Thanks for these, I think we’re all resolved!

spt

> On Nov 29, 2022, at 08:31, CJ Tjhai <[email protected]> wrote:
> 
> Hi Sean,
> 
> Many thanks for the review.
> 
> Please see the comments inlined below.
> 
> Best regards,
> CJ
> 
> PS. Hi @Valery Smyslov, you've beat me to it again. I've added my changes to 
> your PR. 
> 
> 
> 
> On Tue, 29 Nov 2022 at 12:18, Valery Smyslov <[email protected]> wrote:
> Hi Sean,
> 
> thank you for your review. Please, see inline.
> 
> > Reviewer: Sean Turner
> > Review result: Has Nits
> > 
> > Hi! Thanks for the well written draft. I really liked Appendix B that 
> > includes
> > the tried but discarded designs.
> 
> Thank you.
> 
> > Issue worth discussing (and it might be a short discussion):
> > 
> > Are there any instructions that the DEs needs to make sure that this 
> > registry
> > is not populated with PQ-wanna-be Transforms? E.g., I show up my shiny new 
> > (and
> > supposedly) PQ resistant alg and the DE says ....
> 
> I'm not sure the DEs have enough qualification to judge whether the proposed 
> algorithm is good or bad with its cryptographic properties. I believe it is 
> the CFRG's task 
> to bless algorithms and the DEs should only pay attention to is whether 
> the proposed algorithm meets the protocol restrictions (and those are 
> listed in Section 4.1 for the DEs).
> 
> 
> I agree with Valery on this. Besides, the current draft is a generic one, it 
> doesn't specify any specific algorithms. So I would expect that there will be 
> specific documents specifying how to use a particular algorithm with this 
> draft. That document will specify amongst other thing the wire format, key 
> generation, encapsulation, decapsulation, etc. Once that document is 
> approved, then only entries will be added into the registry.  
>  
> > Nits:
> > 
> > The use of “we” is a style thing that I would change, but if the WG/IESG are
> > good with it I can get on board too.
> 
> I'll rely on my co-authors on this :-)
> 
> Thanks, the use of "we" and "ours" have now been removed. The changes can be 
> found in the same PR: https://github.com/post-quantum/ietf-pq-ikev2/pull/22 
>  
> 
> > s1.2, last para: “require such a requirement” is a bit awkward. How about 
> > “have
> > such a requirement” or “levy such a requirement”?
> 
> Changed to "have such a requirement".
> 
> > s2, hybrid: I think you might want to include some words by what you mean by
> > “hybrid”? Maybe as simple as copy some of the text from the 1st para of s3.1
> > forward, “when multiple key exchanges are performed and the calculated 
> > shared
> > key depends on all of them”.
> > 
> > s3.1, s/Note that with this semantics,/Note that with these semantics,
> 
> Fixed, thank you.
> 
> > s4.1:
> > 
> > s/must/MUST in the DE instructions?
> 
> Hm, I may be wrong, but in my understanding RFC2119 words have their meaning
> only in the context of an RFC/I-D (to which the DE instructions don't belong 
> to)...
> 
> > s/addition,any/addition, any
> 
> Fixed.
> 
> > s5:
> > 
> > s/dwarfed/ with thwart or mitigate
> 
> Changed to mitigate.
> 
> > s/the data need to remain/the data needs to remain
> 
> Fixed.
> 
> > A.1:
> > 
> > s/as follows/as follows.
> 
> OK.
> 
> > s/SKEYSEED(1)  …. )./SKEYSEED(1) … )
> 
> Done.
> 
> > s/{SK_d(1) … SPIr)./{SK_d(1) … SPIr)
> 
> Ditto.
> 
> > Is this missing:
> > 
> >  The updated SKEYSEED value is then used to derive the following
> >  keying materials
> > 
> > between these two lines:
> > 
> >  SKEYSEED(2) = prf(SK_d(1), SK(2) | Ni | Nr)
> >  {SK_d(2) | SK_ai(2) | SK_ar(2) | SK_ei(2) | SK_er(2) | SK_pi(2) |
> >     SK_pr(2)} = prf+ (SKEYSEED(2), Ni | Nr | SPIi | SPIr)
> 
> Well, I think it must be clear enough from the formulas - 
> we first calculate new SKEYSEED (SKEYSEED(2)) and then
> use it to calculate new SK_* keys (SK_*(2)).
> We purposely added indexes in round braces to make it easier 
> for readers to figure out "generations" of the keys.
> Do you think it is not clear enough?
> 
> > A.4:s/a security association/an IKE SA
> 
> OK.
> 
> The changes can be reviewed in the PR:
> https://github.com/post-quantum/ietf-pq-ikev2/pull/22
> 
> Regards,
> Valery.
> 
> 
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