Re: [PATCH v12 13/22] gpu: nova-core: Hopper/Blackwell: add FMC signature extraction

[John Hubbard <jhubbard@nvidia.com>]

On 6/2/26 8:09 PM, Timur Tabi wrote:
> On Wed, 2026-06-03 at 09:20 +0900, Alexandre Courbot wrote:
>>
>>> How can we be certain that these lengths are really fixed?  I can add these length
>>> restrictions to
>>> the script that generates the files, but I want to be really certain that they will be
>>> correct for
>>> all time.
>>
>> These are RSA-3072 keys/signatures, which are by convention 384 bytes
>> (or 3072 bits), so I think we can rely on that assumption as long as the
>> content type doesn't change. I am actually surprised that the comment
>> says the section can be shorter - that doesn't sound possible with
>> RSA-30272 .

I recall repeatedly hitting cases on one of the GPU architectures that
used a shorter length, but I should go back and verify that it wasn't
just a bringup "conclusion" that doesn't hold up after the dust settled.

> 
> I'm assuming that maybe they could be RSA-2048.
> 
>> Does the script have a way to validate the length? If so, I agree it is
>> a good idea to do so, to flag the problem before it shows up in the
>> driver.
> 
> Yes, I will add these length checks.

thanks,
-- 
John Hubbard