From: Dean Jenkins Subject: Does ESP support 64 bit sequence numbering for authentication hash ? Date: Wed, 14 Jan 2009 14:23:53 +0000 Message-ID: <1231943033.7937.120.camel@libdev3.mvista.co.uk> Reply-To: djenkins@mvista.com Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit To: list crypto Return-path: Received: from gateway-1237.mvista.com ([63.81.120.158]:42468 "EHLO gateway-1237.mvista.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751214AbZANOXx (ORCPT ); Wed, 14 Jan 2009 09:23:53 -0500 Received: from [192.168.5.105] (unknown [10.120.0.200]) by hermes.mvista.com (Postfix) with ESMTP id 8A7F0189AA for ; Wed, 14 Jan 2009 06:23:49 -0800 (PST) Sender: linux-crypto-owner@vger.kernel.org List-ID: Hi, Does ESP support 64 bit sequence numbering for use with the authentication HMAC ? 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 ? 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 ? Thanks for any insight. Regards, Dean Jenkins MontaVista Software