Dean Jenkins <djenkins@xxxxxxxxxx> wrote: > > Does ESP support 64 bit sequence numbering for use with the > authentication HMAC ? We don't support 64-bit sequence numbers yet. If you look at struct xfrm_replay_state which is where we store the sequence number internally you'll find that it uses u32s. Patches for 64-bit support are welcome of course. > I've looked at struct aead_givcrypt_request and it has a u64 seq member. > Does ESP populate this with a 64 bit sequence number ? That's different. That's a generic value used to construct the IV. > If 32 bit sequence numbering negotiated then how does the HMAC routine > know that it should not use the top 32 bits of seq ? Or is it simply > that if the top 32 bits are zero then the HMAC just uses the lower 32 > bits ? Because the value we start out with is a u32, the high bits are never set for IPsec. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
