[CRYPTO] aead: Add givcrypt operations

This patch adds the underlying givcrypt operations for aead and associated
support elements.  The rationale is identical to that of the skcipher
givcrypt operations, i.e., sometimes only the algorithm knows how the
IV should be generated.

A new request type aead_givcrypt_request is added which contains an
embedded aead_request structure with two new elements to support this
operation.  The new elements are seq and giv.  The seq field should
contain a strictly increasing 64-bit integer which may be used by
certain IV generators as an input value.  The giv field will be used
to store the generated IV.  It does not need to obey the alignment
requirements of the algorithm because it's not used during the operation.

The existing iv field must still be available as it will be used to store
intermediate IVs and the output IV if chaining is desired.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 835dcaf3fe4e..7524928bff93 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -106,6 +106,7 @@ struct crypto_blkcipher;
 struct crypto_hash;
 struct crypto_tfm;
 struct crypto_type;
+struct aead_givcrypt_request;
 struct skcipher_givcrypt_request;
 
 typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
@@ -202,6 +203,8 @@ struct aead_alg {
         int (*setauthsize)(struct crypto_aead *tfm, unsigned int authsize);
         int (*encrypt)(struct aead_request *req);
         int (*decrypt)(struct aead_request *req);
+        int (*givencrypt)(struct aead_givcrypt_request *req);
+        int (*givdecrypt)(struct aead_givcrypt_request *req);
 
         unsigned int ivsize;
         unsigned int maxauthsize;
@@ -348,6 +351,8 @@ struct aead_tfm {
                       unsigned int keylen);
         int (*encrypt)(struct aead_request *req);
         int (*decrypt)(struct aead_request *req);
+        int (*givencrypt)(struct aead_givcrypt_request *req);
+        int (*givdecrypt)(struct aead_givcrypt_request *req);
         unsigned int ivsize;
         unsigned int authsize;
         unsigned int reqsize;