[#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/parser.go

@@ -0,0 +1,118 @@
+package keyer
+
+import (
+	"crypto/elliptic"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/mr-tron/base58"
+	"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/util"
+)
+
+const (
+	NeoPrivateKeySize = 32
+
+	scriptHashSize            = 20
+	addressSize               = 25
+	publicKeyCompressedSize   = 33
+	wifSize                   = 38
+	publicKeyUncompressedSize = 65
+)
+
+var errInputType = errors.New("unknown input type")
+
+func (d *Dashboard) ParseString(data string) error {
+	// just in case remove 0x prefixes if there are some
+	data = strings.TrimPrefix(data, "0x")
+	data = strings.TrimPrefix(data, "0X")
+
+	var (
+		rawData []byte
+		err     error
+	)
+
+	// data could be encoded in base58 or hex formats, try both
+	rawData, err = base58.Decode(data)
+	if err != nil {
+		rawData, err = hex.DecodeString(data)
+		if err != nil {
+			return fmt.Errorf("data is not hex or base58 encoded: %w", err)
+		}
+	}
+
+	return d.ParseBinary(rawData)
+}
+
+func (d *Dashboard) ParseBinary(data []byte) error {
+	var err error
+
+	switch len(data) {
+	case NeoPrivateKeySize:
+		d.privKey, err = keys.NewPrivateKeyFromBytes(data)
+		if err != nil {
+			return fmt.Errorf("can't parse private key: %w", err)
+		}
+	case wifSize:
+		d.privKey, err = keys.NewPrivateKeyFromWIF(base58.Encode(data))
+		if err != nil {
+			return fmt.Errorf("can't parse WIF: %w", err)
+		}
+	case publicKeyCompressedSize, publicKeyUncompressedSize:
+		d.pubKey, err = keys.NewPublicKeyFromBytes(data, elliptic.P256())
+		if err != nil {
+			return fmt.Errorf("can't parse public key: %w", err)
+		}
+	case addressSize:
+		d.scriptHash3, err = address.StringToUint160(base58.Encode(data))
+		if err != nil {
+			return fmt.Errorf("can't parse address: %w", err)
+		}
+	case scriptHashSize:
+		sc, err := util.Uint160DecodeBytesLE(data)
+		if err != nil {
+			return fmt.Errorf("can't parse script hash: %w", err)
+		}
+
+		d.scriptHash3 = sc
+	default:
+		return errInputType
+	}
+
+	d.fill()
+
+	return nil
+}
+
+func (d *Dashboard) ParseMultiSig(data []string) error {
+	d.multisigKeys = make(keys.PublicKeys, 0, len(data))
+
+	for i := range data {
+		data, err := hex.DecodeString(data[i])
+		if err != nil {
+			return fmt.Errorf("pass only hex encoded public keys: %w", err)
+		}
+
+		key, err := keys.NewPublicKeyFromBytes(data, elliptic.P256())
+		if err != nil {
+			return fmt.Errorf("pass only hex encoded public keys: %w", err)
+		}
+
+		d.multisigKeys = append(d.multisigKeys, key)
+	}
+
+	return nil
+}
+
+func (d *Dashboard) fill() {
+	if d.privKey != nil {
+		d.pubKey = d.privKey.PublicKey()
+	}
+
+	if d.pubKey != nil {
+		d.scriptHash3 = d.pubKey.GetScriptHash()
+	}
+}