/**
* 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 an wallet id from the given seed and salt
*
* <p>You can use this to generate a wallet id for a Trezor soft wallet passing in
* WALLET_ID_SALT_USED_IN_SCRYPT_FOR_TREZOR_SOFT_WALLETS This produces a wallet id from the seed
* using various trapdoor functions. The seed is typically generated from the
* SeedPhraseGenerator#convertToSeed method.
*
* @param seed The seed to use in deriving the wallet id
*/
public WalletId(byte[] seed, byte[] salt) {
walletId = AESUtils.generate160BitsOfEntropy(seed, salt);
}
/** 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;
}
/**
* Create an MBHD wallet id from the given seed. This produces a wallet id from the seed using
* various trapdoor functions. The seed is typically generated from the
* SeedPhraseGenerator#convertToSeed method.
*
* @param seed The seed to use in deriving the wallet id
*/
public WalletId(byte[] seed) {
walletId =
AESUtils.generate160BitsOfEntropy(seed, WALLET_ID_SALT_USED_IN_SCRYPT_FOR_MBHD_WALLETS);
}