On Tue, Dec 01, 2009 at 05:49:28PM +0100, Tobias Brunner wrote:
> This patch adds the RFC4543 (GMAC) wrapper for GCM similar to the
> existing RFC4106 wrapper. The main differences between GCM and GMAC are
> the contents of the AAD and that the plaintext is empty for the latter.
>
> Signed-off-by: Tobias Brunner <tobias@xxxxxxxxxxxxxx>
> ---
> crypto/gcm.c | 275 +++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/pfkeyv2.h | 1 +
> net/xfrm/xfrm_algo.c | 16 +++
> 3 files changed, 292 insertions(+), 0 deletions(-)
>
> diff --git a/crypto/gcm.c b/crypto/gcm.c
> index 5fc3292..b097eb4 100644
> --- a/crypto/gcm.c
> +++ b/crypto/gcm.c
> @@ -37,6 +37,15 @@ struct crypto_rfc4106_ctx {
> u8 nonce[4];
> };
>
> +struct crypto_rfc4543_ctx {
> + struct crypto_aead *child;
> + u8 nonce[4];
> + u8 auth_tag[16];
This field needs to be aligned to whatever alignment needed by
the underlying cipher algorithm (currently the biggest is padlock
which needs 16-byte alignment).
See for example how rfc4543/gcm handles it.
Cheers,
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