feat: wip omemo + key publish

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "external/qxmpp"]
 	path = external/qxmpp
 	url = https://github.com/qxmpp-project/qxmpp.git
+[submodule "external/signal-protocol-c"]
+	path = external/signal-protocol-c
+	url = https://github.com/signalapp/libsignal-protocol-c.git

CMakeLists.txt

@@ -16,12 +16,14 @@ add_executable(squawk)
 target_include_directories(squawk PRIVATE ${CMAKE_SOURCE_DIR})
 
 option(SYSTEM_QXMPP "Use system qxmpp lib" ON)
+option(SYSTEM_SIGNAL "Use system signal-protocol-c lib" ON)
 option(WITH_KWALLET "Build KWallet support module" ON)
 option(WITH_KIO "Build KIO support module" ON)
 
 # Dependencies
 ## Qt
 find_package(Qt5 COMPONENTS Widgets DBus Gui Xml Network Core REQUIRED)
+target_link_libraries(squawk PRIVATE Qt5::Core Qt5::Widgets Qt5::DBus Qt5::Network Qt5::Gui Qt5::Xml)
 
 ## QXmpp
 if (SYSTEM_QXMPP)
@@ -42,6 +44,16 @@ else ()
   target_link_libraries(squawk PRIVATE QXmpp::QXmpp)
 endif ()
 
+# Signal
+if (NOT SYSTEM_SIGNAL)
+  add_subdirectory(external/signal-protocol-c)
+  add_dependencies(squawk signal-protocol-c)
+  target_link_libraries(squawk PRIVATE signal-protocol-c)
+else ()
+  find_package(Signal REQUIRED)
+  target_link_libraries(squawk PRIVATE Signal::Signal)
+endif ()
+
 ## KIO
 if (WITH_KIO)
   find_package(KF5KIO CONFIG)
@@ -68,15 +80,15 @@ if (WITH_KWALLET)
   endif ()
 endif ()
 
-## Signal (TODO)
-# find_package(Signal REQUIRED)
-
 ## LMDB
 find_package(LMDB REQUIRED)
-
-# Linking
-target_link_libraries(squawk PRIVATE Qt5::Core Qt5::Widgets Qt5::DBus Qt5::Network Qt5::Gui Qt5::Xml)
 target_link_libraries(squawk PRIVATE lmdb)
+
+# OpenSSL
+find_package(OpenSSL REQUIRED)
+target_link_libraries(squawk PRIVATE OpenSSL::Crypto)
+
+# Misc
 target_link_libraries(squawk PRIVATE simpleCrypt)
 target_link_libraries(squawk PRIVATE uuid)
 
@@ -101,6 +113,7 @@ add_subdirectory(resources)
 add_subdirectory(shared)
 add_subdirectory(translations)
 add_subdirectory(ui)
+add_subdirectory(qomemo)
 
 # Install the executable
 install(TARGETS squawk DESTINATION ${CMAKE_INSTALL_BINDIR})

core/account.cpp

@@ -47,7 +47,8 @@ Account::Account(const QString& p_login, const QString& p_server, const QString&
     network(p_net),
     passwordType(Shared::AccountPassword::plain),
     mh(new MessageHandler(this)),
-    rh(new RosterHandler(this))
+    rh(new RosterHandler(this)),
+    omemo(new QXmpp::Omemo::Manager())
 {
     config.setUser(p_login);
     config.setDomain(p_server);
@@ -90,7 +91,8 @@ Account::Account(const QString& p_login, const QString& p_server, const QString&
     
     client.addExtension(rcpm);
     QObject::connect(rcpm, &QXmppMessageReceiptManager::messageDelivered, mh, &MessageHandler::onReceiptReceived);
-    
+
+    client.addExtension(omemo.get());
     
     QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
     path += "/" + name;

core/account.h

@@ -30,23 +30,24 @@
 #include <map>
 #include <set>
 
-#include <QXmppRosterManager.h>
-#include <QXmppCarbonManager.h>
-#include <QXmppDiscoveryManager.h>
-#include <QXmppMamManager.h>
-#include <QXmppMucManager.h>
-#include <QXmppClient.h>
 #include <QXmppBookmarkManager.h>
 #include <QXmppBookmarkSet.h>
+#include <QXmppCarbonManager.h>
+#include <QXmppClient.h>
+#include <QXmppDiscoveryManager.h>
+#include <QXmppMamManager.h>
+#include <QXmppMessageReceiptManager.h>
+#include <QXmppMucManager.h>
+#include <QXmppRosterManager.h>
 #include <QXmppUploadRequestManager.h>
 #include <QXmppVCardIq.h>
 #include <QXmppVCardManager.h>
-#include <QXmppMessageReceiptManager.h>
+#include <qomemo/qxmpp_omemo_manager.h>
 
-#include "shared/shared.h"
-#include "contact.h"
 #include "conference.h"
+#include "contact.h"
 #include "networkaccess.h"
+#include "shared/shared.h"
 
 #include "handlers/messagehandler.h"
 #include "handlers/rosterhandler.h"
@@ -165,6 +166,8 @@ private:
     
     MessageHandler* mh;
     RosterHandler* rh;
+
+    QScopedPointer<QXmpp::Omemo::Manager> omemo;
     
 private slots:
     void onClientStateChange(QXmppClient::State state);

external/signal-protocol-c

@@ -0,0 +1 @@
+Subproject commit 3a83a4f4ed2302ff6e68ab569c88793b50c22d28

qomemo/CMakeLists.txt

@@ -0,0 +1,25 @@
+target_sources(squawk PRIVATE
+        bundle.cpp
+        bundle.h
+        database.cpp
+        database.h
+        device.cpp
+        device.h
+        device_key_storage.cpp
+        device_key_storage.h
+        device_service.cpp
+        device_service.h
+        key.cpp
+        key.h
+        qomemo.cpp
+        qomemo.h
+        sce.cpp
+        sce.h
+        user_device_list.cpp
+        user_device_list.h
+        qxmpp_omemo_manager.cpp
+        qxmpp_omemo_manager.h
+        )
+
+add_subdirectory(signal)
+add_subdirectory(variant)

qomemo/bundle.cpp

@@ -0,0 +1,5 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "bundle.h"

qomemo/bundle.h

@@ -0,0 +1,34 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include <QList>
+#include <QString>
+#include <QBuffer>
+
+class QXmppPubSubIq;
+
+class QXmppElement;
+
+class QXmppIq;
+
+namespace QXmpp::Omemo {
+
+    class PreKey {
+    public:
+        int id;
+        QByteArray data;
+    };
+
+    class Bundle {
+    public:
+        QByteArray spk;
+        int spkId;
+        QByteArray spks;
+        QByteArray ik;
+        QList<PreKey> prekeys;
+    };
+
+} // namespace QXmpp::Omemo

qomemo/database.cpp

@@ -0,0 +1,180 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "database.h"
+
+#include "bundle.h"
+
+#include <QDebug>
+#include <QDir>
+#include <QException>
+#include <QStandardPaths>
+#include <QString>
+
+using namespace QXmpp::Omemo;
+
+Database::Database(QString jid) : jid(std::move(jid)) {
+    auto cacheLocation =
+            QStandardPaths::writableLocation(QStandardPaths::CacheLocation);
+    auto path = QString("%1/.omemo/%2").arg(cacheLocation, jid);
+    QDir cache(path);
+
+    if (!cache.exists() && !cache.mkpath(path)) {
+        qWarning() << "Could not create:" << path;
+        throw QException();
+    }
+
+    mdb_env_create(&env);
+
+    mdb_env_set_maxdbs(env, 5);
+    mdb_env_set_mapsize(env, 512UL * 1024UL * 1024UL);
+    mdb_env_open(env, path.toStdString().c_str(), 0, 0664);
+
+    MDB_txn *txn;
+    mdb_txn_begin(env, nullptr, 0, &txn);
+    mdb_dbi_open(txn, "keys", MDB_CREATE, &dbiKeys);
+    mdb_dbi_open(txn, "devices", MDB_CREATE, &dbiDevices);
+    mdb_dbi_open(txn, "identity_keys", MDB_CREATE, &dbiIdentityKeys);
+    mdb_txn_commit(txn);
+}
+
+Database::~Database() {
+    mdb_dbi_close(env, dbiKeys);
+    mdb_dbi_close(env, dbiDevices);
+    mdb_dbi_close(env, dbiIdentityKeys);
+    mdb_env_close(env);
+}
+
+std::optional<QByteArray> Database::loadIdentityKeySecret(int deviceId) { return std::nullopt; }
+
+bool Database::saveIdentityKeySecret(int deviceId,
+                                     const QByteArray &identityKeySecret) {
+    MDB_val mdbKey, mdbValue;
+    auto key = QString("%1/secret").arg(QString::number(deviceId)).toStdString();
+
+    mdbKey.mv_data = key.data();
+    mdbKey.mv_size = key.size();
+
+    mdbValue.mv_data = const_cast<char *>(identityKeySecret.data());
+    mdbValue.mv_size = identityKeySecret.size();
+
+    MDB_txn *txn;
+    mdb_txn_begin(env, nullptr, 0, &txn);
+    auto err = mdb_put(txn, dbiIdentityKeys, &mdbKey, &mdbValue, MDB_NOOVERWRITE);
+    if (!err) {
+        mdb_txn_commit(txn);
+        return true;
+    }
+
+    qWarning() << "could not save identity key secret:" << mdb_strerror(err);
+    mdb_txn_abort(txn);
+
+    return false;
+}
+
+std::optional<int> Database::loadActiveDeviceId() {
+    MDB_val key, value;
+
+    key.mv_data = (void *) "active";
+    key.mv_size = sizeof("active");
+
+    MDB_txn *txn;
+    mdb_txn_begin(env, nullptr, 0, &txn);
+
+    auto err = mdb_get(txn, dbiIdentityKeys, &key, &value);
+    if (err) {
+        qWarning() << "could not load active device id:" << mdb_strerror(err);
+        mdb_txn_abort(txn);
+        return std::nullopt;
+    }
+
+    if (value.mv_size != sizeof(int)) {
+        qWarning() << "mv_size is" << value.mv_size << "instead of" << sizeof(int);
+        mdb_txn_abort(txn);
+        return std::nullopt;
+    }
+
+    auto id = *reinterpret_cast<int *>(value.mv_data);
+
+    mdb_txn_abort(txn);
+
+    return id;
+}
+
+bool Database::saveActiveDeviceId(int deviceId) {
+    MDB_val key, value;
+
+    key.mv_data = (void *) "active";
+    key.mv_size = sizeof("active");
+
+    value.mv_data = &deviceId;
+    value.mv_size = sizeof(deviceId);
+
+    MDB_txn *txn;
+    mdb_txn_begin(env, nullptr, 0, &txn);
+
+    auto err = mdb_put(txn, dbiIdentityKeys, &key, &value, 0);
+    if (err) {
+        qWarning() << "could not save active device id" << mdb_strerror(err);
+        return false;
+    }
+
+    err = mdb_txn_commit(txn);
+    if (err) {
+        qWarning() << "could not save active device id" << mdb_strerror(err);
+        return false;
+    }
+
+    return true;
+}
+
+bool Database::saveIdentityKey(int deviceId, const QByteArray &identityKey) {
+    return false;
+}
+
+std::optional<QByteArray> Database::loadIdentityKey(int deviceId) {
+    return std::nullopt;
+}
+
+bool Database::containsPreKey() {
+    return false;
+}
+
+std::optional<KeyPair> Database::loadPreKey(int deviceId, int id) {
+    return std::nullopt;
+}
+
+bool Database::savePreKey(int deviceId, int id, const KeyPair &preKey) {
+    return false;
+}
+
+std::optional<Bundle> Database::loadBundle(int deviceId) {
+    Bundle result{};
+
+    auto ik = loadIdentityKey(deviceId);
+
+    result.ik = ik.value();
+
+    auto spk = loadSignedPreKey(deviceId);
+
+    result.spk = spk->key.publicKey;
+    result.spks = spk->signature;
+    result.spkId = spk->id;
+
+    // PreKeys
+
+    return result;
+}
+
+bool Database::saveBundle(int deviceId, const Bundle &bundle) {
+    return false;
+}
+
+std::optional<SignedPreKey> Database::loadSignedPreKey(int deviceId) {
+    return std::optional<SignedPreKey>();
+}
+
+bool Database::saveSignedPreKey(int deviceId, const SignedPreKey &signedPreKey) {
+    return false;
+}

