<div dir="ltr"><div><div>Two corrections here:<br><br></div>1. The current debate in TLS [1] is not about certificates, it's about the authentication signature in TLS, i.e., the signature by which the remote party proves control of the private key corresponding to the public key in the certificate. The invocation of CABF is peripheral to the discussion. Certificate validation and algorithms for signing certs are not germane to the TLS WG.<br><br></div>2. NSS has full support for RSA-PSS as an algorithm [2], but it has not been plumbed through to the mozilla::pkix library used by Firefox, or the path building libraries included in NSS. There is a bug open to add it to mozilla::pkix [3].<br><br>[1] <a href="https://mailarchive.ietf.org/arch/msg/tls/1Os5H_4Njnj2mxT5Djs7PNvyN1A">https://mailarchive.ietf.org/arch/msg/tls/1Os5H_4Njnj2mxT5Djs7PNvyN1A</a><br>[2] <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1215295">https://bugzilla.mozilla.org/show_bug.cgi?id=1215295</a><br>[3] <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1088140">https://bugzilla.mozilla.org/show_bug.cgi?id=1088140</a><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 1, 2016 at 3:54 PM, Ryan Sleevi <span dir="ltr"><<a href="mailto:sleevi@google.com" target="_blank">sleevi@google.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">NSS doesn't support them, so that's a decent chunk of Firefox and Chrome (OS, Linux, iOS) users.</div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 1, 2016 at 12:52 PM, Rick Andrews <span dir="ltr"><<a href="mailto:Rick_Andrews@symantec.com" target="_blank">Rick_Andrews@symantec.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Peter, no, nothing in the BRs forbids PSS. For all I know there may be CAs issuing certs with PSS signatures. But I don't think anyone has done a survey of browser and server support.<br>
<span><font color="#888888"><br>
-Rick<br>
</font></span><div><div><br>
> On Mar 1, 2016, at 12:49 PM, Peter Bowen <<a href="mailto:pzb@amzn.com" target="_blank">pzb@amzn.com</a>> wrote:<br>
><br>
> Rick,<br>
><br>
> One clarification related specifically to CA/Browser Forum:<br>
><br>
> I do not see anything in the BRs that requires or forbids RSASSA-PSS. Is there anything that prevents public CAs from issuing certificates with RSASSA-PSS (e.g RFC 4055/5756) signatures?<br>
><br>
> Thanks,<br>
> Peter<br>
><br>
>> On Mar 1, 2016, at 12:12 PM, Rick Andrews <<a href="mailto:rick_andrews@symantec.com" target="_blank">rick_andrews@symantec.com</a>> wrote:<br>
>><br>
>> I'm cross-posting in case others want to participate in this discussion on<br>
>> the IETF TLS Working Group. They're having a debate on whether TLS 1.3<br>
>> should allow or require RSA-PSS signatures on TLS certificates.<br>
>><br>
>> It would be better to have the debate there instead of here, but I will<br>
>> cross-post if anyone has a burning need to share but not join the WG.<br>
>><br>
>> -Rick<br>
>><br>
>> ----------------------------------------------------------------------<br>
>><br>
>> Message: 1<br>
>> Date: Tue, 1 Mar 2016 21:20:39 +0200<br>
>> From: Yoav Nir <<a href="mailto:ynir.ietf@gmail.com" target="_blank">ynir.ietf@gmail.com</a>><br>
>> To: Alyssa Rowan <<a href="mailto:akr@akr.io" target="_blank">akr@akr.io</a>><br>
>> Cc: <a href="mailto:tls@ietf.org" target="_blank">tls@ietf.org</a><br>
>> Subject: Re: [TLS] RSA-PSS in TLS 1.3<br>
>> Message-ID: <<a href="mailto:BBA8149E-114A-49D3-8159-A87ADB545482@gmail.com" target="_blank">BBA8149E-114A-49D3-8159-A87ADB545482@gmail.com</a>><br>
>> Content-Type: text/plain; charset=utf-8<br>
>><br>
>><br>
>> On 1 Mar 2016, at 8:23 PM, Alyssa Rowan <<a href="mailto:akr@akr.io" target="_blank">akr@akr.io</a>> wrote:<br>
>><br>
>>>> [YN] It would be cool to ban PKCS#1.5 from certificates, but we are<br>
>>>> not the PKIX working group. Nor are we the CA/Browser forum.<br>
>>>> When a CA issues a certificate it has to work with every client and<br>
>>>> server out there, When we use TLS 1.3, the other side supports TLS<br>
>>>> 1.3 as well, so it?s fair to assume that it knows PSS.<br>
>>><br>
>>> Perhaps the PKIX working group and CAB/Forum could both use a friendly<br>
>>> reminder not to ignore how perilous using RSA PKCS#1 v1.5 still remains?<br>
>><br>
>> Neither you nor I can post in any of the CA/Browser forum?s lists, because<br>
>> neither of us has either a browser or a public CA.<br>
>><br>
>> There are some people who are active there and are reading this list, so<br>
>> they might take such a proposal there. I?m not very optimistic, though.<br>
>> While only CAs and browsers are members, they are keenly aware that even the<br>
>> public CAs have a wide variety of relying parties, running all sorts of<br>
>> software. And it?s much harder to scan clients than it is to scan servers,<br>
>> so it?s difficult to say how many clients will not be able to connect to a<br>
>> server with a certificate signed with RSA-PSS. Probably far too many for the<br>
>> CA/BF to be comfortable deprecating PKCS#1.<br>
>><br>
>> The PKIX working group has shut down several years ago. The Curdle WG is a<br>
>> new working group whose charter includes deprecating obsolete stuff. Perhaps<br>
>> they might be interested.<br>
>><br>
>> Yoav<br>
>><br>
>><br>
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