Re: What happended to SecretAgreee?

Yes, Key agreement algorithms (which DH Phase 2 is - agreement of the
secret Z based on the exchanged parameters) is treated as a key derivation
algorithm.

Can you provide any examples of algorithms or parameters you do not believe
fits into the deriveKey mechanism?

I wasn't sure if your "and maybe a new key derivation algorithm" indicated
a degree of uncertainty. If so, yes, that is exactly the workflow - for
example, if you wanted to feed Z into HDKF to extract/expand.


On Thu, Feb 27, 2014 at 12:21 PM, Jim Schaad <ietf@augustcellars.com> wrote:

> No, that is not true.
>
> secretAgreement when from a key agree algorithm to a key derivation
> algorithm
>
> deriveBits and deriveKey go from a key derivation algoritm to  either a
> byte array or a symmetric keying algorithm (or maybe a new key derivation
> algorithm)
>
> jim
>
>
> From: Ryan Sleevi [mailto:sleevi@google.com]
> Sent: Thursday, February 27, 2014 12:05 PM
> To: Jim Schaad
> Cc: public-webcrypto@w3.org
> Subject: Re: What happended to SecretAgreee?
>
> The names were changed, but the behaviours the same.
>
> deriveBits and deriveKey.
>
> On Thu, Feb 27, 2014 at 12:00 PM, Jim Schaad <ietf@augustcellars.com>
> wrote:
> At one point, I thought there was an agreement to add a new function to
> the SubtleCrypto interface called secretAgreement.  This never happened.
>
> Was there a decision that I missed where this either was either not
> actually decided or was reversed?
>
> Jim
>
>
>
>