diff --git a/src/qt/askpassphrasedialog.cpp b/src/qt/askpassphrasedialog.cpp
index b0b0f15ca..cb8e1f891 100644
--- a/src/qt/askpassphrasedialog.cpp
+++ b/src/qt/askpassphrasedialog.cpp
@@ -1,281 +1,281 @@
 // Copyright (c) 2011-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #if defined(HAVE_CONFIG_H)
 #include <config/bitcoin-config.h>
 #endif
 
 #include <qt/askpassphrasedialog.h>
 #include <qt/forms/ui_askpassphrasedialog.h>
 
 #include <qt/guiconstants.h>
 #include <qt/walletmodel.h>
 #include <support/allocators/secure.h>
 
 #include <QKeyEvent>
 #include <QMessageBox>
 #include <QPushButton>
 
 AskPassphraseDialog::AskPassphraseDialog(Mode _mode, QWidget *parent)
     : QDialog(parent), ui(new Ui::AskPassphraseDialog), mode(_mode), model(0),
       fCapsLock(false) {
     ui->setupUi(this);
 
     ui->passEdit1->setMinimumSize(ui->passEdit1->sizeHint());
     ui->passEdit2->setMinimumSize(ui->passEdit2->sizeHint());
     ui->passEdit3->setMinimumSize(ui->passEdit3->sizeHint());
 
     ui->passEdit1->setMaxLength(MAX_PASSPHRASE_SIZE);
     ui->passEdit2->setMaxLength(MAX_PASSPHRASE_SIZE);
     ui->passEdit3->setMaxLength(MAX_PASSPHRASE_SIZE);
 
     // Setup Caps Lock detection.
     ui->passEdit1->installEventFilter(this);
     ui->passEdit2->installEventFilter(this);
     ui->passEdit3->installEventFilter(this);
 
     switch (mode) {
         case Encrypt: // Ask passphrase x2
             ui->warningLabel->setText(
                 tr("Enter the new passphrase to the wallet.<br/>Please use a "
                    "passphrase of <b>ten or more random characters</b>, or "
                    "<b>eight or more words</b>."));
             ui->passLabel1->hide();
             ui->passEdit1->hide();
             setWindowTitle(tr("Encrypt wallet"));
             break;
         case Unlock: // Ask passphrase
             ui->warningLabel->setText(tr("This operation needs your wallet "
                                          "passphrase to unlock the wallet."));
             ui->passLabel2->hide();
             ui->passEdit2->hide();
             ui->passLabel3->hide();
             ui->passEdit3->hide();
             setWindowTitle(tr("Unlock wallet"));
             break;
         case Decrypt: // Ask passphrase
             ui->warningLabel->setText(tr("This operation needs your wallet "
                                          "passphrase to decrypt the wallet."));
             ui->passLabel2->hide();
             ui->passEdit2->hide();
             ui->passLabel3->hide();
             ui->passEdit3->hide();
             setWindowTitle(tr("Decrypt wallet"));
             break;
         case ChangePass: // Ask old passphrase + new passphrase x2
             setWindowTitle(tr("Change passphrase"));
             ui->warningLabel->setText(tr(
                 "Enter the old passphrase and new passphrase to the wallet."));
             break;
     }
     textChanged();
     connect(ui->toggleShowPasswordButton, SIGNAL(toggled(bool)), this,
             SLOT(toggleShowPassword(bool)));
     connect(ui->passEdit1, SIGNAL(textChanged(QString)), this,
             SLOT(textChanged()));
     connect(ui->passEdit2, SIGNAL(textChanged(QString)), this,
             SLOT(textChanged()));
     connect(ui->passEdit3, SIGNAL(textChanged(QString)), this,
             SLOT(textChanged()));
 }
 
