Re: [TLS] Deprecating TLS 1.0, 1.1 and SHA1 signature algorithms

Andrei Popov <Andrei.Popov@microsoft.com> Mon, 11 January 2016 23:38 UTC

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From: Andrei Popov <Andrei.Popov@microsoft.com>
To: Yuhong Bao <yuhongbao_386@hotmail.com>, David Benjamin <davidben@chromium.org>, Kurt Roeckx <kurt@roeckx.be>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] Deprecating TLS 1.0, 1.1 and SHA1 signature algorithms
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Date: Mon, 11 Jan 2016 23:38:25 +0000
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References: <20160111183017.GA12243@roeckx.be>, <CAF8qwaC-u-8HCTFegx+yhwSQibrrPULX0i6UaopfQrzaMS7gew@mail.gmail.com> <BLU177-W18E00AB27F0A359CF4AF51C3C90@phx.gbl>
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Archived-At: <http://mailarchive.ietf.org/arch/msg/tls/mKYjLVGTBAC3GAebT-VfkZlrMNE>
Subject: Re: [TLS] Deprecating TLS 1.0, 1.1 and SHA1 signature algorithms
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Yes, per RFC 5246: 
"   If the client provided a "signature_algorithms" extension, then all
   certificates provided by the server MUST be signed by a
   hash/signature algorithm pair that appears in that extension."

Cheers,

Andrei

-----Original Message-----
From: TLS [mailto:tls-bounces@ietf.org] On Behalf Of Yuhong Bao
Sent: Monday, January 11, 2016 3:30 PM
To: David Benjamin <davidben@chromium.org>;; Kurt Roeckx <kurt@roeckx.be>;; tls@ietf.org
Subject: Re: [TLS] Deprecating TLS 1.0, 1.1 and SHA1 signature algorithms

> (c) Servers which sign SHA-2 but fail if signature_algorithms omits 
> SHA-1. The ones I looked at were all from serving SHA-1 certificates, 
> so probably their SSL stack compares certs against sig_algs.
I think SChannel is one of them. 		 	   		  
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