qomemo/database.h

@@ -0,0 +1,56 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <QBuffer>
+#include <QString>
+#include <lmdb.h>
+
+#include "key.h"
+
+namespace QXmpp::Omemo {
+
+    class Bundle;
+
+    class Database {
+    public:
+        explicit Database(QString jid);
+        ~Database();
+        Database(const Database &) = delete;
+        Database(Database &&) = delete;
+        Database &operator=(const Database &) = delete;
+
+        // For local user
+        std::optional<int> loadActiveDeviceId();
+        bool saveActiveDeviceId(int deviceId);
+
+        std::optional<QByteArray> loadIdentityKeySecret(int deviceId);
+        bool saveIdentityKeySecret(int deviceId, const QByteArray &identityKeySecret);
+
+        std::optional<Bundle> loadBundle(int deviceId);
+        bool saveBundle(int deviceId, const Bundle& bundle);
+
+        // For any user
+        std::optional<QByteArray> loadIdentityKey(int deviceId);
+        bool saveIdentityKey(int deviceId, const QByteArray &identityKey);
+
+        bool containsPreKey();
+        std::optional<KeyPair> loadPreKey(int deviceId, int id);
+        bool savePreKey(int deviceId, int id, const KeyPair &preKey);
+
+        std::optional<SignedPreKey> loadSignedPreKey(int deviceId);
+        bool saveSignedPreKey(int deviceId, const SignedPreKey& signedPreKey);
+
+        const QString jid;
+
+    private:
+        MDB_env *env{};
+        MDB_dbi dbiDevices{};
+        MDB_dbi dbiKeys{};
+        MDB_dbi dbiPreKeys{};
+        MDB_dbi dbiIdentityKeys{};
+    };
+
+} // namespace QXmpp::Omemo

qomemo/device.cpp

@@ -0,0 +1,5 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "device.h"

qomemo/device.h

@@ -0,0 +1,25 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <QList>
+
+class QXmppElement;
+
+class QXmppIq;
+
+namespace QXmpp::Omemo {
+
+    class Device {
+    public:
+        int id;
+    };
+
+    class DeviceList {
+    public:
+        QList<Device> devices;
+    };
+
+} // namespace QXmpp::Omemo

qomemo/device_key_storage.cpp

@@ -0,0 +1,14 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "device_key_storage.h"
+#include <QRandomGenerator>
+
+int QXmpp::Omemo::DeviceKeyStorage::generateDeviceId() {
+    QRandomGenerator random{};
+
+    return 1 + random.bounded(INT32_MAX - 1);
+}
+
+QXmpp::Omemo::DeviceKeyStorage::DeviceKeyStorage(int deviceId) : deviceId(deviceId) {}

qomemo/device_key_storage.h

@@ -0,0 +1,18 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+namespace QXmpp::Omemo {
+
+    class DeviceKeyStorage {
+    public:
+        static int generateDeviceId();
+
+        explicit DeviceKeyStorage(int deviceId);
+
+        const int deviceId;
+    };
+
+} // namespace QXmpp::Omemo

qomemo/device_service.cpp

@@ -0,0 +1,35 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "device_service.h"
+#include "device.h"
+
+using namespace QXmpp::Omemo;
+
+DeviceService::DeviceService(QObject *parent) : QObject(parent) {}
+
+void DeviceService::onDeviceListReceived(const QString &jid, const QXmpp::Omemo::DeviceList &list) {
+
+    for (const auto &device : list.devices) {
+        qInfo() << "Got device for" << jid << ":" << device.id;
+    }
+}
+
+QSharedPointer<Database> DeviceService::getDatabase(const QString &jid) {
+    if (!databases.contains(jid)) {
+        databases.insert(jid, QSharedPointer<Database>::create(jid));
+    }
+
+    return databases[jid];
+}
+
+void DeviceService::addIdentity(const QString &jid, int deviceId, const QByteArray& publicKey) {
+    auto db = getDatabase(jid);
+
+    db->saveIdentityKey(deviceId, publicKey);
+}
+
+void DeviceService::onDeviceListNotFound(const QString &jid) {
+    qInfo() << "Device list not found:" << jid;
+}

qomemo/device_service.h

@@ -0,0 +1,38 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include <QBuffer>
+
+#include "qomemo.h"
+#include "user_device_list.h"
+#include "database.h"
+
+#include <QXmppClient.h>
+
+namespace QXmpp::Omemo {
+
+    class DeviceList;
+
+    class DeviceService : public QObject {
+    Q_OBJECT
+
+    public:
+        explicit DeviceService(QObject *parent);
+
+        QSharedPointer<Database> getDatabase(const QString& jid);
+
+    public slots:
+        void addIdentity(const QString& jid, int deviceId, const QByteArray& publicKey);
+
+        void onDeviceListReceived(const QString &jid, const QXmpp::Omemo::DeviceList &list);
+
+        void onDeviceListNotFound(const QString &jid);
+
+    private:
+        QMap<QString, QSharedPointer<Database>> databases{};
+    };
+
+} // namespace QXmpp::Omemo

qomemo/key.cpp

@@ -0,0 +1,6 @@
+/*
+ * Created by victoria on 2021-05-15.
+*/
+
+#include "key.h"
+ 

qomemo/key.h

@@ -0,0 +1,27 @@
+/*
+ * Created by victoria on 2021-05-15.
+*/
+
+#pragma once
+
+#include <optional>
+
+#include <QByteArray>
+
+namespace QXmpp::Omemo {
+
+    class KeyPair {
+    public:
+        QByteArray publicKey{};
+        std::optional<QByteArray> secretKey{ std::nullopt };
+    };
+
+    class SignedPreKey {
+    public:
+        int id{ 0 };
+
+        KeyPair key{};
+        QByteArray signature{};
+    };
+
+}

qomemo/qomemo.cpp

@@ -0,0 +1,94 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "qomemo.h"
+#include "sce.h"
+#include <shared/qxmppfactories.h>
+
+#include <QBuffer>
+#include <QDebug>
+#include <QDomDocument>
+
+using namespace QXmpp::Factories;
+
+QXmppElement QXmpp::Omemo::EncryptedMessage::header() const {
+    auto result = createElement("header");
+    result.setAttribute("sid", QString::number(fromDeviceId));
+
+    auto ivNode = createElement("iv");
+    ivNode.setValue(iv);
+
+    for (const auto &key : keys) {
+        result.appendChild(key.toXml());
+    }
+
+    return result;
+}
+
+QXmppElement QXmpp::Omemo::EncryptedMessage::toXml() const {
+    auto result = createElement("encrypted", "eu.siacs.conversations.axolotl");
+
+    result.appendChild(header());
+    // TODO: Payload is optional
+    result.appendChild(payload());
+
+    return result;
+}
+
+QXmppElement QXmpp::Omemo::EncryptedMessage::payload() const {
+    QBuffer buffer;
+    buffer.open(QIODevice::ReadWrite);
+    QXmlStreamWriter writer(&buffer);
+    message.toXml(&writer);
+
+    QDomDocument doc;
+    doc.setContent(buffer.data(), true);
+
+    QXmppElement root(doc.documentElement());
+    root.setTagName("payload");
+
+    return root;
+}
+
+QXmppElement QXmpp::Omemo::EncryptedMessage::content() const {
+    auto envelope = createElement("content", "urn:xmpp:sce:0");
+
+    envelope.appendChild(payload());
+
+    if (!from.isEmpty()) {
+        auto fromNode = createElement("from");
+        fromNode.setAttribute("jid", from);
+        envelope.appendChild(fromNode);
+    }
+
+    if (!to.isEmpty()) {
+        auto toNode = createElement("to");
+        toNode.setAttribute("jid", to);
+        envelope.appendChild(toNode);
+    }
+
+    if (!timestamp.isNull()) {
+        auto timeNode = createElement("time");
+        timeNode.setAttribute("stamp", timestamp.toString(Qt::DateFormat::ISODate));
+        envelope.appendChild(timeNode);
+    }
+
+    auto rpad = createElement("rpad");
+    rpad.setValue(QXmpp::Sce::generatePadding());
+    envelope.appendChild(rpad);
+
+    return envelope;
+}
+
+QXmppElement QXmpp::Omemo::MessageKey::toXml() const {
+    auto result = createElement("key");
+
+    result.setAttribute("rid", QString::number(receivingDeviceId));
+    if (prekey)
+        result.setAttribute("prekey", "true");
+
+    result.setValue(key);
+
+    return result;
+}

qomemo/qomemo.h

@@ -0,0 +1,42 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include <QXmppPubSubIq.h>
+
+#include <QDateTime>
+#include <QXmppMessage.h>
+
+namespace QXmpp::Omemo {
+
+    class MessageKey {
+    public:
+        [[nodiscard]] QXmppElement toXml() const;
+
+        int receivingDeviceId{};
+        bool prekey{};
+        QString key{};
+    };
+
+    class EncryptedMessage {
+    public:
+        [[nodiscard]] QXmppElement header() const;
+        [[nodiscard]] QXmppElement content() const;
+        [[nodiscard]] QXmppElement toXml() const;
+        [[nodiscard]] QXmppElement payload() const;
+
+        int fromDeviceId{};
+
+        QList<MessageKey> keys{};
+        QString from{};
+        QString to{};
+        QDateTime timestamp{};
+
+        QString iv{};
+
+        QXmppMessage message{};
+    };
+
+} // namespace QXmpp::Omemo

