crypto: api - Rebirth of crypto_alloc_tfm

This patch reintroduces a completely revamped crypto_alloc_tfm.
The biggest change is that we now take two crypto_type objects
when allocating a tfm, a frontend and a backend.  In fact this
simply formalises what we've been doing behind the API's back.

For example, as it stands crypto_alloc_ahash may use an
actual ahash algorithm or a crypto_hash algorithm.  Putting
this in the API allows us to do this much more cleanly.

The existing types will be converted across gradually.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 5fb6d8618d4d..986db68548f6 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -22,8 +22,18 @@ struct seq_file;
 
 struct crypto_type {
         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
+        unsigned int (*extsize)(struct crypto_alg *alg,
+                                const struct crypto_type *frontend);
         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
+        int (*init_tfm)(struct crypto_tfm *tfm,
+                        const struct crypto_type *frontend);
         void (*show)(struct seq_file *m, struct crypto_alg *alg);
+        struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
+
+        unsigned int type;
+        unsigned int maskclear;
+        unsigned int maskset;
+        unsigned int tfmsize;
 };
 
 struct crypto_instance {