahash *crypto_spawn_ahash(
+       struct crypto_ahash_spawn *spawn)
+{
+       return crypto_spawn_tfm2(&spawn->base);
+}
+
 static inline int ahash_enqueue_request(struct crypto_queue *queue,
                                             struct ahash_request *request)
 {