qomemo/qxmpp_omemo_manager.cpp

@@ -0,0 +1,292 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "qxmpp_omemo_manager.h"
+
+#include "qomemo/signal/context.h"
+
+#include "bundle.h"
+#include "device.h"
+#include "variant/conversations.h"
+
+#include <QDomElement>
+
+#include <QXmppClient.h>
+#include <QXmppPubSubIq.h>
+#include <iostream>
+#include <QRandomGenerator64>
+#include <external/signal-protocol-c/src/signal_protocol_internal.h>
+
+using namespace QXmpp::Omemo;
+
+Manager::Manager()
+        : deviceService{new DeviceService(this)},
+          omemoVariant(new Variant::Conversations),
+          signalContext(new Signal::Context) {
+    connect(this, &Manager::deviceListReceived, deviceService.get(), &DeviceService::onDeviceListReceived);
+    connect(this, &Manager::deviceListNotFound, deviceService.get(), &DeviceService::onDeviceListNotFound);
+    connect(this, &Manager::deviceListNotFound, this, [this](const QString &jid) {
+        if (jid == client()->configuration().jidBare())
+            generateDeviceListForSelf();
+    });
+    connect(this, &Manager::deviceListReceived, this, [this](const QString &jid, const DeviceList &currentList) {
+        if (jid == client()->configuration().jidBare())
+            generateDeviceForSelfIfNeeded(currentList);
+    });
+}
+
+bool QXmpp::Omemo::Manager::handleStanza(const QDomElement &stanza) {
+    QString str{};
+    QTextStream info(&str);
+    stanza.save(info, 4);
+
+    std::cout << str.toStdString();
+
+    if (handleDeviceList(stanza) || handleMissingDeviceList(stanza) || handleEncryptedMessage(stanza))
+        return true;
+
+    return false;
+}
+
+bool Manager::handleDeviceList(const QDomElement &stanza) {
+    if (!(stanza.tagName() == "iq"))
+        return false;
+
+    if (!(stanza.attribute("type") == "result"))
+        return false;
+
+    auto pubsub = stanza.firstChildElement("pubsub");
+    if (pubsub.isNull())
+        return false;
+
+    auto items = pubsub.firstChildElement("items");
+    if (!(items.attribute("node") == omemoVariant->getDeviceListNode()))
+        return false;
+
+    auto deviceList = omemoVariant->latestDeviceListFromPubSubNode(items);
+    if (!deviceList.has_value())
+        return false;
+
+    emit deviceListReceived(stanza.attribute("from"), deviceList.value());
+
+    return true;
+}
+
+bool Manager::handleMissingDeviceList(const QDomElement &stanza) {
+    if (stanza.tagName() != "iq")
+        return false;
+
+    if (stanza.attribute("type") != "error")
+        return false;
+
+    auto pubsub = stanza.firstChildElement("pubsub");
+    if (pubsub.isNull())
+        return false;
+
+    auto items = pubsub.firstChildElement("items");
+    if (items.attribute("node") != omemoVariant->getDeviceListNode())
+        return false;
+
+    auto error = stanza.firstChildElement("error");
+
+    if (error.namespaceURI() != "jabber:client" || error.attribute("code") != "404")
+        return false;
+
+    qDebug() << "Got 404 deviceList for" << stanza.attribute("from");
+    emit deviceListNotFound(stanza.attribute("from"));
+
+    return true;
+}
+
+bool Manager::handleEncryptedMessage(const QDomElement &stanza) {
+    if (stanza.tagName() != "message")
+        return false;
+
+    auto encrypted = stanza.firstChildElement("encrypted");
+    if (encrypted.isNull())
+        return false;
+
+    qDebug() << "!!!! Got encrypted message!!";
+
+    return true;
+}
+
+void QXmpp::Omemo::Manager::setClient(QXmppClient *client) {
+    QXmppClientExtension::setClient(client);
+
+    if (!client)
+        return;
+
+    QObject::connect(client, &QXmppClient::connected, this,
+                     &Manager::fetchOwnDevices);
+}
+
+void QXmpp::Omemo::Manager::fetchOwnDevices() {
+    QXmppPubSubIq iq{};
+    iq.setFrom(client()->configuration().jid());
+    iq.setTo(client()->configuration().jidBare());
+    iq.setType(QXmppIq::Get);
+    iq.setQueryNode(omemoVariant->getDeviceListNode());
+
+    client()->sendPacket(iq);
+}
+
+QSharedPointer<DeviceService> Manager::getDeviceService() {
+    return deviceService;
+}
+
+void Manager::publishDeviceList(const DeviceList &deviceList) {
+//    QXmppPubSubIq iq{};
+//    iq.setFrom(client()->configuration().jid());
+//    iq.setType(QXmppIq::Set);
+//    iq.setQueryNode(omemoVariant->getDeviceListNode());
+//    iq.setItems()
+
+    auto iq = omemoVariant->deviceListSetIq(deviceList);
+    iq.setFrom(client()->configuration().jid());
+
+    QString str{};
+    QXmlStreamWriter info(&str);
+    iq.toXml(&info);
+    qInfo() << str;
+
+    client()->sendPacket(iq);
+}
+
+void Manager::generateDeviceListForSelf() {
+    qInfo() << "Generate device for self...";
+
+    generateDeviceForSelfIfNeeded(DeviceList());
+}
+
+void Manager::publishBundle(int deviceId, const Bundle &bundle) {
+    auto iq = omemoVariant->bundleSetIq(deviceId, bundle);
+    iq.setFrom(client()->configuration().jid());
+
+    QString str{};
+    QXmlStreamWriter info(&str);
+    iq.toXml(&info);
+    qInfo() << str;
+
+    client()->sendPacket(iq);
+}
+
+void Manager::generateDeviceForSelfIfNeeded(const DeviceList &currentList) {
+    auto db = deviceService->getDatabase(client()->configuration().jidBare());
+    auto activeId = db->loadActiveDeviceId();
+
+    if (activeId.has_value()) {
+        qInfo() << "Current device:" << *activeId;
+
+        bool found = false;
+        for (const auto &d : currentList.devices)
+            if (d.id == *activeId)
+                found = true;
+
+        if (found)
+            return;
+
+        qInfo() << "Could not find device" << *activeId << ", generating new one";
+    }
+
+    qInfo() << "Generating device";
+
+    auto deviceId = QRandomGenerator64::system()->bounded(INT32_MAX);
+    db->saveActiveDeviceId(deviceId);
+
+    Device device{};
+    device.id = deviceId;
+
+    auto updatedList = currentList;
+
+
+    updatedList.devices.push_back(device);
+    publishDeviceList(updatedList);
+
+    auto bundle = generateAndSaveBundle(deviceId);
+    publishBundle(deviceId, bundle);
+}
+
+Bundle Manager::generateAndSaveBundle(int deviceId) {
+    auto database = deviceService->getDatabase(client()->configuration().jidBare());
+    Bundle result{};
+
+    ec_key_pair *ecKeyPair;
+    curve_generate_key_pair(signalContext->temporaryGetContextUnsafeForRawAccessThatNeedsToBeWrapped(), &ecKeyPair);
+
+    signal_buffer *ecPublic;
+    ec_public_key_serialize(&ecPublic, ec_key_pair_get_public(ecKeyPair));
+
+    signal_buffer *ecSecret;
+    ec_private_key_serialize(&ecSecret, ec_key_pair_get_private(ecKeyPair));
+
+    QByteArray identityKey((const char *) signal_buffer_const_data(ecPublic), (int) signal_buffer_len(ecPublic));
+    QByteArray identityKeySecret((const char *) signal_buffer_const_data(ecSecret), (int) signal_buffer_len(ecSecret));
+
+    database->saveIdentityKey(deviceId, identityKey);
+    database->saveIdentityKeySecret(deviceId, identityKeySecret);
+
+    result.ik = identityKey;
+
+    // Generate SPK
+    ec_key_pair *ecSpk;
+    curve_generate_key_pair(signalContext->temporaryGetContextUnsafeForRawAccessThatNeedsToBeWrapped(), &ecSpk);
+    signal_buffer *spkPublic, *spkSecret;
+    ec_public_key_serialize(&spkPublic, ec_key_pair_get_public(ecSpk));
+    ec_private_key_serialize(&spkSecret, ec_key_pair_get_private(ecSpk));
+
+    // Generate SPKs
+    signal_buffer *signature;
+    curve_calculate_signature(signalContext->temporaryGetContextUnsafeForRawAccessThatNeedsToBeWrapped(), &signature,
+                              ec_key_pair_get_private(ecKeyPair), signal_buffer_const_data(spkPublic),
+                              signal_buffer_len(spkPublic));
+
+    SignedPreKey spk{};
+    spk.id = 1;
+    spk.key.publicKey = QByteArray((const char *) signal_buffer_const_data(spkPublic), (int) signal_buffer_len(spkPublic));
+    spk.key.secretKey = QByteArray((const char *) signal_buffer_const_data(spkSecret), (int) signal_buffer_len(spkSecret));
+    spk.signature = QByteArray((const char *) signal_buffer_const_data(signature), (int) signal_buffer_len(signature));
+
+    result.spk = spk.key.publicKey;
+    result.spks = spk.signature;
+    result.spkId = 1;
+
+    // Generate 100 PK
+    for (auto i = 1; i <= 100; ++i) {
+        ec_key_pair *currentPreKey;
+        curve_generate_key_pair(signalContext->temporaryGetContextUnsafeForRawAccessThatNeedsToBeWrapped(), &currentPreKey);
+
+        signal_buffer *pkPublic, *pkSecret;
+        ec_public_key_serialize(&pkPublic, ec_key_pair_get_public(currentPreKey));
+        ec_private_key_serialize(&pkSecret, ec_key_pair_get_private(currentPreKey));
+
+        KeyPair preKey{};
+        preKey.publicKey = QByteArray((const char *) signal_buffer_const_data(pkPublic), (int) signal_buffer_len(pkPublic));
+        preKey.secretKey = QByteArray((const char *) signal_buffer_const_data(pkSecret), (int) signal_buffer_len(pkSecret));
+
+        database->savePreKey(deviceId, i, preKey);
+
+        PreKey pk{};
+        pk.data = preKey.publicKey;
+        pk.id = i;
+
+        result.prekeys.append(pk);
+
+        signal_buffer_free(pkPublic);
+        signal_buffer_free(pkSecret);
+        SIGNAL_UNREF(currentPreKey);
+    }
+
+    signal_buffer_free(signature);
+
+    signal_buffer_free(ecPublic);
+    signal_buffer_free(ecSecret);
+    SIGNAL_UNREF(ecKeyPair);
+
+    signal_buffer_free(spkPublic);
+    signal_buffer_free(spkSecret);
+    SIGNAL_UNREF(ecSpk);
+
+    return result;
+}

qomemo/qxmpp_omemo_manager.h

@@ -0,0 +1,64 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include "device_service.h"
+#include "qomemo.h"
+#include "variant/omemo_base.h"
+
+#include <memory>
+#include <QXmppClientExtension.h>
+
+namespace Signal {
+    class Context;
+}
+
+namespace QXmpp::Omemo {
+
+    class Manager : public QXmppClientExtension {
+    Q_OBJECT;
+
+    public:
+        Manager();
+        ~Manager() override = default;
+
+        bool handleStanza(const QDomElement &stanza) override;
+
+        bool handleDeviceList(const QDomElement& stanza);
+
+        bool handleMissingDeviceList(const QDomElement& stanza);
+
+        bool handleEncryptedMessage(const QDomElement& stanza);
+
+        QSharedPointer<DeviceService> getDeviceService();
+
+        Bundle generateAndSaveBundle(int deviceId);
+
+    public slots:
+        void fetchOwnDevices();
+
+        void publishDeviceList(const QXmpp::Omemo::DeviceList& deviceList);
+
+        void generateDeviceListForSelf();
+
+        void generateDeviceForSelfIfNeeded(const QXmpp::Omemo::DeviceList &currentList);
+
+        void publishBundle(int deviceId, const QXmpp::Omemo::Bundle& bundle);
+
+    signals:
+        void deviceListReceived(const QString &jid, const QXmpp::Omemo::DeviceList &list);
+
+        void deviceListNotFound(const QString &jid);
+
+    protected:
+        void setClient(QXmppClient *client) override;
+
+    private:
+        QSharedPointer<DeviceService> deviceService;
+        QScopedPointer<Variant::Base> omemoVariant;
+        std::shared_ptr<Signal::Context> signalContext;
+    };
+
+} // namespace QXmpp::Omemo

qomemo/sce.cpp

@@ -0,0 +1,26 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "sce.h"
+
+#include <QRandomGenerator>
+
+#define RPAD_ALPHABET "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
+
+constexpr int RPAD_MAX_LENGTH = 200;
+
+QString QXmpp::Sce::generatePadding() {
+    QRandomGenerator random{};
+    QString result{};
+    QString alphabet{QStringLiteral(RPAD_ALPHABET)};
+
+    auto length = random.bounded(RPAD_MAX_LENGTH);
+    result.resize(length);
+
+    for (auto i = 0; i < length; ++i) {
+        result[i] = alphabet[random.bounded(alphabet.length())];
+    }
+
+    return result;
+}

qomemo/sce.h

@@ -0,0 +1,14 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include <QDateTime>
+#include <QXmppElement.h>
+
+namespace QXmpp::Sce {
+
+    QString generatePadding();
+
+}

qomemo/signal/CMakeLists.txt

@@ -0,0 +1,9 @@
+target_sources(squawk PRIVATE
+        context.cpp
+        context.h
+        util.cpp
+        util.h
+        )
+
+add_subdirectory(crypto)
+add_subdirectory(stores)

qomemo/signal/context.cpp

@@ -0,0 +1,28 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "context.h"
+#include "crypto/crypto.h"
+
+using namespace Signal;
+
+Context::Context() : cryptoProvider{ Signal::Crypto::createProvider() } {
+    signal_context_create(&ctx, nullptr);
+    signal_context_set_crypto_provider(ctx, &cryptoProvider);
+}
+
+Context::~Context() {
+    signal_context_destroy(ctx);
+}
+
+std::unique_ptr<Crypto::ECKeyPair> Context::generateCurveKeyPair() {
+    auto result = std::unique_ptr<Crypto::ECKeyPair>();
+    // TODO
+
+    return result;
+}
+
+signal_context *Context::temporaryGetContextUnsafeForRawAccessThatNeedsToBeWrapped() {
+    return ctx;
+}

