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lnbase: verify their htlc signature

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Janus 2018-05-02 17:01:35 +02:00 • committed by SomberNight
parent f2bc4e96aa
commit 7c7c633175
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1 changed files with 26 additions and 3 deletions
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29
lib/lnbase.py
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@ -948,7 +948,31 @@ class Peer(PrintError):
if htlc_sigs_len != 64: if htlc_sigs_len != 64:
raise Exception("unexpected number of htlc signatures: " + str(htlc_sigs_len)) 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_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) local_last_per_commitment_secret = get_per_commitment_secret_from_seed(local_per_commitment_secret_seed, local_last_pcs_index)
@ -985,7 +1009,6 @@ class Peer(PrintError):
success = False, # timeout for the one offering an HTLC success = False, # timeout for the one offering an HTLC
to_self_delay = chan.local_config.to_self_delay) to_self_delay = chan.local_config.to_self_delay)
preimage_script = htlcs_in_remote[0][0] preimage_script = htlcs_in_remote[0][0]
htlc_output_txid = remote_ctx.txid()
htlc_tx_inputs = make_htlc_tx_inputs( htlc_tx_inputs = make_htlc_tx_inputs(
remote_ctx.txid(), remote_ctx.htlc_output_indices[0], remote_ctx.txid(), remote_ctx.htlc_output_indices[0],
revocationpubkey=revocation_pubkey, revocationpubkey=revocation_pubkey,
@ -1068,7 +1091,7 @@ class Peer(PrintError):
class LNWorker: class LNWorker:
def __init__(self, wallet, network): def __init__(self, wallet, network):
self.privkey = bitcoin.sha256('1234567890') self.privkey = H256(str(time.time()).encode("ascii"))
self.wallet = wallet self.wallet = wallet
self.network = network self.network = network
self.config = network.config self.config = network.config