dione/consensus/utils.go

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package consensus
import (
"encoding/binary"
"fmt"
"github.com/fxamacker/cbor/v2"
"github.com/Secured-Finance/dione/pubsub"
types2 "github.com/Secured-Finance/dione/consensus/types"
"github.com/mitchellh/hashstructure/v2"
"github.com/Secured-Finance/dione/sigs"
"github.com/minio/blake2b-simd"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/Secured-Finance/dione/types"
"github.com/filecoin-project/go-state-types/crypto"
"golang.org/x/xerrors"
)
type SignFunc func(peer.ID, []byte) (*types.Signature, error)
func ComputeVRF(sign SignFunc, worker peer.ID, sigInput []byte) ([]byte, error) {
sig, err := sign(worker, sigInput)
if err != nil {
return nil, err
}
if sig.Type != types.SigTypeEd25519 {
return nil, fmt.Errorf("miner worker address was not a Ed25519 key")
}
return sig.Data, nil
}
func VerifyVRF(worker peer.ID, vrfBase, vrfproof []byte) error {
err := sigs.Verify(&types.Signature{Type: types.SigTypeEd25519, Data: vrfproof}, []byte(worker), vrfBase)
if err != nil {
return xerrors.Errorf("vrf was invalid: %w", err)
}
return nil
}
func IsRoundWinner(round types.DrandRound,
worker peer.ID, brand types.BeaconEntry, minerStake, networkStake types.BigInt, sign SignFunc) (*types.ElectionProof, error) {
buf, err := worker.MarshalBinary()
if err != nil {
return nil, xerrors.Errorf("failed to marshal address: %w", err)
}
electionRand, err := DrawRandomness(brand.Data, crypto.DomainSeparationTag_ElectionProofProduction, round, buf)
if err != nil {
return nil, xerrors.Errorf("failed to draw randomness: %w", err)
}
vrfout, err := ComputeVRF(sign, worker, electionRand)
if err != nil {
return nil, xerrors.Errorf("failed to compute VRF: %w", err)
}
ep := &types.ElectionProof{VRFProof: vrfout}
j := ep.ComputeWinCount(minerStake, networkStake)
ep.WinCount = j
if j < 1 {
return nil, nil
}
return ep, nil
}
func DrawRandomness(rbase []byte, pers crypto.DomainSeparationTag, round types.DrandRound, entropy []byte) ([]byte, error) {
h := blake2b.New256()
if err := binary.Write(h, binary.BigEndian, int64(pers)); err != nil {
return nil, xerrors.Errorf("deriving randomness: %v", err)
}
VRFDigest := blake2b.Sum256(rbase)
_, err := h.Write(VRFDigest[:])
if err != nil {
return nil, xerrors.Errorf("hashing VRFDigest: %w", err)
}
if err := binary.Write(h, binary.BigEndian, round); err != nil {
return nil, xerrors.Errorf("deriving randomness: %v", err)
}
_, err = h.Write(entropy)
if err != nil {
return nil, xerrors.Errorf("hashing entropy: %v", err)
}
return h.Sum(nil), nil
}
func VerifyTaskSignature(task types.DioneTask) error {
cHash, err := hashstructure.Hash(task, hashstructure.FormatV2, nil)
if err != nil {
return err
}
err = sigs.Verify(
&types.Signature{Type: types.SigTypeEd25519, Data: task.Signature},
[]byte(task.Miner),
[]byte(fmt.Sprintf("%v", cHash)),
)
if err != nil {
return err
}
return nil
}
func NewMessage(msg *pubsub.GenericMessage, typ pubsub.PubSubMessageType) (pubsub.GenericMessage, error) {
var newMsg pubsub.GenericMessage
newMsg.Type = typ
newCMsg := msg.Payload
newMsg.Payload = newCMsg
return newMsg, nil
}
func CreatePrePrepareWithTaskSignature(task *types.DioneTask, privateKey []byte) (*pubsub.GenericMessage, error) {
var message pubsub.GenericMessage
message.Type = pubsub.PrePrepareMessageType
cHash, err := hashstructure.Hash(task, hashstructure.FormatV2, nil)
if err != nil {
return nil, err
}
signature, err := sigs.Sign(types.SigTypeEd25519, privateKey, []byte(fmt.Sprintf("%v", cHash)))
if err != nil {
return nil, err
}
task.Signature = signature.Data
data, err := cbor.Marshal(types2.ConsensusMessage{Task: *task})
if err != nil {
return nil, err
}
message.Payload = data
return &message, nil
}