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