I was waiting for the prf to be implemented since a long time exactly for this type of applications (e2e encryption), but , as usual, Safari doesn't support it
Huh, iCloud Keychain supports the prf extension when used with Chrome, so I had assumed they added support to Safari as well, but I just tested it and sure enough, you're right.
Edit: well https://webauthn-passkeys-prf-demo.explore.corbado.com/ works with an iCloud Keychain passkey on Safari on macOS 15.5, but Typage doesn't work with a YubiKey 5, so there is some support (the MDN data is out of date) but also something weird.
https://developer.mozilla.org/en-US/docs/Web/API/Web_Authent...