 AskPassphraseDialog::~AskPassphraseDialog() {
     secureClearPassFields();
     delete ui;
 }
 
 void AskPassphraseDialog::setModel(WalletModel *_model) {
     this->model = _model;
 }
 
 void AskPassphraseDialog::accept() {
     SecureString oldpass, newpass1, newpass2;
     if (!model) return;
     oldpass.reserve(MAX_PASSPHRASE_SIZE);
     newpass1.reserve(MAX_PASSPHRASE_SIZE);
     newpass2.reserve(MAX_PASSPHRASE_SIZE);
     // TODO: get rid of this .c_str() by implementing
     // SecureString::operator=(std::string)
     // Alternately, find a way to make this input mlock()'d to begin with.
     oldpass.assign(ui->passEdit1->text().toStdString().c_str());
     newpass1.assign(ui->passEdit2->text().toStdString().c_str());
     newpass2.assign(ui->passEdit3->text().toStdString().c_str());
 
     secureClearPassFields();
 
     switch (mode) {
         case Encrypt: {
             if (newpass1.empty() || newpass2.empty()) {
                 // Cannot encrypt with empty passphrase
                 break;
             }
             QMessageBox::StandardButton retval = QMessageBox::question(
                 this, tr("Confirm wallet encryption"),
                 tr("Warning: If you encrypt your wallet and lose your "
                    "passphrase, you will <b>LOSE ALL OF YOUR BITCOINS</b>!") +
                     "<br><br>" +
                     tr("Are you sure you wish to encrypt your wallet?"),
                 QMessageBox::Yes | QMessageBox::Cancel, QMessageBox::Cancel);
             if (retval == QMessageBox::Yes) {
                 if (newpass1 == newpass2) {
                     if (model->setWalletEncrypted(true, newpass1)) {
                         QMessageBox::warning(
                             this, tr("Wallet encrypted"),
                             "<qt>" +
                                 tr("%1 will close now to finish the encryption "
                                    "process. "
                                    "Remember that encrypting your wallet "
                                    "cannot fully protect "
                                    "your bitcoins from being stolen by malware "
                                    "infecting your computer.")
                                     .arg(tr(PACKAGE_NAME)) +
                                 "<br><br><b>" +
                                 tr("IMPORTANT: Any previous backups you have "
                                    "made of your wallet file "
                                    "should be replaced with the newly "
                                    "generated, encrypted wallet file. "
                                    "For security reasons, previous backups of "
                                    "the unencrypted wallet file "
                                    "will become useless as soon as you start "
                                    "using the new, encrypted wallet.") +
                                 "</b></qt>");
                         QApplication::quit();
                     } else {
                         QMessageBox::critical(
                             this, tr("Wallet encryption failed"),
                             tr("Wallet encryption failed due to an internal "
                                "error. Your wallet was not encrypted."));
                     }
                     QDialog::accept(); // Success
                 } else {
                     QMessageBox::critical(
                         this, tr("Wallet encryption failed"),
                         tr("The supplied passphrases do not match."));
                 }
             } else {
                 QDialog::reject(); // Cancelled
             }
         } break;
         case Unlock:
             if (!model->setWalletLocked(false, oldpass)) {
                 QMessageBox::critical(this, tr("Wallet unlock failed"),
                                       tr("The passphrase entered for the "
                                          "wallet decryption was incorrect."));
             } else {
                 QDialog::accept(); // Success
             }
             break;
         case Decrypt:
             if (!model->setWalletEncrypted(false, oldpass)) {
                 QMessageBox::critical(this, tr("Wallet decryption failed"),
                                       tr("The passphrase entered for the "
                                          "wallet decryption was incorrect."));
             } else {
                 QDialog::accept(); // Success
             }
             break;
         case ChangePass:
             if (newpass1 == newpass2) {
                 if (model->changePassphrase(oldpass, newpass1)) {
                     QMessageBox::information(
                         this, tr("Wallet encrypted"),
                         tr("Wallet passphrase was successfully changed."));
                     QDialog::accept(); // Success
                 } else {
                     QMessageBox::critical(
                         this, tr("Wallet encryption failed"),
                         tr("The passphrase entered for the wallet decryption "
                            "was incorrect."));
                 }
             } else {
                 QMessageBox::critical(
                     this, tr("Wallet encryption failed"),
                     tr("The supplied passphrases do not match."));
             }
             break;
     }
 }
 
