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>

2 files changed, 13 insertions, 1 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 {
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index ea52cd944fd9..ffaaa418cf59 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -546,7 +546,9 @@ struct crypto_attr_u32 {
  * Transform user interface.
  */
  
-struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags);
+struct crypto_tfm *crypto_alloc_tfm(const char *alg_name,
+				    const struct crypto_type *frontend,
+				    u32 type, u32 mask);
 struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
 void crypto_free_tfm(struct crypto_tfm *tfm);