Re: [TLS] I-D Action: draft-ietf-tls-tlsflags-00.txt
Hi. This is an almost exact copy of draft-nir-tls-tlsflags-02. Since that is the draft that was adopted, I submitted at as the -00 version. I will reply to comments that came up during the adoption call later today or tomorrow, but feel free to comment some more. Yoav > On 12 Aug 2019, at 20:48, internet-dra...@ietf.org wrote: > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Transport Layer Security WG of the IETF. > >Title : A Flags Extension for TLS 1.3 >Author : Yoav Nir > Filename: draft-ietf-tls-tlsflags-00.txt > Pages : 6 > Date: 2019-08-12 > > Abstract: > A number of extensions are proposed in the TLS working group that > carry no interesting information except the 1-bit indication that a > certain optional feature is supported. Such extensions take 4 octets > each. This document defines a flags extension that can provide such > indications at an average marginal cost of 1 bit each. More > precisely, it provides as many flag extensions as needed at 4 + the > order of the last set bit divided by 8. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-tls-tlsflags/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-tls-tlsflags-00 > https://datatracker.ietf.org/doc/html/draft-ietf-tls-tlsflags-00 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > ___ > TLS mailing list > TLS@ietf.org > https://www.ietf.org/mailman/listinfo/tls ___ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
Re: [TLS] I-D Action: draft-ietf-tls-tlsflags-00.txt
On Mon, Aug 12, 2019 at 10:48:55AM -0700, internet-dra...@ietf.org wrote:
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Transport Layer Security WG of the IETF.
>
> Title : A Flags Extension for TLS 1.3
> Author : Yoav Nir
> Filename: draft-ietf-tls-tlsflags-00.txt
> Pages : 6
> Date: 2019-08-12
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tls-tlsflags/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-tls-tlsflags-00
> https://datatracker.ietf.org/doc/html/draft-ietf-tls-tlsflags-00
Two things:
1) uint8 flags<0..31>;
That adds an extra byte that is not technically necressary (because
extensions have lengths anyway) and limits number of flags to 248
(which might be enough).
And I do not think the length of flags field can be 0 (if it would
be, one could just omit the extension).
2) I think the bit order within octets should be reversed
That is, pack flags so that 0 is LSB of first octet, 7 is MSB of
first octet, 8 is LSB of second octet and so on.
Then one can read status flags by index with code like:
fn read_flag(flags: &[u8], idx: usize) -> bool
{
*flags.get(idx/8).unwrap_or(&0) >> idx%8 & 1 != 0
}
(That code will also happily handle out-of-array flags by reading
them as false.)
-Ilari
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[TLS] I-D Action: draft-ietf-tls-tlsflags-00.txt
A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Transport Layer Security WG of the IETF. Title : A Flags Extension for TLS 1.3 Author : Yoav Nir Filename: draft-ietf-tls-tlsflags-00.txt Pages : 6 Date: 2019-08-12 Abstract: A number of extensions are proposed in the TLS working group that carry no interesting information except the 1-bit indication that a certain optional feature is supported. Such extensions take 4 octets each. This document defines a flags extension that can provide such indications at an average marginal cost of 1 bit each. More precisely, it provides as many flag extensions as needed at 4 + the order of the last set bit divided by 8. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tls-tlsflags/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tls-tlsflags-00 https://datatracker.ietf.org/doc/html/draft-ietf-tls-tlsflags-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ ___ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
