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lnwatcher: in inspect_tx_candidate, match witness scripts against HTLC templates

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fixes #7781
This commit is contained in:
ThomasV
2022-04-28 10:21:47 +02:00
parent cbeea6e42a
commit 44f29331bf
3 changed files with 109 additions and 13 deletions
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65
electrum/lnutil.py
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@@ -24,7 +24,8 @@ from . import segwit_addr
from .i18n import _
from .lnaddr import lndecode
from .bip32 import BIP32Node, BIP32_PRIME
from .transaction import BCDataStream
from .transaction import BCDataStream, OPPushDataGeneric
if TYPE_CHECKING:
from .lnchannel import Channel, AbstractChannel
@@ -636,6 +637,68 @@ def make_received_htlc(revocation_pubkey: bytes, remote_htlcpubkey: bytes,
]))
return script
WITNESS_TEMPLATE_OFFERED_HTLC = [
opcodes.OP_DUP,
opcodes.OP_HASH160,
OPPushDataGeneric(None),
opcodes.OP_EQUAL,
opcodes.OP_IF,
opcodes.OP_CHECKSIG,
opcodes.OP_ELSE,
OPPushDataGeneric(None),
opcodes.OP_SWAP,
opcodes.OP_SIZE,
OPPushDataGeneric(lambda x: x==1),
opcodes.OP_EQUAL,
opcodes.OP_NOTIF,
opcodes.OP_DROP,
opcodes.OP_2,
opcodes.OP_SWAP,
OPPushDataGeneric(None),
opcodes.OP_2,
opcodes.OP_CHECKMULTISIG,
opcodes.OP_ELSE,
opcodes.OP_HASH160,
OPPushDataGeneric(None),
opcodes.OP_EQUALVERIFY,
opcodes.OP_CHECKSIG,
opcodes.OP_ENDIF,
opcodes.OP_ENDIF,
]
WITNESS_TEMPLATE_RECEIVED_HTLC = [
opcodes.OP_DUP,
opcodes.OP_HASH160,
OPPushDataGeneric(None),
opcodes.OP_EQUAL,
opcodes.OP_IF,
opcodes.OP_CHECKSIG,
opcodes.OP_ELSE,
OPPushDataGeneric(None),
opcodes.OP_SWAP,
opcodes.OP_SIZE,
OPPushDataGeneric(lambda x: x==1),
opcodes.OP_EQUAL,
opcodes.OP_IF,
opcodes.OP_HASH160,
OPPushDataGeneric(None),
opcodes.OP_EQUALVERIFY,
opcodes.OP_2,
opcodes.OP_SWAP,
OPPushDataGeneric(None),
opcodes.OP_2,
opcodes.OP_CHECKMULTISIG,
opcodes.OP_ELSE,
opcodes.OP_DROP,
OPPushDataGeneric(None),
opcodes.OP_CHECKLOCKTIMEVERIFY,
opcodes.OP_DROP,
opcodes.OP_CHECKSIG,
opcodes.OP_ENDIF,
opcodes.OP_ENDIF,
]
def make_htlc_output_witness_script(is_received_htlc: bool, remote_revocation_pubkey: bytes, remote_htlc_pubkey: bytes,
local_htlc_pubkey: bytes, payment_hash: bytes, cltv_expiry: Optional[int]) -> bytes:
if is_received_htlc: