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swap: add HTLC script version

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This commit is contained in:
Andras Banki-Horvath 2020-07-20 16:28:08 +02:00
parent e9f71e90c2
commit 9fdd531130
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GPG key ID: 80E5375C094198D8
5 changed files with 48 additions and 20 deletions
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41
swap/htlc.go
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@ -4,6 +4,7 @@ import (
"bytes"
"crypto/sha256"
"errors"
"fmt"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/txscript"
@ -25,8 +26,17 @@ const (
HtlcNP2WSH
)
// ScriptVersion defines the HTLC script version.
type ScriptVersion uint8
const (
// HtlcV1 refers to the original version of the HTLC script.
HtlcV1 ScriptVersion = iota
)
// Htlc contains relevant htlc information from the receiver perspective.
type Htlc struct {
Version ScriptVersion
Script []byte
PkScript []byte
Hash lntypes.Hash
@ -45,6 +55,7 @@ var (
// the maximum value for cltv expiry to get the maximum (worst case)
// script size.
QuoteHtlc, _ = NewHtlc(
HtlcV1,
^int32(0), quoteKey, quoteKey, quoteHash, HtlcP2WSH,
&chaincfg.MainNetParams,
)
@ -65,13 +76,26 @@ func (h HtlcOutputType) String() string {
}
// NewHtlc returns a new instance.
func NewHtlc(cltvExpiry int32, senderKey, receiverKey [33]byte,
func NewHtlc(version ScriptVersion, cltvExpiry int32,
senderKey, receiverKey [33]byte,
hash lntypes.Hash, outputType HtlcOutputType,
chainParams *chaincfg.Params) (*Htlc, error) {
script, err := swapHTLCScript(
cltvExpiry, senderKey, receiverKey, hash,
var (
err error
script []byte
)
switch version {
case HtlcV1:
script, err = swapHTLCScriptV1(
cltvExpiry, senderKey, receiverKey, hash,
)
default:
return nil, fmt.Errorf("unknown script version: %v", version)
}
if err != nil {
return nil, err
}
@ -135,6 +159,7 @@ func NewHtlc(cltvExpiry int32, senderKey, receiverKey [33]byte,
return &Htlc{
Hash: hash,
Version: version,
Script: script,
PkScript: pkScript,
OutputType: outputType,
@ -144,19 +169,19 @@ func NewHtlc(cltvExpiry int32, senderKey, receiverKey [33]byte,
}, nil
}
// SwapHTLCScript returns the on-chain HTLC witness script.
// SwapHTLCScriptV1 returns the on-chain HTLC witness script.
//
// OP_SIZE 32 OP_EQUAL
// OP_IF
// OP_HASH160 <ripemd160(swap_hash)> OP_EQUALVERIFY
// <recvr key>
// OP_HASH160 <ripemd160(swapHash)> OP_EQUALVERIFY
// <receiverHtlcKey>
// OP_ELSE
// OP_DROP
// <cltv timeout> OP_CHECKLOCKTIMEVERIFY OP_DROP
// <sender key>
// <senderHtlcKey>
// OP_ENDIF
// OP_CHECKSIG
func swapHTLCScript(cltvExpiry int32, senderHtlcKey,
func swapHTLCScriptV1(cltvExpiry int32, senderHtlcKey,
receiverHtlcKey [33]byte, swapHash lntypes.Hash) ([]byte, error) {
builder := txscript.NewScriptBuilder()