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lnbase: attempt at making htlc_signature to send (currently remote fails due to wrong num_htlcs in commitment_signed)

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Janus 2018-04-26 17:37:01 +02:00 • committed by SomberNight
parent 7dabdad7a7
commit 8b4bdf6fc0
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2 changed files with 53 additions and 10 deletions
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59
lib/lnbase.py
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@ -780,7 +780,7 @@ class Peer(PrintError):
funding_index = funding_tx.outputs().index(funding_output)
# derive keys
localpubkey = derive_pubkey(base_point, remote_per_commitment_point)
localprivkey = derive_privkey(base_secret, remote_per_commitment_point)
#localprivkey = derive_privkey(base_secret, remote_per_commitment_point)
remotepubkey = derive_pubkey(remote_payment_basepoint, per_commitment_point_first)
revocation_pubkey = derive_blinded_pubkey(revocation_basepoint, remote_per_commitment_point)
remote_revocation_pubkey = derive_blinded_pubkey(remote_revocation_basepoint, per_commitment_point_first)
@ -864,9 +864,9 @@ class Peer(PrintError):
del self.remote_funding_locked[channel_id]
self.print_error('Done waiting for remote_funding_locked', remote_funding_locked_msg)
self.commitment_signed[channel_id] = asyncio.Future()
return channel_id, per_commitment_secret_seed, local_ctx_args, remote_funding_pubkey, remote_funding_locked_msg, remote_revocation_basepoint, remote_htlc_basepoint, htlc_basepoint, delayed_payment_basepoint
return channel_id, per_commitment_secret_seed, local_ctx_args, remote_funding_pubkey, remote_funding_locked_msg, remote_revocation_basepoint, remote_htlc_basepoint, htlc_basepoint, delayed_payment_basepoint, revocation_basepoint, remote_delayed_payment_basepoint, remote_delay, remote_dust_limit_satoshis, funding_privkey, htlc_privkey
async def receive_commitment_revoke_ack(self, channel_id, local_per_commitment_secret_seed, local_last_pcs_index, local_ctx_args, expected_received_sat, remote_funding_pubkey, local_next_commitment_number, remote_next_commitment_point, remote_revocation_basepoint, remote_htlc_basepoint, local_htlc_basepoint, delayed_payment_basepoint):
async def receive_commitment_revoke_ack(self, channel_id, local_per_commitment_secret_seed, local_last_pcs_index, local_ctx_args, expected_received_sat, remote_funding_pubkey, local_next_commitment_number, remote_next_commitment_point, remote_revocation_basepoint, remote_htlc_basepoint, local_htlc_basepoint, delayed_payment_basepoint, revocation_basepoint, remote_delayed_payment_basepoint, remote_delay, remote_dust_limit_satoshis, funding_privkey, payment_preimage, local_htlc_privkey):
try:
commitment_signed_msg = await self.commitment_signed[channel_id]
finally:
@ -893,27 +893,70 @@ class Peer(PrintError):
local_ctx_args = local_ctx_args._replace(remotepubkey = derive_pubkey(local_ctx_args.remote_payment_basepoint, local_next_per_commitment_point))
local_ctx_args = local_ctx_args._replace(local_delayedpubkey = derive_pubkey(delayed_payment_basepoint, local_next_per_commitment_point))
htlcs = [
htlcs_in_local = [
(
make_received_htlc(remote_revocation_pubkey, remote_htlc_pubkey, local_htlc_pubkey, payment_hash, cltv_expiry),
amount_msat
)
]
new_commitment = make_commitment(*local_ctx_args, htlcs=htlcs)
new_commitment = make_commitment(*local_ctx_args, htlcs=htlcs_in_local)
preimage_hex = new_commitment.serialize_preimage(0)
pre_hash = bitcoin.Hash(bfh(preimage_hex))
if not bitcoin.verify_signature(remote_funding_pubkey, commitment_signed_msg["signature"], pre_hash):
raise Exception('failed verifying signature of updated commitment transaction')
raise Exception('failed verifying signature of our updated commitment transaction')
htlc_sigs_len = len(commitment_signed_msg["htlc_signature"])
if htlc_sigs_len != 64:
raise Exception("unexpected number of htlc signatures: " + str(htlc_sigs_len))
# TODO: construct their commitment transaction (A), check that htlc_signature signs
# the HTLC transaction (B) that spends from the offered HTLC output in (A)
pubkeys = sorted([bh2u(local_ctx_args.funding_pubkey), bh2u(remote_funding_pubkey)])
localpubkey = derive_pubkey(local_ctx_args.base_point, remote_next_commitment_point)
revocation_pubkey = derive_blinded_pubkey(revocation_basepoint, remote_next_commitment_point)
remote_delayedpubkey = derive_pubkey(remote_delayed_payment_basepoint, remote_next_commitment_point)
# TODO check payment_hash
htlcs_in_remote = [(make_offered_htlc(revocation_pubkey, local_htlc_pubkey, remote_htlc_pubkey, payment_hash), amount_msat)]
remote_ctx = make_commitment(
1,
remote_funding_pubkey, local_ctx_args.funding_pubkey, localpubkey,
local_ctx_args.base_point, local_ctx_args.remote_payment_basepoint,
revocation_pubkey, remote_delayedpubkey, remote_delay,
local_ctx_args.funding_txid, local_ctx_args.funding_index, local_ctx_args.funding_satoshis,
local_ctx_args.local_amount, local_ctx_args.remote_amount, remote_dust_limit_satoshis, local_ctx_args.local_feerate, FOR_REMOTE, htlcs=htlcs_in_remote)
remote_ctx.sign({bh2u(local_ctx_args.funding_pubkey): (funding_privkey, True)})
sig_index = pubkeys.index(bh2u(local_ctx_args.funding_pubkey))
sig = bytes.fromhex(remote_ctx.inputs()[0]["signatures"][sig_index])
r, s = sigdecode_der(sig[:-1], SECP256k1.generator.order())
sig_64 = sigencode_string_canonize(r, s, SECP256k1.generator.order())
# TODO do not copy their cltv expiry
self.send_message(gen_msg("update_add_htlc", channel_id=channel_id, id=0, amount_msat=amount_msat, payment_hash=payment_hash, cltv_expiry=cltv_expiry))
await asyncio.sleep(1)
self.send_message(gen_msg("revoke_and_ack", channel_id=channel_id, per_commitment_secret=local_last_per_commitment_secret, next_per_commitment_point=local_next_per_commitment_point))
await asyncio.sleep(1)
htlc_tx_output = make_htlc_tx_output(
amount_msat = amount_msat,
local_feerate = local_ctx_args.local_feerate,
revocationpubkey=revocation_pubkey,
local_delayedpubkey=local_ctx_args.local_delayedpubkey,
success = True)
htlc_tx_inputs = make_htlc_tx_inputs(
htlc_output_txid=new_commitment.txid(),
htlc_output_index=1, # TODO find index of htlc output in new_commitment
revocationpubkey=revocation_pubkey,
local_delayedpubkey=local_ctx_args.local_delayedpubkey,
amount_msat=amount_msat,
witness_script=bh2u(htlcs_in_local[0][0]))
htlc_tx = make_htlc_tx(cltv_expiry, inputs=htlc_tx_inputs, output=htlc_tx_output)
#htlc_sig should sign the HTLC transaction that spends from OUR commitment transaction's received_htlc output
sig = bfh(htlc_tx.sign_txin(0, local_htlc_privkey))
r, s = sigdecode_der(sig[:-1], SECP256k1.generator.order())
htlc_sig = sigencode_string_canonize(r, s, SECP256k1.generator.order())
self.send_message(gen_msg("commitment_signed", channel_id=channel_id, signature=sig_64, num_htlcs=1, htlc_signature=htlc_sig))
await asyncio.sleep(1)
async def fulfill_htlc(self, channel_id, htlc_id, payment_preimage):
self.send_message(gen_msg("update_fulfill_htlc", channel_id=channel_id, id=htlc_id, payment_preimage=payment_preimage))

