70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package consensus
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import (
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"context"
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"fmt"
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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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"github.com/filecoin-project/go-state-types/crypto"
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"golang.org/x/xerrors"
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)
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type SignFunc func(context.Context, peer.ID, []byte) (*types.Signature, error)
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func ComputeVRF(ctx context.Context, sign SignFunc, worker peer.ID, sigInput []byte) ([]byte, error) {
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sig, err := sign(ctx, worker, sigInput)
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if err != nil {
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return nil, err
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}
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if sig.Type != types.SigTypeEd25519 {
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return nil, fmt.Errorf("miner worker address was not a Ed25519 key")
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}
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return sig.Data, nil
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}
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func VerifyVRF(ctx context.Context, worker peer.ID, vrfBase, vrfproof []byte) error {
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pKey, err := worker.ExtractPublicKey()
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if err != nil {
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return xerrors.Errorf("failed to extract public key from worker address: %w", err)
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}
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valid, err := pKey.Verify(vrfBase, vrfproof)
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if err != nil || !valid {
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return xerrors.Errorf("vrf was invalid: %w", err)
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}
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return nil
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}
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func IsRoundWinner(ctx context.Context, round types.DrandRound,
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worker peer.ID, brand types.BeaconEntry, minerStake, networkStake types.BigInt, a WalletAPI) (*types.ElectionProof, error) {
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buf, err := worker.MarshalBinary()
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if err != nil {
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return nil, xerrors.Errorf("failed to marshal address: %w", err)
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}
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electionRand, err := DrawRandomness(brand.Data, crypto.DomainSeparationTag_ElectionProofProduction, round, buf)
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if err != nil {
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return nil, xerrors.Errorf("failed to draw randomness: %w", err)
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}
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vrfout, err := ComputeVRF(ctx, a.WalletSign, worker, electionRand)
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if err != nil {
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return nil, xerrors.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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