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Re: [babel] hmac info model elements

Toke Høiland-Jørgensen <toke@toke.dk> Mon, 07 January 2019 16:35 UTC

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From: Toke Høiland-Jørgensen <toke@toke.dk>
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To: "STARK, BARBARA H" <bs7652@att.com>, 'Juliusz Chroboczek' <jch@irif.fr>
Cc: 'Mahesh Jethanandani' <mjethanandani@gmail.com>, Babel at IETF <babel@ietf.org>
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Date: Mon, 07 Jan 2019 17:35:36 +0100
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Subject: Re: [babel] hmac info model elements
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"STARK, BARBARA H" <bs7652@att.com> writes:

> Toke said: "Bird uses an unencoded string..." 
> <bhs> I'm not sure what "unencoded" means here? But this sounds like
> maybe the entered string is a "passphrase" / PSK, like what's used for
> Wi-Fi, which is then used to derive the HMAC key using Unicode
> encoding?

Nope, no derivation, just the raw ASCII bytes from the string used as an
HMAC key, zero-padded to the block size. Unless the supplied ASCII
string is longer than the block size, in which case it is hashed
first.

However, looking at the code again, this is actually controlled by the
protocol, so if we were to specify something different for Babel, that
would be doable as well... And I think agreeing on a mechanism would
probably be a good idea to ensure interoperability.

-Toke

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