// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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-core 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-core library. If not, see
// <http://www.gnu.org/licenses/>.
package core
import (
"testing"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
"github.com/dexon-foundation/dexon-consensus-core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/crypto/eth"
"github.com/stretchr/testify/suite"
)
type CryptoTestSuite struct {
suite.Suite
}
var myVID = types.ValidatorID{Hash: common.NewRandomHash()}
type simpleBlock struct {
block *types.Block
}
func (sb *simpleBlock) Block() *types.Block {
return sb.block
}
func (sb *simpleBlock) Payloads() [][]byte {
return [][]byte{}
}
func (sb *simpleBlock) SetBlock(block *types.Block) {
*sb.block = *block
}
func (s *CryptoTestSuite) prepareBlock(prevBlock *types.Block) *types.Block {
acks := make(map[common.Hash]struct{})
timestamps := make(map[types.ValidatorID]time.Time)
timestamps[myVID] = time.Now().UTC()
if prevBlock == nil {
return &types.Block{
Acks: acks,
Timestamps: timestamps,
Notary: types.Notary{
Timestamp: time.Now(),
Height: 0,
},
}
}
parentHash, err := hashNotary(prevBlock)
s.Require().Nil(err)
s.Require().NotEqual(prevBlock.Hash, common.Hash{})
acks[parentHash] = struct{}{}
return &types.Block{
ParentHash: prevBlock.Hash,
Acks: acks,
Timestamps: timestamps,
Height: prevBlock.Height + 1,
Notary: types.Notary{
ParentHash: parentHash,
Timestamp: time.Now(),
Height: prevBlock.Notary.Height + 1,
},
}
}
func (s *CryptoTestSuite) newBlock(prevBlock *types.Block) *types.Block {
block := s.prepareBlock(prevBlock)
var err error
block.Hash, err = hashBlock(&simpleBlock{block: block})
s.Require().Nil(err)
return block
}
func (s *CryptoTestSuite) generateCompactionChain(
length int, prv crypto.PrivateKey) (
[]*types.Block, []types.NotaryAck) {
blocks := make([]*types.Block, length)
notaryAcks := make([]types.NotaryAck, length)
var prevBlock *types.Block
for idx := range blocks {
block := s.newBlock(prevBlock)
prevBlock = block
blocks[idx] = block
var err error
notaryAcks[idx].Hash, err = hashNotary(blocks[idx])
s.Require().Nil(err)
notaryAcks[idx].NotaryBlockHash = blocks[idx].Hash
notaryAcks[idx].Signature, err = prv.Sign(notaryAcks[idx].Hash)
s.Require().Nil(err)
if idx > 0 {
block.Notary.ParentHash = notaryAcks[idx-1].Hash
}
}
return blocks, notaryAcks
}
func (s *CryptoTestSuite) TestNotaryAckSignature() {
prv, err := eth.NewPrivateKey()
pub := prv.PublicKey()
s.Require().Nil(err)
blocks, notaryAcks := s.generateCompactionChain(10, prv)
blockMap := make(map[common.Hash]*types.Block)
for _, block := range blocks {
blockMap[block.Hash] = block
}
parentBlock := blocks[0]
for _, notaryAck := range notaryAcks {
notaryBlock, exist := blockMap[notaryAck.NotaryBlockHash]
s.Require().True(exist)
if notaryBlock.Notary.Height == 0 {
continue
}
s.True(parentBlock.Notary.Height == notaryBlock.Notary.Height-1)
hash, err := hashNotary(parentBlock)
s.Require().Nil(err)
s.Equal(hash, notaryBlock.Notary.ParentHash)
s.True(verifyNotarySignature(
pub, notaryBlock, notaryAck.Signature))
parentBlock = notaryBlock
}
// Modify Block.Notary.Timestamp and verify signature again.
for _, notaryAck := range notaryAcks {
block, exist := blockMap[notaryAck.NotaryBlockHash]
s.Require().True(exist)
block.Notary.Timestamp = time.Time{}
ackingBlock, exist := blockMap[notaryAck.NotaryBlockHash]
s.Require().True(exist)
s.False(verifyNotarySignature(
pub, ackingBlock, notaryAck.Signature))
}
}
func (s *CryptoTestSuite) generateBlockChain(
length int, prv crypto.PrivateKey) []*types.Block {
blocks := make([]*types.Block, length)
var prevBlock *types.Block
for idx := range blocks {
block := s.newBlock(prevBlock)
blocks[idx] = block
var err error
block.Signature, err = prv.Sign(block.Hash)
s.Require().Nil(err)
}
return blocks
}
func (s *CryptoTestSuite) TestBlockSignature() {
prv, err := eth.NewPrivateKey()
pub := prv.PublicKey()
s.Require().Nil(err)
blocks := s.generateBlockChain(10, prv)
blockMap := make(map[common.Hash]*types.Block)
for _, block := range blocks {
blockMap[block.Hash] = block
}
for _, block := range blocks {
if !block.IsGenesis() {
parentBlock, exist := blockMap[block.ParentHash]
s.Require().True(exist)
s.True(parentBlock.Height == block.Height-1)
hash, err := hashBlock(&simpleBlock{block: parentBlock})
s.Require().Nil(err)
s.Equal(hash, block.ParentHash)
}
s.True(verifyBlockSignature(pub, &simpleBlock{block: block}, block.Signature))
}
// Modify Block.Acks and verify signature again.
for _, block := range blocks {
block.Acks[common.NewRandomHash()] = struct{}{}
s.False(verifyBlockSignature(
pub, &simpleBlock{block: block}, block.Signature))
}
}
func TestCrypto(t *testing.T) {
suite.Run(t, new(CryptoTestSuite))
}
