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lnwallet: update sender/receiver HTLC scripts to use distinct HTLC keys 

In this commit, we modify the naming and comments of the routines that
create the sender/receiver HTLC scripts to denote that a set of
distinct keys are used. The scripts materially haven’t changed, but the
set of keys expected has.
This commit is contained in:
Olaoluwa Osuntokun 2017-11-14 20:36:00 -08:00
parent 4700c1be04
commit a812974808
No known key found for this signature in database
GPG Key ID: 964EA263DD637C21
1 changed files with 15 additions and 14 deletions
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29
lnwallet/script_utils.go
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@ -185,17 +185,17 @@ func ripemd160H(d []byte) []byte {
// OP_IF
// OP_CHECKSIG
// OP_ELSE
// <recv key>
// <recv htlc key>
// OP_SWAP OP_SIZE 32 OP_EQUAL
// OP_NOTIF
// OP_DROP 2 OP_SWAP <sender key> 2 OP_CHECKMULTISIG
// OP_DROP 2 OP_SWAP <sender htlc key> 2 OP_CHECKMULTISIG
// OP_ELSE
// OP_HASH160 <ripemd160(payment hash)> OP_EQUALVERIFY
// OP_CHECKSIG
// OP_ENDIF
// OP_ENDIF
func senderHTLCScript(senderKey, receiverKey, revocationKey *btcec.PublicKey,
paymentHash []byte) ([]byte, error) {
func senderHTLCScript(senderHtlcKey, receiverHtlcKey,
revocationKey *btcec.PublicKey, paymentHash []byte) ([]byte, error) {
builder := txscript.NewScriptBuilder()
@ -222,7 +222,7 @@ func senderHTLCScript(senderKey, receiverKey, revocationKey *btcec.PublicKey,
// the stack. This will be needed later if we decide that this is the
// sender activating the time out clause with the HTLC timeout
// transaction.
builder.AddData(receiverKey.SerializeCompressed())
builder.AddData(receiverHtlcKey.SerializeCompressed())
// Atm, the top item of the stack is the receiverKey's so we use a swap
// to expose what is either the payment pre-image or a signature.
@ -245,7 +245,7 @@ func senderHTLCScript(senderKey, receiverKey, revocationKey *btcec.PublicKey,
builder.AddOp(txscript.OP_DROP)
builder.AddOp(txscript.OP_2)
builder.AddOp(txscript.OP_SWAP)
builder.AddData(senderKey.SerializeCompressed())
builder.AddData(senderHtlcKey.SerializeCompressed())
builder.AddOp(txscript.OP_2)
builder.AddOp(txscript.OP_CHECKMULTISIG)
@ -381,7 +381,7 @@ func senderHtlcSpendTimeout(receiverSig []byte, signer Signer,
// of the HTLC has passed.
//
// Possible Input Scripts:
// RECVR: <0> <sender sig> <recvr sig> <preimage>
// RECVR: <0> <sender sig> <recvr sig> <preimage> (spend using HTLC success transaction)
// REVOK: <sig> <key>
// SENDR: <sig> 0
//
@ -390,18 +390,19 @@ func senderHtlcSpendTimeout(receiverSig []byte, signer Signer,
// OP_IF
// OP_CHECKSIG
// OP_ELSE
// <sendr key>
// <sendr htlc key>
// OP_SWAP OP_SIZE 32 OP_EQUAL
// OP_IF
// OP_HASH160 <ripemd160(payment hash)> OP_EQUALVERIFY
// 2 OP_SWAP <recvr key> 2 OP_CHECKMULTISIG
// 2 OP_SWAP <recvr htlc key> 2 OP_CHECKMULTISIG
// OP_ELSE
// OP_DROP <cltv expiry> OP_CHECKLOCKTIMEVERIFY OP_DROP
// OP_CHECKSIG
// OP_ENDIF
// OP_ENDIF
func receiverHTLCScript(cltvExipiry uint32, senderKey,
receiverKey, revocationKey *btcec.PublicKey, paymentHash []byte) ([]byte, error) {
func receiverHTLCScript(cltvExipiry uint32, senderHtlcKey,
receiverHtlcKey, revocationKey *btcec.PublicKey,
paymentHash []byte) ([]byte, error) {
builder := txscript.NewScriptBuilder()
@ -429,7 +430,7 @@ func receiverHTLCScript(cltvExipiry uint32, senderKey,
// the stack. This will be needed later if we decide that this is the
// receiver transitioning the output to the claim state using their
// second-level HTLC success transaction.
builder.AddData(senderKey.SerializeCompressed())
builder.AddData(senderHtlcKey.SerializeCompressed())
// Atm, the top item of the stack is the sender's key so we use a swap
// to expose what is either the payment pre-image or something else.
@ -460,7 +461,7 @@ func receiverHTLCScript(cltvExipiry uint32, senderKey,
// this output, but only by the HTLC success transaction.
builder.AddOp(txscript.OP_2)
builder.AddOp(txscript.OP_SWAP)
builder.AddData(receiverKey.SerializeCompressed())
builder.AddData(receiverHtlcKey.SerializeCompressed())
builder.AddOp(txscript.OP_2)
builder.AddOp(txscript.OP_CHECKMULTISIG)
@ -475,7 +476,7 @@ func receiverHTLCScript(cltvExipiry uint32, senderKey,
// With that item dropped off, we can now enforce the absolute
// lock-time required to timeout the HTLC. If the time has passed, then
// we'll proceed with a checksig to ensure that this is actually the
// sender of he original HLTC.
// sender of he original HTLC.
builder.AddInt64(int64(cltvExipiry))
builder.AddOp(txscript.OP_CHECKLOCKTIMEVERIFY)
builder.AddOp(txscript.OP_DROP)