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Add warning about sending PRF outputs to server #2183

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Oct 29, 2024
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Add warning about sending PRF outputs to server #2183

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9 changes: 9 additions & 0 deletions index.bs
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Expand Up @@ -7510,6 +7510,15 @@ Note: this extension may be implemented for [=authenticators=] that do not use [

: <dfn>results</dfn>
:: The results of evaluating the PRF for the inputs given in {{AuthenticationExtensionsPRFInputs/eval}} or {{AuthenticationExtensionsPRFInputs/evalByCredential}}. Outputs may not be available during [=registration=]; see comments in {{AuthenticationExtensionsPRFInputs/eval}}.

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For some use cases, for example if PRF outputs are used to derive encryption keys to use only on the client side,
it may be necessary to omit this {{AuthenticationExtensionsPRFOutputs/results}} output
if the {{PublicKeyCredential}} is sent to a remote server,
for example to perform the procedures in [[#sctn-rp-operations]].
Note in particular that the {{RegistrationResponseJSON}} and {{AuthenticationResponseJSON}}
returned by <code>{{PublicKeyCredential}}.{{PublicKeyCredential/toJSON()}}</code>
will include this {{AuthenticationExtensionsPRFOutputs/results}} output if present.
</div>

### Large blob storage extension (<dfn>largeBlob</dfn>) ### {#sctn-large-blob-extension}
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