Re: [TLS] HSM-friendly Key Computation
Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Wed, 22 April 2015 17:35 UTC
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Date: Wed, 22 Apr 2015 20:35:26 +0300
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Robert Relyea <rrelyea@redhat.com>
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Subject: Re: [TLS] HSM-friendly Key Computation
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On Wed, Apr 22, 2015 at 10:02:50AM -0700, Robert Relyea wrote: > On 04/20/2015 09:37 AM, Ilari Liusvaara wrote: > > > >There are other places in TLS that fundamentally need to (indirectly) derive > >public data out of secret key material. > That's not a a problem. The problem is using the same mechanism to derive > the public data that we use to derive the keys. > It's even OK to use the same secret key for both (from an HSM POV). > > What Michael is saying is that there are existing functions for both KDF > (secret material -> key) and Mac (secret material-> unique public data). > He's requesting that TLS not have it's own versions of these functions. So would using two different PRF functions, one for parts that don't downgrade and another for parts that do downgrade (e.g. IV derivation, unique / finished calculations, exporter calculations, etc..) solve the issue? (Of course, the two functions should be closely related, so not to annoy software implementations too much)... -Ilari
- [TLS] HSM-friendly Key Computation Russ Housley
- Re: [TLS] HSM-friendly Key Computation Eric Rescorla
- Re: [TLS] HSM-friendly Key Computation Martin Thomson
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Yoav Nir
- Re: [TLS] HSM-friendly Key Computation Brian Smith
- Re: [TLS] HSM-friendly Key Computation Eric Rescorla
- Re: [TLS] HSM-friendly Key Computation Peter Gutmann
- Re: [TLS] HSM-friendly Key Computation Benjamin Beurdouche
- Re: [TLS] HSM-friendly Key Computation Michael StJohns
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation StJohns, Michael
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Robert Relyea
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Eric Rescorla
- Re: [TLS] HSM-friendly Key Computation Michael StJohns
- Re: [TLS] HSM-friendly Key Computation Eric Rescorla
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Eric Rescorla
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Michael StJohns
- Re: [TLS] HSM-friendly Key Computation Michael StJohns
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Michael StJohns
- Re: [TLS] HSM-friendly Key Computation Eric Rescorla
- Re: [TLS] HSM-friendly Key Computation Eric Rescorla
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Joseph Salowey
- Re: [TLS] HSM-friendly Key Computation Watson Ladd
- Re: [TLS] HSM-friendly Key Computation Ilari Liusvaara
- Re: [TLS] HSM-friendly Key Computation Hugo Krawczyk