tlnbase: verify their htlc signature - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
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DIR Files
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DIR Submodules
---
DIR commit 309aca69b848a2fbdd14098213a13a53151413f0
DIR parent 6b79052bc9710f9c96634b76f918fb6a040e19c2
HTML Author: Janus <ysangkok@gmail.com>
Date: Wed, 2 May 2018 17:01:35 +0200
lnbase: verify their htlc signature
Diffstat:
M lib/lnbase.py | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
---
DIR diff --git a/lib/lnbase.py b/lib/lnbase.py
t@@ -948,7 +948,31 @@ class Peer(PrintError):
if htlc_sigs_len != 64:
raise Exception("unexpected number of htlc signatures: " + str(htlc_sigs_len))
- # TODO verify htlc_signature
+ local_last_per_commitment_secret = get_per_commitment_secret_from_seed(local_per_commitment_secret_seed, 2**48-2)
+ local_last_per_commitment_point = secret_to_pubkey(int.from_bytes(
+ local_last_per_commitment_secret,
+ byteorder="big"))
+ revocation_pubkey = derive_blinded_pubkey(chan.remote_config.revocation_basepoint.pubkey, local_last_per_commitment_point)
+ remote_delayedpubkey = derive_pubkey(chan.local_config.delayed_basepoint.pubkey, local_last_per_commitment_point)
+ htlc_tx_output = make_htlc_tx_output(
+ amount_msat = amount_msat,
+ local_feerate = chan.constraints.feerate,
+ revocationpubkey=revocation_pubkey,
+ local_delayedpubkey=remote_delayedpubkey,
+ success = True, # HTLC-success for the HTLC spending from a received HTLC output
+ to_self_delay = chan.remote_config.to_self_delay)
+ preimage_script = htlcs_in_local[0][0]
+ htlc_tx_inputs = make_htlc_tx_inputs(
+ new_commitment.txid(), new_commitment.htlc_output_indices[0],
+ revocationpubkey=revocation_pubkey,
+ local_delayedpubkey=remote_delayedpubkey,
+ amount_msat=amount_msat,
+ witness_script=bh2u(preimage_script))
+ htlc_tx = make_htlc_tx(0, inputs=htlc_tx_inputs, output=htlc_tx_output)
+ print("htlc tx preimage", htlc_tx.serialize_preimage(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)
+ assert bitcoin.verify_signature(remote_htlc_pubkey, commitment_signed_msg["htlc_signature"], pre_hash)
local_last_pcs_index = 2**48 - chan.local_state.ctn - 1
local_last_per_commitment_secret = get_per_commitment_secret_from_seed(local_per_commitment_secret_seed, local_last_pcs_index)
t@@ -985,7 +1009,6 @@ class Peer(PrintError):
success = False, # timeout for the one offering an HTLC
to_self_delay = chan.local_config.to_self_delay)
preimage_script = htlcs_in_remote[0][0]
- htlc_output_txid = remote_ctx.txid()
htlc_tx_inputs = make_htlc_tx_inputs(
remote_ctx.txid(), remote_ctx.htlc_output_indices[0],
revocationpubkey=revocation_pubkey,
t@@ -1068,7 +1091,7 @@ class Peer(PrintError):
class LNWorker:
def __init__(self, wallet, network):
- self.privkey = bitcoin.sha256('1234567890')
+ self.privkey = H256(str(time.time()).encode("ascii"))
self.wallet = wallet
self.network = network
self.config = network.config