/**
* Work out which restore method to use, depending on if it is a Trezor wallet or not and what
* backups there are
*/
public void calculateRestoreMethod() {
Optional<HardwareWalletService> hardwareWalletService =
CoreServices.getOrCreateHardwareWalletService();
// User has selected restore wallet - see if wallet is hard Trezor wallet
// If so no need to enter a seed phrase - use the rootNode from the master public key to work
// out the wallet id
HardwareWalletContext context = hardwareWalletService.get().getContext();
// Create a wallet id from the rootNode to work out the wallet root directory
if (context.getDeterministicKey().isPresent()) {
walletId = Optional.of(new WalletId(context.getDeterministicKey().get().getIdentifier()));
String walletRoot = WalletManager.createWalletRoot(walletId.get());
log.debug("Hardware wallet root : {}", walletRoot);
}
// Ensure Trezor is cancelled
hardwareWalletService.get().requestCancel();
restoreMethod = RESTORE_WALLET_HARD_TREZOR;
if (!isLocalZipBackupPresent()) {
// Next ask for the cloud backup location
state = RESTORE_WALLET_SELECT_BACKUP_LOCATION;
} else {
// Next select one of the local backups
state = RESTORE_WALLET_SELECT_BACKUP;
}
}
/**
* Create a Trezor hard wallet from a backup summary, decrypting it with a password created from
* the Trezor supplied entropy
*/
private boolean createTrezorHardWallet() {
// Get the model that contains the selected wallet backup to use
SelectBackupSummaryModel selectedBackupSummaryModel =
getWizardModel().getSelectBackupSummaryModel();
if (selectedBackupSummaryModel == null
|| selectedBackupSummaryModel.getValue() == null
|| selectedBackupSummaryModel.getValue().getFile() == null) {
log.debug("No wallet backup to use from the model");
return false;
}
log.debug(
"Loading hard wallet backup '" + selectedBackupSummaryModel.getValue().getFile() + "'");
try {
// For Trezor hard wallets the backups are encrypted with the entropy derived password
String walletPassword = null;
Optional<HardwareWalletService> hardwareWalletService =
CoreServices.getOrCreateHardwareWalletService();
if (hardwareWalletService.isPresent()
&& hardwareWalletService.get().getContext().getEntropy().isPresent()) {
walletPassword =
Hex.toHexString(hardwareWalletService.get().getContext().getEntropy().get());
}
// Check there is a wallet password - if not then cannot decrypt backup
if (walletPassword == null) {
log.debug(
"Cannot work out the password to decrypt the backup - there is no entropy from the Trezor");
return false;
}
KeyParameter backupAESKey =
AESUtils.createAESKey(
walletPassword.getBytes(Charsets.UTF_8), WalletManager.scryptSalt());
WalletId loadedWalletId =
BackupManager.INSTANCE.loadZipBackup(
selectedBackupSummaryModel.getValue().getFile(), backupAESKey);
// Attempt to open the wallet
final Optional<WalletSummary> walletSummaryOptional =
WalletManager.INSTANCE.openWalletFromWalletId(
InstallationManager.getOrCreateApplicationDataDirectory(),
loadedWalletId,
walletPassword);
// If the wallet is present then it was opened successfully
return walletSummaryOptional.isPresent();
} catch (Exception e) {
log.error("Failed to restore Trezor hard wallet.", e);
}
// Must have failed to be here
return false;
}
/** Create a wallet from a seed phrase and a backup summary (chosen by the user) */
private boolean createWalletFromSeedPhrase(List<String> seedPhrase) {
if (!verifySeedPhrase(seedPhrase)) {
return false;
}
// Get the model that contains the selected wallet backup to use
SelectBackupSummaryModel selectedBackupSummaryModel =
getWizardModel().getSelectBackupSummaryModel();
if (selectedBackupSummaryModel == null
|| selectedBackupSummaryModel.getValue() == null
|| selectedBackupSummaryModel.getValue().getFile() == null) {
log.debug("No wallet backup to use from the model");
return false;
}
log.debug(
"Loading soft wallet backup '" + selectedBackupSummaryModel.getValue().getFile() + "'");
try {
WalletId loadedWalletId =
BackupManager.INSTANCE.loadZipBackup(
selectedBackupSummaryModel.getValue().getFile(), seedPhrase);
// Locate the installation directory
File applicationDataDirectory = InstallationManager.getOrCreateApplicationDataDirectory();
// Work out what the wallet credentials was from the encrypted value stored in the
// WalletSummary
SeedPhraseGenerator seedPhraseGenerator = new Bip39SeedPhraseGenerator();
byte[] seed = seedPhraseGenerator.convertToSeed(seedPhrase);
String walletRoot =
applicationDataDirectory.getAbsolutePath()
+ File.separator
+ WalletManager.createWalletRoot(loadedWalletId);
WalletSummary walletSummary =
WalletManager.getOrCreateWalletSummary(new File(walletRoot), loadedWalletId);
KeyParameter backupAESKey = AESUtils.createAESKey(seed, WalletManager.scryptSalt());
byte[] decryptedPaddedWalletPasswordBytes =
org.multibit.commons.crypto.AESUtils.decrypt(
walletSummary.getEncryptedPassword(),
backupAESKey,
WalletManager.aesInitialisationVector());
byte[] decryptedWalletPasswordBytes =
WalletManager.unpadPasswordBytes(decryptedPaddedWalletPasswordBytes);
String decryptedWalletPassword = new String(decryptedWalletPasswordBytes, "UTF8");
// Attempt to open the wallet
final Optional<WalletSummary> walletSummaryOptional =
WalletManager.INSTANCE.openWalletFromWalletId(
InstallationManager.getOrCreateApplicationDataDirectory(),
loadedWalletId,
decryptedWalletPassword);
// If the wallet is present then it was opened successfully
return walletSummaryOptional.isPresent();
} catch (Exception e) {
log.error("Failed to restore wallet from seed phrase.", e);
}
// Must have failed to be here
return false;
}