crypto: af_alg - add setsockopt for auth tag size
Use setsockopt on the tfm FD to provide the authentication tag size for
an AEAD cipher. This is achieved by adding a callback function which is
intended to be used by the AEAD AF_ALG implementation.
The optlen argument of the setsockopt specifies the authentication tag
size to be used with the AEAD tfm.
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 8ffc174..a8ff3c4 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -215,6 +215,13 @@
goto unlock;
err = alg_setkey(sk, optval, optlen);
+ break;
+ case ALG_SET_AEAD_AUTHSIZE:
+ if (sock->state == SS_CONNECTED)
+ goto unlock;
+ if (!type->setauthsize)
+ goto unlock;
+ err = type->setauthsize(ask->private, optlen);
}
unlock:
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index cd62bf4..5c7b6c5 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -50,6 +50,7 @@
void (*release)(void *private);
int (*setkey)(void *private, const u8 *key, unsigned int keylen);
int (*accept)(void *private, struct sock *sk);
+ int (*setauthsize)(void *private, unsigned int authsize);
struct proto_ops *ops;
struct module *owner;