Add sharing of groups between databases

* Add source folder keeshare for sharing with corresponding define WITH_XC_KEESHARE
* Move common crypto parts to src/crypto/ssh
* Extended OpenSSHKey
* Move filewatching to own file (currently in two related classes DelayedFileWatcher and BulkFileWatcher)
* Small improvements for style and code in several classes
* Sharing is secured using RSA-Keys which are generated on demand
* Publisher signs the container using their private key
* Client can verify the signed container and choose to decline an import,
import only once or trust the publisher and automatically import all
data of this source henceforth
* Integration of settings into Group-Settings, Database-Settings and Application-Settings
* Introduced dependency QuaZip as dependency to allow combined export of
key container and the (custom format) certificate

tests/stub/TestRandom.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 KeePassXC Team <team@keepassxc.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 or (at your option)
+ * version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "TestRandom.h"
+#include "TestGlobal.h"
+
+RandomBackendPreset::RandomBackendPreset()
+    : m_bytesIndex(0)
+{
+}
+
+void RandomBackendPreset::randomize(void* data, int len)
+{
+    QVERIFY(len <= (m_nextBytes.size() - m_bytesIndex));
+
+    char* charData = reinterpret_cast<char*>(data);
+
+    for (int i = 0; i < len; i++) {
+        charData[i] = m_nextBytes[m_bytesIndex + i];
+    }
+
+    m_bytesIndex += len;
+}
+
+void RandomBackendPreset::setNextBytes(const QByteArray& nextBytes)
+{
+    m_nextBytes = nextBytes;
+    m_bytesIndex = 0;
+}
+
+void TestRandom::setup(RandomBackend* backend)
+{
+    Random::setInstance(backend);
+}
+
+void TestRandom::teardown()
+{
+    Random::resetInstance();
+}
+
+void RandomBackendNull::randomize(void* data, int len)
+{
+    char* charData = reinterpret_cast<char*>(data);
+
+    for (int i = 0; i < len; i++) {
+        charData[i] = '\0';
+    }
+}

tests/stub/TestRandom.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 KeePassXC Team <team@keepassxc.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 or (at your option)
+ * version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSXC_TESTRANDOM_H
+#define KEEPASSXC_TESTRANDOM_H
+
+#include "crypto/Random.h"
+
+class RandomBackendPreset : public RandomBackend
+{
+public:
+    RandomBackendPreset();
+    void randomize(void* data, int len) override;
+    void setNextBytes(const QByteArray& nextBytes);
+
+private:
+    QByteArray m_nextBytes;
+    int m_bytesIndex;
+};
+
+class RandomBackendNull : public RandomBackend
+{
+public:
+    void randomize(void* data, int len) override;
+};
+
+class TestRandom : public Random
+{
+public:
+    static void setup(RandomBackend* backend);
+    static void teardown();
+};
+
+#endif // KEEPASSXC_TESTRANDOM_H