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signatures.go
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signatures.go
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package main
import (
"encoding/hex"
"fmt"
"strconv"
ffi "github.com/filecoin-project/filecoin-ffi"
lcli "github.com/filecoin-project/lotus/cli"
"github.com/ipfs/go-cid"
"github.com/filecoin-project/go-state-types/crypto"
"github.com/filecoin-project/lotus/lib/sigs"
"github.com/filecoin-project/go-address"
"github.com/urfave/cli/v2"
"golang.org/x/xerrors"
)
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: "<blockCid>",
Action: func(cctx *cli.Context) error {
if cctx.Args().Len() != 1 {
return xerrors.Errorf("usage: <blockCid>")
}
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: "<FIPnumber> <signingAddress> <signature>",
Action: func(cctx *cli.Context) error {
if cctx.Args().Len() != 3 {
return xerrors.Errorf("usage: verify-vote <FIPnumber> <signingAddress> <signature>")
}
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")
}
},
}