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// 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 (
"encoding/binary"
"sort"
"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"
)
func hashCompactionChainAck(block *types.Block) (common.Hash, error) {
binaryTime, err := block.ConsensusInfo.Timestamp.MarshalBinary()
if err != nil {
return common.Hash{}, err
}
binaryHeight := make([]byte, 8)
binary.LittleEndian.PutUint64(binaryHeight, block.ConsensusInfo.Height)
hash := crypto.Keccak256Hash(
block.ConsensusInfoParentHash[:],
binaryTime,
binaryHeight)
return hash, nil
}
func signCompactionChainAck(block *types.Block,
prv crypto.PrivateKey) (crypto.Signature, error) {
hash, err := hashCompactionChainAck(block)
if err != nil {
return crypto.Signature{}, err
}
return prv.Sign(hash)
}
func verifyCompactionChainAckSignature(pubkey crypto.PublicKey,
ackingBlock *types.Block, sig crypto.Signature) (bool, error) {
hash, err := hashCompactionChainAck(ackingBlock)
if err != nil {
return false, err
}
return pubkey.VerifySignature(hash, sig), nil
}
func hashBlock(blockConv types.BlockConverter) (common.Hash, error) {
block := blockConv.Block()
binaryHeight := make([]byte, 8)
binary.LittleEndian.PutUint64(binaryHeight, block.Height)
// Handling Block.Acks.
acks := make(common.Hashes, 0, len(block.Acks))
for ack := range block.Acks {
acks = append(acks, ack)
}
sort.Sort(acks)
binaryAcks := make([][]byte, len(block.Acks))
for idx := range acks {
binaryAcks[idx] = acks[idx][:]
}
hashAcks := crypto.Keccak256Hash(binaryAcks...)
// Handle Block.Timestamps.
// TODO(jimmy-dexon): Store and get the sorted validatorIDs.
validators := make(types.ValidatorIDs, 0, len(block.Timestamps))
for vID := range block.Timestamps {
validators = append(validators, vID)
}
sort.Sort(validators)
binaryTimestamps := make([][]byte, len(block.Timestamps))
for idx, vID := range validators {
var err error
binaryTimestamps[idx], err = block.Timestamps[vID].MarshalBinary()
if err != nil {
return common.Hash{}, err
}
}
hashTimestamps := crypto.Keccak256Hash(binaryTimestamps...)
payloadHash := crypto.Keccak256Hash(blockConv.GetPayloads()...)
hash := crypto.Keccak256Hash(
block.ProposerID.Hash[:],
block.ParentHash[:],
binaryHeight,
hashAcks[:],
hashTimestamps[:],
payloadHash[:])
return hash, nil
}
func signBlock(blockConv types.BlockConverter,
prv crypto.PrivateKey) (crypto.Signature, error) {
hash, err := hashBlock(blockConv)
if err != nil {
return crypto.Signature{}, err
}
return prv.Sign(hash)
}
func verifyBlockSignature(pubkey crypto.PublicKey,
blockConv types.BlockConverter, sig crypto.Signature) (bool, error) {
hash, err := hashBlock(blockConv)
if err != nil {
return false, err
}
return pubkey.VerifySignature(hash, sig), nil
}
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