qomemo/signal/context.h

@@ -0,0 +1,32 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include "crypto/ec.h"
+
+#include <memory>
+
+#include <signal/signal_protocol.h>
+
+namespace Signal {
+
+    class Context {
+    public:
+        Context();
+        ~Context();
+        Context(const Context &) = delete;
+        Context(Context &&) = delete;
+        Context &operator=(const Context &) = delete;
+
+        std::unique_ptr<Crypto::ECKeyPair> generateCurveKeyPair();
+
+        signal_context *temporaryGetContextUnsafeForRawAccessThatNeedsToBeWrapped();
+
+    private:
+        signal_crypto_provider cryptoProvider{};
+        signal_context *ctx{nullptr};
+    };
+
+} // namespace Signal

qomemo/signal/crypto/CMakeLists.txt

@@ -0,0 +1,12 @@
+target_sources(squawk PRIVATE
+        aes_openssl.cpp
+        aes_openssl.h
+        crypto.cpp
+        crypto.h
+        hmac_sha256_openssl.cpp
+        hmac_sha256_openssl.h
+        sha512_digest_openssl.cpp
+        sha512_digest_openssl.h
+        ec.cpp
+        ec.h
+        )

qomemo/signal/crypto/aes_openssl.cpp

@@ -0,0 +1,187 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "aes_openssl.h"
+#include <memory>
+
+extern "C" {
+#include <openssl/evp.h>
+#include <openssl/opensslv.h>
+}
+
+using namespace Signal::Crypto;
+
+class EVPCipherCtxWrapper {
+public:
+    EVPCipherCtxWrapper() {
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
+        ctx = EVP_CIPHER_CTX_new();
+#else
+        ctx = new EVP_CIPHER_CTX;
+        EVP_CIPHER_CTX_init(ctx);
+#endif
+    }
+
+    ~EVPCipherCtxWrapper() {
+        if (good()) {
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
+            EVP_CIPHER_CTX_free(ctx);
+#else
+            EVP_CIPHER_CTX_cleanup(ctx);
+            delete ctx;
+#endif
+        }
+    }
+
+    EVPCipherCtxWrapper(const EVPCipherCtxWrapper &) = delete;
+    EVPCipherCtxWrapper(EVPCipherCtxWrapper &&) = delete;
+    EVPCipherCtxWrapper &operator=(const EVPCipherCtxWrapper &) = delete;
+
+    [[nodiscard]] bool good() const { return ctx != nullptr; }
+
+    [[nodiscard]] EVP_CIPHER_CTX *operator*() const { return ctx; }
+
+private:
+    EVP_CIPHER_CTX *ctx{nullptr};
+};
+
+static const EVP_CIPHER *aes_cipher(int cipher, size_t key_len) {
+    if (cipher == SG_CIPHER_AES_CBC_PKCS5) {
+        if (key_len == 16) {
+            return EVP_aes_128_cbc();
+        } else if (key_len == 24) {
+            return EVP_aes_192_cbc();
+        } else if (key_len == 32) {
+            return EVP_aes_256_cbc();
+        }
+    } else if (cipher == SG_CIPHER_AES_CTR_NOPADDING) {
+        if (key_len == 16) {
+            return EVP_aes_128_ctr();
+        } else if (key_len == 24) {
+            return EVP_aes_192_ctr();
+        } else if (key_len == 32) {
+            return EVP_aes_256_ctr();
+        }
+    }
+    return nullptr;
+}
+
+int Aes::encrypt(signal_buffer **output, int cipher, const uint8_t *key, size_t key_len, const uint8_t *iv,
+                 size_t iv_len, const uint8_t *plaintext, size_t plaintext_len, void *) {
+    const EVP_CIPHER *evp_cipher = aes_cipher(cipher, key_len);
+    if (!evp_cipher) {
+        fprintf(stderr, "invalid AES mode or key size: %zu\n", key_len);
+        return SG_ERR_UNKNOWN;
+    }
+
+    if (iv_len != 16) {
+        fprintf(stderr, "invalid AES IV size: %zu\n", iv_len);
+        return SG_ERR_UNKNOWN;
+    }
+
+    if (plaintext_len > INT_MAX - EVP_CIPHER_block_size(evp_cipher)) {
+        fprintf(stderr, "invalid plaintext length: %zu\n", plaintext_len);
+        return SG_ERR_UNKNOWN;
+    }
+
+    EVPCipherCtxWrapper ctx{};
+    if (!ctx.good()) {
+        fprintf(stderr, "could not create context\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    auto result = EVP_EncryptInit_ex(*ctx, evp_cipher, nullptr, key, iv);
+    if (!result) {
+        fprintf(stderr, "cannot initialize cipher\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    if (cipher == SG_CIPHER_AES_CTR_NOPADDING) {
+        result = EVP_CIPHER_CTX_set_padding(*ctx, 0);
+        if (!result) {
+            fprintf(stderr, "cannot set padding\n");
+            return SG_ERR_UNKNOWN;
+        }
+    }
+
+    auto out_buf = std::make_unique<uint8_t>(plaintext_len + EVP_CIPHER_block_size(evp_cipher));
+
+    int out_len = 0;
+    result = EVP_EncryptUpdate(*ctx, out_buf.get(), &out_len, plaintext,
+                               plaintext_len);
+    if (!result) {
+        fprintf(stderr, "cannot encrypt plaintext\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    int final_len = 0;
+    result = EVP_EncryptFinal_ex(*ctx, out_buf.get() + out_len, &final_len);
+    if (!result) {
+        fprintf(stderr, "cannot finish encrypting plaintext\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    *output = signal_buffer_create(out_buf.get(), out_len + final_len);
+
+    return result;
+}
+
+int Aes::decrypt(signal_buffer **output, int cipher, const uint8_t *key, size_t key_len, const uint8_t *iv,
+                 size_t iv_len, const uint8_t *ciphertext, size_t ciphertext_len, void *) {
+    const EVP_CIPHER *evp_cipher = aes_cipher(cipher, key_len);
+    if (!evp_cipher) {
+        fprintf(stderr, "invalid AES mode or key size: %zu\n", key_len);
+        return SG_ERR_INVAL;
+    }
+
+    if (iv_len != 16) {
+        fprintf(stderr, "invalid AES IV size: %zu\n", iv_len);
+        return SG_ERR_INVAL;
+    }
+
+    if (ciphertext_len > INT_MAX - EVP_CIPHER_block_size(evp_cipher)) {
+        fprintf(stderr, "invalid ciphertext length: %zu\n", ciphertext_len);
+        return SG_ERR_UNKNOWN;
+    }
+
+    EVPCipherCtxWrapper ctx{};
+    if (!ctx.good()) {
+        fprintf(stderr, "could not create context\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    auto result = EVP_DecryptInit_ex(*ctx, evp_cipher, nullptr, key, iv);
+    if (!result) {
+        fprintf(stderr, "cannot initialize cipher\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    if (cipher == SG_CIPHER_AES_CTR_NOPADDING) {
+        result = EVP_CIPHER_CTX_set_padding(*ctx, 0);
+        if (!result) {
+            fprintf(stderr, "cannot set padding\n");
+            return SG_ERR_UNKNOWN;
+        }
+    }
+
+    auto out_buf = std::make_unique<uint8_t>(ciphertext_len + EVP_CIPHER_block_size(evp_cipher));
+
+    int out_len = 0;
+    result = EVP_DecryptUpdate(*ctx, out_buf.get(), &out_len, ciphertext, ciphertext_len);
+    if (!result) {
+        fprintf(stderr, "cannot decrypt ciphertext\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    int final_len = 0;
+    result = EVP_DecryptFinal_ex(*ctx, out_buf.get() + out_len, &final_len);
+    if (!result) {
+        fprintf(stderr, "cannot finish decrypting ciphertext\n");
+        return SG_ERR_UNKNOWN;
+    }
+
+    *output = signal_buffer_create(out_buf.get(), out_len + final_len);
+
+    return result;
+}

qomemo/signal/crypto/aes_openssl.h

@@ -0,0 +1,17 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Crypto::Aes {
+
+    int encrypt(signal_buffer **output, int cipher, const uint8_t *key, size_t key_len, const uint8_t *iv,
+                size_t iv_len, const uint8_t *plaintext, size_t plaintext_len, void *user_data);
+
+    int decrypt(signal_buffer **output, int cipher, const uint8_t *key, size_t key_len, const uint8_t *iv,
+                size_t iv_len, const uint8_t *ciphertext, size_t ciphertext_len, void *user_data);
+
+} // namespace Signal::Crypto::Aes

qomemo/signal/crypto/crypto.cpp

@@ -0,0 +1,40 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "crypto.h"
+
+extern "C" {
+#include <openssl/rand.h>
+}
+
+#include "aes_openssl.h"
+#include "hmac_sha256_openssl.h"
+#include "sha512_digest_openssl.h"
+
+int random_func(uint8_t *data, size_t len, void *) {
+    if (RAND_bytes(data, len)) {
+        return 0;
+    } else {
+        return SG_ERR_UNKNOWN;
+    }
+}
+
+signal_crypto_provider Signal::Crypto::createProvider() {
+    signal_crypto_provider result{};
+
+    result.random_func = random_func;
+    result.hmac_sha256_init_func = HmacSha256::init;
+    result.hmac_sha256_update_func = HmacSha256::update;
+    result.hmac_sha256_final_func = HmacSha256::final;
+    result.hmac_sha256_cleanup_func = HmacSha256::cleanup;
+    result.sha512_digest_init_func = Sha512::init;
+    result.sha512_digest_update_func = Sha512::update;
+    result.sha512_digest_final_func = Sha512::final;
+    result.sha512_digest_cleanup_func = Sha512::cleanup;
+    result.encrypt_func = Aes::encrypt;
+    result.decrypt_func = Aes::decrypt;
+    result.user_data = nullptr;
+
+    return result;
+}

qomemo/signal/crypto/crypto.h

@@ -0,0 +1,13 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Crypto {
+
+    signal_crypto_provider createProvider();
+
+}

qomemo/signal/crypto/ec.cpp

@@ -0,0 +1,5 @@
+/*
+ * Created by victoria on 2021-06-17.
+*/
+
+#include "ec.h"

qomemo/signal/crypto/ec.h

@@ -0,0 +1,20 @@
+/*
+ * Created by victoria on 2021-06-17.
+*/
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Crypto {
+
+    class ECKeyPair {
+    public:
+        ECKeyPair();
+        ~ECKeyPair();
+
+    private:
+        ec_key_pair *ec;
+    };
+
+}

qomemo/signal/crypto/hmac_sha256_openssl.cpp

@@ -0,0 +1,71 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "hmac_sha256_openssl.h"
+
+extern "C" {
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+#include <openssl/sha.h>
+}
+
+using namespace Signal::Crypto;
+
+int HmacSha256::init(void **hmac_context, const uint8_t *key, size_t key_len, void *) {
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
+    HMAC_CTX *ctx = HMAC_CTX_new();
+    if (!ctx) {
+        return SG_ERR_NOMEM;
+    }
+#else
+    auto ctx = new HMAC_CTX;
+    HMAC_CTX_init(ctx);
+#endif
+
+    *hmac_context = ctx;
+
+    if (HMAC_Init_ex(ctx, key, key_len, EVP_sha256(), nullptr) != 1) {
+        return SG_ERR_UNKNOWN;
+    }
+
+    return SG_SUCCESS;
+}
+
+int HmacSha256::update(void *hmac_context, const uint8_t *data, size_t data_len, void *) {
+    auto ctx = static_cast<HMAC_CTX *>(hmac_context);
+    int result = HMAC_Update(ctx, data, data_len);
+
+    return (result == 1) ? SG_SUCCESS : SG_ERR_UNKNOWN;
+}
+
+int HmacSha256::final(void *hmac_context, signal_buffer **output, void *) {
+    auto ctx = static_cast<HMAC_CTX *>(hmac_context);
+    unsigned char md[EVP_MAX_MD_SIZE];
+    unsigned int len = 0;
+
+    if (HMAC_Final(ctx, md, &len) != 1) {
+        return SG_ERR_UNKNOWN;
+    }
+
+    signal_buffer *output_buffer = signal_buffer_create(md, len);
+    if (!output_buffer) {
+        return SG_ERR_NOMEM;
+    }
+
+    *output = output_buffer;
+
+    return SG_SUCCESS;
+}
+
+void HmacSha256::cleanup(void *hmac_context, void *) {
+    if (hmac_context) {
+        auto ctx = static_cast<HMAC_CTX *>(hmac_context);
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
+        HMAC_CTX_free(ctx);
+#else
+        HMAC_CTX_cleanup(ctx);
+        delete ctx;
+#endif
+    }
+}

