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Re: [Cfrg] [RFC] [DRAFT] eXtended-nonce ChaCha and AEAD_XChaCha20-Poly1305 (updated)

Tony Arcieri <bascule@gmail.com> Thu, 11 October 2018 19:49 UTC

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From: Tony Arcieri <bascule@gmail.com>
Date: Thu, 11 Oct 2018 12:48:55 -0700
Message-ID: <CAHOTMVJjHvDOEpAdC8vBAGDS7-F5qHHhGD=DnDP=t197mTt4Lg@mail.gmail.com>
To: Scott Arciszewski <scott@paragonie.com>
Cc: cfrg@ietf.org
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Subject: Re: [Cfrg] [RFC] [DRAFT] eXtended-nonce ChaCha and AEAD_XChaCha20-Poly1305 (updated)
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On Thu, Oct 11, 2018 at 11:29 AM Scott Arciszewski <scott@paragonie.com>
wrote:

> If anyone at CFRG has any remarks (positive, negative, or neutral), please
> share them at your earliest convenience.
>

I'll just note that despite the relative simplicity of this construction I
consider it an important work item for the group. The general primitive
(which NaCl calls "secretbox") has proven incredibly popular, but right now
there is a schism between Salsa20-based boxes (original NaCl) and
ChaCha20-based ones (WireGuard, libsodium). The former has a heritage
through NaCl, whereas the latter is what probably makes the most sense for
IETF protocols as it's effectively an RFC 7539 extension.

I imagine we'll see this sort of construction pop up quite a bit in future
protocols, including not just WireGuard but things like JWT work. An RFC
for XChaCha seems like an important prerequisite for e.g. a full WireGuard
RFC (with WireGuard having seen quite a bit of success in the "rough
consensus and running code" sense).

-- 
Tony Arcieri

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