tlnbase: make_htlc_tx - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
DIR Log
DIR Files
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DIR Submodules
---
DIR commit d7244f67088ad9516c948db0e3fdf31ea1ef03bb
DIR parent ab7a854f9a716192a52b179004ae9d625b9e1bd8
HTML Author: Janus <ysangkok@gmail.com>
Date: Tue, 17 Apr 2018 12:35:22 +0200
lnbase: make_htlc_tx
Diffstat:
M lib/lnbase.py | 43 ++++++++++++++++++++++++++++++-
M lib/tests/test_lnbase.py | 18 ++++++++++++++----
2 files changed, 56 insertions(+), 5 deletions(-)
---
DIR diff --git a/lib/lnbase.py b/lib/lnbase.py
t@@ -21,7 +21,6 @@ import binascii
import hashlib
import hmac
import cryptography.hazmat.primitives.ciphers.aead as AEAD
-from . import ripemd
from .bitcoin import (public_key_from_private_key, ser_to_point, point_to_ser,
string_to_number, deserialize_privkey, EC_KEY, rev_hex, int_to_hex,
t@@ -277,6 +276,48 @@ def derive_blinded_pubkey(basepoint, per_commitment_point):
def overall_weight(num_htlc):
return 500 + 172 * num_htlc + 224
+HTLC_TIMEOUT_WEIGHT = 663
+HTLC_SUCCESS_WEIGHT = 703
+
+def make_htlc_tx(cltv_timeout, htlc_output_txid, htlc_output_index, remotehtlcsig, localhtlcsig, payment_preimage, amount_msat, local_feerate, revocationpubkey, local_delayedpubkey):
+ assert type(cltv_timeout) is int
+ assert type(htlc_output_txid) is str
+ assert type(htlc_output_index) is int
+ assert type(remotehtlcsig) is bytes
+ assert type(localhtlcsig) is bytes
+ assert type(payment_preimage) is bytes
+ assert type(amount_msat) is int
+ assert type(local_feerate) is int
+ assert type(revocationpubkey) is bytes
+ assert type(local_delayedpubkey) is bytes
+ c_inputs = [{
+ 'type': 'p2wsh',
+ 'x_pubkeys': [bh2u(x) for x in [revocationpubkey, local_delayedpubkey]],
+ 'signatures': [bh2u(x) for x in [remotehtlcsig, localhtlcsig, payment_preimage]],
+ 'num_sig': 2,
+ 'prevout_n': htlc_output_index,
+ 'prevout_hash': htlc_output_txid,
+ 'value': amount_msat // 1000,
+ 'coinbase': False,
+ 'sequence': 0x0
+ }]
+ script = bytes([opcodes.OP_IF]) \
+ + bfh(push_script(bh2u(revocationpubkey))) \
+ + bytes([opcodes.OP_ELSE]) \
+ + bitcoin.add_number_to_script(0) \
+ + bytes([opcodes.OP_CSV, opcodes.OP_DROP]) \
+ + bfh(push_script(bh2u(local_delayedpubkey))) \
+ + bytes([opcodes.OP_ENDIF, opcodes.OP_CHECKSIG])
+
+ p2wsh = bitcoin.redeem_script_to_address('p2wsh', bh2u(script))
+ weight = HTLC_SUCCESS_WEIGHT if cltv_timeout == 0 else HTLC_TIMEOUT_WEIGHT
+ fee = local_feerate * weight
+ output = (bitcoin.TYPE_ADDRESS, p2wsh, amount_msat // 1000 - fee)
+ c_outputs = [output]
+ tx = Transaction.from_io(c_inputs, c_outputs, locktime=cltv_timeout, version=2)
+ tx.BIP_LI01_sort()
+ return tx
+
def make_offered_htlc(revocation_pubkey, remote_htlcpubkey, local_htlcpubkey, payment_preimage):
assert type(revocation_pubkey) is bytes
assert type(remote_htlcpubkey) is bytes
DIR diff --git a/lib/tests/test_lnbase.py b/lib/tests/test_lnbase.py
t@@ -3,7 +3,7 @@ import json
import unittest
from lib.util import bh2u, bfh
-from lib.lnbase import make_commitment, get_obscured_ctn, Peer, make_offered_htlc, make_received_htlc
+from lib.lnbase import make_commitment, get_obscured_ctn, Peer, make_offered_htlc, make_received_htlc, make_htlc_tx
from lib.lnbase import secret_to_pubkey, derive_pubkey, derive_privkey, derive_blinded_pubkey
from lib.transaction import Transaction
from lib import bitcoin
t@@ -116,7 +116,12 @@ class Test_LNBase(unittest.TestCase):
# local_signature = 30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06
parazyd.org:70 /git/electrum/commit/d7244f67088ad9516c948db0e3fdf31ea1ef03bb.gph:91: line too long