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Re: [CFRG] Handling the errata for RFC 7748

"Stanislav V. Smyshlyaev" <smyshsv@gmail.com> Tue, 15 December 2020 07:07 UTC

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From: "Stanislav V. Smyshlyaev" <smyshsv@gmail.com>
Date: Tue, 15 Dec 2020 10:07:49 +0300
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To: Mike Hamburg <mike@shiftleft.org>
Cc: Adam Langley <agl@imperialviolet.org>, CFRG <cfrg@irtf.org>
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Subject: Re: [CFRG] Handling the errata for RFC 7748
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Many thanks to Benoît, Juan, Mike, Sean and Adam for their comments!

I've handled the errata according to the plan.

Regards,
Stanislav

On Thu, 10 Dec 2020 at 21:50, Mike Hamburg <mike@shiftleft.org> wrote:

>
>
> On Dec 10, 2020, at 5:26 PM, Adam Langley <agl@imperialviolet.org> wrote:
>
> On Wed, Dec 9, 2020 at 10:50 PM Stanislav V. Smyshlyaev <smyshsv@gmail.com>
> wrote:
>
>> Dear CFRG,
>>
>> There are three reported errata for RFC 7748:
>> https://www.rfc-editor.org/errata/eid5568
>> https://www.rfc-editor.org/errata/eid5651
>> https://www.rfc-editor.org/errata/eid5028
>>
>> The third one (5028) is an editorial one, I am sure that it improves
>> clarity of the text, therefore, I support it without doubt.
>>
>> The first one (5568) is a technical one, with a proposal to change one
>> bit of the input u-coordinate in the hexadecimal representation (to make it
>> "consistent" with the base 10 representation). However, the author of 5568
>> has probably missed that implementations of x25519 should "mask" that bit
>> after taking a u-coordinate as an input - therefore, the existing text of
>> RFC does not have any errors there. This is exactly the result of unclear
>> text that is addressed in the abovementioned third erratum
>> (5028).Therefore, I would propose to reject the erratum.
>>
>> The second one (5651) notes that the algorithm description has a mistake
>> in the description (for calculation of z_2). After implementing the
>> described algorithm myself (with the MAGMA package) I've obtained the
>> expected numbers. I suspect that the RFC text is OK, –therefore I would
>> propose to reject the erratum.
>>
>> Therefore, I'm planning to approve the third one (5028) and reject the
>> other two errata (5568 and 5651).
>>
>
> I agree with all of the above. Thanks for checking them.
>
>
> AGL
>
>
> I also agree.  Thanks Stanislav and Benoît.
>
> — Mike
>
>

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