tlnbase: verify their htlc signature - electrum - Electrum Bitcoin wallet (HTM) git clone https://git.parazyd.org/electrum (DIR) Log (DIR) Files (DIR) Refs (DIR) Submodules --- (DIR) commit 309aca69b848a2fbdd14098213a13a53151413f0 (DIR) parent 6b79052bc9710f9c96634b76f918fb6a040e19c2 (HTM) 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