[#159] Add keyer to neofs-cli

Keyer prints information about private key, public key,
NEO3 Wallet, scripthash. It can generate new private key
or generate multisig address.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/util/keyer/dashboard.go

@@ -0,0 +1,122 @@
+package keyer
+
+import (
+	"crypto/elliptic"
+	"encoding/hex"
+	"fmt"
+	"os"
+	"text/tabwriter"
+
+	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+)
+
+type (
+	Dashboard struct {
+		privKey     *keys.PrivateKey
+		pubKey      *keys.PublicKey
+		scriptHash3 util.Uint160
+
+		multisigKeys keys.PublicKeys
+	}
+)
+
+func (d Dashboard) PrettyPrint(uncompressed, useHex bool) {
+	var (
+		data []byte
+
+		privKey, pubKey, wif, wallet3, sh3, shBE3, multiSigAddr string
+	)
+
+	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)
+
+	if d.privKey != nil {
+		privKey = d.privKey.String()
+
+		wif = d.privKey.WIF()
+		if useHex {
+			wif = base58ToHex(wif)
+		}
+	}
+
+	if d.pubKey != nil {
+		if uncompressed {
+			data = elliptic.Marshal(elliptic.P256(), d.pubKey.X, d.pubKey.Y)
+		} else {
+			data = d.pubKey.Bytes()
+		}
+
+		pubKey = hex.EncodeToString(data)
+	}
+
+	if !d.scriptHash3.Equals(util.Uint160{}) {
+		sh3 = d.scriptHash3.StringLE()
+		shBE3 = d.scriptHash3.StringBE()
+		wallet3 = address.Uint160ToString(d.scriptHash3)
+
+		if useHex {
+			wallet3 = base58ToHex(wallet3)
+		}
+	}
+
+	if len(d.multisigKeys) != 0 {
+		u160, err := scriptHashFromMultikey(d.multisigKeys)
+		if err != nil {
+			panic("can't create multisig redeem script")
+		}
+
+		multiSigAddr = address.Uint160ToString(u160)
+	}
+
+	if privKey != "" {
+		fmt.Fprintf(w, "PrivateKey\t%s\n", privKey)
+	}
+
+	if pubKey != "" {
+		fmt.Fprintf(w, "PublicKey\t%s\n", pubKey)
+	}
+
+	if wif != "" {
+		fmt.Fprintf(w, "WIF\t%s\n", wif)
+	}
+
+	if wallet3 != "" {
+		fmt.Fprintf(w, "Wallet3.0\t%s\n", wallet3)
+	}
+
+	if sh3 != "" {
+		fmt.Fprintf(w, "ScriptHash3.0\t%s\n", sh3)
+	}
+
+	if shBE3 != "" {
+		fmt.Fprintf(w, "ScriptHash3.0BE\t%s\n", shBE3)
+	}
+
+	if multiSigAddr != "" {
+		fmt.Fprintf(w, "MultiSigAddress\t%s\n", multiSigAddr)
+	}
+
+	w.Flush()
+}
+
+func base58ToHex(data string) string {
+	val, err := base58.Decode(data)
+	if err != nil {
+		panic("produced incorrect base58 value")
+	}
+
+	return hex.EncodeToString(val)
+}
+
+func scriptHashFromMultikey(k keys.PublicKeys) (util.Uint160, error) {
+	script, err := smartcontract.CreateDefaultMultiSigRedeemScript(k)
+	if err != nil {
+		return util.Uint160{}, fmt.Errorf("can't create multisig redeem script: %w", err)
+	}
+
+	return hash.Hash160(script), nil
+}