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main.go
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main.go
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package main
import (
"bytes"
"encoding/hex"
"encoding/pem"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"time"
logger "github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/core/pubkeyConverter"
"github.com/ElrondNetwork/elrond-go/crypto"
"github.com/ElrondNetwork/elrond-go/crypto/signing"
"github.com/ElrondNetwork/elrond-go/crypto/signing/ed25519"
"github.com/ElrondNetwork/elrond-go/crypto/signing/mcl"
"github.com/urfave/cli"
)
type cfg struct {
numKeys int
keyType string
consoleOut bool
noSplit bool
}
const validatorType = "validator"
const walletType = "wallet"
const bothType = "both"
type key struct {
skBytes []byte
pkBytes []byte
}
const keysFolderPattern = "node-%d"
const blsPubkeyLen = 96
const txSignPubkeyLen = 32
var (
fileGenHelpTemplate = `NAME:
{{.Name}} - {{.Usage}}
USAGE:
{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}
{{if len .Authors}}
AUTHOR:
{{range .Authors}}{{ . }}{{end}}
{{end}}{{if .Commands}}
GLOBAL OPTIONS:
{{range .VisibleFlags}}{{.}}
{{end}}
VERSION:
{{.Version}}
{{end}}
`
// numKeys defines a flag for setting how many keys should generate
numKeys = cli.IntFlag{
Name: "num-keys",
Usage: "How many keys should generate. Example: 1",
Value: 1,
Destination: &argsConfig.numKeys,
}
// keyType defines a flag for setting what keys should generate
keyType = cli.StringFlag{
Name: "key-type",
Usage: fmt.Sprintf(
"What king of keys should generate. Available options: %s, %s, %s",
validatorType,
walletType,
bothType),
Value: "validator",
Destination: &argsConfig.keyType,
}
// consoleOut is the flag that, if active, will print everything on the console, not on a physical file
consoleOut = cli.BoolFlag{
Name: "console-out",
Usage: "Boolean option that will enable printing the generated keys directly on the console",
Destination: &argsConfig.consoleOut,
}
// noSplit is the flag that, if active, will generate the keys in the same file
noSplit = cli.BoolFlag{
Name: "no-split",
Usage: "Boolean option that will make each generated key added in the same file",
Destination: &argsConfig.noSplit,
}
argsConfig = &cfg{}
walletKeyFilenameTemplate = "walletKey%s.pem"
validatorKeyFilenameTemplate = "validatorKey%s.pem"
log = logger.GetOrCreate("keygenerator")
validatorPubKeyConverter, _ = pubkeyConverter.NewHexPubkeyConverter(blsPubkeyLen)
walletPubKeyConverter, _ = pubkeyConverter.NewBech32PubkeyConverter(txSignPubkeyLen)
)
func main() {
app := cli.NewApp()
cli.AppHelpTemplate = fileGenHelpTemplate
app.Name = "Key generation Tool"
app.Version = "v1.0.0"
app.Usage = "This binary will generate a validatorKey.pem and walletKey.pem, each containing private key(s)"
app.Authors = []cli.Author{
{
Name: "The Elrond Team",
Email: "contact@elrond.com",
},
}
app.Flags = []cli.Flag{
numKeys,
keyType,
consoleOut,
noSplit,
}
app.Action = func(_ *cli.Context) error {
return process()
}
err := app.Run(os.Args)
if err != nil {
log.Error("error generating files", "error", err)
os.Exit(1)
}
}
func process() error {
validatorKeys, walletKeys, err := generateKeys(argsConfig.keyType, argsConfig.numKeys)
if err != nil {
return err
}
return outputKeys(validatorKeys, walletKeys, argsConfig.consoleOut, argsConfig.noSplit)
}
func generateKeys(typeKey string, numKeys int) ([]key, []key, error) {
if numKeys < 1 {
return nil, nil, fmt.Errorf("number of keys should be a number greater or equal to 1")
}
validatorKeys := make([]key, 0)
walletKeys := make([]key, 0)
var err error
blockSigningGenerator := signing.NewKeyGenerator(mcl.NewSuiteBLS12())
txSigningGenerator := signing.NewKeyGenerator(ed25519.NewEd25519())
for i := 0; i < numKeys; i++ {
switch typeKey {
case validatorType:
validatorKeys, err = generateKey(blockSigningGenerator, validatorKeys)
if err != nil {
return nil, nil, err
}
case walletType:
walletKeys, err = generateKey(txSigningGenerator, walletKeys)
if err != nil {
return nil, nil, err
}
case bothType:
validatorKeys, err = generateKey(blockSigningGenerator, validatorKeys)
if err != nil {
return nil, nil, err
}
walletKeys, err = generateKey(txSigningGenerator, walletKeys)
if err != nil {
