From: Milan Broz <gmazyland@gmail.com>
To: Eric Biggers <ebiggers@kernel.org>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
linux-fscrypt@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
LKML <linux-kernel@vger.kernel.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Paul Crowley <paulcrowley@google.com>,
Greg Kaiser <gkaiser@google.com>,
Michael Halcrow <mhalcrow@google.com>,
Samuel Neves <samuel.c.p.neves@gmail.com>,
Tomer Ashur <tomer.ashur@esat.kuleuven.be>
Subject: Re: [RFC PATCH v2 00/12] crypto: Adiantum support
Date: Sat, 17 Nov 2018 11:29:23 +0100 [thread overview]
Message-ID: <56883f08-26cb-ecef-5698-1c2948714773@gmail.com> (raw)
In-Reply-To: <20181116215249.GA27149@gmail.com>
On 16/11/2018 22:52, Eric Biggers wrote:
> Hi Milan,
>
> On Sat, Oct 20, 2018 at 12:26:20PM +0200, Milan Broz wrote:
>>
>> Adiantum (as in your current git branches on kernel.org) can be used for dm-crypt
>> without any changes (yes, I played with it :) and with some easy tricks directly
>> through cryptsetup/LUKS as well.
>>
>> I think we should have this as an alternative to length-preserving wide-block
>> cipher modes for FDE.
>>
>
> Yes, dm-crypt can use Adiantum by specifying the cipher as
> "capi:adiantum(xchacha12,aes)-plain64".
>
> But, I'm having trouble getting cryptsetup/LUKS to use Adiantum.
> Using LUKS1, the following works:
>
> cryptsetup luksFormat /dev/$partition --cipher='capi:adiantum(xchacha12,aes)-plain64' --key-size 256
>
> However, when possible we'd like people to use 4K sectors for better
> performance, which I understand requires using the LUKS2 format along with
> cryptsetup v2.0.0+ and Linux v4.12+. But the following does *not* work:
>
> cryptsetup luksFormat /dev/$partition --cipher='capi:adiantum(xchacha12,aes)-plain64' --key-size 256 --type luks2 --sector-size 4096
Hi Eric,
actually I planned to test it and then reply to these patches with example cryptsetup
commands, but did not have time for it yet.
So thanks for a reminder ;-)
Recent cryptsetup supports sector-size even for plain device.
You actually do not need to use capi: prefix, Adiantum is a composition,
so "xchacha20,aes-adiantum-plain64" works as well (and it should work even for old cryptsetup).
(It is ugly, but it should be compatible.)
# cryptsetup open --type plain -c xchacha20,aes-adiantum-plain64 -s 256 --sector-size 4096 /dev/sdb test
For LUKS and benchmark, Adiantum need to use 32 bytes IV. And we have these parameter,
unfortunately, hardcoded...
(I guess there is already a way how to get this dynamically from userspace crypto API now.)
So, I already added patch to devel branch patch for benchmark to support Adiantum few days ago
https://gitlab.com/cryptsetup/cryptsetup/commit/bce567db461e558af7d735c694a50146db899709
This allows trivial benchmark (but it just encrypts one big blob of data):
# cryptsetup benchmark -c xchacha20,aes-adiantum -s 256
# Tests are approximate using memory only (no storage IO).
# Algorithm | Key | Encryption | Decryption
xchacha20,aes-adiantum 256b 146.6 MiB/s 148.0 MiB/s
...
# ./cryptsetup benchmark -c xchacha12,aes-adiantum -s 256
xchacha12,aes-adiantum 256b 181.7 MiB/s 184.6 MiB/s
For LUKS2, we need a similar change to cryptoAPI IV size (unfortunately it does not
fallback to old keyslot handling, so LUKS2 does not work currently now).
I quickly added a workaround that fallbacks to default keyslot encryption for keyslots
in this case
https://gitlab.com/cryptsetup/cryptsetup/commit/29e87add5aac9d5eb0087881146988d9c4280915
then you can use LUKS2
# cryptsetup luksFormat --type luks2 --sector-size 4096 -c xchacha20,aes-adiantum-plain64 -s 256 /dev/sdb
(Example above will encrypt keyslots with AES-XTS and use Aviantum for data only.)
