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input+lnwallet: Add scripts for CSV delayed HTLC outputs

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We also increase the witness size for these types to account for the 3
extra bytes. The size won't be correct in all cases, but it is just an
upper bound in any case.
This commit is contained in:
Johan T. Halseth
2020-03-06 16:11:45 +01:00
parent b25f2fa94b
commit 8c0deb81c2
5 changed files with 48 additions and 17 deletions
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29
input/script_utils.go
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@@ -150,6 +150,9 @@ func Ripemd160H(d []byte) []byte {
// * The receiver of the HTLC sweeping all the funds in the case that a
// revoked commitment transaction bearing this HTLC was broadcast.
//
// If confirmedSpend=true, a 1 OP_CSV check will be added to the non-revocation
// cases, to allow sweeping only after confirmation.
//
// Possible Input Scripts:
// SENDR: <0> <sendr sig> <recvr sig> <0> (spend using HTLC timeout transaction)
// RECVR: <recvr sig> <preimage>
@@ -168,9 +171,11 @@ func Ripemd160H(d []byte) []byte {
// OP_HASH160 <ripemd160(payment hash)> OP_EQUALVERIFY
// OP_CHECKSIG
// OP_ENDIF
// [1 OP_CHECKSEQUENCEVERIFY OP_DROP] <- if allowing confirmed spend only.
// OP_ENDIF
func SenderHTLCScript(senderHtlcKey, receiverHtlcKey,
revocationKey *btcec.PublicKey, paymentHash []byte) ([]byte, error) {
revocationKey *btcec.PublicKey, paymentHash []byte,
confirmedSpend bool) ([]byte, error) {
builder := txscript.NewScriptBuilder()
@@ -243,6 +248,14 @@ func SenderHTLCScript(senderHtlcKey, receiverHtlcKey,
// Close out the OP_IF statement above.
builder.AddOp(txscript.OP_ENDIF)
// Add 1 block CSV delay if a confirmation is required for the
// non-revocation clauses.
if confirmedSpend {
builder.AddOp(txscript.OP_1)
builder.AddOp(txscript.OP_CHECKSEQUENCEVERIFY)
builder.AddOp(txscript.OP_DROP)
}
// Close out the OP_IF statement at the top of the script.
builder.AddOp(txscript.OP_ENDIF)
@@ -362,6 +375,9 @@ func SenderHtlcSpendTimeout(receiverSig []byte, signer Signer,
// * The sender of the HTLC sweeps the HTLC on-chain after the timeout period
// of the HTLC has passed.
//
// If confirmedSpend=true, a 1 OP_CSV check will be added to the non-revocation
// cases, to allow sweeping only after confirmation.
//
// Possible Input Scripts:
// RECVR: <0> <sender sig> <recvr sig> <preimage> (spend using HTLC success transaction)
// REVOK: <sig> <key>
@@ -381,10 +397,11 @@ func SenderHtlcSpendTimeout(receiverSig []byte, signer Signer,
// OP_DROP <cltv expiry> OP_CHECKLOCKTIMEVERIFY OP_DROP
// OP_CHECKSIG
// OP_ENDIF
// [1 OP_CHECKSEQUENCEVERIFY OP_DROP] <- if allowing confirmed spend only.
// OP_ENDIF
func ReceiverHTLCScript(cltvExpiry uint32, senderHtlcKey,
receiverHtlcKey, revocationKey *btcec.PublicKey,
paymentHash []byte) ([]byte, error) {
paymentHash []byte, confirmedSpend bool) ([]byte, error) {
builder := txscript.NewScriptBuilder()
@@ -467,6 +484,14 @@ func ReceiverHTLCScript(cltvExpiry uint32, senderHtlcKey,
// Close out the inner if statement.
builder.AddOp(txscript.OP_ENDIF)
// Add 1 block CSV delay for non-revocation clauses if confirmation is
// required.
if confirmedSpend {
builder.AddOp(txscript.OP_1)
builder.AddOp(txscript.OP_CHECKSEQUENCEVERIFY)
builder.AddOp(txscript.OP_DROP)
}
// Close out the outer if statement.
builder.AddOp(txscript.OP_ENDIF)