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Re: [babel] Purpose of 'generate from/to' and 'accept from/to' for passwords?

Juliusz Chroboczek <jch@irif.fr> Mon, 20 January 2020 20:26 UTC

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Date: Mon, 20 Jan 2020 21:26:39 +0100
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From: Juliusz Chroboczek <jch@irif.fr>
To: Ondrej Zajicek <santiago@crfreenet.org>
Cc: Toke Høiland-Jørgensen <toke@toke.dk>, bird-users@network.cz, babel@ietf.org
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Subject: Re: [babel] Purpose of 'generate from/to' and 'accept from/to' for passwords?
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Thanks, Ondrej.

> Well, it is requirement of OSPF spec (RFC 2328). I could assume it could
> help for smoother key transitions when clocks are not perfectly synchronized.

Ah, I see.

OSPF only allows one key in the trailer, so it needs the ability to send
one key but accept many.  Babel-MAC allows multiple keys in the trailer,
and that ability is therefore not required.

Or am I missing something?

I have no objection to keeping the ability, since it's pretty trivial to
implement.  No objection to making it optional, since it's not
particularly useful in Babel-MAC.  No objection to removing it altogether,
since it's good to avoid unnecessary features.

-- Juliusz

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