package main import ( "encoding/hex" "fmt" "strconv" "github.com/ipfs/go-cid" "github.com/urfave/cli/v2" "golang.org/x/xerrors" ffi "github.com/filecoin-project/filecoin-ffi" "github.com/filecoin-project/go-address" "github.com/filecoin-project/go-state-types/crypto" lcli "github.com/filecoin-project/lotus/cli" "github.com/filecoin-project/lotus/lib/sigs" ) var signaturesCmd = &cli.Command{ Name: "signatures", Usage: "tools involving signatures", Subcommands: []*cli.Command{ sigsVerifyVoteCmd, sigsVerifyBlsMsgsCmd, }, } var sigsVerifyBlsMsgsCmd = &cli.Command{ Name: "verify-bls", Description: "given a block, verifies the bls signature of the messages in the block", Usage: "", Action: func(cctx *cli.Context) error { if cctx.NArg() != 1 { return lcli.IncorrectNumArgs(cctx) } api, closer, err := lcli.GetFullNodeAPI(cctx) if err != nil { return err } defer closer() ctx := lcli.ReqContext(cctx) bc, err := cid.Decode(cctx.Args().First()) if err != nil { return err } b, err := api.ChainGetBlock(ctx, bc) if err != nil { return err } ms, err := api.ChainGetBlockMessages(ctx, bc) if err != nil { return err } var sigCids []cid.Cid // this is what we get for people not wanting the marshalcbor method on the cid type var pubks [][]byte for _, m := range ms.BlsMessages { sigCids = append(sigCids, m.Cid()) if m.From.Protocol() != address.BLS { return xerrors.Errorf("address must be BLS address") } pubks = append(pubks, m.From.Payload()) } msgsS := make([]ffi.Message, len(sigCids)) pubksS := make([]ffi.PublicKey, len(sigCids)) for i := 0; i < len(sigCids); i++ { msgsS[i] = sigCids[i].Bytes() copy(pubksS[i][:], pubks[i][:ffi.PublicKeyBytes]) } sigS := new(ffi.Signature) copy(sigS[:], b.BLSAggregate.Data[:ffi.SignatureBytes]) if len(sigCids) == 0 { return nil } valid := ffi.HashVerify(sigS, msgsS, pubksS) if !valid { return xerrors.New("bls aggregate signature failed to verify") } fmt.Println("BLS siggys valid!") return nil }, } var sigsVerifyVoteCmd = &cli.Command{ Name: "verify-vote", Description: "can be used to verify signed votes being submitted for FILPolls", Usage: " ", Action: func(cctx *cli.Context) error { if cctx.NArg() != 3 { return lcli.IncorrectNumArgs(cctx) } fip, err := strconv.ParseInt(cctx.Args().First(), 10, 64) if err != nil { return xerrors.Errorf("couldn't parse FIP number: %w", err) } addr, err := address.NewFromString(cctx.Args().Get(1)) if err != nil { return xerrors.Errorf("couldn't parse signing address: %w", err) } sigBytes, err := hex.DecodeString(cctx.Args().Get(2)) if err != nil { return xerrors.Errorf("couldn't parse sig: %w", err) } var sig crypto.Signature if err := sig.UnmarshalBinary(sigBytes); err != nil { return xerrors.Errorf("couldn't unmarshal sig: %w", err) } switch fip { case 14: approve := []byte("7 - Approve") if sigs.Verify(&sig, addr, approve) == nil { fmt.Println("valid vote for approving FIP-0014") return nil } reject := []byte("7 - Reject") if sigs.Verify(&sig, addr, reject) == nil { fmt.Println("valid vote for rejecting FIP-0014") return nil } return xerrors.Errorf("invalid vote for FIP-0014!") default: return xerrors.Errorf("unrecognized FIP number") } }, }