Update project structure and build process

libwallet/V1.go

@@ -0,0 +1,81 @@
+package libwallet
+
+import (
+	"fmt"
+
+	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/btcsuite/btcd/txscript"
+	"github.com/btcsuite/btcd/wire"
+	"github.com/btcsuite/btcutil"
+	"github.com/muun/libwallet/addresses"
+	"github.com/muun/libwallet/btcsuitew/txscriptw"
+)
+
+// CreateAddressV1 returns a P2PKH MuunAddress from a publicKey for use in TransactionSchemeV1
+func CreateAddressV1(publicKey *HDPublicKey) (MuunAddress, error) {
+	return addresses.CreateAddressV1(&publicKey.key, publicKey.Path, publicKey.Network.network)
+}
+
+type coinV1 struct {
+	Network  *chaincfg.Params
+	OutPoint wire.OutPoint
+	KeyPath  string
+}
+
+func (c *coinV1) SignInput(index int, tx *wire.MsgTx, userKey *HDPrivateKey, _ *HDPublicKey) error {
+	userKey, err := userKey.DeriveTo(c.KeyPath)
+	if err != nil {
+		return fmt.Errorf("failed to derive user key: %w", err)
+	}
+
+	sig, err := c.signature(index, tx, userKey)
+	if err != nil {
+		return fmt.Errorf("failed to sign V1 input: %w", err)
+	}
+
+	builder := txscript.NewScriptBuilder()
+	builder.AddData(sig)
+	builder.AddData(userKey.PublicKey().Raw())
+	script, err := builder.Script()
+	if err != nil {
+		return fmt.Errorf("failed to generate signing script: %w", err)
+	}
+
+	txInput := tx.TxIn[index]
+	txInput.SignatureScript = script
+	return nil
+}
+
+func (c *coinV1) FullySignInput(index int, tx *wire.MsgTx, userKey, muunKey *HDPrivateKey) error {
+	return c.SignInput(index, tx, userKey, nil)
+}
+
+func (c *coinV1) createRedeemScript(publicKey *HDPublicKey) ([]byte, error) {
+
+	userAddress, err := btcutil.NewAddressPubKey(publicKey.Raw(), c.Network)
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate address for user: %w", err)
+	}
+
+	return txscriptw.PayToAddrScript(userAddress.AddressPubKeyHash())
+}
+
+func (c *coinV1) signature(index int, tx *wire.MsgTx, userKey *HDPrivateKey) ([]byte, error) {
+
+	redeemScript, err := c.createRedeemScript(userKey.PublicKey())
+	if err != nil {
+		return nil, fmt.Errorf("failed to build reedem script for signing: %w", err)
+	}
+
+	privKey, err := userKey.key.ECPrivKey()
+	if err != nil {
+		return nil, fmt.Errorf("failed to produce EC priv key for signing: %w", err)
+	}
+
+	sig, err := txscript.RawTxInSignature(tx, index, redeemScript, txscript.SigHashAll, privKey)
+	if err != nil {
+		return nil, fmt.Errorf("failed to sign V1 input: %w", err)
+	}
+
+	return sig, nil
+}