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// Copyright 2019 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus library is free software: you can redistribute it
// and/or modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// The dexon-consensus library is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus library. If not, see
// <http://www.gnu.org/licenses/>.
package utils
import (
"errors"
"github.com/byzantine-lab/dexon-consensus/core/types"
typesDKG "github.com/byzantine-lab/dexon-consensus/core/types/dkg"
)
var (
// ErrInvalidDKGMasterPublicKey means the DKG MasterPublicKey is invalid.
ErrInvalidDKGMasterPublicKey = errors.New("invalid DKG master public key")
// ErrPayloadNotEmpty means the payload of block is not empty.
ErrPayloadNotEmpty = errors.New("payload not empty")
)
// NeedPenaltyDKGPrivateShare checks if the proposer of dkg private share
// should be penalized.
func NeedPenaltyDKGPrivateShare(
complaint *typesDKG.Complaint, mpk *typesDKG.MasterPublicKey) (bool, error) {
if complaint.IsNack() {
return false, nil
}
if mpk.ProposerID != complaint.PrivateShare.ProposerID {
return false, nil
}
ok, err := VerifyDKGMasterPublicKeySignature(mpk)
if err != nil {
return false, err
}
if !ok {
return false, ErrInvalidDKGMasterPublicKey
}
ok, err = VerifyDKGComplaintSignature(complaint)
if err != nil {
return false, err
}
if !ok {
return false, nil
}
ok, err = mpk.PublicKeyShares.VerifyPrvShare(
typesDKG.NewID(complaint.PrivateShare.ReceiverID),
&complaint.PrivateShare.PrivateShare)
if err != nil {
return false, err
}
return !ok, nil
}
// NeedPenaltyForkVote checks if two votes are fork vote.
func NeedPenaltyForkVote(vote1, vote2 *types.Vote) (bool, error) {
if vote1.ProposerID != vote2.ProposerID ||
vote1.Type != vote2.Type ||
vote1.Period != vote2.Period ||
vote1.Position != vote2.Position ||
vote1.BlockHash == vote2.BlockHash {
return false, nil
}
ok, err := VerifyVoteSignature(vote1)
if err != nil {
return false, err
}
if !ok {
return false, nil
}
ok, err = VerifyVoteSignature(vote2)
if err != nil {
return false, err
}
if !ok {
return false, nil
}
return true, nil
}
// NeedPenaltyForkBlock checks if two blocks are fork block.
func NeedPenaltyForkBlock(block1, block2 *types.Block) (bool, error) {
if block1.ProposerID != block2.ProposerID ||
block1.Position != block2.Position ||
block1.Hash == block2.Hash {
return false, nil
}
if len(block1.Payload) != 0 || len(block2.Payload) != 0 {
return false, ErrPayloadNotEmpty
}
verifyBlock := func(block *types.Block) (bool, error) {
err := VerifyBlockSignatureWithoutPayload(block)
switch err {
case nil:
return true, nil
case ErrIncorrectSignature:
return false, nil
case ErrIncorrectHash:
return false, nil
default:
return false, err
}
}
ok, err := verifyBlock(block1)
if err != nil {
return false, err
}
if !ok {
return false, nil
}
ok, err = verifyBlock(block2)
if err != nil {
return false, err
}
if !ok {
return false, nil
}
return true, nil
}
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