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main.go
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main.go
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package main
import (
"encoding/hex"
"fmt"
"os"
"path/filepath"
"time"
logger "github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/config"
"github.com/ElrondNetwork/elrond-go/core"
"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/ElrondNetwork/elrond-go/data/state"
"github.com/ElrondNetwork/elrond-go/data/state/factory"
"github.com/urfave/cli"
)
type cfg struct {
numKeys int
keyType string
}
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: "What king of keys should generate. Available options: block, tx, both",
Value: "both",
Destination: &argsConfig.keyType,
}
argsConfig = &cfg{}
initialBalancesSkFileName = "initialBalancesSk.pem"
initialNodesSkFileName = "initialNodesSk.pem"
log = logger.GetOrCreate("keygenerator")
)
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 initialBalancesSk.pem and initialNodesSk.pem, each containing one private key"
app.Authors = []cli.Author{
{
Name: "The Elrond Team",
Email: "contact@elrond.com",
},
}
app.Flags = []cli.Flag{
numKeys,
keyType,
}
app.Action = func(_ *cli.Context) error {
return generateAllFiles()
}
err := app.Run(os.Args)
if err != nil {
log.Error("error generating files", "error", err)
os.Exit(1)
}
}
func generateFolder(index int, numKeys int) (string, error) {
absPath, err := os.Getwd()
if err != nil {
return "", err
}
if numKeys > 1 {
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 generateKeys(keyGen crypto.KeyGenerator) ([]byte, []byte, error) {
sk, pk := keyGen.GeneratePair()
skBytes, err := sk.ToByteArray()
if err != nil {
return nil, nil, err
}
pkBytes, err := pk.ToByteArray()
if err != nil {
return nil, nil, err
}
return skBytes, pkBytes, nil
}
func backupFileIfExists(filename string) {
if _, err := os.Stat(filename); err != nil {
if os.IsNotExist(err) {
return
}
}
//if we reached here the file probably exists, make a timestamped backup
_ = os.Rename(filename, filename+"."+fmt.Sprintf("%d", time.Now().Unix()))
}
func generateAllFiles() error {
for i := 0; i < argsConfig.numKeys; i++ {
err := generateOneSetOfFiles(i, argsConfig.numKeys)
if err != nil {
return err
}
}
return nil
}
func generateOneSetOfFiles(index int, numKeys int) error {
switch argsConfig.keyType {
case "block":
return generateBlockKey(index, numKeys)
case "tx":
return generateTxKey(index, numKeys)
case "both":
err := generateBlockKey(index, numKeys)
if err != nil {
return err
}
return generateTxKey(index, numKeys)
default:
return fmt.Errorf("unknown key type %s", argsConfig.keyType)
}
}
func generateBlockKey(index int, numKeys int) error {
pubkeyConverter, err := factory.NewPubkeyConverter(
config.PubkeyConfig{
Length: blsPubkeyLen,
Type: factory.HexFormat,
},
)
if err != nil {
return err
}
genForBlockSigningSk := signing.NewKeyGenerator(mcl.NewSuiteBLS12())
return generateAndSave(index, numKeys, initialNodesSkFileName, genForBlockSigningSk, pubkeyConverter)
}
func generateTxKey(index int, numKeys int) error {
pubkeyConverter, err := factory.NewPubkeyConverter(
config.PubkeyConfig{
Length: txSignPubkeyLen,
Type: factory.Bech32Format,
},
)
if err != nil {
return err
}
genForBlockSigningSk := signing.NewKeyGenerator(ed25519.NewEd25519())
return generateAndSave(index, numKeys, initialBalancesSkFileName, genForBlockSigningSk, pubkeyConverter)
}
func generateAndSave(index int, numKeys int, baseFilename string, genForBlockSigningSk crypto.KeyGenerator, pubkeyConverter state.PubkeyConverter) error {
folder, err := generateFolder(index, numKeys)
if err != nil {
return err
}
filename := filepath.Join(folder, baseFilename)
backupFileIfExists(filename)
err = os.Remove(filename)
if err != nil && !os.IsNotExist(err) {
return err
}
file, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, core.FileModeUserReadWrite)
if err != nil {
return err
}
defer func() {
_ = file.Close()
}()
sk, pk, err := generateKeys(genForBlockSigningSk)
if err != nil {
return err
}
pkString := pubkeyConverter.Encode(pk)
return core.SaveSkToPemFile(file, pkString, []byte(hex.EncodeToString(sk)))
}