Re: [TLS] Entirely omitting context in draft-ietf-tls-extractor
<Pasi.Eronen@nokia.com> Mon, 22 February 2010 18:05 UTC
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From: Pasi.Eronen@nokia.com
To: ekr@networkresonance.com, tls@ietf.org
Date: Mon, 22 Feb 2010 19:06:19 +0100
Thread-Topic: [TLS] Entirely omitting context in draft-ietf-tls-extractor
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Subject: Re: [TLS] Entirely omitting context in draft-ietf-tls-extractor
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Not wearing any hats: This could potentially simplify TLS library APIs a bit (no need to provide special cases for EAP-TLS/EAP-TTLS). And since we require that one label can't be a prefix of any other label, this seems safe, too. So no objections from me as individual. Wearing AD hat: I'll wait for a week or so to see if there are objections before OK'ing this change with the RFC editor. Best regards, Pasi > -----Original Message----- > From: tls-bounces@ietf.org [mailto:tls-bounces@ietf.org] On Behalf Of > ext Eric Rescorla > Sent: 22 February, 2010 01:35 > To: tls@ietf.org > Subject: [TLS] Entirely omitting context in draft-ietf-tls-extractor > > During LC, we received a comment from Jouni Malinen that > unconditionally > including the context in the PRF created an unnecesssary > incompatibility > with exporter-type mechanisms in EAP-TLS and EAP-TTLS which could > otherwise > be retconned into being extractor usages. In order to address this, I > propose changing the text to read: > > > If no context is provided, it then computes: > > PRF(SecurityParameters.master_secret, label, > SecurityParameters.client_random + > SecurityParameters.server_random > )[length] > > If the context is provided, it computes:: > > PRF(SecurityParameters.master_secret, label, > SecurityParameters.client_random + > SecurityParameters.server_random + > context_value_length + context_value > )[length] > > Where PRF is the TLS PRF in use for the session. The output is a > pseudorandom bit string of length bytes generated from the > master_secret. (This construction allows for interoperability > with older exporter-type constructions which do not > use context values, e.g., [RFC5281]). > > Any objections? > > -Ekr > > > _______________________________________________ > TLS mailing list > TLS@ietf.org > https://www.ietf.org/mailman/listinfo/tls
- [TLS] Entirely omitting context in draft-ietf-tls… Eric Rescorla
- Re: [TLS] Entirely omitting context in draft-ietf… Joseph Salowey (jsalowey)
- Re: [TLS] Entirely omitting context in draft-ietf… Pasi.Eronen
- Re: [TLS] Entirely omitting context in draft-ietf… Michael Tüxen
- Re: [TLS] Entirely omitting context in draft-ietf… Pasi.Eronen