def generate_shared_secrets(self, public_key):
master_shared_key = ecdh(public_key, self.private_key)
def _derived(val):
return hmac_sha256(master_shared_key, bytearray([val]))
self.request_encryption_key = _derived(0)
self.request_hmac_key = _derived(1)
self.response_encryption_key = _derived(2)
self.response_hmac_key = _derived(3)
def get_shared_nonce(self, pubkey: bytes, script: bytes) -> bytes:
our_privkey = self.get_private_blinding_key(script)
nonce = wally.sha256(wally.ecdh(pubkey, our_privkey))
return nonce