es256 not supported in some js environment

[clementh59]

Hi,

We built a Chrome extension that automatically reads and validates C2PA manifests.

It leverages c2pa-js in the background, which uses your library.
We noticed that some COSE signatures were not validated in the extension while it was when using the same library (c2pa) with the exact same manifest in a web app.
We created an issue in c2pa-js a few months ago.

We recently identified that the problem might come from c2pa-rs and not directly c2pa-js.
All the problematic signatures seem to use es256.

I provided a few examples and more context in the other issue.

Regards,
Clement from Digimarc

[mauricefisher64]

I think you address the issue on your own here: contentauth/c2pa-js#125