4
lib/tests/test_lnbase_online.py
View file

@ -50,12 +50,12 @@ if __name__ == "__main__":
async def async_test():
payment_preimage = bytes.fromhex("01"*32)
RHASH = sha256(payment_preimage)
channel_id, per_commitment_secret_seed, local_ctx_args, remote_funding_pubkey, remote_funding_locked_msg, remote_revocation_basepoint, remote_htlc_basepoint, local_htlc_basepoint, delayed_payment_basepoint = await peer.channel_establishment_flow(wallet, config, funding_satoshis, push_msat)
channel_id, per_commitment_secret_seed, local_ctx_args, remote_funding_pubkey, remote_funding_locked_msg, remote_revocation_basepoint, remote_htlc_basepoint, local_htlc_basepoint, delayed_payment_basepoint, revocation_basepoint, remote_delayed_payment_basepoint, remote_delay, remote_dust_limit_satoshis, funding_privkey, local_htlc_privkey = await peer.channel_establishment_flow(wallet, config, funding_satoshis, push_msat)
expected_received_sat = 400000
pay_req = lnencode(LnAddr(RHASH, amount=Decimal("0.00000001")*expected_received_sat, tags=[('d', 'one cup of coffee')]), peer.privkey[:32])
print("payment request", pay_req)
last_pcs_index = 2**48 - 1
await peer.receive_commitment_revoke_ack(channel_id, per_commitment_secret_seed, last_pcs_index, local_ctx_args, expected_received_sat, remote_funding_pubkey, local_next_commitment_number=1, remote_next_commitment_point=remote_funding_locked_msg["next_per_commitment_point"], remote_revocation_basepoint=remote_revocation_basepoint, remote_htlc_basepoint=remote_htlc_basepoint, local_htlc_basepoint=local_htlc_basepoint, delayed_payment_basepoint=delayed_payment_basepoint)
await peer.receive_commitment_revoke_ack(channel_id, per_commitment_secret_seed, last_pcs_index, local_ctx_args, expected_received_sat, remote_funding_pubkey, local_next_commitment_number=1, remote_next_commitment_point=remote_funding_locked_msg["next_per_commitment_point"], remote_revocation_basepoint=remote_revocation_basepoint, remote_htlc_basepoint=remote_htlc_basepoint, local_htlc_basepoint=local_htlc_basepoint, delayed_payment_basepoint=delayed_payment_basepoint, revocation_basepoint=revocation_basepoint, remote_delayed_payment_basepoint=remote_delayed_payment_basepoint, remote_delay=remote_delay, remote_dust_limit_satoshis=remote_dust_limit_satoshis, funding_privkey=funding_privkey, local_htlc_privkey=local_htlc_privkey, payment_preimage=payment_preimage)
htlc_id = 0 # TODO should correspond with received htlc (when handling more than just one update)
await peer.fulfill_htlc(channel_id, htlc_id, payment_preimage)
while True: