/
wpkh.go
202 lines (166 loc) · 4.27 KB
/
wpkh.go
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package descriptor
import (
"encoding/hex"
"errors"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/btcutil/hdkeychain"
"github.com/btcsuite/btcd/txscript"
)
const (
// numOfScripts to be generated in case wpkh wallet is "range"
numOfScripts = 100
)
type WpkhWallet struct {
keyInfo *keyInfo
}
func newWpkhWalletFromKeyInfo(info *keyInfo) WpkhWallet {
return WpkhWallet{
keyInfo: info,
}
}
func (w WpkhWallet) Type() string {
return "wpkh"
}
func (w WpkhWallet) IsRange() bool {
if w.keyInfo.extendedKeyInfo != nil {
return w.keyInfo.extendedKeyInfo.isRange
}
return false
}
func (w WpkhWallet) Script(opts *ScriptOpts) ([]ScriptResponse, error) {
response := make([]ScriptResponse, 0)
var (
numOfScriptsToBeGenerated = 1
index uint32 = 0
generateMoreScripts = false
)
if w.IsRange() {
numOfScriptsToBeGenerated = numOfScripts
if opts != nil {
if opts.numOfScripts != nil {
generateMoreScripts = true
numOfScriptsToBeGenerated = *opts.numOfScripts
} else {
index = *opts.index
}
}
}
if w.keyInfo.pubKey != nil {
pubKeyBytes, err := hex.DecodeString(*w.keyInfo.pubKey)
if err != nil {
return nil, err
}
script, err := wpkhScriptFromBytes(pubKeyBytes)
if err != nil {
return nil, err
}
response = append(response, ScriptResponse{
Script: script,
})
return response, nil
}
if w.keyInfo.wif != nil {
wif, err := btcutil.DecodeWIF(*w.keyInfo.wif)
if err != nil {
return nil, err
}
script, err := wpkhScriptFromBytes(wif.PrivKey.PubKey().SerializeCompressed())
if err != nil {
return nil, err
}
response = append(response, ScriptResponse{
Script: script,
})
return response, nil
}
if w.keyInfo.extendedKeyInfo != nil {
masterExtKey, err := hdkeychain.NewKeyFromString(w.keyInfo.extendedKeyInfo.key)
if err != nil {
return nil, err
}
for _, v := range w.keyInfo.extendedKeyInfo.path {
masterExtKey, err = masterExtKey.Derive(v)
if err != nil {
return nil, err
}
}
if w.keyInfo.extendedKeyInfo.isRange {
if generateMoreScripts {
for i := 0; i < numOfScriptsToBeGenerated; i++ {
childKey, err := masterExtKey.Derive(uint32(i))
if err != nil {
return nil, err
}
pubKey, err := childKey.ECPubKey()
if err != nil {
return nil, err
}
script, err := wpkhScriptFromBytes(pubKey.SerializeCompressed())
if err != nil {
return nil, err
}
response = append(response, ScriptResponse{
DerivationPath: w.derivationPath(uint32(i)),
Script: script,
})
}
} else {
childKey, err := masterExtKey.Derive(index)
if err != nil {
return nil, err
}
pubKey, err := childKey.ECPubKey()
if err != nil {
return nil, err
}
script, err := wpkhScriptFromBytes(pubKey.SerializeCompressed())
if err != nil {
return nil, err
}
response = append(response, ScriptResponse{
DerivationPath: w.derivationPath(index),
Script: script,
})
}
} else {
pubKey, err := masterExtKey.ECPubKey()
if err != nil {
return nil, err
}
script, err := wpkhScriptFromBytes(pubKey.SerializeCompressed())
if err != nil {
return nil, err
}
response = append(response, ScriptResponse{
DerivationPath: w.derivationPath(index),
Script: script,
})
}
return response, nil
}
return nil, errors.New("parser didnt recognised puKey, wif not extended keys in expression")
}
func (w WpkhWallet) derivationPath(index uint32) []uint32 {
derivationPath := make([]uint32, 0)
if w.keyInfo.keyOrigin != nil {
derivationPath = append(derivationPath, w.keyInfo.keyOrigin.masterKeyFingerprint)
derivationPath = append(derivationPath, w.keyInfo.keyOrigin.path...)
}
if w.keyInfo.extendedKeyInfo != nil {
if len(w.keyInfo.extendedKeyInfo.path) > 0 {
derivationPath = append(derivationPath, w.keyInfo.extendedKeyInfo.path...)
}
}
derivationPath = append(derivationPath, index)
return derivationPath
}
func wpkhScriptFromBytes(pubKeyBytes []byte) ([]byte, error) {
pkHash := hash160(pubKeyBytes)
builder := txscript.NewScriptBuilder()
builder.AddOp(txscript.OP_0).AddData(pkHash)
script, err := builder.Script()
if err != nil {
return nil, err
}
return script, nil
}