add first implement.

crypto/secp256k1.go

+package crypto

main.go

+package main
+
+import (
+	"fmt"
+	"github.com/cmpchain/metacrypter/service"
+	"google.golang.org/grpc"
+	"net"
+)
+
+func main() {
+	lis, err := net.Listen("tcp", ":8970")
+	if err != nil {
+		fmt.Printf("failed to listen: %v", err)
+		return
+	}
+	s := grpc.NewServer()
+	service.RegisterCrypter(s)
+
+	err = s.Serve(lis)
+	if err != nil {
+		fmt.Printf("failed to serve: %v", err)
+		return
+	}
+}

service/service.go

+package service
+
+import (
+	"context"
+	metacrypter "github.com/cmpchain/metacrypter/pb/metacrypter/v1"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// hello server
+
+type CrypterServer struct {
+	metacrypter.UnimplementedCrypterServiceServer
+}
+
+func (*CrypterServer) Sign(ctx context.Context, req *metacrypter.SignRequest) (*metacrypter.SignResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Sign not implemented")
+}
+func (*CrypterServer) Verify(ctx context.Context, req *metacrypter.VerifyRequest) (*metacrypter.VerifyResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Verify not implemented")
+}
+func (*CrypterServer) Recover(ctx context.Context, req *metacrypter.RecoverRequest) (*metacrypter.RecoverResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Recover not implemented")
+}
+func (*CrypterServer) BatchSign(ctx context.Context, req *metacrypter.BatchSignRequest) (*metacrypter.BatchSignResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method BatchSign not implemented")
+}
+func (*CrypterServer) BatchVerify(ctx context.Context, req *metacrypter.BatchVerifyRequest) (*metacrypter.BatchVerifyResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method BatchVerify not implemented")
+}
+func (*CrypterServer) BatchRecover(ctx context.Context, req *metacrypter.BatchRecoverRequest) (*metacrypter.BatchRecoverResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method BatchRecover not implemented")
+}
+
+func RegisterCrypter(server *grpc.Server) {
+	metacrypter.RegisterCrypterServiceServer(server, &CrypterServer{})
+}