/
signtx.go
288 lines (255 loc) · 8.36 KB
/
signtx.go
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package btc
import (
"bytes"
"crypto/ecdsa"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"github.com/anyswap/CrossChain-Router/v3/common"
"github.com/anyswap/CrossChain-Router/v3/log"
"github.com/anyswap/CrossChain-Router/v3/mpc"
"github.com/anyswap/CrossChain-Router/v3/params"
"github.com/anyswap/CrossChain-Router/v3/router"
"github.com/anyswap/CrossChain-Router/v3/tokens"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcwallet/wallet/txauthor"
)
// MPCSignTransaction mpc sign raw tx
func (b *Bridge) MPCSignTransaction(rawTx interface{}, args *tokens.BuildTxArgs) (signedTx interface{}, txHash string, err error) {
tx, ok := rawTx.(*txauthor.AuthoredTx)
if !ok {
return nil, "", tokens.ErrWrongRawTx
}
err = b.verifyTransactionWithArgs(tx, args)
if err != nil {
log.Warn("Verify transaction failed", "error", err)
return nil, "", err
}
mpcParams := params.GetMPCConfig(b.UseFastMPC)
if mpcParams.SignWithPrivateKey {
priKey := mpcParams.GetSignerPrivateKey(b.ChainConfig.ChainID)
return b.SignTransactionWithPrivateKey(rawTx, priKey)
}
return b.DcrmSignTransaction(rawTx, args)
}
func (b *Bridge) verifyTransactionWithArgs(tx *txauthor.AuthoredTx, args *tokens.BuildTxArgs) error {
checkReceiver := args.Bind
payToReceiverScript, err := b.GetPayToAddrScript(checkReceiver)
if err != nil {
return err
}
isRightReceiver := false
for _, out := range tx.Tx.TxOut {
if bytes.Equal(out.PkScript, payToReceiverScript) {
isRightReceiver = true
break
}
}
if !isRightReceiver {
return fmt.Errorf("[sign] verify tx receiver failed")
}
return nil
}
// DcrmSignTransaction dcrm sign raw tx
func (b *Bridge) DcrmSignTransaction(rawTx interface{}, args *tokens.BuildTxArgs) (signedTx interface{}, txHash string, err error) {
authoredTx, ok := rawTx.(*txauthor.AuthoredTx)
if !ok {
return nil, "", tokens.ErrWrongRawTx
}
err = b.verifyTransactionWithArgs(authoredTx, args)
if err != nil {
return nil, "", err
}
pubkeyStr := router.GetMPCPublicKey(args.From)
cPkData, err := b.GetCompressedPublicKey(pubkeyStr, false)
if err != nil {
return nil, "", err
}
var (
msgHashes []string
rsvs []string
sigScripts [][]byte
hasP2shInput bool
sigHash []byte
)
for i, preScript := range authoredTx.PrevScripts {
sigScript := preScript
if b.IsPayToScriptHash(preScript) {
sigScript, err = b.getRedeemScriptByOutputScrpit(preScript)
if err != nil {
return nil, "", err
}
hasP2shInput = true
}
sigHash, err = b.CalcSignatureHash(sigScript, authoredTx.Tx, i)
if err != nil {
return nil, "", err
}
msgHash := hex.EncodeToString(sigHash)
msgHashes = append(msgHashes, msgHash)
sigScripts = append(sigScripts, sigScript)
}
if !hasP2shInput {
sigScripts = nil
}
rsvs, err = b.DcrmSignMsgHash(msgHashes, args)
if err != nil {
return nil, "", err
}
return b.MakeSignedTransaction(authoredTx, msgHashes, rsvs, sigScripts, cPkData)
}
// SignTransactionWithPrivateKey sign tx with ECDSA private key string
func (b *Bridge) SignTransactionWithPrivateKey(rawTx interface{}, wifPrivKey string) (signedTx interface{}, txHash string, err error) {
pkWif, err := DecodeWIF(wifPrivKey)
if err != nil {
return nil, "", err
}
return b.signTransaction(rawTx, pkWif.PrivKey.ToECDSA())
}
func (b *Bridge) signTransaction(tx interface{}, privKey *ecdsa.PrivateKey) (signedTx interface{}, txHash string, err error) {
authoredTx, ok := tx.(*txauthor.AuthoredTx)
if !ok {
return nil, "", tokens.ErrWrongRawTx
}
var (
msgHashes []string
rsvs []string
sigScripts [][]byte
hasP2shInput bool
)
for i, preScript := range authoredTx.PrevScripts {
sigScript := preScript
if b.IsPayToScriptHash(preScript) {
sigScript, err = b.getRedeemScriptByOutputScrpit(preScript)
if err != nil {
return nil, "", err
}
hasP2shInput = true
}
sigHash, err := b.CalcSignatureHash(sigScript, authoredTx.Tx, i)
if err != nil {
return nil, "", err
}
msgHash := hex.EncodeToString(sigHash)
msgHashes = append(msgHashes, msgHash)
sigScripts = append(sigScripts, sigScript)
}
if !hasP2shInput {
sigScripts = nil
}
for _, msgHash := range msgHashes {
rsv, errf := b.SignWithECDSA(privKey, common.FromHex(msgHash))
