go-waku/cmd/waku/keygen/command.go

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package keygen
import (
"encoding/json"
"fmt"
"os"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/crypto"
"github.com/urfave/cli/v2"
"github.com/waku-org/go-waku/waku/v2/utils"
"go.uber.org/zap"
)
// Command generates a key file used to generate the node's peerID, encrypted with an optional password
var Command = cli.Command{
Name: "generate-key",
Usage: "Generate private key file at path specified in --key-file with the password defined by --key-password",
Action: func(cCtx *cli.Context) error {
if err := generateKeyFile(Options.KeyFile, []byte(Options.KeyPasswd), Options.Overwrite); err != nil {
utils.Logger().Fatal("could not write keyfile", zap.Error(err))
}
return nil
},
Flags: []cli.Flag{
KeyFile,
KeyPassword,
Overwrite,
},
}
func checkForFileExistence(path string, overwrite bool) error {
_, err := os.Stat(path)
if err == nil && !overwrite {
return fmt.Errorf("%s already exists. Use --overwrite to overwrite the file", path)
}
if err := os.Remove(path); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
func generatePrivateKey() ([]byte, error) {
key, err := crypto.GenerateKey()
if err != nil {
return nil, err
}
return key.D.Bytes(), nil
}
func writeKeyFile(path string, key []byte, passwd []byte) error {
encryptedK, err := keystore.EncryptDataV3(key, passwd, keystore.StandardScryptN, keystore.StandardScryptP)
if err != nil {
return err
}
output, err := json.Marshal(encryptedK)
if err != nil {
return err
}
return os.WriteFile(path, output, 0600)
}
func generateKeyFile(path string, passwd []byte, overwrite bool) error {
if err := checkForFileExistence(path, overwrite); err != nil {
return err
}
key, err := generatePrivateKey()
if err != nil {
return err
}
return writeKeyFile(path, key, passwd)
}