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Re: [TLS] ECH-13 HRR Signal Derivation

Christopher Wood <caw@heapingbits.net> Thu, 02 September 2021 12:48 UTC

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Date: Thu, 02 Sep 2021 05:47:56 -0700
From: Christopher Wood <caw@heapingbits.net>
To: "TLS@ietf.org" <tls@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/pOSKefATiEqF5RGcwQYUL1Xrlbs>
Subject: Re: [TLS] ECH-13 HRR Signal Derivation
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On Thu, Sep 2, 2021, at 1:42 AM, Dennis Jackson wrote:
> I have two questions about the transcript for the confirmation signal 
> <https://www.ietf.org/archive/id/draft-ietf-tls-esni-13.html#name-sending-helloretryrequest-2> for HelloRetryRequests in ECH Draft 13: 
> 
> 1. Should ClientHelloInner1 be replaced with a message_hash message as in TLS? 
> 
> 2. Is the entire HelloRetryRequest (with overwritten placeholder value) 
> included in the transcript or is the HRR only included up to the end of 
> the placeholder value? 
> 
> I had assumed 1. yes and 2. the entire HRR, but an off-list 
> conversation left me unsure. 

That matches my interpretation of the text, though I see why (1) is not all that clear. If others agree, would you mind filing an issue to help clarify?

Thanks,
Chris

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