if errf != nil {
return nil, "", errf
}
rsvs = append(rsvs, rsv)
}
cPkData := b.GetPublicKeyFromECDSA(privKey, true)
return b.MakeSignedTransaction(authoredTx, msgHashes, rsvs, sigScripts, cPkData)
}
// SignWithECDSA sign with ecdsa private key
func (b *Bridge) SignWithECDSA(privKey *ecdsa.PrivateKey, msgHash []byte) (rsv string, err error) {
signature, err := (*btcec.PrivateKey)(privKey).Sign(msgHash)
if err != nil {
return "", err
}
rr := fmt.Sprintf("%064X", signature.R)
ss := fmt.Sprintf("%064X", signature.S)
rsv = fmt.Sprintf("%s%s00", rr, ss)
return rsv, nil
}
// GetPublicKeyFromECDSA get public key from ecdsa private key
func (b *Bridge) GetPublicKeyFromECDSA(privKey *ecdsa.PrivateKey, compressed bool) []byte {
if compressed {
return (*btcec.PublicKey)(&privKey.PublicKey).SerializeCompressed()
}
return (*btcec.PublicKey)(&privKey.PublicKey).SerializeUncompressed()
}
// MakeSignedTransaction make signed tx
func (b *Bridge) MakeSignedTransaction(authoredTx *txauthor.AuthoredTx, msgHash, rsv []string, sigScripts [][]byte, cPkData []byte) (signedTx interface{}, txHash string, err error) {
if len(cPkData) == 0 {
return nil, "", errors.New("empty public key data")
}
err = checkEqualLength(authoredTx, msgHash, rsv, sigScripts)
if err != nil {
return nil, "", err
}
log.Info(b.ChainConfig.BlockChain+" Bridge MakeSignedTransaction", "msghash", msgHash, "count", len(msgHash))
for i, txin := range authoredTx.Tx.TxIn {
signData, ok := b.getSigDataFromRSV(rsv[i])
if !ok {
return nil, "", errors.New("wrong RSV data")
}
sigScript, err := b.GetSigScript(sigScripts, authoredTx.PrevScripts[i], signData, cPkData, i)
if err != nil {
return nil, "", err
}
txin.SignatureScript = sigScript
}
txHash = authoredTx.Tx.TxHash().String()
log.Info(b.ChainConfig.BlockChain+" MakeSignedTransaction success", "txhash", txHash)
return authoredTx, txHash, nil
}
func checkEqualLength(authoredTx *txauthor.AuthoredTx, msgHash, rsv []string, sigScripts [][]byte) error {
txIn := authoredTx.Tx.TxIn
if len(txIn) != len(msgHash) {
return errors.New("mismatch number of msghashes and tx inputs")
}
if len(txIn) != len(rsv) {
return errors.New("mismatch number of signatures and tx inputs")
}
if sigScripts != nil && len(sigScripts) != len(txIn) {
return errors.New("mismatch number of signatures scripts and tx inputs")
}
return nil
}
// DcrmSignMsgHash dcrm sign msg hash
func (b *Bridge) DcrmSignMsgHash(msgHash []string, args *tokens.BuildTxArgs) (rsv []string, err error) {
jsondata, _ := json.Marshal(args.GetExtraArgs())
msgContext := []string{string(jsondata)}
pubkeyStr := router.GetMPCPublicKey(args.From)
mpcConfig := mpc.GetMPCConfig(b.UseFastMPC)
log.Info(b.ChainConfig.BlockChain+" DcrmSignTransaction start", "msgContext", msgContext, "txid", args.SwapID)
keyID, rsv, err := mpcConfig.DoSign("EC256K1", pubkeyStr, msgHash, msgContext)
if err != nil {
return nil, err
}
log.Info(b.ChainConfig.BlockChain+" DcrmSignTransaction finished", "keyID", keyID, "msghash", msgHash, "txid", args.SwapID)
if len(rsv) != len(msgHash) {
return nil, fmt.Errorf("get sign status require %v rsv but have %v (keyID = %v)", len(msgHash), len(rsv), keyID)
}
rsv, err = b.adjustRsvOrders(rsv, msgHash, pubkeyStr)
if err != nil {
return nil, err
}
log.Trace(b.ChainConfig.BlockChain+" DcrmSignTransaction get rsv success", "keyID", keyID, "txid", args.SwapID, "rsv", rsv)
return rsv, nil
}
func (b *Bridge) adjustRsvOrders(rsvs, msgHashes []string, fromPublicKey string) (newRsvs []string, err error) {
if len(rsvs) <= 1 {
return rsvs, nil
}
fromPubkeyData, err := b.GetCompressedPublicKey(fromPublicKey, false)
matchedRsvMap := make(map[string]struct{})
var cPkData []byte
for _, msgHash := range msgHashes {
matched := false
for _, rsv := range rsvs {
if _, exist := matchedRsvMap[rsv]; exist {
continue
}
cPkData, err = b.getPkDataFromSig(rsv, msgHash, true)
if err == nil && bytes.Equal(cPkData, fromPubkeyData) {
matchedRsvMap[rsv] = struct{}{}
newRsvs = append(newRsvs, rsv)
matched = true
break
}
}
if !matched {
return nil, fmt.Errorf("msgHash %v hash no matched rsv", msgHash)
}
}
return newRsvs, err
}