public static void estimateKeyDerivationTime() {
// This is run in the background after startup. If we haven't recorded it before, do a key
// derivation to see
// how long it takes. This helps us produce better progress feedback, as on Windows we don't
// currently have a
// native Scrypt impl and the Java version is ~3 times slower, plus it depends a lot on CPU
// speed.
checkGuiThread();
estimatedKeyDerivationTime = Main.instance.prefs.getExpectedKeyDerivationTime();
if (estimatedKeyDerivationTime == null) {
new Thread(
() -> {
log.info("Doing background test key derivation");
KeyCrypterScrypt scrypt = new KeyCrypterScrypt(SCRYPT_PARAMETERS);
long start = System.currentTimeMillis();
scrypt.deriveKey("test password");
long msec = System.currentTimeMillis() - start;
log.info("Background test key derivation took {}msec", msec);
Platform.runLater(
() -> {
estimatedKeyDerivationTime = Duration.ofMillis(msec);
Main.instance.prefs.setExpectedKeyDerivationTime(estimatedKeyDerivationTime);
});
})
.start();
}
}
public class WalletSetPasswordController {
private static final Logger log = LoggerFactory.getLogger(WalletSetPasswordController.class);
public PasswordField pass1, pass2;
public ProgressIndicator progressMeter;
public GridPane widgetGrid;
public HBox buttonHBox;
public Label explanationLabel;
public Main.OverlayUI overlayUI;
// These params were determined empirically on a top-range (as of 2014) MacBook Pro with native
// scrypt support,
// using the scryptenc command line tool from the original scrypt distribution, given a memory
// limit of 40mb.
public static final Protos.ScryptParameters SCRYPT_PARAMETERS =
Protos.ScryptParameters.newBuilder()
.setP(6)
.setR(8)
.setN(32768)
.setSalt(ByteString.copyFrom(KeyCrypterScrypt.randomSalt()))
.build();
public void initialize() {
progressMeter.setOpacity(0);
}
public static Duration estimatedKeyDerivationTime = null;
public static void estimateKeyDerivationTime() {
// This is run in the background after startup. If we haven't recorded it before, do a key
// derivation to see
// how long it takes. This helps us produce better progress feedback, as on Windows we don't
// currently have a
// native Scrypt impl and the Java version is ~3 times slower, plus it depends a lot on CPU
// speed.
checkGuiThread();
estimatedKeyDerivationTime = Main.instance.prefs.getExpectedKeyDerivationTime();
if (estimatedKeyDerivationTime == null) {
new Thread(
() -> {
log.info("Doing background test key derivation");
KeyCrypterScrypt scrypt = new KeyCrypterScrypt(SCRYPT_PARAMETERS);
long start = System.currentTimeMillis();
scrypt.deriveKey("test password");
long msec = System.currentTimeMillis() - start;
log.info("Background test key derivation took {}msec", msec);
Platform.runLater(
() -> {
estimatedKeyDerivationTime = Duration.ofMillis(msec);
Main.instance.prefs.setExpectedKeyDerivationTime(estimatedKeyDerivationTime);
});
})
.start();
}
}
@FXML
public void setPasswordClicked(ActionEvent event) {
if (!pass1.getText().equals(pass2.getText())) {
informationalAlert(tr("Passwords do not match"), tr("Try re-typing your chosen passwords."));
return;
}
String password = pass1.getText();
// This is kind of arbitrary and we could do much more to help people pick strong passwords.
if (password.length() < 4) {
informationalAlert(
tr("Password too short"),
tr("You need to pick a password at least five characters or longer."));
return;
}
fadeIn(progressMeter);
fadeOut(widgetGrid);
fadeOut(explanationLabel);
fadeOut(buttonHBox);
KeyCrypterScrypt scrypt = new KeyCrypterScrypt(SCRYPT_PARAMETERS);
// Deriving the actual key runs on a background thread. 500msec is empirical on my laptop
// (actual val is more like 333 but we give padding time).
KeyDerivationTasks tasks =
new KeyDerivationTasks(scrypt, password, estimatedKeyDerivationTime) {
@Override
protected void onFinish(KeyParameter aesKey, int timeTakenMsec) {
// Write the target time to the wallet so we can make the progress bar work when
// entering the password.
WalletPasswordController.setTargetTime(Duration.ofMillis(timeTakenMsec));
// The actual encryption part doesn't take very long as most private keys are derived on
// demand.
log.info("Key derived, now encrypting");
Main.bitcoin.wallet().encrypt(scrypt, aesKey);
log.info("Encryption done");
informationalAlert(
tr("Wallet encrypted"),
tr("You can remove the password at any time from the settings screen."));
overlayUI.done();
}
};
progressMeter.progressProperty().bind(tasks.progress);
tasks.start();
}
@FXML
public void closeClicked(ActionEvent event) {
overlayUI.done();
}
}