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, 2 insertions, 0 deletions

diff --git a/crypto/internal.h b/crypto/internal.h
index 8ef72d76092e..3c19a27a7563 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -109,6 +109,8 @@ void crypto_alg_tested(const char *name, int err);
 void crypto_shoot_alg(struct crypto_alg *alg);
 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
                                       u32 mask);
+struct crypto_tfm *crypto_create_tfm(struct crypto_alg *alg,
+                                     const struct crypto_type *frontend);
 
 int crypto_register_instance(struct crypto_template *tmpl,
                              struct crypto_instance *inst);