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bftMultiSigValidator.go
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bftMultiSigValidator.go
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package bft
import (
"fmt"
"github.com/drep-project/DREP-Chain/chain/block"
"github.com/drep-project/DREP-Chain/crypto"
"github.com/drep-project/DREP-Chain/crypto/secp256k1"
"github.com/drep-project/DREP-Chain/crypto/secp256k1/schnorr"
"github.com/drep-project/DREP-Chain/crypto/sha3"
"github.com/drep-project/DREP-Chain/types"
"github.com/drep-project/binary"
)
type GetProducers func(uint64, int) ([]types.Producer, error)
type GetBlock func(hash *crypto.Hash) (*types.Block, error)
type BlockMultiSigValidator struct {
getProducers GetProducers
getBlock GetBlock
producerNum int
}
//func NewBlockMultiSigValidator(getProducers GetProducers, getBlock GetBlock, producerNum int) *BlockMultiSigValidator {
// return &BlockMultiSigValidator{getProducers, getBlock, producerNum}
//}
func (blockMultiSigValidator *BlockMultiSigValidator) VerifyHeader(header, parent *types.BlockHeader) error {
// check multisig
// leader
return nil
}
func (blockMultiSigValidator *BlockMultiSigValidator) VerifyBody(block *types.Block) error {
participators := []*secp256k1.PublicKey{}
multiSig := &MultiSignature{}
err := binary.Unmarshal(block.Proof.Evidence, multiSig)
if err != nil {
return err
}
parentBlock, err := blockMultiSigValidator.getBlock(&block.Header.PreviousHash)
if err != nil {
return err
}
producers, err := blockMultiSigValidator.getProducers(parentBlock.Header.Height, MAX_PRODUCER)
if err != nil {
return err
}
if len(producers) != len(multiSig.Bitmap) {
return fmt.Errorf("producer num:%d != multisig num:%d", len(producers), len(multiSig.Bitmap))
}
for index, val := range multiSig.Bitmap {
if val == 1 {
producer := producers[index]
participators = append(participators, producer.Pubkey)
}
}
msg := block.AsSignMessage()
sigmaPk := schnorr.CombinePubkeys(participators)
if !schnorr.Verify(sigmaPk, sha3.Keccak256(msg), multiSig.Sig.R, multiSig.Sig.S) {
return ErrMultiSig
}
return nil
}
func (blockMultiSigValidator *BlockMultiSigValidator) ExecuteBlock(context *block.BlockExecuteContext) error {
multiSig := &MultiSignature{}
parentBlock, err := blockMultiSigValidator.getBlock(&context.Block.Header.PreviousHash)
if err != nil {
return err
}
producers, err := blockMultiSigValidator.getProducers(parentBlock.Header.Height, MAX_PRODUCER)
if err != nil {
return err
}
err = binary.Unmarshal(context.Block.Proof.Evidence, multiSig)
if err != nil {
return nil
}
if len(producers) != len(multiSig.Bitmap) {
return fmt.Errorf("executeBlock producer num:%d != multisig num:%d", len(producers), len(multiSig.Bitmap))
}
calculator := NewRewardCalculator(context.TrieStore, multiSig, producers, context.GasFee, context.Block.Header.Height)
return calculator.AccumulateRewards(context.Block.Header.Height)
}