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electrum
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lnbase: move channel commitment number increment to function

dependabot/pip/contrib/deterministic-build/ecdsa-0.13.3
Janus 7 years ago
committed by ThomasV
parent
2a594e9d0e
commit
2338d18ab8
1 changed files with 29 additions and 22 deletions
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  1. 51
      lib/lnbase.py

51
lib/lnbase.py
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@ -941,8 +941,11 @@ class Peer(PrintError):
# }
if channel_reestablish_msg["my_current_per_commitment_point"] != bfh(chan.remote_state.commitment_points[-1]):
raise Exception("Remote PCP mismatch")
n = chan.remote_state.ctn
self.send_message(gen_msg("channel_reestablish", channel_id=chan.channel_id, next_local_commitment_number=n+2, next_remote_revocation_number=n+1))
self.send_message(gen_msg("channel_reestablish",
channel_id=chan.channel_id,
next_local_commitment_number=chan.local_state.ctn+1,
next_remote_revocation_number=chan.remote_state.ctn+1
))
return chan
@ -970,7 +973,7 @@ class Peer(PrintError):
finally:
del self.local_funding_locked[channel_id]
per_commitment_secret_index = 2**48 - (chan.local_state.ctn + 1) - 1
per_commitment_secret_index = 2**48 - 2
per_commitment_point_second = secret_to_pubkey(int.from_bytes(
get_per_commitment_secret_from_seed(chan.local_state.per_commitment_secret_seed, per_commitment_secret_index), 'big'))
self.send_message(gen_msg("funding_locked", channel_id=channel_id, next_per_commitment_point=per_commitment_point_second))
@ -984,8 +987,18 @@ class Peer(PrintError):
return chan._replace(remote_state=chan.remote_state._replace(next_per_commitment_point=remote_funding_locked_msg["next_per_commitment_point"]))
async def receive_commitment_revoke_ack(self, chan, expected_received_sat, payment_preimage):
def derive_and_incr():
nonlocal chan
last_secret = get_per_commitment_secret_from_seed(chan.local_state.per_commitment_secret_seed, 2**48-chan.local_state.ctn-1)
next_secret = get_per_commitment_secret_from_seed(chan.local_state.per_commitment_secret_seed, 2**48-chan.local_state.ctn-2)
next_point = secret_to_pubkey(int.from_bytes(next_secret, 'big'))
chan = chan._replace(
local_state=chan.local_state._replace(
ctn=chan.local_state.ctn + 1
)
)
return last_secret, next_point
channel_id = chan.channel_id
local_per_commitment_secret_seed = chan.local_state.per_commitment_secret_seed
try:
commitment_signed_msg = await self.commitment_signed[channel_id]
finally:
@ -999,13 +1012,12 @@ class Peer(PrintError):
assert amount_msat // 1000 == expected_received_sat
payment_hash = htlc["payment_hash"]
local_next_per_commitment_secret = get_per_commitment_secret_from_seed(local_per_commitment_secret_seed, 2**48-chan.local_state.ctn-2)
local_next_per_commitment_point = secret_to_pubkey(int.from_bytes(local_next_per_commitment_secret, 'big'))
last_secret, next_point = derive_and_incr()
remote_htlc_pubkey = derive_pubkey(chan.remote_config.htlc_basepoint.pubkey, local_next_per_commitment_point)
local_htlc_pubkey = derive_pubkey(chan.local_config.htlc_basepoint.pubkey, local_next_per_commitment_point)
remote_htlc_pubkey = derive_pubkey(chan.remote_config.htlc_basepoint.pubkey, next_point)
local_htlc_pubkey = derive_pubkey(chan.local_config.htlc_basepoint.pubkey, next_point)
remote_revocation_pubkey = derive_blinded_pubkey(chan.remote_config.revocation_basepoint.pubkey, local_next_per_commitment_point)
remote_revocation_pubkey = derive_blinded_pubkey(chan.remote_config.revocation_basepoint.pubkey, next_point)
htlcs_in_local = [
(
@ -1014,7 +1026,7 @@ class Peer(PrintError):
)
]
new_commitment = make_commitment_using_open_channel(chan, chan.local_state.ctn+1, True, local_next_per_commitment_point,
new_commitment = make_commitment_using_open_channel(chan, chan.local_state.ctn, True, next_point,
chan.local_state.amount_sat,
chan.remote_state.amount_sat - expected_received_sat,
htlcs_in_local)
@ -1028,10 +1040,9 @@ class Peer(PrintError):
if htlc_sigs_len != 64:
raise Exception("unexpected number of htlc signatures: " + str(htlc_sigs_len))
local_last_per_commitment_point = local_next_per_commitment_point
htlc_tx = make_htlc_tx_with_open_channel(chan, local_last_per_commitment_point, True, True, amount_msat, cltv_expiry, payment_hash, new_commitment, 0)
htlc_tx = make_htlc_tx_with_open_channel(chan, next_point, True, True, amount_msat, cltv_expiry, payment_hash, new_commitment, 0)
pre_hash = bitcoin.Hash(bfh(htlc_tx.serialize_preimage(0)))
remote_htlc_pubkey = derive_pubkey(chan.remote_config.htlc_basepoint.pubkey, local_last_per_commitment_point)
remote_htlc_pubkey = derive_pubkey(chan.remote_config.htlc_basepoint.pubkey, next_point)
if not bitcoin.verify_signature(remote_htlc_pubkey, commitment_signed_msg["htlc_signature"], pre_hash):
raise Exception("failed verifying signature an HTLC tx spending from one of our commit tx'es HTLC outputs")
@ -1039,8 +1050,8 @@ class Peer(PrintError):
self.send_message(gen_msg("revoke_and_ack",
channel_id=channel_id,
per_commitment_secret=get_per_commitment_secret_from_seed(local_per_commitment_secret_seed, 2**48 - (chan.local_state.ctn//2) - 1),
next_per_commitment_point=local_next_per_commitment_point))
per_commitment_secret=last_secret,
next_per_commitment_point=next_point))
their_local_htlc_pubkey = derive_pubkey(chan.remote_config.htlc_basepoint.pubkey, chan.remote_state.next_per_commitment_point)
their_remote_htlc_pubkey = derive_pubkey(chan.local_config.htlc_basepoint.pubkey, chan.remote_state.next_per_commitment_point)
@ -1096,20 +1107,16 @@ class Peer(PrintError):
# TODO check commitment_signed results
local_last_per_commitment_secret = get_per_commitment_secret_from_seed(local_per_commitment_secret_seed, 2**48 - chan.local_state.ctn - 2)
local_next_per_commitment_secret = get_per_commitment_secret_from_seed(local_per_commitment_secret_seed, 2**48 - chan.local_state.ctn - 4)
local_next_per_commitment_point = secret_to_pubkey(int.from_bytes(local_next_per_commitment_secret, 'big'))
last_secret, next_point = derive_and_incr()
print("SENDING SECOND REVOKE AND ACK")
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))
per_commitment_secret=last_secret,
next_per_commitment_point=next_point))
return chan._replace(
local_state=chan.local_state._replace(
ctn=chan.local_state.ctn + 2,
amount_sat=chan.local_state.amount_sat + expected_received_sat
),
remote_state=chan.remote_state._replace(

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