Import/export keys.

alethzero/Main.ui

@@ -135,8 +135,11 @@
      <string>T&amp;ools</string>
     </property>
     <addaction name="mine"/>
-    <addaction name="create"/>
     <addaction name="preview"/>
+    <addaction name="separator"/>
+    <addaction name="create"/>
+    <addaction name="importKey"/>
+    <addaction name="exportKey"/>
    </widget>
    <widget class="QMenu" name="menu_Help">
     <property name="title">
@@ -1032,6 +1035,16 @@
     <string>&amp;Kill Blockchain</string>
    </property>
   </action>
+  <action name="importKey">
+   <property name="text">
+    <string>&amp;Import Key...</string>
+   </property>
+  </action>
+  <action name="exportKey">
+   <property name="text">
+    <string>&amp;Export Selected Key...</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>

alethzero/MainWin.cpp

@@ -385,6 +385,35 @@ void Main::readSettings()
 	on_urlEdit_returnPressed();
 }
 
+void Main::on_importKey_triggered()
+{
+	QString s = QInputDialog::getText(this, "Import Account Key", "Enter account's secret key");
+	bytes b = fromHex(s.toStdString());
+	if (b.size() == 32)
+	{
+		auto k = KeyPair(h256(b));
+		if (std::find(m_myKeys.begin(), m_myKeys.end(), k) == m_myKeys.end())
+		{
+			m_myKeys.append(k);
+			m_keysChanged = true;
+			update();
+		}
+		else
+			QMessageBox::warning(this, "Already Have Key", "Could not import the secret key: we already own this account.");
+	}
+	else
+		QMessageBox::warning(this, "Invalid Entry", "Could not import the secret key; invalid key entered. Make sure it is 64 hex characters (0-9 or A-F).");
+}
+
+void Main::on_exportKey_triggered()
+{
+	if (ui->ourAccounts->currentRow() >= 0 && ui->ourAccounts->currentRow() < m_myKeys.size())
+	{
+		auto k = m_myKeys[ui->ourAccounts->currentRow()];
+		QMessageBox::information(this, "Export Account Key", "Secret key to account " + render(k.address()) + " is:\n" + QString::fromStdString(toHex(k.sec().ref())));
+	}
+}
+
 void Main::on_urlEdit_returnPressed()
 {
 	ui->webView->setUrl(ui->urlEdit->text());

alethzero/MainWin.h

@@ -77,6 +77,8 @@ private slots:
 	void on_debugTimeline_valueChanged();
 	void on_jsInput_returnPressed();
 	void on_killBlockchain_triggered();
+	void on_importKey_triggered();
+	void on_exportKey_triggered();
 
 	void refresh(bool _override = false);
 	void refreshNetwork();