dione/consensus/leader.go

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package consensus
import (
"context"
"fmt"
"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(context.Context, peer.ID, []byte) (*types.Signature, error)
func ComputeVRF(ctx context.Context, sign SignFunc, worker peer.ID, sigInput []byte) ([]byte, error) {
sig, err := sign(ctx, 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(ctx context.Context, worker peer.ID, vrfBase, vrfproof []byte) error {
pKey, err := worker.ExtractPublicKey()
if err != nil {
return xerrors.Errorf("failed to extract public key from worker address: %w", err)
}
valid, err := pKey.Verify(vrfBase, vrfproof)
if err != nil || !valid {
return xerrors.Errorf("vrf was invalid: %w", err)
}
return nil
}
func IsRoundWinner(ctx context.Context, round types.DrandRound,
worker peer.ID, brand types.BeaconEntry, minerStake, networkStake types.BigInt, a WalletAPI) (*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(ctx, a.WalletSign, 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
}