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lnd+walletunlocker: allow creating wallet from extended key

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In addition to creating a new wallet from an aezeed, we allow specifying
an exteded master root key as the main wallet key directly.
Because an exteded key (xprv) doesn't contain any information about the
creation time of the wallet, we must assume a birthday to start scanning
the chain from (if the user doesn't provide an explicit value). Since
lnd only uses SegWit addresses, it makes sense to
choose the date that corresponds to the first mainnet block that
contained SegWit transactions.
Restoring a wallet from an extended master root key will result in a
significantly longer initial wallet rescan time if the default value is
used.
This commit is contained in:
Oliver Gugger
2020-10-24 23:18:50 +02:00
parent 6d70468ad5
commit aa9435be84
2 changed files with 138 additions and 22 deletions
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38
lnd.go
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@@ -1492,13 +1492,17 @@ func waitForWalletPassword(cfg *Config,
case initMsg := <-pwService.InitMsgs:
password := initMsg.Passphrase
cipherSeed := initMsg.WalletSeed
extendedKey := initMsg.WalletExtendedKey
recoveryWindow := initMsg.RecoveryWindow
// Before we proceed, we'll check the internal version of the
// seed. If it's greater than the current key derivation
// version, then we'll return an error as we don't understand
// this.
if cipherSeed.InternalVersion != keychain.KeyDerivationVersion {
const latestVersion = keychain.KeyDerivationVersion
if cipherSeed != nil &&
cipherSeed.InternalVersion != latestVersion {
return nil, fmt.Errorf("invalid internal "+
"seed version %v, current version is %v",
cipherSeed.InternalVersion,
@@ -1515,10 +1519,36 @@ func waitForWalletPassword(cfg *Config,
// With the seed, we can now use the wallet loader to create
// the wallet, then pass it back to avoid unlocking it again.
birthday := cipherSeed.BirthdayTime()
newWallet, err := loader.CreateNewWallet(
password, password, cipherSeed.Entropy[:], birthday,
var (
birthday time.Time
newWallet *wallet.Wallet
)
switch {
// A normal cipher seed was given, use the birthday encoded in
// it and create the wallet from that.
case cipherSeed != nil:
birthday = cipherSeed.BirthdayTime()
newWallet, err = loader.CreateNewWallet(
password, password, cipherSeed.Entropy[:],
birthday,
)
// No seed was given, we're importing a wallet from its extended
// private key.
case extendedKey != nil:
birthday = initMsg.ExtendedKeyBirthday
newWallet, err = loader.CreateNewWalletExtendedKey(
password, password, extendedKey, birthday,
)
default:
// The unlocker service made sure either the cipher seed
// or the extended key is set so, we shouldn't get here.
// The default case is just here for readability and
// completeness.
err = fmt.Errorf("cannot create wallet, neither seed " +
"nor extended key was given")
}
if err != nil {
// Don't leave the file open in case the new wallet
// could not be created for whatever reason.