return nil, nil, err
}
default:
return nil, nil, fmt.Errorf("unknown key type %s", argsConfig.keyType)
}
}
return validatorKeys, walletKeys, nil
}
func generateKey(keyGen crypto.KeyGenerator, list []key) ([]key, error) {
sk, pk := keyGen.GeneratePair()
skBytes, err := sk.ToByteArray()
if err != nil {
return nil, err
}
pkBytes, err := pk.ToByteArray()
if err != nil {
return nil, err
}
list = append(
list,
key{
skBytes: skBytes,
pkBytes: pkBytes,
},
)
return list, nil
}
func outputKeys(
validatorKeys []key,
walletKeys []key,
consoleOut bool,
noSplit bool,
) error {
if consoleOut {
return printKeys(validatorKeys, walletKeys)
}
return saveKeys(validatorKeys, walletKeys, noSplit)
}
func printKeys(validatorKeys []key, walletKeys []key) error {
if len(validatorKeys)+len(walletKeys) == 0 {
return fmt.Errorf("internal error: no keys to print")
}
var errFound error
if len(validatorKeys) > 0 {
err := printSliceKeys("Validator keys:", validatorKeys, validatorPubKeyConverter)
if err != nil {
errFound = err
}
}
if len(walletKeys) > 0 {
err := printSliceKeys("Wallet keys:", walletKeys, walletPubKeyConverter)
if err != nil {
errFound = err
}
}
return errFound
}
func printSliceKeys(message string, sliceKeys []key, converter core.PubkeyConverter) error {
data := []string{message + "\n"}
for _, k := range sliceKeys {
buf := bytes.NewBuffer(make([]byte, 0))
err := writeKeyToStream(buf, k, converter)
if err != nil {
return err
}
data = append(data, buf.String())
}
log.Info(strings.Join(data, ""))
return nil
}
func writeKeyToStream(writer io.Writer, key key, pubkeyConverter core.PubkeyConverter) error {
if check.IfNilReflect(writer) {
return fmt.Errorf("nil writer")
}
pkString := pubkeyConverter.Encode(key.pkBytes)
blk := pem.Block{
Type: "PRIVATE KEY for " + pkString,
Bytes: []byte(hex.EncodeToString(key.skBytes)),
}
return pem.Encode(writer, &blk)
}
func saveKeys(validatorKeys []key, walletKeys []key, noSplit bool) error {
if len(validatorKeys)+len(walletKeys) == 0 {
return fmt.Errorf("internal error: no keys to save")
}
var errFound error
if len(validatorKeys) > 0 {
err := saveSliceKeys(validatorKeyFilenameTemplate, validatorKeys, validatorPubKeyConverter, noSplit)
if err != nil {
errFound = err
}
}
if len(walletKeys) > 0 {
err := saveSliceKeys(walletKeyFilenameTemplate, walletKeys, walletPubKeyConverter, noSplit)
if err != nil {
errFound = err
}
}
return errFound
}
func saveSliceKeys(baseFilenameTemplate string, keys []key, pubkeyConverter core.PubkeyConverter, noSplit bool) error {
var file *os.File
var err error
for i, k := range keys {
shouldCreateFile := !noSplit || i == 0
if shouldCreateFile {
file, err = generateFile(i, len(keys), noSplit, baseFilenameTemplate)
if err != nil {
return err
}
}
err = writeKeyToStream(file, k, pubkeyConverter)
if err != nil {
return err
}
if !noSplit {
err = file.Close()
if err != nil {
return err
}
}
}
if noSplit {
return file.Close()
}
return nil
}
func generateFile(index int, numKeys int, noSplit bool, baseFilenameTemplate string) (*os.File, error) {
folder, err := generateFolder(index, numKeys, noSplit)
if err != nil {
return nil, err
}
filename := filepath.Join(folder, baseFilenameTemplate)
backupFileIfExists(filename)
//replace the %s with empty string
filename = fmt.Sprintf(filename, "")
err = os.Remove(filename)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
return os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, core.FileModeUserReadWrite)
}
func generateFolder(index int, numKeys int, noSplit bool) (string, error) {
absPath, err := os.Getwd()
if err != nil {
return "", err
}
shouldCreateDirectory := numKeys > 1 && !noSplit
if shouldCreateDirectory {
absPath = filepath.Join(absPath, fmt.Sprintf(keysFolderPattern, index))
}
log.Info("generating files in", "folder", absPath)
err = os.MkdirAll(absPath, os.ModePerm)
if err != nil {
return "", err
}
return absPath, nil
}
func backupFileIfExists(filenameTemplate string) {
existingFilename := fmt.Sprintf(filenameTemplate, "")
if _, err := os.Stat(existingFilename); err != nil {
if os.IsNotExist(err) {
return
}
}
//if we reached here the file probably exists, make a timestamped backup
_ = os.Rename(existingFilename, fmt.Sprintf(filenameTemplate, fmt.Sprintf("_%d", time.Now().Unix())))
}