[feature] Option to choose key derivation function #974
Description
Is your feature request related to a problem? Please describe.
I am working on implementing end to end encrypted calls compatible with Element Call which is also using LiveKit. However, it is currently not possible for me to decrypt remote streams, as Element Call uses HKDF to derive keys, and this sdk currently is hardcoded to use PBKDF2.
Describe the solution you'd like
Providing some API to select different derivation function
Describe alternatives you've considered
I've made a simple patch to just replace PBKDF2 with HKDF as a test f05718e and it has allowed me to properly decrypt remote streams.
I made this patch only for the web implementation as it was easier to debug, but ideally it should be possible to use HKDF with the native implementation as well
Additional context
I'm willing to help work on implementation of this, but would appreciate some guidance from maintainers on how to best approach it.