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Re: [babel] Some open HMAC issues

Toke Høiland-Jørgensen <toke@toke.dk> Mon, 02 July 2018 10:23 UTC

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From: Toke Høiland-Jørgensen <toke@toke.dk>
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To: David Schinazi <dschinazi@apple.com>, Juliusz Chroboczek <jch@irif.fr>
Cc: Clara Dô <clarado_perso@yahoo.fr>, Weronika Kołodziejak <weronika.kolodziejak@gmail.com>, babel@ietf.org
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Date: Mon, 02 Jul 2018 12:23:35 +0200
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Subject: Re: [babel] Some open HMAC issues
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David Schinazi <dschinazi@apple.com> writes:

>> On Jun 30, 2018, at 06:04, Juliusz Chroboczek <jch@irif.fr> wrote:
>> 
>> 0. Explicit vs. implicit Indices
>> 
>> The discussion between explicit (DKC variant) and implicit (Stenberg
>> variant) indices is still open.  Just because we've made DKC code
>> available doesn't mean the WG needs to follow our idiosyncrasies.
>> 
>> (I'll try to find the inner strength to summarise the discussion at some
>> point.)
>> 
>> 
>> 1. Implemented and MTI HMACs
>> 
>> We've followed Denis' text, and implemented SHA1 and RIPEMD160.  Could any
>> security specialists please advise:
>> 
>>  - which algorithms should be implemented;
>>  - which algorithms should we propose to the WG as Mandatory to
>>    Implement (MTI)?
>
> I think SHA2-256 should be the only MTI, as it is considered secure and
> is widely available.

+1 on sha-256, but I think it might be worth considering blake2s as
well, since that gives smaller sigs and is specifically designed for
low-powered devices, such as mips-based routers :)

-Toke

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