[CRYPTO] skcipher: Add givcrypt operations and givcipher type

Different block cipher modes have different requirements for intialisation
vectors.  For example, CBC can use a simple randomly generated IV while
modes such as CTR must use an IV generation mechanisms that give a stronger
guarantee on the lack of collisions.  Furthermore, disk encryption modes
have their own IV generation algorithms.

Up until now IV generation has been left to the users of the symmetric
key cipher API.  This is inconvenient as the number of block cipher modes
increase because the user needs to be aware of which mode is supposed to
be paired with which IV generation algorithm.

Therefore it makes sense to integrate the IV generation into the crypto
API.  This patch takes the first step in that direction by creating two
new ablkcipher operations, givencrypt and givdecrypt that generates an
IV before performing the actual encryption or decryption.

The operations are currently not exposed to the user.  That will be done
once the underlying functionality has actually been implemented.

It also creates the underlying givcipher type.  Algorithms that directly
generate IVs would use it instead of ablkcipher.  All other algorithms
(including all existing ones) would generate a givcipher algorithm upon
registration.  This givcipher algorithm will be constructed from the geniv
string that's stored in every algorithm.  That string will locate a template
which is instantiated by the blkcipher/ablkcipher algorithm in question to
give a givcipher algorithm.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 87879e64ff4c..c9402dd12d03 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -14,11 +14,14 @@
 #define _CRYPTO_INTERNAL_SKCIPHER_H
 
 #include <crypto/algapi.h>
+#include <crypto/skcipher.h>
 
 struct crypto_skcipher_spawn {
         struct crypto_spawn base;
 };
 
+extern const struct crypto_type crypto_givcipher_type;
+
 static inline void crypto_set_skcipher_spawn(
         struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
 {
@@ -47,5 +50,11 @@ static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
                                  crypto_skcipher_mask(0)));
 }
 
+static inline void *skcipher_givcrypt_reqctx(
+        struct skcipher_givcrypt_request *req)
+{
+        return ablkcipher_request_ctx(&req->creq);
+}
+
 #endif  /* _CRYPTO_INTERNAL_SKCIPHER_H */