Re: [TLS] Length of a variable-length vector: zero-length case

Eric Rescorla <ekr@rtfm.com> Fri, 22 January 2016 16:51 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 22 Jan 2016 08:50:53 -0800
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To: =JeffH <Jeff.Hodges@kingsmountain.com>
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Cc: IETF TLS WG <tls@ietf.org>
Subject: Re: [TLS] Length of a variable-length vector: zero-length case
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On Fri, Jan 22, 2016 at 7:50 AM, =JeffH <Jeff.Hodges@kingsmountain.com>
wrote:

> wrt https://tools.ietf.org/html/draft-ietf-tls-tls13-11#section-4.3
>
> if we have..
>
>   opaque foo<0..2^16-1>;
>
> ..with a floor length of zero, thus with an instantiation of foo of zero
> length, we actually will have in terms of encoded bytes on the wire (in
> hex)..
>
>   00 00
>
> ..where this is the 2-byte length field, with length value zero, and a
> zero-length (ie, absent, empty) vector content, correct ?


Yes.

-Ekr


>
>
thanks,
>
> =JeffH
>
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[TLS] Length of a variable-length vector: zero-le… =JeffH
Re: [TLS] Length of a variable-length vector: zer… Eric Rescorla