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fix: match Element Call HKDF params (ratchetWindowSize=10, keyringSize=256)

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Re-enable E2EE with corrected parameters matching Element Call defaults.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Christian Gick
2026-02-21 18:22:54 +02:00
parent 96183a8ccd
commit 67f4b8159e
1 changed files with 14 additions and 9 deletions
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23
voice.py
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@@ -70,13 +70,16 @@ KDF_HKDF = 1
def _build_e2ee_options(shared_key: bytes) -> rtc.E2EEOptions:
"""Build HKDF E2EE options matching Element Call's key derivation."""
"""Build HKDF E2EE options matching Element Call's key derivation.
Element Call uses: ratchetWindowSize=10, keyringSize=256, salt="LKFrameEncryptionKey"
"""
key_opts = rtc.KeyProviderOptions(
shared_key=shared_key,
ratchet_window_size=0,
ratchet_window_size=10,
ratchet_salt=b"LKFrameEncryptionKey",
failure_tolerance=-1,
key_ring_size=16,
failure_tolerance=10,
key_ring_size=256,
key_derivation_function=KDF_HKDF,
)
return rtc.E2EEOptions(key_provider_options=key_opts)
@@ -186,13 +189,15 @@ class VoiceSession:
break
await asyncio.sleep(0.1)
# TEMPORARY: Disable E2EE to test if audio pipeline works
if self._e2ee_key:
logger.info("Caller E2EE key available (%d bytes) — but E2EE DISABLED for testing",
len(self._e2ee_key))
shared_key = self._e2ee_key
logger.info("Using caller E2EE key (%d bytes)", len(shared_key))
if self._publish_key_cb:
self._publish_key_cb(self._e2ee_key)
e2ee_opts = None
self._publish_key_cb(shared_key)
e2ee_opts = _build_e2ee_options(shared_key)
else:
logger.warning("No caller E2EE key — connecting WITHOUT encryption")
e2ee_opts = None
room_opts = rtc.RoomOptions(e2ee=e2ee_opts)
self.lk_room = rtc.Room()