So, unfortunately yes, we need some small changes in cryptsetup for LUKS;
plain mode should work out of the box (with the syntax above).
Milan
next prev parent reply other threads:[~2018-11-17 10:29 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-15 17:54 [RFC PATCH v2 00/12] crypto: Adiantum support Eric Biggers
2018-10-15 17:54 ` [RFC PATCH v2 01/12] crypto: chacha20-generic - add HChaCha20 library function Eric Biggers
2018-10-19 14:13 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 02/12] crypto: chacha20-generic - add XChaCha20 support Eric Biggers
2018-10-19 14:24 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 03/12] crypto: chacha20-generic - refactor to allow varying number of rounds Eric Biggers
2018-10-19 14:25 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 04/12] crypto: chacha - add XChaCha12 support Eric Biggers
2018-10-19 14:34 ` Ard Biesheuvel
2018-10-19 18:28 ` Eric Biggers
2018-10-15 17:54 ` [RFC PATCH v2 05/12] crypto: arm/chacha20 - add XChaCha20 support Eric Biggers
2018-10-20 2:29 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 06/12] crypto: arm/chacha20 - refactor to allow varying number of rounds Eric Biggers
2018-10-20 3:35 ` Ard Biesheuvel
2018-10-20 5:26 ` Eric Biggers
2018-10-15 17:54 ` [RFC PATCH v2 07/12] crypto: arm/chacha - add XChaCha12 support Eric Biggers
2018-10-20 3:36 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 08/12] crypto: poly1305 - add Poly1305 core API Eric Biggers
2018-10-20 3:45 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 09/12] crypto: nhpoly1305 - add NHPoly1305 support Eric Biggers
2018-10-20 4:00 ` Ard Biesheuvel
2018-10-20 5:38 ` Eric Biggers
2018-10-20 15:06 ` Ard Biesheuvel
2018-10-22 18:42 ` Eric Biggers
2018-10-22 22:25 ` Ard Biesheuvel
2018-10-22 22:40 ` Eric Biggers
2018-10-22 22:43 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 10/12] crypto: arm/nhpoly1305 - add NEON-accelerated NHPoly1305 Eric Biggers
2018-10-20 4:12 ` Ard Biesheuvel
2018-10-20 5:51 ` Eric Biggers
2018-10-20 15:00 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 11/12] crypto: adiantum - add Adiantum support Eric Biggers
2018-10-20 4:17 ` Ard Biesheuvel
2018-10-20 7:12 ` Eric Biggers
2018-10-23 10:40 ` Ard Biesheuvel
2018-10-24 22:06 ` Eric Biggers
2018-10-30 8:17 ` Herbert Xu
2018-10-15 17:54 ` [RFC PATCH v2 12/12] fscrypt: " Eric Biggers
2018-10-19 15:58 ` [RFC PATCH v2 00/12] crypto: " Jason A. Donenfeld
2018-10-19 18:19 ` Paul Crowley
2018-10-20 3:24 ` Ard Biesheuvel
2018-10-20 5:22 ` Eric Biggers
[not found] ` <2395454e-a0dc-408f-4138-9d15ab5f20b8@esat.kuleuven.be>
2018-10-22 11:20 ` Tomer Ashur
2018-10-19 19:04 ` Eric Biggers
2018-10-20 10:26 ` Milan Broz
2018-10-20 13:47 ` Jason A. Donenfeld
2018-11-16 21:52 ` Eric Biggers
2018-11-17 10:29 ` Milan Broz [this message]
2018-11-19 19:28 ` Eric Biggers
2018-11-19 20:05 ` Milan Broz
2018-11-19 20:30 ` Jason A. Donenfeld
2018-10-21 22:23 ` Eric Biggers
2018-10-21 22:51 ` Jason A. Donenfeld
2018-10-22 17:17 ` Paul Crowley
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