state: drop Network from MPTRoot structure

It's only needed to verify/sign.

pkg/core/state/mpt_root.go

@@ -1,9 +1,6 @@
 package state
 
 import (
-	"encoding/binary"
-
-	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -12,27 +9,12 @@ import (
 
 // MPTRoot represents storage state root together with sign info.
 type MPTRoot struct {
-	Network netmode.Magic        `json:"-"`
 	Version byte                 `json:"version"`
 	Index   uint32               `json:"index"`
 	Root    util.Uint256         `json:"stateroot"`
 	Witness *transaction.Witness `json:"witness,omitempty"`
 }
 
-// GetSignedPart returns part of MPTRootBase which needs to be signed.
-func (s *MPTRoot) GetSignedPart() []byte {
-	b := make([]byte, 4+32)
-	binary.LittleEndian.PutUint32(b, uint32(s.Network))
-	h := s.Hash()
-	copy(b[4:], h[:])
-	return b
-}
-
-// GetSignedHash returns hash of MPTRootBase which needs to be signed.
-func (s *MPTRoot) GetSignedHash() util.Uint256 {
-	return hash.Sha256(s.GetSignedPart())
-}
-
 // Hash returns hash of s.
 func (s *MPTRoot) Hash() util.Uint256 {
 	buf := io.NewBufBinWriter()

pkg/core/stateroot/module.go

@@ -116,7 +116,6 @@ func (s *Module) AddMPTBatch(index uint32, b mpt.Batch) error {
 	}
 	s.mpt.Flush()
 	err := s.addLocalStateRoot(&state.MPTRoot{
-		Network: s.network,
 		Index: index,
 		Root:  s.mpt.StateRoot(),
 	})

pkg/core/stateroot/store.go

@@ -46,7 +46,7 @@ func (s *Module) getStateRoot(key []byte) (*state.MPTRoot, error) {
 		return nil, err
 	}
 
-	sr := &state.MPTRoot{Network: s.network}
+	sr := &state.MPTRoot{}
 	r := io.NewBinReaderFromBuf(data)
 	sr.DecodeBinary(r)
 	return sr, r.Err

pkg/core/stateroot_test.go

@@ -33,7 +33,7 @@ func testSignStateRoot(t *testing.T, r *state.MPTRoot, pubs keys.PublicKeys, acc
 	n := smartcontract.GetMajorityHonestNodeCount(len(accs))
 	w := io.NewBufBinWriter()
 	for i := 0; i < n; i++ {
-		sig := accs[i].PrivateKey().SignHash(r.GetSignedHash())
+		sig := accs[i].PrivateKey().SignHashable(uint32(netmode.UnitTestNet), r)
 		emit.Bytes(w.BinWriter, sig)
 	}
 	require.NoError(t, w.Err)
@@ -44,7 +44,7 @@ func testSignStateRoot(t *testing.T, r *state.MPTRoot, pubs keys.PublicKeys, acc
 		VerificationScript: script,
 		InvocationScript:   w.Bytes(),
 	}
-	data, err := testserdes.EncodeBinary(stateroot.NewMessage(netmode.UnitTestNet, stateroot.RootT, r))
+	data, err := testserdes.EncodeBinary(stateroot.NewMessage(stateroot.RootT, r))
 	require.NoError(t, err)
 	return data
 }
@@ -97,7 +97,7 @@ func TestStateRoot(t *testing.T) {
 	t.Run("drop zero index", func(t *testing.T) {
 		r, err := srv.GetStateRoot(0)
 		require.NoError(t, err)
-		data, err := testserdes.EncodeBinary(stateroot.NewMessage(netmode.UnitTestNet, stateroot.RootT, r))
+		data, err := testserdes.EncodeBinary(stateroot.NewMessage(stateroot.RootT, r))
 		require.NoError(t, err)
 		require.NoError(t, srv.OnPayload(&payload.Extensible{Data: data}))
 		require.EqualValues(t, 0, srv.CurrentValidatedHeight())
@@ -221,7 +221,7 @@ func TestStateRootFull(t *testing.T) {
 
 	r, err := srv.GetStateRoot(2)
 	require.NoError(t, err)
-	require.NoError(t, srv.AddSignature(2, 0, accs[0].PrivateKey().SignHash(r.GetSignedHash())))
+	require.NoError(t, srv.AddSignature(2, 0, accs[0].PrivateKey().SignHashable(uint32(netmode.UnitTestNet), r)))
 	require.NotNil(t, lastValidated.Load().(*payload.Extensible))
 
 	msg := new(stateroot.Message)
@@ -250,5 +250,5 @@ func checkVoteBroadcasted(t *testing.T, bc *Blockchain, p *payload.Extensible,
 
 	pubs, _, err := bc.contracts.Designate.GetDesignatedByRole(bc.dao, noderoles.StateValidator, bc.BlockHeight())
 	require.True(t, len(pubs) > int(valIndex))
-	require.True(t, pubs[valIndex].Verify(vote.Signature, r.GetSignedHash().BytesBE()))
+	require.True(t, pubs[valIndex].VerifyHashable(vote.Signature, uint32(netmode.UnitTestNet), r))
 }

pkg/rpc/server/server_test.go

@@ -1364,7 +1364,7 @@ func testRPCProtocol(t *testing.T, doRPCCall func(string, string, *testing.T) []
 			body := doRPCCall(rpc, httpSrv.URL, t)
 			rawRes := checkErrGetResult(t, body, false)
 