qomemo/signal/crypto/hmac_sha256_openssl.h

@@ -0,0 +1,16 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Crypto::HmacSha256 {
+
+    int init(void **hmac_context, const uint8_t *key, size_t key_len, void *);
+    int update(void *hmac_context, const uint8_t *data, size_t data_len, void *);
+    int final(void *hmac_context, signal_buffer **output, void *);
+    void cleanup(void *hmac_context, void *);
+
+} // namespace Signal::Crypto::HmacSha256

qomemo/signal/crypto/sha512_digest_openssl.cpp

@@ -0,0 +1,67 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "sha512_digest_openssl.h"
+
+extern "C" {
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/sha.h>
+}
+
+using namespace Signal::Crypto;
+
+int Sha512::init(void **digest_context, void *) {
+    auto ctx = EVP_MD_CTX_create();
+    if (!ctx) {
+        return SG_ERR_NOMEM;
+    }
+
+    auto result = EVP_DigestInit_ex(ctx, EVP_sha512(), nullptr);
+
+    if (result == 1) {
+        *digest_context = ctx;
+        return SG_SUCCESS;
+    }
+
+    EVP_MD_CTX_destroy(ctx);
+    return SG_ERR_UNKNOWN;
+}
+
+int Sha512::update(void *digest_context, const uint8_t *data, size_t data_len, void *) {
+    auto ctx = static_cast<EVP_MD_CTX *>(digest_context);
+    auto result = EVP_DigestUpdate(ctx, data, data_len);
+
+    return (result == 1) ? SG_SUCCESS : SG_ERR_UNKNOWN;
+}
+
+int Sha512::final(void *digest_context, signal_buffer **output, void *) {
+    auto ctx = static_cast<EVP_MD_CTX *>(digest_context);
+    unsigned char md[EVP_MAX_MD_SIZE];
+    unsigned int len = 0;
+
+    auto result = EVP_DigestFinal_ex(ctx, md, &len);
+    if (result != 1) {
+        return SG_ERR_UNKNOWN;
+    }
+
+    result = EVP_DigestInit_ex(ctx, EVP_sha512(), nullptr);
+    if (result != 1) {
+        return SG_ERR_UNKNOWN;
+    }
+
+    signal_buffer *output_buffer = signal_buffer_create(md, len);
+    if (!output_buffer) {
+        return SG_ERR_NOMEM;
+    }
+
+    *output = output_buffer;
+
+    return SG_SUCCESS;
+}
+
+void Sha512::cleanup(void *digest_context, void *) {
+    auto ctx = static_cast<EVP_MD_CTX *>(digest_context);
+    EVP_MD_CTX_destroy(ctx);
+}

qomemo/signal/crypto/sha512_digest_openssl.h

@@ -0,0 +1,16 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Crypto::Sha512 {
+
+    int init(void **digest_context, void *);
+    int update(void *digest_context, const uint8_t *data, size_t data_len, void *);
+    int final(void *digest_context, signal_buffer **output, void *);
+    void cleanup(void *digest_context, void *);
+
+} // namespace Signal::Crypto::Sha512

qomemo/signal/stores/CMakeLists.txt

@@ -0,0 +1,14 @@
+target_sources(squawk PRIVATE
+        identity_key_store.cpp
+        identity_key_store.h
+        pre_key_store.cpp
+        pre_key_store.h
+        sender_key_store.cpp
+        sender_key_store.h
+        session_store.cpp
+        session_store.h
+        signed_pre_key_store.cpp
+        signed_pre_key_store.h
+        store_context.cpp
+        store_context.h
+        )

qomemo/signal/stores/identity_key_store.cpp

@@ -0,0 +1,70 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "identity_key_store.h"
+
+#include "qomemo/signal/util.h"
+#include <utility>
+
+Signal::Store::IdentityKeyStore::IdentityKeyStore(QXmpp::Omemo::DeviceService &deviceService, QString jid, int deviceId)
+        : jid(std::move(jid)), deviceId(deviceId), deviceService(deviceService) {
+    database = deviceService.getDatabase(jid);
+}
+
+int Signal::Store::IdentityKeyStore::getIdentityKeyPair(signal_buffer **public_data, signal_buffer **private_data) {
+    auto pk = database->loadIdentityKey(deviceId);
+    auto sk = database->loadIdentityKeySecret(deviceId);
+
+    *public_data = signal_buffer_create(reinterpret_cast<const uint8_t *>(pk->data()), pk->size());
+    *private_data = signal_buffer_create(reinterpret_cast<const uint8_t *>(sk->data()), sk->size());
+
+    return 0;
+}
+
+int Signal::Store::IdentityKeyStore::getLocalRegistrationId(uint32_t *registration_id) {
+    // TODO: Figure out what registration id is used for
+    *registration_id = 1;
+
+    return 0;
+}
+
+int Signal::Store::IdentityKeyStore::saveIdentity(const signal_protocol_address *address, uint8_t *key_data,
+                                                  size_t key_len) {
+    auto identityJid = Signal::Util::jidFromAddress(address);
+    auto identityKey = Signal::Util::byteArray(key_data, key_len);
+
+    deviceService.getDatabase(identityJid)->saveIdentityKey(address->device_id, identityKey);
+
+    return 0;
+}
+
+int Signal::Store::IdentityKeyStore::isTrustedIdentity(const signal_protocol_address *address, uint8_t *key_data,
+                                                       size_t key_len) {
+    auto identityJid = Signal::Util::jidFromAddress(address);
+    auto actualIdentityKey = deviceService.getDatabase(identityJid)->loadIdentityKey(address->device_id);
+
+    if (!actualIdentityKey.has_value()) {
+        return 1;
+    }
+
+    auto givenIdentityKey = Signal::Util::byteArray(key_data, key_len);
+
+    return givenIdentityKey == actualIdentityKey ? 1 : 0;
+}
+
+void Signal::Store::IdentityKeyStore::fillCallbacks(signal_protocol_identity_key_store &store) {
+    store.get_identity_key_pair = [](signal_buffer **public_data, signal_buffer **private_data, void *ptr) {
+        return static_cast<IdentityKeyStore *>(ptr)->getIdentityKeyPair(public_data, private_data);
+    };
+    store.get_local_registration_id = [](void *ptr, uint32_t *registrationId) {
+        return static_cast<IdentityKeyStore *>(ptr)->getLocalRegistrationId(registrationId);
+    };
+    store.is_trusted_identity = [](const signal_protocol_address *address, uint8_t *key_data, size_t key_len,
+                                   void *ptr) {
+        return static_cast<IdentityKeyStore *>(ptr)->isTrustedIdentity(address, key_data, key_len);
+    };
+    store.save_identity = [](const signal_protocol_address *address, uint8_t *key_data, size_t key_len, void *ptr) {
+        return static_cast<IdentityKeyStore *>(ptr)->saveIdentity(address, key_data, key_len);
+    };
+}

qomemo/signal/stores/identity_key_store.h

@@ -0,0 +1,32 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+#include "qomemo/device_service.h"
+
+namespace Signal::Store {
+
+    class IdentityKeyStore {
+    public:
+        IdentityKeyStore(QXmpp::Omemo::DeviceService &deviceService, QString jid, int deviceId);
+
+        int getIdentityKeyPair(signal_buffer **public_data, signal_buffer **private_data);
+        int getLocalRegistrationId(uint32_t *registration_id);
+        int saveIdentity(const signal_protocol_address *address, uint8_t *key_data, size_t key_len);
+        int isTrustedIdentity(const signal_protocol_address *address, uint8_t *key_data, size_t key_len);
+
+        void fillCallbacks(signal_protocol_identity_key_store &store);
+
+        const QString jid;
+        const int deviceId;
+
+    private:
+        QXmpp::Omemo::DeviceService &deviceService;
+        QSharedPointer<QXmpp::Omemo::Database> database;
+    };
+
+} // namespace Signal::Store

qomemo/signal/stores/pre_key_store.cpp

@@ -0,0 +1,38 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "pre_key_store.h"
+
+Signal::Store::PreKeyStore::PreKeyStore(QSharedPointer<QXmpp::Omemo::Database> database) : database(
+        std::move(database)) {}
+
+int Signal::Store::PreKeyStore::containsPreKey(uint32_t pre_key_id) {
+    return 0;
+}
+
+int Signal::Store::PreKeyStore::loadPreKey(signal_buffer **record, uint32_t pre_key_id) {
+    return 0;
+}
+
+int Signal::Store::PreKeyStore::storePreKey(uint32_t pre_key_id, uint8_t *record, size_t record_len) {
+    return 0;
+}
+
+int Signal::Store::PreKeyStore::removePreKey(uint32_t pre_key_id) { return 0; }
+
+void Signal::Store::PreKeyStore::fillCallbacks(signal_protocol_pre_key_store &store) {
+    store.contains_pre_key = [](uint32_t id, void *ptr) {
+        return static_cast<PreKeyStore *>(ptr)->containsPreKey(id);
+    };
+    store.load_pre_key = [](signal_buffer **record, uint32_t id, void *ptr) {
+        return static_cast<PreKeyStore *>(ptr)->loadPreKey(record, id);
+    };
+    store.remove_pre_key = [](uint32_t id, void *ptr) {
+        return static_cast<PreKeyStore *>(ptr)->removePreKey(id);
+    };
+    store.store_pre_key = [](uint32_t id, uint8_t *record, size_t size,
+                             void *ptr) {
+        return static_cast<PreKeyStore *>(ptr)->storePreKey(id, record, size);
+    };
+}

qomemo/signal/stores/pre_key_store.h

@@ -0,0 +1,28 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+#include "qomemo/device_service.h"
+
+namespace Signal::Store {
+
+    class PreKeyStore {
+    public:
+        explicit PreKeyStore(QSharedPointer<QXmpp::Omemo::Database> database);
+
+        int containsPreKey(uint32_t pre_key_id);
+        int loadPreKey(signal_buffer **record, uint32_t pre_key_id);
+        int storePreKey(uint32_t pre_key_id, uint8_t *record, size_t record_len);
+        int removePreKey(uint32_t pre_key_id);
+
+        void fillCallbacks(signal_protocol_pre_key_store &store);
+
+    private:
+        QSharedPointer<QXmpp::Omemo::Database> database;
+    };
+
+} // namespace Signal::Store

qomemo/signal/stores/sender_key_store.cpp

@@ -0,0 +1,30 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "sender_key_store.h"
+
+int Signal::Store::SenderKeyStore::loadSenderKey(signal_buffer **record, signal_buffer **user_record,
+                                                 const signal_protocol_sender_key_name *sender_key_name) {
+    return 0;
+}
+
+int Signal::Store::SenderKeyStore::storeSenderKey(const signal_protocol_sender_key_name *sender_key_name,
+                                                  uint8_t *record, size_t record_len, uint8_t *user_record,
+                                                  size_t user_record_len) {
+    return 0;
+}
+
+void Signal::Store::SenderKeyStore::fillCallbacks(signal_protocol_sender_key_store &store) {
+    store.user_data = nullptr;
+    store.destroy_func = nullptr;
+    store.load_sender_key = [](signal_buffer **record, signal_buffer **user_record,
+                               const signal_protocol_sender_key_name *sender_key_name, void *ptr) {
+        return static_cast<SenderKeyStore *>(ptr)->loadSenderKey(record, user_record, sender_key_name);
+    };
+    store.store_sender_key = [](const signal_protocol_sender_key_name *sender_key_name, uint8_t *record,
+                                size_t record_len, uint8_t *user_record, size_t user_record_len, void *ptr) {
+        return static_cast<SenderKeyStore *>(ptr)->storeSenderKey(sender_key_name, record, record_len, user_record,
+                                                                  user_record_len);
+    };
+}

qomemo/signal/stores/sender_key_store.h

@@ -0,0 +1,21 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Store {
+
+    class SenderKeyStore {
+    public:
+        int storeSenderKey(const signal_protocol_sender_key_name *sender_key_name, uint8_t *record, size_t record_len,
+                           uint8_t *user_record, size_t user_record_len);
+        int loadSenderKey(signal_buffer **record, signal_buffer **user_record,
+                          const signal_protocol_sender_key_name *sender_key_name);
+
+        void fillCallbacks(signal_protocol_sender_key_store &store);
+    };
+
+} // namespace Signal::Store

