136 lines
3.4 KiB
Go
136 lines
3.4 KiB
Go
package consensus
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import (
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"encoding/binary"
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"fmt"
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"math/big"
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"github.com/Secured-Finance/dione/pubsub"
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types2 "github.com/Secured-Finance/dione/consensus/types"
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"github.com/minio/blake2b-simd"
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"github.com/libp2p/go-libp2p-core/peer"
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"github.com/Secured-Finance/dione/types"
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crypto2 "github.com/filecoin-project/go-state-types/crypto"
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"github.com/libp2p/go-libp2p-core/crypto"
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"golang.org/x/xerrors"
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)
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type SignFunc func(peer.ID, []byte) (*types.Signature, error)
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func ComputeVRF(privKey crypto.PrivKey, sigInput []byte) ([]byte, error) {
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return privKey.Sign(sigInput)
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}
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func VerifyVRF(worker peer.ID, vrfBase, vrfproof []byte) error {
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pk, err := worker.ExtractPublicKey()
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if err != nil {
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return err
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}
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ok, err := pk.Verify(vrfproof, vrfBase)
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if err != nil {
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return err
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}
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if !ok {
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return fmt.Errorf("vrf was invalid")
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}
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return nil
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}
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func IsRoundWinner(round uint64,
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worker peer.ID, randomness []byte, minerStake, networkStake *big.Int, privKey crypto.PrivKey) (*types.ElectionProof, error) {
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buf, err := worker.MarshalBinary()
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if err != nil {
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return nil, fmt.Errorf("failed to marshal address: %w", err)
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}
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electionRand, err := DrawRandomness(randomness, crypto2.DomainSeparationTag_ElectionProofProduction, round, buf)
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if err != nil {
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return nil, fmt.Errorf("failed to draw randomness: %w", err)
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}
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vrfout, err := ComputeVRF(privKey, electionRand)
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if err != nil {
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return nil, fmt.Errorf("failed to compute VRF: %w", err)
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}
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ep := &types.ElectionProof{VRFProof: vrfout}
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j := ep.ComputeWinCount(minerStake, networkStake)
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ep.WinCount = j
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if j < 1 {
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return nil, nil
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}
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return ep, nil
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}
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func DrawRandomness(rbase []byte, pers crypto2.DomainSeparationTag, round uint64, entropy []byte) ([]byte, error) {
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h := blake2b.New256()
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if err := binary.Write(h, binary.BigEndian, int64(pers)); err != nil {
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return nil, xerrors.Errorf("deriving randomness: %v", err)
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}
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VRFDigest := blake2b.Sum256(rbase)
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_, err := h.Write(VRFDigest[:])
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if err != nil {
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return nil, xerrors.Errorf("hashing VRFDigest: %w", err)
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}
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if err := binary.Write(h, binary.BigEndian, round); err != nil {
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return nil, xerrors.Errorf("deriving randomness: %v", err)
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}
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_, err = h.Write(entropy)
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if err != nil {
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return nil, xerrors.Errorf("hashing entropy: %v", err)
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}
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return h.Sum(nil), nil
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}
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func NewMessage(cmsg types2.ConsensusMessage, typ types2.ConsensusMessageType, privKey crypto.PrivKey) (*pubsub.GenericMessage, error) {
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var message pubsub.GenericMessage
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switch typ {
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case types2.ConsensusMessageTypePrePrepare:
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{
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message.Type = pubsub.PrePrepareMessageType
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message.Payload = types2.PrePrepareMessage{
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Block: cmsg.Block,
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}
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break
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}
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case types2.ConsensusMessageTypePrepare:
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{
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message.Type = pubsub.PrepareMessageType
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pm := types2.PrepareMessage{
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Blockhash: cmsg.Blockhash,
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}
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signature, err := privKey.Sign(cmsg.Blockhash)
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if err != nil {
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return nil, fmt.Errorf("failed to create signature: %v", err)
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}
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pm.Signature = signature
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message.Payload = pm
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break
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}
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case types2.ConsensusMessageTypeCommit:
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{
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message.Type = pubsub.CommitMessageType
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pm := types2.CommitMessage{
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Blockhash: cmsg.Blockhash,
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}
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signature, err := privKey.Sign(cmsg.Blockhash)
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if err != nil {
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return nil, fmt.Errorf("failed to create signature: %v", err)
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}
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pm.Signature = signature
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message.Payload = pm
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break
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}
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}
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return &message, nil
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}
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