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utils.go
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utils.go
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package p2p
import (
"crypto/ecdsa"
"crypto/rand"
"encoding/hex"
"io/ioutil"
"net"
"os"
"path"
"github.com/btcsuite/btcd/btcec"
"github.com/libp2p/go-libp2p-core/crypto"
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/shared/iputils"
)
const keyPath = "network-keys"
func convertFromInterfacePrivKey(privkey crypto.PrivKey) *ecdsa.PrivateKey {
typeAssertedKey := (*ecdsa.PrivateKey)((*btcec.PrivateKey)(privkey.(*crypto.Secp256k1PrivateKey)))
return typeAssertedKey
}
func convertToInterfacePrivkey(privkey *ecdsa.PrivateKey) crypto.PrivKey {
typeAssertedKey := crypto.PrivKey((*crypto.Secp256k1PrivateKey)((*btcec.PrivateKey)(privkey)))
return typeAssertedKey
}
func convertToInterfacePubkey(pubkey *ecdsa.PublicKey) crypto.PubKey {
typeAssertedKey := crypto.PubKey((*crypto.Secp256k1PublicKey)((*btcec.PublicKey)(pubkey)))
return typeAssertedKey
}
func privKey(cfg *Config) (*ecdsa.PrivateKey, error) {
defaultKeyPath := path.Join(cfg.DataDir, keyPath)
privateKeyPath := cfg.PrivateKey
_, err := os.Stat(defaultKeyPath)
defaultKeysExist := !os.IsNotExist(err)
if err != nil && defaultKeysExist {
return nil, err
}
if privateKeyPath == "" && !defaultKeysExist {
priv, _, err := crypto.GenerateSecp256k1Key(rand.Reader)
if err != nil {
return nil, err
}
rawbytes, err := priv.Raw()
if err != nil {
return nil, err
}
dst := make([]byte, hex.EncodedLen(len(rawbytes)))
hex.Encode(dst, rawbytes)
if err = ioutil.WriteFile(defaultKeyPath, dst, 0600); err != nil {
return nil, err
}
convertedKey := convertFromInterfacePrivKey(priv)
return convertedKey, nil
}
if defaultKeysExist && privateKeyPath == "" {
privateKeyPath = defaultKeyPath
}
return retrievePrivKeyFromFile(privateKeyPath)
}
func retrievePrivKeyFromFile(path string) (*ecdsa.PrivateKey, error) {
src, err := ioutil.ReadFile(path)
if err != nil {
log.WithError(err).Error("Error reading private key from file")
return nil, err
}
dst := make([]byte, hex.DecodedLen(len(src)))
_, err = hex.Decode(dst, src)
if err != nil {
return nil, errors.Wrap(err, "failed to decode hex string")
}
unmarshalledKey, err := crypto.UnmarshalSecp256k1PrivateKey(dst)
if err != nil {
return nil, err
}
return convertFromInterfacePrivKey(unmarshalledKey), nil
}
func ipAddr() net.IP {
ip, err := iputils.ExternalIPv4()
if err != nil {
log.Fatalf("Could not get IPv4 address: %v", err)
}
return net.ParseIP(ip)
}