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Fetch key for B&A request #1289

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Oct 1, 2024
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32 changes: 32 additions & 0 deletions spec.bs
Original file line number Diff line number Diff line change
Expand Up @@ -3195,6 +3195,21 @@ The <dfn for=Navigator method>getInterestGroupAdAuctionData(|configIDL|)</dfn> m
1. Let |p| be [=a new promise=].
1. Let |queue| be the result of [=starting a new parallel queue=].
1. [=parallel queue/enqueue steps|Enqueue the following steps=] to |queue|:
1. If |config|'s [=auction data config/coordinator=] is not one of the [=implementation-defined=]
coordinators supported by this [=user agent=]:
1. [=Queue a global task=] on the [=DOM manipulation task source=], given |global|, to
[=reject=] |p| with a {{TypeError}}.
1. Abort these steps.
1. Let |keyInfo| be the result of [=looking up the server encryption key=]
with config|'s [=auction data config/seller=] and |config|'s
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[=auction data config/coordinator=].
1. If |keyInfo| is failure:
1. [=Queue a global task=] on the [=DOM manipulation task source=], given |global|, to
[=reject=] |p| with a {{TypeError}}.
1. Abort these steps.
1. Let (|key|, |keyId|) be |keyInfo|.
1. Set |config|'s [=auction data config/encryption key=] to |key|.
1. Set |config|'s [=auction data config/encryption key id=] to |keyId|.
1. Let |igMap| be a new [=map=] whose [=map/keys=] are [=origins=] and [=map/values=] are [=lists=].
1. Let |startTime| be a [=moment=] equal to the [=current wall time=].
1. [=list/For each=] |ig| of the [=user agent=]'s [=interest group set=]:
Expand Down Expand Up @@ -3309,6 +3324,18 @@ The <dfn for=Navigator method>getInterestGroupAdAuctionData(|configIDL|)</dfn> m
1. Return |configs|.
</div>

<div algorithm>
To <dfn>look up the server encryption key</dfn> given an [=origin=] |seller|
and an [=origin=] |coordinator|:
1. Let |keys| be a [=list=] of ([=byte sequence=], [=byte=]) pairs returned
from looking up the [[RFC9180|HPKE]] public key encryption keys and their
corresponding key IDs for |seller| specified by |coordinator|. The actual
implementation of this lookup is [=implementation-defined=], and may
consist of fetching the keys from a known [=URL=].
1. If |keys| is failure or |keys| [=list/is empty=], return failure.
1. Return an element from |keys|, chosen at random.
</div>

# Reporting # {#reporting}

## {{InterestGroupBiddingAndScoringScriptRunnerGlobalScope/forDebuggingOnly}} ## {#for-debugging-only-header}
Expand Down Expand Up @@ -7657,6 +7684,11 @@ An <dfn>auction data config</dfn> is a [=struct=] with the following [=struct/it
: <dfn>coordinator</dfn>
:: The origin of the coordinator hosting public encryption keys for the server
running the ad auction. The [=origin/scheme=] must be "`https`".
: <dfn>encryption key</dfn>
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:: A [=byte sequence=]. The public [[RFC9180|HPKE]] encryption key to be used
to encrypt the request.
: <dfn>encryption key id</dfn>
:: An [=byte=] containing the key ID corresponding to the [=auction data config/encryption key=].
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: <dfn>request size</dfn>
:: {{unsigned long}} or null. An optional field, containing the desired size
for the returned encrypted request blob.
Expand Down
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