[TLS] Next steps for Client Certificate URL

[<Pasi.Eronen at nokia.com>]

Hi,

We've seen two replies from people who have implemented the Client
Certificate URL extension (Certicom SSL-C toolkit and IAIK iSaSiLk).

Given that using this feature -- at least on client side -- probably
requires that the application specifically asks for it (and supplies
the URL in some API call), I would also guess that most applications
that use those two libraries don't actually use this particular
feature.

Given this, would everyone be OK with updating the existing
client_certificate_url extension so that including the hash is
mandatory (client MUST send, server MUST NOT accept without hash)?
This behavior would be independent of the negotiated TLS version.

(One obvious alternative would be to deprecate current
client_certificate_url, and allocate a new extension number.)

Best regards,
Pasi
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