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lnchan: fix per_commitment_point number in verify_htlc

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Janus 2019-01-24 17:19:08 +01:00 • committed by ThomasV
parent 1f1207ecbe
commit 38d2d4c321
1 changed files with 6 additions and 3 deletions
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9
electrum/lnchan.py
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@ -354,15 +354,18 @@ class Channel(PrintError):
self.set_local_commitment(pending_local_commitment)
def verify_htlc(self, htlc: UpdateAddHtlc, htlc_sigs: Sequence[bytes], we_receive: bool, ctx) -> int:
_, this_point, _, _ = self.points()
ctn = extract_ctn_from_tx_and_chan(ctx, self)
secret = get_per_commitment_secret_from_seed(self.config[LOCAL].per_commitment_secret_seed, RevocationStore.START_INDEX - ctn)
point = secret_to_pubkey(int.from_bytes(secret, 'big'))
_script, htlc_tx = make_htlc_tx_with_open_channel(chan=self,
pcp=this_point,
pcp=point,
for_us=True,
we_receive=we_receive,
commit=ctx,
htlc=htlc)
pre_hash = sha256d(bfh(htlc_tx.serialize_preimage(0)))
remote_htlc_pubkey = derive_pubkey(self.config[REMOTE].htlc_basepoint.pubkey, this_point)
remote_htlc_pubkey = derive_pubkey(self.config[REMOTE].htlc_basepoint.pubkey, point)
for idx, sig in enumerate(htlc_sigs):
if ecc.verify_signature(remote_htlc_pubkey, sig, pre_hash):
return idx