Re: [TLS] Possible TLS 1.3 erratum

Hubert Kario <hkario@redhat.com> Tue, 20 July 2021 19:37 UTC

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From: Hubert Kario <hkario@redhat.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
Cc: Ilari Liusvaara <ilariliusvaara@welho.com>, <tls@ietf.org>
Date: Tue, 20 Jul 2021 21:37:32 +0200
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Subject: Re: [TLS] Possible TLS 1.3 erratum
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On Tuesday, 20 July 2021 16:18:38 CEST, Peter Gutmann wrote:
> Hubert Kario <hkario@redhat.com> writes:
>
>> I suggest you go back to the RFCs and check exactly what is 
>> needed for proper
>> handling of RSA-PSS Subject Public Key type in X.509. 
>> Specifically when the
>> "parameters" field is present.
>
> Looking at the code I'm using, it's four lines of extra code for PSS when
> reading sigs and four lines extra when writing (OK, technically seven if you
> include the "if" statement and curly braces lines).

And that code will reject a SHA-512 signature if it was made by a 
certificate
with hash algorithm of SHA-256?
What about MGF? Salt length?

Will it reject PKCS#1 v1.5 signatures made with such a key?

It's one thing to be able to read a certificate with those parameters,
it's completely different to actually implement the standard.
-- 
Regards,
Hubert Kario
Senior Quality Engineer, QE BaseOS Security team
Web: www.cz.redhat.com
Red Hat Czech s.r.o., Purky┼łova 99/71, 612 45, Brno, Czech Republic