// NodeKey retrieves the currently configured private key of the node, checking
// first any manually set key, falling back to the one found in the configured
// data folder. If no key can be found, a new one is generated.
func (c *Config) NodeKey() *ecdsa.PrivateKey {
// Use any specifically configured key
if c.PrivateKey != nil {
return c.PrivateKey
}
// Generate ephemeral key if no datadir is being used
if c.DataDir == "" {
key, err := crypto.GenerateKey()
if err != nil {
glog.Fatalf("Failed to generate ephemeral node key: %v", err)
}
return key
}
// Fall back to persistent key from the data directory
keyfile := filepath.Join(c.DataDir, datadirPrivateKey)
if key, err := crypto.LoadECDSA(keyfile); err == nil {
return key
}
// No persistent key found, generate and store a new one
key, err := crypto.GenerateKey()
if err != nil {
glog.Fatalf("Failed to generate node key: %v", err)
}
if err := crypto.SaveECDSA(keyfile, key); err != nil {
glog.V(logger.Error).Infof("Failed to persist node key: %v", err)
}
return key
}
// USE WITH CAUTION = this will save an unencrypted private key on disk
// no cli or js interface
func (am *Manager) Export(path string, addr common.Address, keyAuth string) error {
key, err := am.keyStore.GetKey(addr, keyAuth)
if err != nil {
return err
}
return crypto.SaveECDSA(path, key.PrivateKey)
}
func main() {
var (
listenAddr = flag.String("addr", ":42787", "listen address")
genKey = flag.String("genkey", "", "generate a node key and quit")
nodeKeyFile = flag.String("nodekey", "", "private key filename")
nodeKeyHex = flag.String("nodekeyhex", "", "private key as hex (for testing)")
natdesc = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
nodeKey *ecdsa.PrivateKey
err error
)
flag.Var(glog.GetVerbosity(), "verbosity", "log verbosity (0-9)")
flag.Var(glog.GetVModule(), "vmodule", "log verbosity pattern")
glog.SetToStderr(true)
flag.Parse()
if *genKey != "" {
key, err := crypto.GenerateKey()
if err != nil {
utils.Fatalf("could not generate key: %v", err)
}
if err := crypto.SaveECDSA(*genKey, key); err != nil {
utils.Fatalf("%v", err)
}
os.Exit(0)
}
natm, err := nat.Parse(*natdesc)
if err != nil {
utils.Fatalf("-nat: %v", err)
}
switch {
case *nodeKeyFile == "" && *nodeKeyHex == "":
utils.Fatalf("Use -nodekey or -nodekeyhex to specify a private key")
case *nodeKeyFile != "" && *nodeKeyHex != "":
utils.Fatalf("Options -nodekey and -nodekeyhex are mutually exclusive")
case *nodeKeyFile != "":
if nodeKey, err = crypto.LoadECDSA(*nodeKeyFile); err != nil {
utils.Fatalf("-nodekey: %v", err)
}
case *nodeKeyHex != "":
if nodeKey, err = crypto.HexToECDSA(*nodeKeyHex); err != nil {
utils.Fatalf("-nodekeyhex: %v", err)
}
}
if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
utils.Fatalf("%v", err)
}
select {}
}
func (cfg *Config) nodeKey() (*ecdsa.PrivateKey, error) {
// use explicit key from command line args if set
if cfg.NodeKey != nil {
return cfg.NodeKey, nil
}
// use persistent key if present
keyfile := filepath.Join(cfg.DataDir, "nodekey")
key, err := crypto.LoadECDSA(keyfile)
if err == nil {
return key, nil
}
// no persistent key, generate and store a new one
if key, err = crypto.GenerateKey(); err != nil {
return nil, fmt.Errorf("could not generate server key: %v", err)
}
if err := crypto.SaveECDSA(keyfile, key); err != nil {
glog.V(logger.Error).Infoln("could not persist nodekey: ", err)
}
return key, nil
}