Re: [TLS] Issue #964: Shortened HKDF labels
Martin Thomson <martin.thomson@gmail.com> Wed, 26 April 2017 06:51 UTC
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From: Martin Thomson <martin.thomson@gmail.com>
Date: Wed, 26 Apr 2017 16:51:01 +1000
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To: Eric Rescorla <ekr@rtfm.com>
Cc: Dave Garrett <davemgarrett@gmail.com>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [TLS] Issue #964: Shortened HKDF labels
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Unsurprisingly, this was easy to implement. If anyone else is tracking this closely, I can share a version of NSS that includes this change (and pretends to be an implementation of -20). On 26 April 2017 at 07:50, Eric Rescorla <ekr@rtfm.com> wrote: > PR here: > https://github.com/tlswg/tls13-spec/pull/977 > > On Mon, Apr 24, 2017 at 8:12 PM, Eric Rescorla <ekr@rtfm.com> wrote: >> >> >> >> On Mon, Apr 24, 2017 at 6:08 PM, Dave Garrett <davemgarrett@gmail.com> >> wrote: >>> >>> On Monday, April 24, 2017 07:21:13 pm Eric Rescorla wrote: >>> > Hence, the following proposal for the complete label, where the longest >>> > string is 18 bytes. >>> > >>> > 16 tls13 ext binder # was external psk binder key >>> > 16 tls13 res binder # was resumption psk binder key >>> > 17 tls13 c e traffic # was client early traffic secret >>> > 18 tls13 e exp master # was early exporter master secret >>> > 18 tls13 c hs traffic # was client handshake traffic secret >>> > 18 tls13 s hs traffic # was server handshake traffic secret >>> > 18 tls13 c ap traffic # was client application traffic secret >>> > 18 tls13 s ap traffic # was server application traffic secret >>> > 16 tls13 exp master # was exporter master secret >>> > 16 tls13 res master # was resumption master secret >>> > 9 tls13 key # was key >>> > 8 tls13 iv # was iv >>> > 14 tls13 finished # was finished >>> > 17 tls13 traffic upd # was application traffic secret >>> > 14 tls13 exporter # was exporter >>> > 13 tls13 derived # was derived >>> > >>> > Further bikeshedding? >>> >>> I think "tls13 c e traffic" is the only one that could be tweaked to be a >>> little more obvious. Abbreviating "early data" as "ed", instead of just >>> "early" as "e", would still fit and follow the same pattern as the other >>> traffic labels. >> >> >> Unfortunately this woud explode tls13 e exp master. >> >> -Ekr >> >>> Other than that, this sounds fine. >>> >>> >>> Dave >> >> > > > _______________________________________________ > TLS mailing list > TLS@ietf.org > https://www.ietf.org/mailman/listinfo/tls >
- [TLS] Issue #964: Shortened HKDF labels Eric Rescorla
- Re: [TLS] Issue #964: Shortened HKDF labels Eric Rescorla
- Re: [TLS] Issue #964: Shortened HKDF labels Ilari Liusvaara
- Re: [TLS] Issue #964: Shortened HKDF labels Eric Rescorla
- Re: [TLS] Issue #964: Shortened HKDF labels Ilari Liusvaara
- Re: [TLS] Issue #964: Shortened HKDF labels Dave Garrett
- Re: [TLS] Issue #964: Shortened HKDF labels Benjamin Kaduk
- Re: [TLS] Issue #964: Shortened HKDF labels Eric Rescorla
- Re: [TLS] Issue #964: Shortened HKDF labels Salz, Rich
- Re: [TLS] Issue #964: Shortened HKDF labels Benjamin Kaduk
- Re: [TLS] Issue #964: Shortened HKDF labels Eric Rescorla
- Re: [TLS] Issue #964: Shortened HKDF labels Benjamin Kaduk
- Re: [TLS] Issue #964: Shortened HKDF labels Eric Rescorla
- Re: [TLS] Issue #964: Shortened HKDF labels Dave Garrett
- Re: [TLS] Issue #964: Shortened HKDF labels Eric Rescorla
- Re: [TLS] Issue #964: Shortened HKDF labels Ilari Liusvaara
- Re: [TLS] Issue #964: Shortened HKDF labels Martin Thomson