neoneo-go/pkg/services/stateroot/signature.go

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2021-02-02 09:34:27 +00:00
package stateroot
import (
"sync"
"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"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
)
type (
incompleteRoot struct {
sync.RWMutex
// isSent is true state root was already broadcasted.
isSent bool
// request is oracle request.
root *state.MPTRoot
// sigs contains signature from every oracle node.
sigs map[string]*rootSig
}
rootSig struct {
// pub is cached public key.
pub *keys.PublicKey
// ok is true if signature was verified.
ok bool
// sig is state root signature.
sig []byte
}
)
func newIncompleteRoot() *incompleteRoot {
return &incompleteRoot{
sigs: make(map[string]*rootSig),
}
}
func (r *incompleteRoot) reverify() {
txHash := r.root.GetSignedHash()
for _, sig := range r.sigs {
if !sig.ok {
sig.ok = sig.pub.Verify(sig.sig, txHash.BytesBE())
}
}
}
func (r *incompleteRoot) addSignature(pub *keys.PublicKey, sig []byte) {
r.sigs[string(pub.Bytes())] = &rootSig{
pub: pub,
ok: r.root != nil,
sig: sig,
}
}
// finalize checks is either main or backup tx has sufficient number of signatures and returns
// tx and bool value indicating if it is ready to be broadcasted.
func (r *incompleteRoot) finalize(stateValidators keys.PublicKeys) (*state.MPTRoot, bool) {
if r.root == nil {
return nil, false
}
m := smartcontract.GetDefaultHonestNodeCount(len(stateValidators))
sigs := make([][]byte, 0, m)
for _, pub := range stateValidators {
sig, ok := r.sigs[string(pub.Bytes())]
if ok && sig.ok {
sigs = append(sigs, sig.sig)
if len(sigs) == m {
break
}
}
}
if len(sigs) != m {
return nil, false
}
w := io.NewBufBinWriter()
for i := range sigs {
emit.Bytes(w.BinWriter, sigs[i])
}
r.root.Witness = &transaction.Witness{
InvocationScript: w.Bytes(),
}
return r.root, true
}