path: root/core/crypto_test.go

// 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
}

func (s *CryptoTestSuite) newBlock(prevBlock *types.Block) *types.Block {
    if prevBlock == nil {
        return &types.Block{
            Hash: common.NewRandomHash(),
            ConsensusInfo: types.ConsensusInfo{
                Timestamp: time.Now(),
                Height:    0,
            },
        }
    }
    parentHash, err := hashCompactionChainAck(prevBlock)
    s.Require().Nil(err)
    return &types.Block{
        Hash: common.NewRandomHash(),
        ConsensusInfoParentHash: parentHash,
        CompactionChainAck: types.CompactionChainAck{
            AckingBlockHash: prevBlock.Hash,
        },
        ConsensusInfo: types.ConsensusInfo{
            Timestamp: time.Now(),
            Height:    prevBlock.ConsensusInfo.Height + 1,
        },
    }
}

func (s *CryptoTestSuite) generateCompactionChain(
    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
        if idx > 0 {
            block.ConsensusInfoParentHash, err = hashCompactionChainAck(blocks[idx-1])
            s.Require().Nil(err)
            block.CompactionChainAck.ConsensusSignature, err =
                signCompactionChainAck(blocks[idx-1], prv)
            s.Require().Nil(err)
        }
    }
    return blocks
}

func (s *CryptoTestSuite) TestSignature() {
    prv, err := eth.NewPrivateKey()
    pub := prv.PublicKey()
    s.Require().Nil(err)
    blocks := s.generateCompactionChain(10, prv)
    blockMap := make(map[common.Hash]*types.Block)
    for _, block := range blocks {
        blockMap[block.Hash] = block
    }
    for _, block := range blocks {
        if block.ConsensusInfo.Height == 0 {
            continue
        }
        ackingBlock, exist := blockMap[block.CompactionChainAck.AckingBlockHash]
        s.Require().True(exist)
        s.True(ackingBlock.ConsensusInfo.Height == block.ConsensusInfo.Height-1)
        hash, err := hashCompactionChainAck(ackingBlock)
        s.Require().Nil(err)
        s.Equal(hash, block.ConsensusInfoParentHash)
        s.True(verifyCompactionChainAckSignature(
            pub, ackingBlock, block.CompactionChainAck.ConsensusSignature))
    }
    // Modify Block.ConsensusTime and verify signature again.
    for _, block := range blocks {
        block.ConsensusInfo.Timestamp = time.Time{}
        if block.ConsensusInfo.Height == 0 {
            continue
        }
        ackingBlock, exist := blockMap[block.CompactionChainAck.AckingBlockHash]
        s.Require().True(exist)
        s.False(verifyCompactionChainAckSignature(
            pub, ackingBlock, block.CompactionChainAck.ConsensusSignature))
    }
}

func TestCrypto(t *testing.T) {
    suite.Run(t, new(CryptoTestSuite))
}