qomemo/signal/stores/session_store.cpp

@@ -0,0 +1,57 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "session_store.h"
+
+int Signal::Store::SessionStore::loadSession(signal_buffer **record, signal_buffer **user_record,
+                                             const signal_protocol_address *address) {
+    return 0;
+}
+
+int Signal::Store::SessionStore::getSubDeviceSessions(signal_int_list **sessions, const char *name, size_t name_len) {
+    return 0;
+}
+
+int Signal::Store::SessionStore::storeSession(const signal_protocol_address *address, uint8_t *record,
+                                              size_t record_len, uint8_t *user_record, size_t user_record_len) {
+    return 0;
+}
+
+int Signal::Store::SessionStore::containsSession(const signal_protocol_address *address) {
+    return 0;
+}
+
+int Signal::Store::SessionStore::deleteSession(const signal_protocol_address *address) {
+    return 0;
+}
+
+int Signal::Store::SessionStore::deleteAllSessions(const char *name, size_t name_len) {
+    return 0;
+}
+
+void Signal::Store::SessionStore::fillCallbacks(signal_protocol_session_store &store) {
+    store.user_data = nullptr;
+    store.destroy_func = nullptr;
+    store.load_session_func = [](signal_buffer **record, signal_buffer **user_record,
+                                 const signal_protocol_address *address, void *ptr) {
+        return static_cast<SessionStore *>(ptr)->loadSession(record, user_record, address);
+    };
+    store.get_sub_device_sessions_func = [](signal_int_list **sessions, const char *name, size_t name_len, void *ptr) {
+        return static_cast<SessionStore *>(ptr)->getSubDeviceSessions(sessions, name, name_len);
+    };
+    store.store_session_func = [](const signal_protocol_address *address, uint8_t *record, size_t record_len,
+                                  uint8_t *user_record, size_t user_record_len, void *ptr) {
+        return static_cast<SessionStore *>(ptr)->storeSession(address, record, record_len, user_record,
+                                                              user_record_len);
+    };
+    store.contains_session_func = [](const signal_protocol_address *address, void *ptr) {
+        return static_cast<SessionStore *>(ptr)->containsSession(address);
+    };
+    store.delete_session_func = [](const signal_protocol_address *address, void *ptr) {
+        return static_cast<SessionStore *>(ptr)->deleteSession(address);
+    };
+    store.delete_all_sessions_func = [](const char *name, size_t name_len, void *ptr) {
+        return static_cast<SessionStore *>(ptr)->deleteAllSessions(name, name_len);
+    };
+}

qomemo/signal/stores/session_store.h

@@ -0,0 +1,24 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Store {
+
+    class SessionStore {
+    public:
+        int loadSession(signal_buffer **record, signal_buffer **user_record, const signal_protocol_address *address);
+        int getSubDeviceSessions(signal_int_list **sessions, const char *name, size_t name_len);
+        int storeSession(const signal_protocol_address *address, uint8_t *record, size_t record_len,
+                         uint8_t *user_record, size_t user_record_len);
+        int containsSession(const signal_protocol_address *address);
+        int deleteSession(const signal_protocol_address *address);
+        int deleteAllSessions(const char *name, size_t name_len);
+
+        void fillCallbacks(signal_protocol_session_store &store);
+    };
+
+} // namespace Signal::Store

qomemo/signal/stores/signed_pre_key_store.cpp

@@ -0,0 +1,43 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "signed_pre_key_store.h"
+
+int Signal::Store::SignedPreKeyStore::loadSignedPreKey(signal_buffer **record, uint32_t signed_pre_key_id) {
+    return 0;
+}
+
+int
+Signal::Store::SignedPreKeyStore::storeSignedPreKey(uint32_t signed_pre_key_id, uint8_t *record, size_t record_len) {
+    return 0;
+}
+
+int Signal::Store::SignedPreKeyStore::containsSignedPreKey(uint32_t signed_pre_key_id) {
+    return 0;
+}
+
+int Signal::Store::SignedPreKeyStore::removeSignedPreKey(uint32_t signed_pre_key_id) {
+    return 0;
+}
+
+void Signal::Store::SignedPreKeyStore::fillCallbacks(signal_protocol_signed_pre_key_store &store) {
+    store.user_data = nullptr;
+    store.destroy_func = nullptr;
+    store.load_signed_pre_key = [](signal_buffer **record, uint32_t signed_pre_key_id, void *ptr) {
+        return static_cast<SignedPreKeyStore *>(ptr)->loadSignedPreKey(
+                record, signed_pre_key_id);
+    };
+    store.store_signed_pre_key = [](uint32_t signed_pre_key_id, uint8_t *record, size_t record_len, void *ptr) {
+        return static_cast<SignedPreKeyStore *>(ptr)->storeSignedPreKey(
+                signed_pre_key_id, record, record_len);
+    };
+    store.contains_signed_pre_key = [](uint32_t signed_pre_key_id, void *ptr) {
+        return static_cast<SignedPreKeyStore *>(ptr)->containsSignedPreKey(
+                signed_pre_key_id);
+    };
+    store.remove_signed_pre_key = [](uint32_t signed_pre_key_id, void *ptr) {
+        return static_cast<SignedPreKeyStore *>(ptr)->removeSignedPreKey(
+                signed_pre_key_id);
+    };
+}

qomemo/signal/stores/signed_pre_key_store.h

@@ -0,0 +1,21 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Store {
+
+    class SignedPreKeyStore {
+    public:
+        int loadSignedPreKey(signal_buffer **record, uint32_t signed_pre_key_id);
+        int storeSignedPreKey(uint32_t signed_pre_key_id, uint8_t *record, size_t record_len);
+        int containsSignedPreKey(uint32_t signed_pre_key_id);
+        int removeSignedPreKey(uint32_t signed_pre_key_id);
+
+        void fillCallbacks(signal_protocol_signed_pre_key_store &store);
+    };
+
+} // namespace Signal::Store

qomemo/signal/stores/store_context.cpp

@@ -0,0 +1,25 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "store_context.h"
+
+Signal::Store::Context::Context(signal_context *global) : identityKeyStore(), preKeyStore(), senderKeyStore(), sessionStore(), signedPreKeyStore() {
+    signal_protocol_store_context_create(&ctx, global);
+
+    identityKeyStore->fillCallbacks(iks);
+    preKeyStore->fillCallbacks(pks);
+    senderKeyStore->fillCallbacks(sks);
+    sessionStore->fillCallbacks(ss);
+    signedPreKeyStore->fillCallbacks(spks);
+
+    signal_protocol_store_context_set_identity_key_store(ctx, &iks);
+    signal_protocol_store_context_set_pre_key_store(ctx, &pks);
+    signal_protocol_store_context_set_sender_key_store(ctx, &sks);
+    signal_protocol_store_context_set_session_store(ctx, &ss);
+    signal_protocol_store_context_set_signed_pre_key_store(ctx, &spks);
+}
+
+Signal::Store::Context::~Context() {
+    signal_protocol_store_context_destroy(ctx);
+}

qomemo/signal/stores/store_context.h

@@ -0,0 +1,42 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+#include "identity_key_store.h"
+#include "pre_key_store.h"
+#include "sender_key_store.h"
+#include "session_store.h"
+#include "signed_pre_key_store.h"
+
+namespace Signal::Store {
+
+    class Context {
+    public:
+        explicit Context(signal_context *global);
+        ~Context();
+
+        Context(const Context &) = delete;
+        Context(Context &&) = delete;
+        Context &operator=(const Context &) = delete;
+
+    private:
+        signal_protocol_store_context *ctx{nullptr};
+
+        signal_protocol_identity_key_store iks{};
+        signal_protocol_pre_key_store pks{};
+        signal_protocol_sender_key_store sks{};
+        signal_protocol_session_store ss{};
+        signal_protocol_signed_pre_key_store spks{};
+
+        std::unique_ptr<IdentityKeyStore> identityKeyStore;
+        std::unique_ptr<PreKeyStore> preKeyStore;
+        std::unique_ptr<SenderKeyStore> senderKeyStore;
+        std::unique_ptr<SessionStore> sessionStore;
+        std::unique_ptr<SignedPreKeyStore> signedPreKeyStore;
+    };
+
+} // namespace Signal::Store

qomemo/signal/util.cpp

@@ -0,0 +1,14 @@
+/*
+ * Created by victoria on 2021-05-15.
+*/
+
+#include "util.h"
+
+QString Signal::Util::jidFromAddress(const signal_protocol_address *address) {
+    // TODO: Validate this
+    return QString::fromRawData(reinterpret_cast<const QChar *>(address->name), static_cast<int>(address->name_len));
+}
+
+QByteArray Signal::Util::byteArray(const uint8_t *data, size_t len) {
+    return QByteArray::fromRawData(reinterpret_cast<const char *>(data), static_cast<int>(len));
+}

qomemo/signal/util.h

@@ -0,0 +1,18 @@
+/*
+ * Created by victoria on 2021-05-15.
+*/
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+#include <QString>
+#include <QByteArray>
+
+namespace Signal::Util {
+
+    QString jidFromAddress(const signal_protocol_address *address);
+
+    QByteArray byteArray(const uint8_t *data, size_t len);
+
+}

qomemo/user_device_list.cpp

@@ -0,0 +1,9 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "user_device_list.h"
+
+#include <utility>
+
+QXmpp::Omemo::UserDeviceList::UserDeviceList(QString jid) : jid(std::move(jid)) {}

qomemo/user_device_list.h

@@ -0,0 +1,18 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include <QString>
+
+namespace QXmpp::Omemo {
+
+    class UserDeviceList {
+    public:
+        explicit UserDeviceList(QString jid);
+
+        const QString jid;
+    };
+
+} // namespace QXmpp::Omemo

qomemo/variant/CMakeLists.txt

@@ -0,0 +1 @@
+target_sources(squawk PRIVATE xep0384.cpp xep0384.h conversations.cpp conversations.h omemo_base.cpp omemo_base.h)

