Optionally allow AskPassphraseDialog to output the passphrase

Author: achow101

src/qt/askpassphrasedialog.cpp

@@ -18,12 +18,13 @@
 #include <QMessageBox>
 #include <QPushButton>
 
-AskPassphraseDialog::AskPassphraseDialog(Mode _mode, QWidget *parent) :
+AskPassphraseDialog::AskPassphraseDialog(Mode _mode, QWidget *parent, SecureString* passphrase_out) :
     QDialog(parent),
     ui(new Ui::AskPassphraseDialog),
     mode(_mode),
     model(nullptr),
-    fCapsLock(false)
+    fCapsLock(false),
+    m_passphrase_out(passphrase_out)
 {
     ui->setupUi(this);
 
@@ -90,7 +91,7 @@ void AskPassphraseDialog::setModel(WalletModel *_model)
 void AskPassphraseDialog::accept()
 {
     SecureString oldpass, newpass1, newpass2;
-    if(!model)
+    if (!model && mode != Encrypt)
         return;
     oldpass.reserve(MAX_PASSPHRASE_SIZE);
     newpass1.reserve(MAX_PASSPHRASE_SIZE);
@@ -119,24 +120,33 @@ void AskPassphraseDialog::accept()
         {
             if(newpass1 == newpass2)
             {
-                if(model->setWalletEncrypted(true, newpass1))
-                {
-                    QMessageBox::warning(this, tr("Wallet encrypted"),
+                QString encryption_reminder = tr("Remember that encrypting your wallet cannot fully protect "
+                "your bitcoins from being stolen by malware infecting your computer.");
+                if (m_passphrase_out) {
+                    m_passphrase_out->assign(newpass1);
+                    QMessageBox::warning(this, tr("Wallet to be encrypted"),
                                          "<qt>" +
-                                         tr("Your wallet is now encrypted. "
-                                         "Remember that encrypting your wallet cannot fully protect "
-                                         "your bitcoins from being stolen by malware infecting your computer.") +
-                                         "<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.") +
+                                         tr("Your wallet is about to be encrypted. ") + encryption_reminder +
                                          "</b></qt>");
-                }
-                else
-                {
-                    QMessageBox::critical(this, tr("Wallet encryption failed"),
-                                         tr("Wallet encryption failed due to an internal error. Your wallet was not encrypted."));
+                } else {
+                    assert(model != nullptr);
+                    if(model->setWalletEncrypted(true, newpass1))
+                    {
+                        QMessageBox::warning(this, tr("Wallet encrypted"),
+                                             "<qt>" +
+                                             tr("Your wallet is now encrypted. ") + encryption_reminder +
+                                             "<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>");
+                    }
+                    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
             }

src/qt/askpassphrasedialog.h

@@ -7,6 +7,8 @@
 
 #include <QDialog>
 
+#include <support/allocators/secure.h>
+
 class WalletModel;
 
 namespace Ui {
@@ -27,7 +29,7 @@ class AskPassphraseDialog : public QDialog
         Decrypt     /**< Ask passphrase and decrypt wallet */
     };
 
-    explicit AskPassphraseDialog(Mode mode, QWidget *parent);
+    explicit AskPassphraseDialog(Mode mode, QWidget *parent, SecureString* passphrase_out = nullptr);
     ~AskPassphraseDialog();
 
     void accept();
@@ -39,6 +41,7 @@ class AskPassphraseDialog : public QDialog
     Mode mode;
     WalletModel *model;
     bool fCapsLock;
+    SecureString* m_passphrase_out;
 
 private Q_SLOTS:
     void textChanged();