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 <[email protected]> --- crypto/af_alg.c | 7 +++++++ include/crypto/if_alg.h | 1 + 2 files changed, 8 insertions(+) diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 68ff113..547c369 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -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: 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 @@ 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; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
