[CRYPTO] api: Add template registration

A crypto_template generates a crypto_alg object when given a set of
parameters.  this patch adds the basic data structure fo templates
and code to handle their registration/deregistration.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 0 deletions

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index ed68d494b364..ffec530d52fb 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -14,5 +14,36 @@
 
 #include <linux/crypto.h>
 
+struct module;
+
+struct crypto_instance {
+        struct crypto_alg alg;
+
+        struct crypto_template *tmpl;
+        struct hlist_node list;
+
+        void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
+struct crypto_template {
+        struct list_head list;
+        struct hlist_head instances;
+        struct module *module;
+
+        struct crypto_instance *(*alloc)(void *param, unsigned int len);
+        void (*free)(struct crypto_instance *inst);
+
+        char name[CRYPTO_MAX_ALG_NAME];
+};
+
+int crypto_register_template(struct crypto_template *tmpl);
+void crypto_unregister_template(struct crypto_template *tmpl);
+struct crypto_template *crypto_lookup_template(const char *name);
+
+static inline void *crypto_instance_ctx(struct crypto_instance *inst)
+{
+        return inst->__ctx;
+}
+
 #endif  /* _CRYPTO_ALGAPI_H */