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Re: [TLS] PR for PSS support

Russ Housley <housley@vigilsec.com> Thu, 10 September 2015 21:08 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Thu, 10 Sep 2015 17:07:57 -0400
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To: Eric Rescorla <ekr@rtfm.com>
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Subject: Re: [TLS] PR for PSS support
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This text appears in two places (lines 3026 and 3180)

+Only RSA signatures based on RSASSA-PSS MAY be used, regardless of whether
+RSASSA-PKCS-v1_5 appears in "signature_algorithms".

I think it would be better to say:

+RSA signatures MUST be based on RSASSA-PSS, regardless of whether
+RSASSA-PKCS-v1_5 appears in "signature_algorithms".

Russ


On Sep 10, 2015, at 4:18 PM, Eric Rescorla wrote:

> https://github.com/tlswg/tls13-spec/pull/239
> 
> Based on the WG discussion, I've created a PR for adding support for PSS.
> The basic tactic I took is:
> 
> - All in-protocol RSA signatures (i.e., in CertificateVerify) are PSS
> - You must use MGF1 with  the same hash as you used for the content.
> - I added a rsa_pss SignatureAlgorithm field.
> 
> The impact of this is that endpoints can sunset support for RSASSA-PKCS1
> by omitting it from SignatureAlgorithms.
> 
> Note that I didn't deprecate SHA-1 (something Hanno suggested) but I expect
> to in another PR based on WG consensus.
> 
> Please take a look.
> 
> -Ekr

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