dione/consensus/leader.go

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package consensus
import (
"bytes"
"context"
"fmt"
"github.com/Secured-Finance/dione/types"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-state-types/crypto"
"github.com/filecoin-project/lotus/lib/sigs"
"go.opencensus.io/trace"
"golang.org/x/xerrors"
)
type SignFunc func(context.Context, address.Address, []byte) (*crypto.Signature, error)
func ComputeVRF(ctx context.Context, sign SignFunc, worker address.Address, sigInput []byte) ([]byte, error) {
sig, err := sign(ctx, worker, sigInput)
if err != nil {
return nil, err
}
if sig.Type != crypto.SigTypeBLS {
return nil, fmt.Errorf("miner worker address was not a BLS key")
}
return sig.Data, nil
}
func VerifyVRF(ctx context.Context, worker address.Address, vrfBase, vrfproof []byte) error {
_, span := trace.StartSpan(ctx, "VerifyVRF")
defer span.End()
sig := &crypto.Signature{
Type: crypto.SigTypeBLS,
Data: vrfproof,
}
if err := sigs.Verify(sig, worker, vrfBase); err != nil {
return xerrors.Errorf("vrf was invalid: %w", err)
}
return nil
}
func IsRoundWinner(ctx context.Context, round types.TaskEpoch,
worker address.Address, brand types.BeaconEntry, mb *MinerBase, a MinerAPI) (*types.ElectionProof, error) {
buf := new(bytes.Buffer)
if err := worker.MarshalCBOR(buf); err != nil {
return nil, xerrors.Errorf("failed to cbor marshal address: %w", err)
}
electionRand, err := DrawRandomness(brand.Data, crypto.DomainSeparationTag_ElectionProofProduction, round, buf.Bytes())
if err != nil {
return nil, xerrors.Errorf("failed to draw randomness: %w", err)
}
vrfout, err := ComputeVRF(ctx, a.WalletSign, mb.WorkerKey, electionRand)
if err != nil {
return nil, xerrors.Errorf("failed to compute VRF: %w", err)
}
ep := &types.ElectionProof{VRFProof: vrfout}
j := ep.ComputeWinCount(mb.MinerStake, mb.NetworkStake)
ep.WinCount = j
if j < 1 {
return nil, nil
}
return ep, nil
}