 void AskPassphraseDialog::textChanged() {
     // Validate input, set Ok button to enabled when acceptable
     bool acceptable = false;
     switch (mode) {
         case Encrypt: // New passphrase x2
             acceptable = !ui->passEdit2->text().isEmpty() &&
                          !ui->passEdit3->text().isEmpty();
             break;
         case Unlock: // Old passphrase x1
         case Decrypt:
             acceptable = !ui->passEdit1->text().isEmpty();
             break;
         case ChangePass: // Old passphrase x1, new passphrase x2
             acceptable = !ui->passEdit1->text().isEmpty() &&
                          !ui->passEdit2->text().isEmpty() &&
                          !ui->passEdit3->text().isEmpty();
             break;
     }
     ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(acceptable);
 }
 
 bool AskPassphraseDialog::event(QEvent *event) {
     // Detect Caps Lock key press.
     if (event->type() == QEvent::KeyPress) {
         QKeyEvent *ke = static_cast<QKeyEvent *>(event);
         if (ke->key() == Qt::Key_CapsLock) {
             fCapsLock = !fCapsLock;
         }
         if (fCapsLock) {
             ui->capsLabel->setText(tr("Warning: The Caps Lock key is on!"));
         } else {
             ui->capsLabel->clear();
         }
     }
     return QWidget::event(event);
 }
 
 void AskPassphraseDialog::toggleShowPassword(bool show) {
     ui->toggleShowPasswordButton->setDown(show);
-    const auto mode = show ? QLineEdit::Normal : QLineEdit::Password;
-    ui->passEdit1->setEchoMode(mode);
-    ui->passEdit2->setEchoMode(mode);
-    ui->passEdit3->setEchoMode(mode);
+    const auto renderingMode = show ? QLineEdit::Normal : QLineEdit::Password;
+    ui->passEdit1->setEchoMode(renderingMode);
+    ui->passEdit2->setEchoMode(renderingMode);
+    ui->passEdit3->setEchoMode(renderingMode);
 }
 
 bool AskPassphraseDialog::eventFilter(QObject *object, QEvent *event) {
     /* Detect Caps Lock.
      * There is no good OS-independent way to check a key state in Qt, but we
      * can detect Caps Lock by checking for the following condition:
      * Shift key is down and the result is a lower case character, or
      * Shift key is not down and the result is an upper case character.
      */
     if (event->type() == QEvent::KeyPress) {
         QKeyEvent *ke = static_cast<QKeyEvent *>(event);
         QString str = ke->text();
         if (str.length() != 0) {
             const QChar *psz = str.unicode();
             bool fShift = (ke->modifiers() & Qt::ShiftModifier) != 0;
             if ((fShift && *psz >= 'a' && *psz <= 'z') ||
                 (!fShift && *psz >= 'A' && *psz <= 'Z')) {
                 fCapsLock = true;
                 ui->capsLabel->setText(tr("Warning: The Caps Lock key is on!"));
             } else if (psz->isLetter()) {
                 fCapsLock = false;
                 ui->capsLabel->clear();
             }
         }
     }
     return QDialog::eventFilter(object, event);
 }
 
 static void SecureClearQLineEdit(QLineEdit *edit) {
     // Attempt to overwrite text so that they do not linger around in memory
     edit->setText(QString(" ").repeated(edit->text().size()));
     edit->clear();
 }
 
 void AskPassphraseDialog::secureClearPassFields() {
     SecureClearQLineEdit(ui->passEdit1);
     SecureClearQLineEdit(ui->passEdit2);
     SecureClearQLineEdit(ui->passEdit3);
 }