From owner-freebsd-geom@FreeBSD.ORG  Tue Jan 13 06:54:59 2015
Return-Path: <owner-freebsd-geom@FreeBSD.ORG>
Delivered-To: freebsd-geom@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 257F6B22;
 Tue, 13 Jan 2015 06:54:59 +0000 (UTC)
Received: from mail-la0-x22f.google.com (mail-la0-x22f.google.com
 [IPv6:2a00:1450:4010:c03::22f])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id B0C0EF17;
 Tue, 13 Jan 2015 06:54:58 +0000 (UTC)
Received: by mail-la0-f47.google.com with SMTP id hz20so1038540lab.6;
 Mon, 12 Jan 2015 22:54:56 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=message-id:from:reply-to:to:references:in-reply-to:subject:date
 :mime-version:content-type:content-transfer-encoding:thread-index
 :content-language;
 bh=hArpmUxCLW2B6v1yvIiKRBksxKyPMhQT5HGBdZCdltk=;
 b=nTGll3v39pVahE1pUXOeWQXw0RGOHbPTdOlotg80I3AG2WklUbarZRnvzC0+zstOyT
 eMlwvfgkqH+GyhAMgINjV3cin4oUKXZkoOklBeoosTe0Y6C6XTT0NgFfaRUNPUvxSLC7
 M8UD62dNYZdiLuT72k9OxQhIq/FZQalJ7DtEBSp9nVmS31gcmQy04SJjysOvFV7k7Los
 GqgzUnV5p4/pfI+SHLZimf2+F48SXh3ItkUTPUkQ1xhGe9PFAopZisABfkElPSCEng+m
 5uFaPdY4QtcXy08MOOGamv9lCiyXoG/uvh9Og5d+EXsYk2I89GbnxVKWLUu3IBL9ZSsj
 LIRg==
X-Received: by 10.152.6.132 with SMTP id b4mr41106234laa.59.1421132096742;
 Mon, 12 Jan 2015 22:54:56 -0800 (PST)
Received: from rimwks1w7x64 ([2001:470:1f15:8e:b007:2759:7397:9491])
 by mx.google.com with ESMTPSA id is5sm583460lac.41.2015.01.12.22.54.54
 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128);
 Mon, 12 Jan 2015 22:54:55 -0800 (PST)
Message-ID: <54b4c13f.45c5980a.6b2c.1d44@mx.google.com>
X-Google-Original-Message-ID: <026801d02efd$d6bcb7c0$84362740$@IM@gmail.com>
From: rozhuk.im@gmail.com
X-Google-Original-From: <Rozhuk.IM@gmail.com>
Reply-To: <Rozhuk.IM@gmail.com>
To: "'Adam Nowacki'" <nowakpl@platinum.linux.pl>,
 <freebsd-hackers@freebsd.org>, <freebsd-geom@FreeBSD.org>
References: <54b33bfa.e31b980a.3e5d.ffffc823@mx.google.com>
 <54B4AE55.9090205@platinum.linux.pl>
In-Reply-To: <54B4AE55.9090205@platinum.linux.pl>
Subject: RE: ChaCha8/12/20 and GEOM ELI tests
Date: Tue, 13 Jan 2015 09:54:53 +0300
MIME-Version: 1.0
Content-Type: text/plain;
	charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Mailer: Microsoft Office Outlook 12.0
Thread-Index: AdAu85//yn4xS/63R0GS0vN078AwhQACNKYg
Content-Language: ru
X-BeenThere: freebsd-geom@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: GEOM-specific discussions and implementations
 <freebsd-geom.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-geom>,
 <mailto:freebsd-geom-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-geom/>
List-Post: <mailto:freebsd-geom@freebsd.org>
List-Help: <mailto:freebsd-geom-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
 <mailto:freebsd-geom-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 13 Jan 2015 06:54:59 -0000


> Maybe faster but a stream cipher is unusable for disk encryption - iv
> is derived from sector number and doesn't change. Being able to write =
a
> known plaintext and read resulting ciphertext allows you to recover =
the
> cipher stream and decrypt any past or future data stored on that
> sector.
> Also use of XTS in this context is a no-op since:
> plain text XOR tweak XOR cipher stream XOR tweak =3D plain text XOR
> cipher stream


Looks like you're right.
Shame on me.

1. ChaCha and XChaCha and can be left in /dev/crypto for future =
applications
2. Geom GELI can leave some small changes for the future - it will be =
easier to add XTS algorithms.
3. AES-XTC can work faster.