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Re: [rtcweb] A couple of questions on SDP Identity attribute

Harald Alvestrand <harald@alvestrand.no> Thu, 11 October 2018 11:02 UTC

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From: Harald Alvestrand <harald@alvestrand.no>
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Date: Thu, 11 Oct 2018 13:01:57 +0200
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Subject: Re: [rtcweb] A couple of questions on SDP Identity attribute
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Den 11. okt. 2018 09:23, skrev Christer Holmberg:
> Hi,
> 
>  
> 
> A couple of questions related to some comments on GitHub:
> 
>  
> 
> Q1: In an offer or answer, it allowed to include fingerprints that have
> NOT been used to assert the identity?

I don't understand the question..... if you don't assert an identity,
there are of course fingerprints that have not been used to assert the
identity.

Was the question about the case where you include an identity attribute?

> 
>  
> 
> Q2: If one or more of the fingerprints used to assert the identity
> change, I assume that the Identity attribute value will always changes a
> result? Or, is there a chance that different fingerprints would produce
> the same Identity attribute value?

A fingerprint can't really "change".
There may be new fingerprints because of new hash functions added
(though that would be strange over the time of a call), or because new
certificates were added to the session.

> 
>  
> 
> Regards,
> 
>  
> 
> Christer
> 
>  
> 
>  
> 
> 
> 
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