From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD610C433E1 for ; Wed, 12 Aug 2020 00:37:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE53420855 for ; Wed, 12 Aug 2020 00:37:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726333AbgHLAh0 (ORCPT ); Tue, 11 Aug 2020 20:37:26 -0400 Received: from helcar.hmeau.com ([216.24.177.18]:51294 "EHLO fornost.hmeau.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726143AbgHLAh0 (ORCPT ); Tue, 11 Aug 2020 20:37:26 -0400 Received: from gwarestrin.arnor.me.apana.org.au ([192.168.0.7]) by fornost.hmeau.com with smtp (Exim 4.92 #5 (Debian)) id 1k5ekq-0007Xc-WE; Wed, 12 Aug 2020 10:36:34 +1000 Received: by gwarestrin.arnor.me.apana.org.au (sSMTP sendmail emulation); Wed, 12 Aug 2020 10:36:32 +1000 Date: Wed, 12 Aug 2020 10:36:32 +1000 From: Herbert Xu To: Horia =?utf-8?Q?Geant=C4=83?= Cc: Eric Biggers , "Van Leeuwen, Pascal" , "Andrei Botila (OSS)" , "David S. Miller" , "linux-crypto@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-s390@vger.kernel.org" , "x86@kernel.org" , "linux-arm-kernel@axis.com" , Andrei Botila , Antoine Tenart Subject: Re: [PATCH 19/22] crypto: inside-secure - add check for xts input length equal to zero Message-ID: <20200812003632.GB4166@gondor.apana.org.au> References: <20200807162010.18979-1-andrei.botila@oss.nxp.com> <20200807162010.18979-20-andrei.botila@oss.nxp.com> <20200810134500.GA22914@gondor.apana.org.au> <20200810170305.GA3352718@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On Tue, Aug 11, 2020 at 06:28:39PM +0300, Horia Geantă wrote: > > What about, for example, CBC? > AFAICT cbc(aes) with input length = 0 is valid. That's just because CBC accepts any input which is a multiple of blocksize. > Same for CTR (with the note that blocksize = 1) and several other algorithms > mentioned in the cover letter. CTR accepts any input size. > What's the rule in these cases? What input size is accepted depends on the algorithm. Cheers, -- Email: Herbert Xu Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt