Added change pw buttons; encryption is very nearly done.

@apprb there is one question and one TODO that you should look over in privacyform.cpp, as well as a TODO in historykeeper.cpp
Also both the encryption settings box and the pw dialog lineedits should probably be in a QGridLayout... but I don't really want to do that by hand :P

src/coreencryption.cpp

@@ -72,6 +72,9 @@ void Core::clearPassword(PasswordType passtype)
         delete[] pwsaltedkeys[passtype];
         pwsaltedkeys[passtype] = nullptr;
     }
+
+    if (passtype == ptMain)
+        saveConfiguration();
 }
 
 QByteArray Core::encryptData(const QByteArray& data, PasswordType passtype)

src/historykeeper.cpp

@@ -137,7 +137,7 @@ HistoryKeeper::~HistoryKeeper()
 
 void HistoryKeeper::reencrypt(QString newpw)
 {
-    // this needs to appropriately set the core password as well
+    // TODO: this needs to appropriately set the core password as well
     // if newpw.isEmpty(), then use the other core password
 }
 

src/widget/form/setpassworddialog.cpp

@@ -27,7 +27,8 @@ SetPasswordDialog::SetPasswordDialog(QString body, QString extraButton, QWidget*
     connect(ui->passwordlineEdit, SIGNAL(textChanged(QString)), this, SLOT(onPasswordEdit()));
     connect(ui->repasswordlineEdit, SIGNAL(textChanged(QString)), this, SLOT(onPasswordEdit()));
 
-    ui->body->setText(body);
+    ui->body->setText(body + tr("\nTo encourage good habits, qTox requires at least 8 characters."));
+    ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
 
     if (!extraButton.isEmpty())
     {
@@ -44,7 +45,7 @@ SetPasswordDialog::~SetPasswordDialog()
 
 void SetPasswordDialog::onPasswordEdit()
 {
-    if (  !ui->passwordlineEdit->text().isEmpty()
+    if (   ui->passwordlineEdit->text().length() >= 8
         && ui->passwordlineEdit->text() == ui->repasswordlineEdit->text())
         ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(true);
     else

src/widget/form/setpassworddialog.ui

@@ -20,6 +20,19 @@
    <item>
     <widget class="QLabel" name="body" />
    </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>12</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
    <item>
     <layout class="QHBoxLayout" name="hLayout1">
      <item>
@@ -64,7 +77,7 @@
      <property name="sizeHint" stdset="0">
       <size>
        <width>20</width>
-       <height>40</height>
+       <height>12</height>
       </size>
      </property>
     </spacer>

src/widget/form/settings/privacyform.cpp

@@ -32,10 +32,15 @@ PrivacyForm::PrivacyForm() :
     bodyUI = new Ui::PrivacySettings;
     bodyUI->setupUi(this);
 
+    bodyUI->encryptToxHLayout->addStretch();
+    bodyUI->encryptLogsHLayout->addStretch();
+
     connect(bodyUI->cbTypingNotification, SIGNAL(stateChanged(int)), this, SLOT(onTypingNotificationEnabledUpdated()));
     connect(bodyUI->cbKeepHistory, SIGNAL(stateChanged(int)), this, SLOT(onEnableLoggingUpdated()));
     connect(bodyUI->cbEncryptHistory, SIGNAL(clicked()), this, SLOT(onEncryptLogsUpdated()));
+    connect(bodyUI->changeLogsPwButton, &QPushButton::clicked, this, &PrivacyForm::setChatLogsPassword);
     connect(bodyUI->cbEncryptTox, SIGNAL(clicked()), this, SLOT(onEncryptToxUpdated()));
+    connect(bodyUI->changeToxPwButton, &QPushButton::clicked, this, &PrivacyForm::setToxPassword);
     connect(bodyUI->nospamLineEdit, SIGNAL(editingFinished()), this, SLOT(setNospam()));
     connect(bodyUI->randomNosapamButton, SIGNAL(clicked()), this, SLOT(generateRandomNospam()));
     connect(bodyUI->nospamLineEdit, SIGNAL(textChanged(QString)), this, SLOT(onNospamEdit()));
@@ -61,8 +66,9 @@ void PrivacyForm::onTypingNotificationEnabledUpdated()
 
