[#562] cmd/neofs-node: use NEP-6 wallet for keys

Also use neo-go private key wrapper where possible, as it
already has methods for (un)marshaling.

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

cmd/neofs-node/config/node/config.go

@@ -5,8 +5,10 @@ import (
 	"fmt"
 	"strconv"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
 	"github.com/nspcc-dev/neofs-node/pkg/network"
+	utilConfig "github.com/nspcc-dev/neofs-node/pkg/util/config"
 )
 
 const (
@@ -36,6 +38,20 @@ func Key(c *config.Config) string {
 	return v
 }
 
+// Wallet returns value of node private key from "node" section.
+func Wallet(c *config.Config) *keys.PrivateKey {
+	v := c.Sub(subsection).Sub("wallet")
+	acc, err := utilConfig.LoadAccount(
+		config.String(v, "path"),
+		config.String(v, "address"),
+		config.String(v, "password"))
+	if err != nil {
+		panic(fmt.Errorf("invalid wallet config: %w", err))
+	}
+
+	return acc.PrivateKey()
+}
+
 // BootstrapAddress returns value of "address" config parameter
 // from "node" section as network.Address.
 //

cmd/neofs-node/config/node/config_test.go

@@ -3,6 +3,7 @@ package nodeconfig
 import (
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
 	configtest "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/test"
 	"github.com/nspcc-dev/neofs-node/pkg/network"
@@ -43,6 +44,7 @@ func TestNodeSection(t *testing.T) {
 		addr := BootstrapAddress(c)
 		attributes := Attributes(c)
 		relay := Relay(c)
+		wKey := Wallet(c)
 
 		expectedAddr, err := network.AddressFromString("s01.neofs.devenv:8080")
 		require.NoError(t, err)
@@ -54,6 +56,11 @@ func TestNodeSection(t *testing.T) {
 		require.Len(t, attributes, 2)
 		require.Equal(t, "Price:11", attributes[0])
 		require.Equal(t, "UN-LOCODE:RU MSK", attributes[1])
+
+		require.NotNil(t, wKey)
+		require.Equal(t,
+			config.StringSafe(c.Sub("node").Sub("wallet"), "address"),
+			address.Uint160ToString(wKey.GetScriptHash()))
 	}
 
 	configtest.ForEachFileType(path, fileConfigTest)

cmd/neofs-node/config/node/wallet.json

@@ -0,0 +1,30 @@
+{
+  "version": "3.0",
+  "accounts": [
+    {
+      "address": "NcpJzXcSDrh5CCizf4K9Ro6w4t59J5LKzz",
+      "key": "6PYXFRFUfoMNjWd2UmaaEjwHSWpifcLLTbEfhkwXdiSZ2n2WLfr75JpxmJ",
+      "label": "testacc",
+      "contract": {
+        "script": "DCECaeaVhKFa+ENNUpRJLz6BRmRbkIaoN+xZt3VHzlzkHJZBVuezJw==",
+        "parameters": [
+          {
+            "name": "parameter0",
+            "type": "Signature"
+          }
+        ],
+        "deployed": false
+      },
+      "lock": false,
+      "isDefault": false
+    }
+  ],
+  "scrypt": {
+    "n": 16384,
+    "r": 8,
+    "p": 8
+  },
+  "extra": {
+    "Tokens": null
+  }
+}