Function deriveSenderKey

deriveSenderKey(
    senderSharedSecret: Uint8Array,
    currentPSK: Uint8Array,
    ephemeralPublicKey: Uint8Array,
    senderPublicKey: Uint8Array,
): Uint8Array
Derives a sender key for encrypting the symmetric key (bidirectional decryption).
Parameters
- senderSharedSecret: Uint8Array
  ECDH shared secret (ephemeral * sender)
- currentPSK: Uint8Array
  The current ratchet-derived PSK
- ephemeralPublicKey: Uint8Array
  Ephemeral public key (used as salt)
- senderPublicKey: Uint8Array
  Sender's static public key
Returns Uint8Array
32-byte sender encryption key
- Defined in src/psk/ratchet.ts:89