qomemo/variant/conversations.cpp

@@ -0,0 +1,205 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "conversations.h"
+
+#include "qomemo/bundle.h"
+#include "qomemo/device.h"
+#include "shared/qxmppfactories.h"
+
+#include <QDebug>
+#include <QXmppIq.h>
+#include <QXmppPubSubIq.h>
+
+using namespace QXmpp::Omemo;
+using namespace QXmpp::Factories;
+
+QXmppElement Variant::Conversations::deviceToXml(const Device &device) {
+    auto result = createElement("device");
+    result.setAttribute("id", QString::number(device.id));
+
+    return result;
+}
+
+Device Variant::Conversations::deviceFromXml(const QXmppElement &xml) {
+    Device result{};
+
+    if (!elementMatches(xml, "device"))
+        return result;
+
+    result.id = xml.attribute("id").toInt();
+
+    return result;
+}
+
+QXmppElement
+Variant::Conversations::deviceListToXml(const DeviceList &deviceList) {
+    auto element = createElement("list", "eu.siacs.conversations.axolotl");
+
+    for (const auto &device : deviceList.devices) {
+        element.appendChild(deviceToXml(device));
+    }
+
+    return element;
+}
+
+std::optional<DeviceList> Variant::Conversations::latestDeviceListFromPubSubNode(const QXmppElement &items) {
+    auto item = items.firstChildElement("item");
+    if (item.isNull())
+        return std::nullopt;
+
+    auto list = item.firstChildElement("list");
+    if (list.isNull())
+        return std::nullopt;
+
+    if (!elementMatches(list, "list", "eu.siacs.conversations.axolotl"))
+        return std::nullopt;
+
+    DeviceList result{};
+
+    auto deviceElement = list.firstChildElement("device");
+    while (!deviceElement.isNull()) {
+        result.devices.push_back(deviceFromXml(deviceElement));
+        deviceElement = deviceElement.nextSiblingElement("device");
+    }
+
+    return result;
+}
+
+QXmppIq Variant::Conversations::deviceListSetIq(const DeviceList &deviceList) {
+    QXmppIq iq{};
+
+    iq.setType(QXmppIq::Set);
+
+    auto item = createElement("item");
+    item.appendChild(deviceListToXml(deviceList));
+
+    auto publish = createElement("publish");
+    publish.setAttribute("node", getDeviceListNode());
+    publish.appendChild(item);
+
+    auto pubSub = createElement("pubsub", "http://jabber.org/protocol/pubsub");
+    pubSub.appendChild(publish);
+    pubSub.appendChild(createOpenPublishOptions());
+
+    iq.setExtensions({ pubSub });
+
+    return iq;
+}
+
+QString Variant::Conversations::getDeviceListNode() const {
+    return "eu.siacs.conversations.axolotl.devicelist";
+}
+
+QXmppIq Variant::Conversations::bundleSetIq(int deviceId, const Bundle &bundle) {
+    QXmppIq iq{};
+
+    iq.setType(QXmppIq::Set);
+
+    auto item = createElement("item");
+    item.appendChild(bundleToXml(bundle));
+
+    auto publish = createElement("publish");
+    publish.setAttribute(
+            "node",
+            QString("eu.siacs.conversations.axolotl.bundles:%1").arg(deviceId));
+    publish.appendChild(item);
+
+    auto pubSub = createElement("pubsub", "http://jabber.org/protocol/pubsub");
+    pubSub.appendChild(publish);
+    pubSub.appendChild(createOpenPublishOptions());
+
+    iq.setExtensions({ pubSub });
+
+    return iq;
+}
+
+QXmppElement Variant::Conversations::bundleToXml(const Bundle &bundle) {
+    auto spkNode = createElement("signedPreKeyPublic");
+    spkNode.setAttribute("signedPreKeyId", QString::number(bundle.spkId));
+    spkNode.setValue(bundle.spk.toBase64());
+
+    auto spksNode = createElement("signedPreKeySignature");
+    spksNode.setValue(bundle.spks.toBase64());
+
+    auto ikNode = createElement("identityKey");
+    ikNode.setValue(bundle.ik.toBase64());
+
+    auto prekeysNode = createElement("prekeys");
+    for (const auto &pk : bundle.prekeys) {
+        prekeysNode.appendChild(preKeyToXml(pk));
+    }
+
+    auto result = createElement("bundle", "eu.siacs.conversations.axolotl");
+    result.appendChild(spkNode);
+    result.appendChild(spksNode);
+    result.appendChild(ikNode);
+    result.appendChild(prekeysNode);
+
+    return result;
+}
+
+QXmppElement Variant::Conversations::preKeyToXml(const PreKey &pk) {
+    auto x = createElement("preKeyPublic");
+    x.setAttribute("preKeyId", QString::number(pk.id));
+    x.setValue(pk.data.toBase64());
+
+    return x;
+}
+
+std::optional<PreKey> Variant::Conversations::preKeyFromXml(const QXmppElement &xml) {
+    if (!elementMatches(xml, "preKeyPublic"))
+        return std::nullopt;
+
+    auto pk = PreKey();
+    pk.id = xml.attribute("preKeyId").toInt();
+    pk.data = QByteArray::fromBase64Encoding(xml.value().toUtf8()).decoded;
+
+    return pk;
+}
+
+std::optional<Bundle> Variant::Conversations::bundleFromXml(const QXmppElement &xml) {
+    if (!elementMatches(xml, "bundle", "eu.siacs.conversations.axolotl"))
+        return std::nullopt;
+
+    auto spkNode = xml.firstChildElement("signedPreKeyPublic");
+    if (spkNode.isNull()) {
+        qWarning() << "'bundle': missing 'signedPreKeyPublic'";
+        return std::nullopt;
+    }
+
+    Bundle result{};
+
+    result.spk = QByteArray::fromBase64Encoding(spkNode.value().toUtf8()).decoded;
+    result.spkId = spkNode.attribute("signedPreKeyId").toInt();
+
+    auto spksNode = xml.firstChildElement("signedPreKeySignature");
+    if (spksNode.isNull()) {
+        qWarning() << "'bundle': missing 'signedPreKeySignature'";
+        return std::nullopt;
+    }
+
+    result.spks = QByteArray::fromBase64Encoding(spksNode.value().toUtf8()).decoded;
+
+    auto ikNode = xml.firstChildElement("identityKey");
+    if (ikNode.isNull()) {
+        qWarning() << "'bundle': missing 'identityKey'";
+        return std::nullopt;
+    }
+
+    result.ik = QByteArray::fromBase64Encoding(ikNode.value().toUtf8()).decoded;
+
+    auto prekeysNode = xml.firstChildElement("prekeys");
+    auto pkNode = prekeysNode.firstChildElement("preKeyPublic");
+
+    result.prekeys.clear();
+    while (!pkNode.isNull()) {
+        auto maybePk = preKeyFromXml(pkNode);
+        if (maybePk)
+            result.prekeys.push_back(*maybePk);
+        pkNode = pkNode.nextSiblingElement("preKeyPublic");
+    }
+
+    return result;
+}

qomemo/variant/conversations.h

@@ -0,0 +1,32 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include "omemo_base.h"
+
+namespace QXmpp::Omemo::Variant {
+
+    class Conversations : public Base {
+    public:
+        ~Conversations() override = default;
+
+        QXmppElement deviceToXml(const Device &device) override;
+        Device deviceFromXml(const QXmppElement &xml) override;
+
+        [[nodiscard]] QString getDeviceListNode() const override;
+        QXmppElement deviceListToXml(const DeviceList &deviceList) override;
+        std::optional<DeviceList> latestDeviceListFromPubSubNode(const QXmppElement &items) override;
+        QXmppIq deviceListSetIq(const DeviceList &deviceList) override;
+
+        QXmppElement preKeyToXml(const PreKey &pk) override;
+        std::optional<PreKey> preKeyFromXml(const QXmppElement &xml) override;
+
+        QXmppElement bundleToXml(const Bundle &bundle) override;
+        std::optional<Bundle> bundleFromXml(const QXmppElement &xml) override;
+
+        QXmppIq bundleSetIq(int deviceId, const Bundle &bundle) override;
+    };
+
+} // namespace QXmpp::Omemo::Variant

qomemo/variant/omemo_base.cpp

@@ -0,0 +1,5 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "omemo_base.h"

qomemo/variant/omemo_base.h

@@ -0,0 +1,45 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <optional>
+
+class QString;
+class QXmppElement;
+class QXmppIq;
+
+namespace QXmpp::Omemo {
+
+    class PreKey;
+    class Bundle;
+    class Device;
+    class DeviceList;
+
+    namespace Variant {
+
+        class Base {
+        public:
+            virtual ~Base() = default;
+
+            virtual QXmppElement deviceToXml(const Device &device) = 0;
+            virtual Device deviceFromXml(const QXmppElement &xml) = 0;
+
+            [[nodiscard]] virtual QString getDeviceListNode() const = 0;
+            virtual QXmppElement deviceListToXml(const DeviceList &deviceList) = 0;
+            virtual std::optional<DeviceList> latestDeviceListFromPubSubNode(const QXmppElement &xml) = 0;
+            virtual QXmppIq deviceListSetIq(const DeviceList &deviceList) = 0;
+
+            virtual QXmppElement preKeyToXml(const PreKey &pk) = 0;
+            virtual std::optional<PreKey> preKeyFromXml(const QXmppElement &xml) = 0;
+
+            virtual QXmppElement bundleToXml(const Bundle& bundle) = 0;
+            virtual std::optional<Bundle> bundleFromXml(const QXmppElement& xml) = 0;
+
+            virtual QXmppIq bundleSetIq(int deviceId, const Bundle& bundle) = 0;
+        };
+
+    } // namespace Variant
+
+} // namespace QXmpp::Omemo

qomemo/variant/xep0384.cpp

@@ -0,0 +1,5 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#include "xep0384.h"

qomemo/variant/xep0384.h

@@ -0,0 +1,7 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+namespace QXmpp::Omemo {}

shared/CMakeLists.txt

@@ -16,4 +16,6 @@ target_sources(squawk PRIVATE
   utils.h
   vcard.cpp
   vcard.h
+  qxmppfactories.cpp
+  qxmppfactories.h
   )

shared/qxmppfactories.cpp

@@ -0,0 +1,75 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "qxmppfactories.h"
+
+#include <QDebug>
+
+bool QXmpp::Factories::elementMatches(const QXmppElement &element,
+                                      const QString &tagName,
+                                      const QString &xmlns) {
+  if (element.tagName() != tagName) {
+    qWarning() << "tag name: expected = " << tagName
+               << ", got = " << element.tagName();
+    return false;
+  }
+
+  if (!xmlns.isEmpty() && element.attribute("xmlns") != xmlns) {
+    qWarning() << "xmlns: expected = " << xmlns
+               << ", got = " << element.attribute("xmlns");
+    return false;
+  }
+
+  return true;
+}
+
+QXmppElement QXmpp::Factories::createElement(const QString &tagName,
+                                             const QString &xmlns) {
+  QXmppElement el{};
+  el.setTagName(tagName);
+
+  if (!xmlns.isEmpty())
+    el.setAttribute("xmlns", xmlns);
+
+  return el;
+}
+
+QXmppElement QXmpp::Factories::createValue(const QString &value) {
+  auto el = createElement("value");
+  el.setValue(value);
+
+  return el;
+}
+
+QXmppElement QXmpp::Factories::createField(const QString &key,
+                                           const QString &value, bool hidden) {
+  auto field = createElement("field");
+  field.setAttribute("var", key);
+  if (hidden)
+    field.setAttribute("type", "hidden");
+  field.appendChild(createValue(value));
+
+  return field;
+}
+
+QXmppElement
+QXmpp::Factories::createOpenPublishOptions(const QString &maxItems) {
+  auto formType = createField(
+      "FORM_TYPE", "http://jabber.org/protocol/pubsub#publish-options", true);
+  auto accessModel = createField("pubsub#access_model", "open");
+
+  auto x = createElement("x", "jabber:x:data");
+  x.setAttribute("type", "submit");
+
+  x.appendChild(formType);
+  x.appendChild(accessModel);
+
+  if (!maxItems.isEmpty())
+    x.appendChild(createField("pubsub#max_items", maxItems));
+
+  auto publishOptions = createElement("publish-options");
+  publishOptions.appendChild(x);
+
+  return publishOptions;
+}

shared/qxmppfactories.h

@@ -0,0 +1,25 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include <QXmppElement.h>
+
+namespace QXmpp::Factories {
+
+bool elementMatches(const QXmppElement &element, const QString &tagName,
+                    const QString &xmlns = QStringLiteral(""));
+
+QXmppElement createElement(const QString &tagName,
+                           const QString &xmlns = QStringLiteral(""));
+
+QXmppElement createValue(const QString &value);
+
+QXmppElement createField(const QString &key, const QString &value,
+                         bool hidden = false);
+
+QXmppElement
+createOpenPublishOptions(const QString &maxItems = QStringLiteral(""));
+
+} // namespace QXmpp::Factories

ui/CMakeLists.txt

@@ -3,3 +3,4 @@ target_sources(squawk PRIVATE squawk.cpp squawk.h squawk.ui)
 add_subdirectory(models)
 add_subdirectory(utils)
 add_subdirectory(widgets)
+add_subdirectory(omemo)

ui/omemo/CMakeLists.txt

@@ -0,0 +1,8 @@
+target_sources(squawk PRIVATE
+        contactsettings.cpp
+        contactsettings.h
+        contactsettings.ui
+        omemodevices.cpp
+        omemodevices.h
+        omemodevices.ui
+        )

ui/omemo/contactsettings.cpp

@@ -0,0 +1,25 @@
+/*
+ * Created by victoria on 2021-05-15.
+*/
+
+#include "contactsettings.h"
+#include "ui_contactsettings.h"
+#include "omemodevices.h"
+
+ContactSettings::ContactSettings(QString jid, QWidget *parent)
+        : QDialog(parent), jid(std::move(jid)), m_ui(new Ui::ContactSettings()) {
+    m_ui->setupUi(this);
+
+    connect(m_ui->devicesButton, &QPushButton::clicked, this, &ContactSettings::openDeviceList);
+
+    setWindowTitle(QString("Encryption settings for %1").arg(this->jid));
+}
+
+ContactSettings::~ContactSettings() {}
+
+void ContactSettings::openDeviceList() {
+    auto devices = new OMEMODevices(jid, this);
+
+    devices->setAttribute(Qt::WA_DeleteOnClose);
+    devices->show();
+}