-			res := &state.MPTRoot{Network: netmode.UnitTestNet}
+			res := &state.MPTRoot{}
 			require.NoError(t, json.Unmarshal(rawRes, res))
 			require.NotEqual(t, util.Uint256{}, res.Root) // be sure this test uses valid height
 

pkg/services/stateroot/message.go

@@ -3,7 +3,6 @@ package stateroot
 import (
 	"fmt"
 
-	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 )
@@ -14,7 +13,6 @@ type (
 
 	// Message represents state-root related message.
 	Message struct {
-		Network netmode.Magic
 		Type    MessageType
 		Payload io.Serializable
 	}
@@ -27,9 +25,8 @@ const (
 )
 
 // NewMessage creates new message of specified type.
-func NewMessage(net netmode.Magic, typ MessageType, p io.Serializable) *Message {
+func NewMessage(typ MessageType, p io.Serializable) *Message {
 	return &Message{
-		Network: net,
 		Type:    typ,
 		Payload: p,
 	}
@@ -47,7 +44,7 @@ func (m *Message) DecodeBinary(r *io.BinReader) {
 	case VoteT:
 		m.Payload = new(Vote)
 	case RootT:
-		m.Payload = &state.MPTRoot{Network: m.Network}
+		m.Payload = new(state.MPTRoot)
 	default:
 		r.Err = fmt.Errorf("invalid type: %x", m.Type)
 		return

pkg/services/stateroot/network.go

@@ -40,7 +40,7 @@ func (s *service) AddSignature(height uint32, validatorIndex int32, sig []byte)
 
 	incRoot.Lock()
 	if incRoot.root != nil {
-		ok := pub.Verify(sig, incRoot.root.GetSignedHash().BytesBE())
+		ok := pub.VerifyHashable(sig, uint32(s.Network), incRoot.root)
 		if !ok {
 			incRoot.Unlock()
 			return fmt.Errorf("invalid state root signature for %d", validatorIndex)
@@ -78,7 +78,7 @@ func (s *service) getIncompleteRoot(height uint32) *incompleteRoot {
 
 func (s *service) sendValidatedRoot(r *state.MPTRoot, priv *keys.PrivateKey) {
 	w := io.NewBufBinWriter()
-	m := NewMessage(s.Network, RootT, r)
+	m := NewMessage(RootT, r)
 	m.EncodeBinary(w.BinWriter)
 	ep := &payload.Extensible{
 		ValidBlockStart: r.Index,

pkg/services/stateroot/service.go

@@ -95,7 +95,7 @@ func New(cfg config.StateRoot, log *zap.Logger, bc blockchainer.Blockchainer) (S
 
 // OnPayload implements Service interface.
 func (s *service) OnPayload(ep *payload.Extensible) error {
-	m := &Message{Network: s.Network}
+	m := &Message{}
 	r := io.NewBinReaderFromBuf(ep.Data)
 	m.DecodeBinary(r)
 	if r.Err != nil {

pkg/services/stateroot/signature.go

@@ -3,6 +3,7 @@ package stateroot
 import (
 	"sync"
 
+	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
@@ -38,11 +39,10 @@ func newIncompleteRoot() *incompleteRoot {
 	}
 }
 
-func (r *incompleteRoot) reverify() {
+func (r *incompleteRoot) reverify(net netmode.Magic) {
-	txHash := r.root.GetSignedHash()
 	for _, sig := range r.sigs {
 		if !sig.ok {
-			sig.ok = sig.pub.Verify(sig.sig, txHash.BytesBE())
+			sig.ok = sig.pub.VerifyHashable(sig.sig, uint32(net), r.root)
 		}
 	}
 }

pkg/services/stateroot/validators.go

@@ -47,16 +47,16 @@ func (s *service) signAndSend(r *state.MPTRoot) error {
 		return nil
 	}
 
-	sig := acc.PrivateKey().SignHash(r.GetSignedHash())
+	sig := acc.PrivateKey().SignHashable(uint32(s.Network), r)
 	incRoot := s.getIncompleteRoot(r.Index)
 	incRoot.root = r
 	incRoot.addSignature(acc.PrivateKey().PublicKey(), sig)
-	incRoot.reverify()
+	incRoot.reverify(s.Network)
 
 	s.accMtx.RLock()
 	myIndex := s.myIndex
 	s.accMtx.RUnlock()
-	msg := NewMessage(s.Network, VoteT, &Vote{
+	msg := NewMessage(VoteT, &Vote{
 		ValidatorIndex: int32(myIndex),
 		Height:         r.Index,
 		Signature:      sig,