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diff --git a/lib/crypto/qolminboundsession.h b/lib/crypto/qolminboundsession.h
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+++ b/lib/crypto/qolminboundsession.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 <QByteArray>
+#include <variant>
+#include <memory>
+#include "olm/olm.h"
+#include "crypto/errors.h"
+#include "crypto/e2ee.h"
+
+namespace Quotient {
+
+//! An in-bound group session is responsible for decrypting incoming
+//! communication in a Megolm session.
+struct QOlmInboundGroupSession
+{
+public:
+    ~QOlmInboundGroupSession();
+    //! Creates a new instance of `OlmInboundGroupSession`.
+    static std::unique_ptr<QOlmInboundGroupSession> create(const QByteArray &key);
+    //! Import an inbound group session, from a previous export.
+    static std::unique_ptr<QOlmInboundGroupSession> import(const QByteArray &key);
+    //! Serialises an `OlmInboundGroupSession` to encrypted Base64.
+    QByteArray pickle(const PicklingMode &mode) const;
+    //! Deserialises from encrypted Base64 that was previously obtained by pickling
+    //! an `OlmInboundGroupSession`.
+    static std::variant<std::unique_ptr<QOlmInboundGroupSession>, OlmError> unpickle(QByteArray &picked, const PicklingMode &mode);
+    //! Decrypts ciphertext received for this group session.
+    std::variant<std::pair<QString, uint32_t>, OlmError> decrypt(const QByteArray &message);
+    //! Export the base64-encoded ratchet key for this session, at the given index,
+    //! in a format which can be used by import.
+    std::variant<QByteArray, OlmError> exportSession(uint32_t messageIndex);
+    //! Get the first message index we know how to decrypt.
+    uint32_t firstKnownIndex() const;
+    //! Get a base64-encoded identifier for this session.
+    QByteArray sessionId() const;
+    bool isVerified() const;
+    QOlmInboundGroupSession(OlmInboundGroupSession *session);
+private:
+    OlmInboundGroupSession *m_groupSession;
+};
+
+using QOlmInboundGroupSessionPtr = std::unique_ptr<QOlmInboundGroupSession>;
+using OlmInboundGroupSessionPtr = std::unique_ptr<OlmInboundGroupSession>;
+} // namespace Quotient
+#endif