ui/omemo/contactsettings.h

@@ -0,0 +1,26 @@
+/*
+ * Created by victoria on 2021-05-15.
+*/
+
+#pragma once
+
+#include <QDialog>
+
+namespace Ui {
+    class ContactSettings;
+}
+
+class ContactSettings : public QDialog {
+    Q_OBJECT
+public:
+    explicit ContactSettings(QString jid, QWidget *parent = nullptr);
+    ~ContactSettings() override;
+
+    const QString jid;
+
+private slots:
+    void openDeviceList();
+
+private:
+    QScopedPointer<Ui::ContactSettings> m_ui;
+};

ui/omemo/contactsettings.ui

@@ -0,0 +1,144 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ContactSettings</class>
+ <widget class="QDialog" name="ContactSettings">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Contact Settings</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Settings for foo@example.com</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QFrame" name="frame">
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Raised</enum>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_2">
+      <item>
+       <widget class="QWidget" name="widget" native="true">
+        <layout class="QHBoxLayout" name="horizontalLayout">
+         <property name="spacing">
+          <number>0</number>
+         </property>
+         <property name="leftMargin">
+          <number>0</number>
+         </property>
+         <property name="topMargin">
+          <number>0</number>
+         </property>
+         <property name="rightMargin">
+          <number>0</number>
+         </property>
+         <property name="bottomMargin">
+          <number>0</number>
+         </property>
+         <item>
+          <widget class="QCheckBox" name="useOmemoCheckBox">
+           <property name="text">
+            <string>Use OMEMO</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <spacer name="horizontalSpacer">
+           <property name="orientation">
+            <enum>Qt::Horizontal</enum>
+           </property>
+           <property name="sizeHint" stdset="0">
+            <size>
+             <width>40</width>
+             <height>20</height>
+            </size>
+           </property>
+          </spacer>
+         </item>
+         <item>
+          <widget class="QPushButton" name="devicesButton">
+           <property name="text">
+            <string>Devices...</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <spacer name="verticalSpacer">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>ContactSettings</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>ContactSettings</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

ui/omemo/omemodevices.cpp

@@ -0,0 +1,15 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#include "omemodevices.h"
+#include "ui_omemodevices.h"
+
+OMEMODevices::OMEMODevices(QString jid, QWidget *parent)
+        : QDialog(parent), jid(std::move(jid)), m_ui(new Ui::OMEMODevices()) {
+    m_ui->setupUi(this);
+
+    setWindowTitle(QString("%1's OMEMO devices").arg(this->jid));
+}
+
+OMEMODevices::~OMEMODevices() {}

ui/omemo/omemodevices.h

@@ -0,0 +1,23 @@
+/*
+ * Created by victoria on 2021-05-12.
+ */
+
+#pragma once
+
+#include <QDialog>
+
+namespace Ui {
+    class OMEMODevices;
+}
+
+class OMEMODevices : public QDialog {
+    Q_OBJECT
+public:
+    explicit OMEMODevices(QString jid, QWidget *parent = nullptr);
+    ~OMEMODevices() override;
+
+    const QString jid;
+
+private:
+    QScopedPointer<Ui::OMEMODevices> m_ui;
+};

ui/omemo/omemodevices.ui

@@ -0,0 +1,508 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>OMEMODevices</class>
+ <widget class="QDialog" name="OMEMODevices">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>560</width>
+    <height>357</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>OMEMO Devices</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QLabel" name="label_5">
+     <property name="text">
+      <string>List of OMEMO fingerprints for fooooo@bar.com</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QScrollArea" name="scrollArea">
+     <property name="widgetResizable">
+      <bool>true</bool>
+     </property>
+     <widget class="QWidget" name="scrollAreaWidgetContents">
+      <property name="geometry">
+       <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>540</width>
+        <height>281</height>
+       </rect>
+      </property>
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <item>
+        <widget class="QFrame" name="frame_3">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="styleSheet">
+          <string notr="true">background-color: rgb(6, 88, 6)</string>
+         </property>
+         <property name="frameShape">
+          <enum>QFrame::Panel</enum>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Raised</enum>
+         </property>
+         <layout class="QHBoxLayout" name="horizontalLayout_3">
+          <item>
+           <widget class="QLabel" name="label_6">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>240</width>
+              <height>0</height>
+             </size>
+            </property>
+            <property name="font">
+             <font>
+              <family>Monospace</family>
+              <pointsize>8</pointsize>
+             </font>
+            </property>
+            <property name="text">
+             <string>1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd</string>
+            </property>
+            <property name="textFormat">
+             <enum>Qt::PlainText</enum>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="label_7">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>Squawk</string>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_6">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="view-barcode-qr">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_9">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="approved">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_10">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="edit-delete-remove">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QFrame" name="frame_2">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="frameShape">
+          <enum>QFrame::Panel</enum>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Raised</enum>
+         </property>
+         <layout class="QHBoxLayout" name="horizontalLayout_2">
+          <item>
+           <widget class="QLabel" name="label_3">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>240</width>
+              <height>0</height>
+             </size>
+            </property>
+            <property name="font">
+             <font>
+              <family>Monospace</family>
+              <pointsize>8</pointsize>
+             </font>
+            </property>
+            <property name="text">
+             <string>1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd</string>
+            </property>
+            <property name="textFormat">
+             <enum>Qt::PlainText</enum>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="label_4">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>Dino</string>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_5">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="view-barcode-qr">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_7">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="approved">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_8">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="edit-delete-remove">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QFrame" name="frame">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="autoFillBackground">
+          <bool>false</bool>
+         </property>
+         <property name="styleSheet">
+          <string notr="true">background: rgb(111, 47, 47)</string>
+         </property>
+         <property name="frameShape">
+          <enum>QFrame::Panel</enum>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Raised</enum>
+         </property>
+         <property name="lineWidth">
+          <number>1</number>
+         </property>
+         <layout class="QHBoxLayout" name="horizontalLayout">
+          <item>
+           <widget class="QLabel" name="label_2">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Minimum">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>240</width>
+              <height>0</height>
+             </size>
+            </property>
+            <property name="font">
+             <font>
+              <family>Monospace</family>
+              <pointsize>8</pointsize>
+             </font>
+            </property>
+            <property name="text">
+             <string>1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd 1234abcd</string>
+            </property>
+            <property name="textFormat">
+             <enum>Qt::PlainText</enum>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="label">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>Conversations</string>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_4">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="view-barcode-qr">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton_2">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="approved">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pushButton">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset theme="edit-delete-remove">
+              <normaloff>.</normaloff>.</iconset>
+            </property>
+            <property name="flat">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Close</set>
+     </property>
+     <property name="centerButtons">
+      <bool>false</bool>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>OMEMODevices</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>OMEMODevices</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

ui/squawk.cpp

@@ -20,6 +20,8 @@
 #include "ui_squawk.h"
 #include <QDebug>
 #include <QIcon>
+#include <utility>
+#include <ui/omemo/omemodevices.h>
 
 Squawk::Squawk(QWidget *parent) :
     QMainWindow(parent),
@@ -60,7 +62,7 @@ Squawk::Squawk(QWidget *parent) :
     connect(m_ui->roster, &QTreeView::collapsed, this, &Squawk::onItemCollepsed);
     connect(m_ui->roster->selectionModel(), &QItemSelectionModel::currentRowChanged, this, &Squawk::onRosterSelectionChanged);
     connect(&rosterModel, &Models::Roster::unnoticedMessage, this, &Squawk::onUnnoticedMessage);
-    
+
     connect(rosterModel.accountsModel, &Models::Accounts::sizeChanged, this, &Squawk::onAccountsSizeChanged);
     connect(&rosterModel, &Models::Roster::requestArchive, this, &Squawk::onRequestArchive);
     connect(&rosterModel, &Models::Roster::fileDownloadRequest, this, &Squawk::fileDownloadRequest);
@@ -134,6 +136,13 @@ void Squawk::onNewContact()
     nc->exec();
 }
 
+void Squawk::openDeviceList(QString bareJid) {
+  auto od = new OMEMODevices(std::move(bareJid), this);
+
+  od->setAttribute(Qt::WA_DeleteOnClose);
+  od->show();
+}
+
 void Squawk::onNewConference()
 {
     JoinConference* jc = new JoinConference(rosterModel.accountsModel, this);
@@ -530,6 +539,10 @@ void Squawk::onRosterContextMenu(const QPoint& point)
                         emit connectAccount(name);
                     });
                 }
+
+                QAction* devices = contextMenu->addAction(Shared::icon("security-high"), tr("Devices"));
+                devices->setEnabled(active);
+                connect(devices, &QAction::triggered, [this, acc]() { openDeviceList(acc->getBareJid()); });
                 
                 QAction* card = contextMenu->addAction(Shared::icon("user-properties"), tr("VCard"));
                 card->setEnabled(active);

ui/squawk.h

@@ -155,6 +155,7 @@ private slots:
     void onPasswordPromptRejected();
     void onRosterSelectionChanged(const QModelIndex& current, const QModelIndex& previous);
     void onContextAboutToHide();
+    void openDeviceList(QString bareJid);
     
     void onUnnoticedMessage(const QString& account, const Shared::Message& msg);
     

ui/squawk.ui

@@ -162,7 +162,7 @@
      <x>0</x>
      <y>0</y>
      <width>718</width>
-     <height>27</height>
+     <height>23</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuSettings">
@@ -224,6 +224,15 @@
     <string>Add conference</string>
    </property>
   </action>
+  <action name="actionDeviceList">
+   <property name="icon">
+    <iconset theme="computer-laptop">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Device list</string>
+   </property>
+  </action>
  </widget>
  <resources/>
  <connections/>

ui/widgets/conversation.cpp

@@ -27,6 +27,7 @@
 #include <unistd.h>
 #include <QAbstractTextDocumentLayout>
 #include <QCoreApplication>
+#include <ui/omemo/contactsettings.h>
 
 Conversation::Conversation(bool muc, Models::Account* acc, Models::Element* el, const QString pJid, const QString pRes, QWidget* parent):
     QWidget(parent),
@@ -80,7 +81,8 @@ Conversation::Conversation(bool muc, Models::Account* acc, Models::Element* el,
     connect(m_ui->clearButton, &QPushButton::clicked, this, &Conversation::onClearButton);
     connect(m_ui->messageEditor->document()->documentLayout(), &QAbstractTextDocumentLayout::documentSizeChanged, 
             this, &Conversation::onTextEditDocSizeChanged);
-    
+    connect(m_ui->encryptionButton, &QToolButton::clicked, this, &Conversation::openEncryptionSettings);
+
     m_ui->messageEditor->installEventFilter(&ker);
     
     
@@ -433,3 +435,10 @@ void Conversation::onFeedContext(const QPoint& pos)
         }
     }
 }
+
+void Conversation::openEncryptionSettings() {
+    auto cs = new ContactSettings(palJid, this);
+
+    cs->setAttribute(Qt::WA_DeleteOnClose);
+    cs->show();
+}

ui/widgets/conversation.h

@@ -107,6 +107,7 @@ protected slots:
     void onFeedMessage(const Shared::Message& msg);
     void positionShadow();
     void onFeedContext(const QPoint &pos);
+    void openEncryptionSettings();
     
 public:
     const bool isMuc;

ui/widgets/conversation.ui

@@ -292,6 +292,20 @@
            </property>
           </spacer>
          </item>
+         <item>
+          <widget class="QToolButton" name="encryptionButton">
+           <property name="text">
+            <string/>
+           </property>
+           <property name="icon">
+            <iconset theme="security-low">
+             <normaloff>.</normaloff>.</iconset>
+           </property>
+           <property name="autoRaise">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
          <item>
           <widget class="QPushButton" name="attachButton">
            <property name="text">
@@ -400,8 +414,8 @@ background-color: transparent
          <string>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Liberation Sans'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Noto Sans'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Liberation Sans';&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
         </property>
         <property name="acceptRichText">
          <bool>false</bool>