package consensus import ( "golang.org/x/xerrors" "github.com/filecoin-project/go-address" "github.com/filecoin-project/go-state-types/crypto" "github.com/filecoin-project/go-state-types/network" "github.com/filecoin-project/lotus/chain/types" "github.com/filecoin-project/lotus/chain/types/ethtypes" "github.com/filecoin-project/lotus/lib/sigs" ) // AuthenticateMessage authenticates the message by verifying that the supplied // SignedMessage was signed by the indicated Address, computing the correct // signature payload depending on the signature type. The supplied Address type // must be recognized by the registered verifier for the signature type. func AuthenticateMessage(msg *types.SignedMessage, signer address.Address) error { var digest []byte typ := msg.Signature.Type switch typ { case crypto.SigTypeDelegated: txArgs, err := ethtypes.EthTxArgsFromMessage(&msg.Message) if err != nil { return xerrors.Errorf("failed to reconstruct eth transaction: %w", err) } roundTripMsg, err := txArgs.ToUnsignedMessage(msg.Message.From) if err != nil { return xerrors.Errorf("failed to reconstruct filecoin msg: %w", err) } if !msg.Message.Equals(roundTripMsg) { return xerrors.New("ethereum tx failed to roundtrip") } rlpEncodedMsg, err := txArgs.ToRlpUnsignedMsg() if err != nil { return xerrors.Errorf("failed to repack eth rlp message: %w", err) } digest = rlpEncodedMsg default: digest = msg.Message.Cid().Bytes() } if err := sigs.Verify(&msg.Signature, signer, digest); err != nil { return xerrors.Errorf("message %s has invalid signature (type %d): %w", msg.Cid(), typ, err) } return nil } // IsValidSecpkSigType checks that a signature type is valid for the network // version, for a "secpk" message. func IsValidSecpkSigType(nv network.Version, typ crypto.SigType) bool { switch { case nv < network.Version18: return typ == crypto.SigTypeSecp256k1 default: return typ == crypto.SigTypeSecp256k1 || typ == crypto.SigTypeDelegated } }