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diff --git a/lib/crypto/qolmoutboundsession.h b/lib/crypto/qolmoutboundsession.h
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+// SPDX-FileCopyrightText: 2021 Carl Schwan <carlschwan@kde.org>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+#pragma once
+#ifdef Quotient_E2EE_ENABLED
+
+#include "olm/olm.h" // from Olm
+#include "crypto/errors.h"
+#include "crypto/e2ee.h"
+#include <memory>
+
+namespace Quotient {
+
+
+//! An out-bound group session is responsible for encrypting outgoing
+//! communication in a Megolm session.
+class QOlmOutboundGroupSession
+{
+public:
+    ~QOlmOutboundGroupSession();
+    //! Creates a new instance of `QOlmOutboundGroupSession`.
+    //! Throw OlmError on errors
+    static std::unique_ptr<QOlmOutboundGroupSession> create();
+    //! Serialises an `QOlmOutboundGroupSession` to encrypted Base64.
+    std::variant<QByteArray, OlmError> pickle(const PicklingMode &mode);
+    //! Deserialises from encrypted Base64 that was previously obtained by
+    //! pickling a `QOlmOutboundGroupSession`.
+    static std::variant<std::unique_ptr<QOlmOutboundGroupSession>, OlmError> unpickle(QByteArray &pickled, const PicklingMode &mode);
+    //! Encrypts a plaintext message using the session.
+    std::variant<QByteArray, OlmError> encrypt(const QString &plaintext);
+
+    //! Get the current message index for this session.
+    //!
+    //! Each message is sent with an increasing index; this returns the
+    //! index for the next message.
+    uint32_t sessionMessageIndex() const;
+
+    //! Get a base64-encoded identifier for this session.
+    QByteArray sessionId() const;
+
+    //! Get the base64-encoded current ratchet key for this session.
+    //!
+    //! Each message is sent with a different ratchet key. This function returns the
+    //! ratchet key that will be used for the next message.
+    std::variant<QByteArray, OlmError> sessionKey() const;
+    QOlmOutboundGroupSession(OlmOutboundGroupSession *groupSession);
+private:
+    OlmOutboundGroupSession *m_groupSession;
+};
+
+using QOlmOutboundGroupSessionPtr = std::unique_ptr<QOlmOutboundGroupSession>;
+using OlmOutboundGroupSessionPtr = std::unique_ptr<OlmOutboundGroupSession>;
+}
+#endif