tlnchan: fix per_commitment_point number in verify_htlc - electrum - Electrum Bitcoin wallet
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---
DIR commit 38d2d4c32165ee9014bd32e7e26f34b6bf05f7e5
DIR parent 1f1207ecbe1c075028527e2adf73ecac8799480a
HTML Author: Janus <ysangkok@gmail.com>
Date: Thu, 24 Jan 2019 17:19:08 +0100
lnchan: fix per_commitment_point number in verify_htlc
Diffstat:
M electrum/lnchan.py | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
---
DIR diff --git a/electrum/lnchan.py b/electrum/lnchan.py
t@@ -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