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Re: [babel] info-model: preparing -09 on github

"STARK, BARBARA H" <bs7652@att.com> Wed, 14 August 2019 18:08 UTC

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From: "STARK, BARBARA H" <bs7652@att.com>
To: 'Juliusz Chroboczek' <jch@irif.fr>
CC: "'babel@ietf.org'" <babel@ietf.org>
Thread-Topic: [babel] info-model: preparing -09 on github
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Date: Wed, 14 Aug 2019 18:04:59 +0000
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Subject: Re: [babel] info-model: preparing -09 on github
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> I didn't see anything wrong.  (Nit: "an implementation attempting to
> comply", I suggest "that purports to comply".  It sounds, like, really smart.)

I'll take this under advisement.

> > 1. link properties / metric-comp-algorithm /
> > interface-metric-algorithm / split-horizon: I'm leaning away from any
> > new objects for link property grouping.
> 
> I agree, pending further input.
> 
> > 2. babel-mac-key-value description to constrain it according to the
> > babel-mac-key-algorithm allowed key length
> 
> Here's my current proposal (pending further input):
> 
>   This value is of a length suitable for the associated
>   babel-mac-key-algorithm.  If algorithm is based on the HMAC
>   construction, this value MUST be between 0 and the block size of the
>   underlying hash inclusive (64 in the case of HMAC-SHA-256); if it is
>   smaller, it is zero-extended before use as specified in Section 2 of RFC
>   2104.  If the algorithm is Blake2s, then it MUST be between 0 and 32
>   inclusive, and is used as described in Section 3.3 of RFC 7693.

I'm not sure what "use" and "used" mean in the context of info-model. Info-model doesn't use these values -- that's babel-hmac's job.
Is this suggesting that it's ok for info-model to provide babel-hmac with any value between 0 and 64 bytes in length for HMAC-SHA256 or between 0 and 32 bytes in length for Blake2s and babel-hmac can be expected to zero-pad? Or are you still expecting info-model to do the zero-padding before providing to babel-hmac?
Barbara

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