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Re: Key id

From: Mitch Zollinger <mzollinger@netflix.com>
Date: Tue, 4 Sep 2012 17:42:04 -0700
Message-ID: <50469FDC.6000802@netflix.com>
To: Ryan Sleevi <sleevi@google.com>
CC: "public-webcrypto@w3.org" <public-webcrypto@w3.org>
On 9/4/12 3:33 PM, Ryan Sleevi wrote:
> On Tue, Sep 4, 2012 at 12:07 PM, Mitch Zollinger <mzollinger@netflix.com> wrote:
>> Regarding Section 11.2:
>>
>> id
>>
>> For all Keys visible within a given origin, each Key shall have a unique, opaque identifier assigned that may be used to uniquely identify that Key within the set of keys.
>>
>> Within the same origin, if two Keys are created from the same underlying keying material, they MUST share the same id.
>>
>>
>> What is meant by "if two Keys are created from the same underlying keying material" here?
>>
>> Does this mean that if I have some key material that I use as an AES key in one case and as a 3DES key in another, they will have the same ID?
>
> Thanks for pointing out the ambiguity, caused by an assumption on my
> part on the implementation details.
>
> The /intent/ was for implementations that use handles from underlying
> cryptographic providers, that the ID remains the same. This was in
> anticipation of things like key querying, which multiple queries
> should return the same key ID for the same logical key.
>
> That said, it may be inappropriately overspecified here, in addition
> to the ambiguity. I'll see if I can find a better way to word this (or
> suggestions welcome, or perhaps it's unnecessary), but the intent was
> that algorithm was part of the identity of the underlying key - ergo,
> two different IDs.
>
>> Also, would the algorithm be such that if my keying material on one device matched the keying material on another device that this ID would be identical for the same origin?
> No statement is made one way or the other. This is a user agent (eg:
> purely client side) behaviour. As long as an implementation meets
> those criteria, I would expect it to be fine. So they may share the
> same ID between devices, or they may be unique between devices.
>

Ok. That's what we were hoping for.

Mitch
Received on Wednesday, 5 September 2012 00:42:32 GMT

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