Re: [TLS] Simplifying signature algorithm negotiation

Eric Rescorla <ekr@rtfm.com> Mon, 21 March 2016 02:19 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Sun, 20 Mar 2016 19:18:39 -0700
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To: Joseph Salowey <joe@salowey.net>
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Cc: ekr <notifications@github.com>, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] Simplifying signature algorithm negotiation
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Acknowledged. This will be in draft-12.


On Sun, Mar 20, 2016 at 5:27 PM, Joseph Salowey <joe@salowey.net>; wrote:

> No objection,  it looks good.  I don't see any objections on the list so I
> say merge it.
>
> On Sun, Mar 20, 2016 at 10:50 AM, Eric Rescorla <ekr@rtfm.com>; wrote:
>
>> It sounds like we have general consensus here. Does anyone object to my
>> merging
>> this PR?
>>
>> -Ekr
>>
>>
>> On Thu, Mar 17, 2016 at 10:34 AM, Ilari Liusvaara <
>> ilariliusvaara@welho.com>; wrote:
>>
>>> On Tue, Mar 15, 2016 at 05:37:20PM +0000, David Benjamin wrote:
>>> > On Mon, Mar 14, 2016 at 8:22 PM Eric Rescorla <ekr@rtfm.com>; wrote:
>>> >
>>> >
>>> > I would probably characterize it less as suites vs orthogonality, but
>>> as
>>> > wanting to keep divisions in meaningful and universal places and not
>>> > splitting up tightly-coupled decisions. The flexibility from
>>> orthogonality
>>> > can be handy, but going too far---as I believe TLS 1.2 did with
>>> signature,
>>> > prehash, and curve---complicates everything. Imagine if negotiating
>>> > AES_128_GCM required separately negotiating block cipher AES-128, mode
>>> CTR,
>>> > and MAC GHASH.
>>>
>>> It isn't even orthogonal, it is coupled, which is way worse and quite
>>> difficult to implement correctly.
>>>
>>> I now consider the way TLS 1.3 draft / RFC4492bis draft currently does
>>> EdDSA negotiation a bad idea (what is proposed here is vast improvement).
>>>
>>>
>>> -Ilari
>>>
>>
>>
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>