 bool PrivacyForm::setChatLogsPassword()
 {
+    Core* core = Core::getInstance();
     SetPasswordDialog* dialog;
-    QString body = tr("Please set your new chat log password:");
+    QString body = tr("Please set your new chat log password.");
     if (core->isPasswordSet(Core::ptMain))
         dialog = new SetPasswordDialog(body, tr("Use data file password", "pushbutton text"), this);
     else
@@ -110,7 +116,8 @@ void PrivacyForm::onEncryptLogsUpdated()
                 Settings::getInstance().setEncryptLogs(true);
                 bodyUI->cbEncryptHistory->setChecked(true);
                 // not logically necessary, but more consistent (esp. if the logic changes)
-                // enable change pw button
+                bodyUI->changeLogsPwButton->setEnabled(true);
+                return;
             }
         }
     }
@@ -127,13 +134,14 @@ void PrivacyForm::onEncryptLogsUpdated()
     core->clearPassword(Core::ptHistory);
     Settings::getInstance().setEncryptLogs(false);
     bodyUI->cbEncryptHistory->setChecked(false);
-    // disable change pw button
+    bodyUI->changeLogsPwButton->setEnabled(false);
 }
 
 bool PrivacyForm::setToxPassword()
 {
+    Core* core = Core::getInstance();
     SetPasswordDialog* dialog;
-    QString body = tr("Please set your new data file password:");
+    QString body = tr("Please set your new data file password.");
     if (core->isPasswordSet(Core::ptHistory))
         dialog = new SetPasswordDialog(body, tr("Use chat log password", "pushbutton text"), this);
     else
@@ -162,18 +170,18 @@ void PrivacyForm::onEncryptToxUpdated()
     Core* core = Core::getInstance();
 
     if (bodyUI->cbEncryptTox->isChecked())
-        if (!Core::getInstance()->isPasswordSet(Core::ptMain))
+        if (!core->isPasswordSet(Core::ptMain))
             if (setToxPassword())
             {
                 bodyUI->cbEncryptTox->setChecked(true);
                 Settings::getInstance().setEncryptTox(true);
-                // enable change pw button
+                bodyUI->changeToxPwButton->setEnabled(true);
                 return;
             }
 
     bodyUI->cbEncryptTox->setChecked(false);
     Settings::getInstance().setEncryptTox(false);
-    // disable change pw button
+    bodyUI->changeToxPwButton->setEnabled(false);
     core->clearPassword(Core::ptMain);
 }
 
@@ -193,8 +201,10 @@ void PrivacyForm::present()
     bodyUI->cbTypingNotification->setChecked(Settings::getInstance().isTypingNotificationEnabled());
     bodyUI->cbKeepHistory->setChecked(Settings::getInstance().getEnableLogging());
     bodyUI->cbEncryptHistory->setChecked(Settings::getInstance().getEncryptLogs());
+    bodyUI->changeLogsPwButton->setEnabled(Settings::getInstance().getEncryptLogs());
     bodyUI->cbEncryptHistory->setEnabled(Settings::getInstance().getEnableLogging());
     bodyUI->cbEncryptTox->setChecked(Settings::getInstance().getEncryptTox());
+    bodyUI->changeToxPwButton->setEnabled(Settings::getInstance().getEncryptTox());
 }
 
 void PrivacyForm::generateRandomNospam()

src/widget/form/settings/privacysettings.ui

@@ -70,6 +70,8 @@
           <string>Encryption</string>
          </property>
          <layout class="QVBoxLayout" name="verticalLayout_2">
+          <item>
+           <layout class="QHBoxLayout" name="encryptToxHLayout">
             <item>
              <widget class="QCheckBox" name="cbEncryptTox">
               <property name="enabled">
@@ -80,6 +82,17 @@
               </property>
              </widget>
             </item>
+            <item>
+             <widget class="QPushButton" name="changeToxPwButton">
+              <property name="text">
+               <string>Change password</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <layout class="QHBoxLayout" name="encryptLogsHLayout">
             <item>
              <widget class="QCheckBox" name="cbEncryptHistory">
               <property name="enabled">
@@ -93,6 +106,15 @@
               </property>
              </widget>
             </item>
+            <item>
+             <widget class="QPushButton" name="changeLogsPwButton">
+              <property name="text">
+               <string>Change password</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
          </layout>
         </widget>
        </item>