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Re: [TLS] Confirming Consensus: Negotiating upper layer protocols

Yoav Nir <ynir@checkpoint.com> Fri, 08 February 2013 11:41 UTC

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From: Yoav Nir <ynir@checkpoint.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
Thread-Topic: [TLS] Confirming Consensus: Negotiating upper layer protocols
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Date: Fri, 08 Feb 2013 11:41:27 +0000
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Subject: Re: [TLS] Confirming Consensus: Negotiating upper layer protocols
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On Feb 8, 2013, at 12:51 PM, Peter Gutmann <pgut001@cs.auckland.ac.nz> wrote:

> Eric Rescorla <ekr@rtfm.com> writes:
> 
>> WG members, please provide any comments on whether we should take this work
>> on by February 21. Additionally, if you wish to propose an alternative, it
>> would be nice if you could do so soon or at least provide an indication of
>> interest.
> 
> A comment on both of these proposals, to encode their protocols they use an
> ad-hoc, non-TLS-style encoding whose form is rather unclear:
> 
>  Protocols are named by IANA registered, opaque, non-empty byte strings and
>  the list of protocols is serialized as a concatenation of 8-bit, length
>  prefixed byte strings.
> 
> Does this mean the strings use 8-bit chars, the lengths are 8 bit, both, or
> neither?  What's wrong with:

I agree that it's not clean, but I took it to mean ...serialized as a concatenation of (((8-bit length) prefixed) byte strings)

So a byte length followed by that many bytes of string, followed by another byte length, and so on.

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