Re: [babel] [Babel-users] BASE64 and hex encoding HMAC keys for user presentation

Juliusz Chroboczek <jch@irif.fr> Sun, 23 December 2018 20:40 UTC

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Date: Sun, 23 Dec 2018 21:40:10 +0100
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From: Juliusz Chroboczek <jch@irif.fr>
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Subject: Re: [babel] [Babel-users] BASE64 and hex encoding HMAC keys for user presentation
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>> I think that the HMAC key should be generated automatically.  I'd hope
>> that any actual production deployment of HMAC would generate HMAC keys
>> either randomly or by using a suitable KDF (or whatever the right acronym
>> is) and distribute it automatically.

> Should we pick a KDF? Not necessarily for the RFC, but at least try to
> get compatibility between bird and babeld, so users can just input a
> password and expect things to work?

I think we might need more deployment experience before we can answer that.

At this early stage, however, I wouldn't expect the master key to be
distributed -- the KDF would be applied to the master key on a central
node, and the derived secret is what gets distributed to the babeld and
BIRD instances.  So having a common syntax for the HMAC secret should be
good enough.

-- Juliusz