Function deriveHybridSymmetricKey

deriveHybridSymmetricKey(
    sharedSecret: Uint8Array,
    currentPSK: Uint8Array,
    ephemeralPublicKey: Uint8Array,
    senderPublicKey: Uint8Array,
    recipientPublicKey: Uint8Array,
): Uint8Array
Derives a hybrid symmetric key combining ECDH shared secret with PSK.
Parameters
- sharedSecret: Uint8Array
  ECDH shared secret (ephemeral * recipient)
- currentPSK: Uint8Array
  The current ratchet-derived PSK
- ephemeralPublicKey: Uint8Array
  Ephemeral public key (used as salt)
- senderPublicKey: Uint8Array
  Sender's static public key
- recipientPublicKey: Uint8Array
  Recipient's static public key
Returns Uint8Array
32-byte hybrid symmetric key
- Defined in src/psk/ratchet.ts:68