linux-ext4 - Re: [PATCH] fscrypt: add support for ChaCha20 contents encryption

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Message-ID: <CAHmME9ob8eG1yS=jkGHFnYDq+FtiJCP38CKpzUs0Z33R8_0Msw@mail.gmail.com>
Date:   Fri, 8 Dec 2017 03:51:28 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     linux-fscrypt@...r.kernel.org, "Theodore Ts'o" <tytso@....edu>,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Michael Halcrow <mhalcrow@...gle.com>,
        Paul Crowley <paulcrowley@...gle.com>,
        Martin Willi <martin@...ongswan.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        David Gstir <david@...ma-star.at>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH] fscrypt: add support for ChaCha20 contents encryption

Hi Eric,

Nice to see more use of ChaCha20. However...

Can we skip over the "sort of worse than XTS, but not having _real_
authentication sucks anyway in either case, so whatever" and move
directly to, "linux finally supports authenticated encryption for disk
encryption!"? This would be a big deal and would actually be a
noticeable security improvement, instead of a potentially dubious step
sidewaysbackish.

Bcachefs supports ChaCha20Poly1305, which is pretty neat. From what
I've read, performance is acceptable too.
http://bcachefs.org/Encryption/

Jason