/
file.go
121 lines (104 loc) · 2.35 KB
/
file.go
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package keyring
import (
"errors"
"fmt"
"io/ioutil"
"os"
"github.com/libp2p/go-libp2p-core/crypto"
)
// InMemory lets us configure keys for testing that live in memory and
// get thrown out once we're done with them
const InMemory = ":memory:"
func restore(kr *KeyRing, uri, path string) error {
cpriv, cpub, err := getKeys(path)
if err != nil {
return err
}
pub, err := MemberPublicKeyFromP2PKey(cpub)
if err != nil {
return err
}
priv, err := MemberPrivateKeyFromP2PKey(cpriv)
if err != nil {
return err
}
id, err := MemberIDFromP2PPubKey(cpub)
if err != nil {
return err
}
kr.identity = cpriv
kr.AddKeyPair(uri, id, pub, priv)
return nil
}
// getKeys returns a public/private keypair from the path on disk, or
// creates one at that path if one does not exist
func getKeys(path string) (crypto.PrivKey, crypto.PubKey, error) {
if path == InMemory {
return generateKey()
}
priv, err := loadKey(path)
if err == nil {
pub := priv.GetPublic()
return priv, pub, nil
}
if !errors.Is(err, os.ErrNotExist) {
return nil, nil, err
}
// first time we started this vault, create and save a new key
priv, pub, err := generateKey()
if err != nil {
return nil, nil, err
}
err = saveKey(priv, path)
if err != nil {
return nil, nil, err
}
return priv, pub, nil
}
func loadKey(path string) (crypto.PrivKey, error) {
b, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return decodeKey(string(b))
}
func saveKey(key crypto.PrivKey, path string) error {
s, err := encodeKey(key)
if err != nil {
return err
}
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0400)
if err != nil {
return err
}
defer f.Close()
wrote, err := f.WriteString(s)
if err != nil {
return fmt.Errorf("could not write key: %w", err)
}
if wrote != len(s) {
return fmt.Errorf("partial write of key")
}
return nil
}
func encodeKey(key crypto.PrivKey) (string, error) {
b, err := crypto.MarshalPrivateKey(key)
if err != nil {
return "", err
}
return crypto.ConfigEncodeKey(b), nil
}
func decodeKey(encoded string) (crypto.PrivKey, error) {
b, err := crypto.ConfigDecodeKey(encoded)
if err != nil {
return nil, err
}
key, err := crypto.UnmarshalPrivateKey(b)
if err != nil {
return nil, err
}
return key, nil
}
func generateKey() (crypto.PrivKey, crypto.PubKey, error) {
return crypto.GenerateKeyPair(crypto.Ed25519, -1)
}