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crypto: af_alg - add setsockopt for auth tag size

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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>
This commit is contained in:
Stephan Mueller 2014-12-07 23:21:42 +01:00 committed by Herbert Xu
parent 905b42e559
commit 25fb8638e9
2 changed files with 8 additions and 0 deletions
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7
crypto/af_alg.c
View File

@ -215,6 +215,13 @@ static int alg_setsockopt(struct socket *sock, int level, int optname,
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:

1
include/crypto/if_alg.h
View File

@ -50,6 +50,7 @@ struct af_alg_type {
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;