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lnbase: offered htlc script construction

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This commit is contained in:
Janus
2018-04-16 17:29:03 +02:00
committed by ThomasV
parent 1bc6958c83
commit a23aac76d3
2 changed files with 60 additions and 9 deletions
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29
lib/lnbase.py
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@@ -21,6 +21,7 @@ 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,
@@ -260,10 +261,34 @@ def get_obscured_ctn(ctn, local, remote):
def overall_weight(num_htlc):
return 500 + 172 * num_htlc + 224
def make_offered_htlc(revocation_pubkey, remote_htlcpubkey, local_htlcpubkey, payment_preimage):
assert type(revocation_pubkey) is bytes
assert type(remote_htlcpubkey) is bytes
assert type(local_htlcpubkey) is bytes
assert type(payment_preimage) is bytes
h = hashlib.new("ripemd160")
h.update(payment_preimage)
payment_hash = h.digest()#ripemd.new(payment_preimage).digest()
assert type(payment_hash) is bytes
return bytes([opcodes.OP_DUP, opcodes.OP_HASH160]) + bfh(push_script(bh2u(bitcoin.hash_160(revocation_pubkey)))) + bytes([opcodes.OP_EQUAL
, opcodes.OP_IF
, opcodes.OP_CHECKSIG
, opcodes.OP_ELSE]) +\
bfh(push_script(bh2u(remote_htlcpubkey))) + bytes([opcodes.OP_SWAP, opcodes.OP_SIZE]) + bitcoin.add_number_to_script(32) + bytes([opcodes.OP_EQUAL,
opcodes.OP_NOTIF,
# to local node via htlc-timeout transaction (timelocked)
opcodes.OP_DROP]) + bitcoin.add_number_to_script(2) + bytes([opcodes.OP_SWAP]) + bfh(push_script(bh2u(local_htlcpubkey))) + bitcoin.add_number_to_script(2) + bytes([opcodes.OP_CHECKMULTISIG,
opcodes.OP_ELSE,
# to remote node with preimage
opcodes.OP_HASH160]) + bfh(push_script(bh2u(payment_hash))) + bytes([opcodes.OP_EQUALVERIFY,
opcodes.OP_CHECKSIG,
opcodes.OP_ENDIF,
opcodes.OP_ENDIF])
def make_commitment(ctn, local_funding_pubkey, remote_funding_pubkey, remotepubkey,
payment_pubkey, remote_payment_pubkey, revocation_pubkey, delayed_pubkey,
funding_txid, funding_pos, funding_satoshis,
to_local_msat, to_remote_msat, local_feerate, local_delay):
to_local_msat, to_remote_msat, local_feerate, local_delay, htlcs=[]):
pubkeys = sorted([bh2u(local_funding_pubkey), bh2u(remote_funding_pubkey)])
obs = get_obscured_ctn(ctn, payment_pubkey, remote_payment_pubkey)
locktime = (0x20 << 24) + (obs & 0xffffff)
@@ -292,7 +317,7 @@ def make_commitment(ctn, local_funding_pubkey, remote_funding_pubkey, remotepubk
to_local = (bitcoin.TYPE_ADDRESS, local_address, local_amount)
to_remote = (bitcoin.TYPE_ADDRESS, remote_address, remote_amount)
# no htlc for the moment
c_outputs = [to_local, to_remote]
c_outputs = [to_local, to_remote] + htlcs
# create commitment tx
tx = Transaction.from_io(c_inputs, c_outputs, locktime=locktime, version=2)
tx.BIP_LI01_sort()