Christian Gick dec6eee726 fix: use default PBKDF2 KDF instead of custom Rust HKDF for E2EE ...

The custom HKDF=1 path in the Rust FFI fork (EC-compat-changes)
produces different derived keys than the JS SDK's libwebrtc C++.
Switching to PBKDF2=0 lets libwebrtc's built-in C++ FrameCryptor
handle key derivation identically to how the JS SDK does it.

Also aligned ratchet_window_size=0 and key_ring_size=16 to match
Element Call JS SDK defaults (were 10 and 256).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-24 10:21:23 +02:00

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