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sign_context.go
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sign_context.go
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package wallet
import (
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"github.com/DigitalLabs-web3/neo-go-evm/cli/input"
"github.com/DigitalLabs-web3/neo-go-evm/pkg/core/transaction"
"github.com/DigitalLabs-web3/neo-go-evm/pkg/crypto"
"github.com/DigitalLabs-web3/neo-go-evm/pkg/crypto/hash"
"github.com/DigitalLabs-web3/neo-go-evm/pkg/crypto/keys"
"github.com/DigitalLabs-web3/neo-go-evm/pkg/wallet"
"github.com/ethereum/go-ethereum/common/hexutil"
)
type SignContext struct {
ChainID uint64
Tx transaction.NeoTx
Parameters map[string][]byte
M int
}
func (sc *SignContext) Check() error {
if sc.Tx.From != hash.Hash160(sc.Tx.Witness.VerificationScript) {
return errors.New("invalid verification")
}
pks, m, err := crypto.ParseMultiVerificationScript(sc.Tx.Witness.VerificationScript)
if err != nil {
return err
}
if sc.M != m {
return errors.New("invalid sigs count")
}
sc.M = m
for pkstring, sig := range sc.Parameters {
if len(sig) > 0 {
pubkey, err := keys.NewPublicKeyFromString(pkstring)
if !pks.Contains(pubkey) || err != nil {
return errors.New("invalid public key")
}
if !pubkey.VerifyHashable(sig, sc.ChainID, &sc.Tx) {
return errors.New("invalid signature")
}
}
}
return nil
}
func (sc SignContext) IsComplete() bool {
sigCount := 0
for _, sig := range sc.Parameters {
if len(sig) > 0 {
sigCount++
}
}
return sc.M == sigCount
}
func (sc *SignContext) CreateTx() (*transaction.Transaction, error) {
if !sc.IsComplete() {
return nil, errors.New("sign context is incomplete")
}
pks, _, err := crypto.ParseMultiVerificationScript(sc.Tx.Witness.VerificationScript)
if err != nil {
return nil, errors.New("can't parse multi-sig account script")
}
sigs := make([][]byte, sc.M)
i := 0
for _, pk := range pks {
pkstring := hex.EncodeToString(pk.Bytes())
if sc.Parameters[pkstring] != nil {
sigs[i] = sc.Parameters[pkstring]
i++
}
}
sc.Tx.Witness.InvocationScript = crypto.CreateMultiInvocationScript(sigs)
return transaction.NewTx(&sc.Tx), nil
}
type signContextJson struct {
ChainID hexutil.Uint64 `json:"chainId"`
Tx transaction.NeoTx `json:"tx"`
M hexutil.Uint64 `json:"m"`
Parameters map[string]hexutil.Bytes `json:"parameters"`
}
func (sc SignContext) MarshalJSON() ([]byte, error) {
scj := &signContextJson{
ChainID: hexutil.Uint64(sc.ChainID),
Tx: sc.Tx,
}
scj.Parameters = make(map[string]hexutil.Bytes)
scj.M = hexutil.Uint64(sc.M)
for k, v := range sc.Parameters {
scj.Parameters[k] = v
}
return json.Marshal(scj)
}
func (sc *SignContext) UnmarshalJSON(b []byte) error {
scj := new(signContextJson)
err := json.Unmarshal(b, scj)
if err != nil {
return err
}
sc.ChainID = uint64(scj.ChainID)
sc.Tx = scj.Tx
sc.Parameters = make(map[string][]byte)
for k, v := range scj.Parameters {
sc.Parameters[k] = v
}
sc.M = int(scj.M)
err = sc.Check()
if err != nil {
return err
}
return nil
}
func Sign(wall *wallet.Wallet, context *SignContext) error {
pks, _, err := crypto.ParseMultiVerificationScript(context.Tx.Witness.VerificationScript)
if err != nil {
return fmt.Errorf("can't parse multi-sig account script: %w", err)
}
haspk := false
for _, acc := range wall.Accounts {
for _, p := range pks {
if p.Address() == acc.Address {
haspk = true
pass, err := input.ReadPassword(fmt.Sprintf("Enter password for %s > ", acc.Address))
if err != nil {
return fmt.Errorf("error reading password: %w", err)
}
err = acc.Decrypt(pass, wall.Scrypt)
if err != nil {
return fmt.Errorf("unable to decrypt account: %s", acc.Address)
}
sig := acc.PrivateKey().SignHashable(context.ChainID, &context.Tx)
context.Parameters[hex.EncodeToString(p.Bytes())] = sig
if len(context.Parameters) == context.M {
return nil
}
}
}
}
if !haspk {
return fmt.Errorf("no existent private key in wallet")
}
return nil
}