[#1381] neofs-cli: Move control command to a separate module

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

cmd/neofs-cli/modules/control/util.go

@@ -0,0 +1,62 @@
+package control
+
+import (
+	"crypto/ecdsa"
+	"errors"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+	internalclient "github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/client"
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/common"
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/key"
+	controlSvc "github.com/nspcc-dev/neofs-node/pkg/services/control/server"
+	"github.com/nspcc-dev/neofs-sdk-go/client"
+	neofscrypto "github.com/nspcc-dev/neofs-sdk-go/crypto"
+	"github.com/spf13/cobra"
+)
+
+func signRequest(cmd *cobra.Command, pk *ecdsa.PrivateKey, req controlSvc.SignedMessage) {
+	err := controlSvc.SignMessage(pk, req)
+	common.ExitOnErr(cmd, "could not sign request: %w", err)
+}
+
+func verifyResponse(cmd *cobra.Command,
+	sigControl interface {
+		GetKey() []byte
+		GetSign() []byte
+	},
+	body interface {
+		StableMarshal([]byte) ([]byte, error)
+	},
+) {
+	if sigControl == nil {
+		common.ExitOnErr(cmd, "", errors.New("missing response signature"))
+	}
+
+	bodyData, err := body.StableMarshal(nil)
+	common.ExitOnErr(cmd, "marshal response body: %w", err)
+
+	// TODO(@cthulhu-rider): #1387 use Signature message from NeoFS API to avoid conversion
+	var sigV2 refs.Signature
+	sigV2.SetScheme(refs.ECDSA_SHA512)
+	sigV2.SetKey(sigControl.GetKey())
+	sigV2.SetSign(sigControl.GetSign())
+
+	var sig neofscrypto.Signature
+	sig.ReadFromV2(sigV2)
+
+	if !sig.Verify(bodyData) {
+		common.ExitOnErr(cmd, "", errors.New("invalid response signature"))
+	}
+}
+
+func getClient(cmd *cobra.Command, pk *ecdsa.PrivateKey) *client.Client {
+	cli, err := internalclient.GetSDKClientByFlag(pk, controlRPC)
+	common.ExitOnErr(cmd, "", err)
+	return cli
+}
+
+func getKey(cmd *cobra.Command) *ecdsa.PrivateKey {
+	pk, err := key.Get()
+	common.ExitOnErr(cmd, "", err)
+	return pk
+}