crypto: skcipher - Add separate walker for AEAD decryption

The AEAD decrypt interface includes the authentication tag in
req->cryptlen.  Therefore we need to exlucde that when doing
a walk over it.

This patch adds separate walker functions for AEAD encryption
and decryption.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index d55041f45899..8735979ed341 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -149,6 +149,10 @@ int skcipher_walk_async(struct skcipher_walk *walk,
                         struct skcipher_request *req);
 int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
                        bool atomic);
+int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
+                               struct aead_request *req, bool atomic);
+int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
+                               struct aead_request *req, bool atomic);
 void skcipher_walk_complete(struct skcipher_walk *walk, int err);
 
 static inline void ablkcipher_request_complete(struct ablkcipher_request *req,