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diff --git a/src/service/messenger/messenger_api_util.h b/src/service/messenger/messenger_api_util.h
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+++ b/src/service/messenger/messenger_api_util.h
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+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020--2023 GNUnet e.V.
+
+   GNUnet is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   GNUnet is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/messenger_api_util.h
+ * @brief messenger api: client implementation of GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_UTIL_H
+#define GNUNET_SERVICE_MESSENGER_UTIL_H
+
+#include "platform.h"
+#include "gnunet_cadet_service.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_identity_service.h"
+#include "gnunet_messenger_service.h"
+
+/**
+ * Starts an urgent task to close a CADET channel asynchronously.
+ *
+ * @param[in,out] channel Channel
+ */
+void
+delayed_disconnect_channel (struct GNUNET_CADET_Channel *channel);
+
+/**
+ * Tries to generate an unused member id and store it into the <i>id</i> parameter.
+ * A map containing all currently used member ids is used to check against.
+ *
+ * @param[out] id New member id
+ * @param[in] members Map of member ids
+ * @return #GNUNET_YES on success, #GNUNET_NO on failure
+ */
+int
+generate_free_member_id (struct GNUNET_ShortHashCode *id,
+                         const struct GNUNET_CONTAINER_MultiShortmap *members);
+
+/**
+ * Returns the private identity key of #GNUNET_IDENTITY_ego_get_anonymous() without
+ * recalculating it every time.
+ *
+ * @return anonymous private key
+ */
+const struct GNUNET_CRYPTO_PrivateKey*
+get_anonymous_private_key ();
+
+/**
+ * Returns the public identity key of #GNUNET_IDENTITY_ego_get_anonymous() without
+ * recalculating it every time.
+ *
+ * @return anonymous public key
+ */
+const struct GNUNET_CRYPTO_PublicKey*
+get_anonymous_public_key ();
+
+/**
+ * Converts a Messenger service key of a room to the specific port which
+ * gets used for the CADET channels.
+ *
+ * The port includes upper bits of the #GNUNET_MESSENGER_VERSION to
+ * reduce the chance of incompatible connections.
+ *
+ * @param[in] key Messenger service room key
+ * @param[out] port CADET service port
+ */
+void
+convert_messenger_key_to_port (const struct GNUNET_HashCode *key,
+                               struct GNUNET_HashCode *port);
+
+/**
+ * Converts a peers identity to a short hash code which can be used
+ * as id to refer to a peer via sender id as attached in messages.
+ *
+ * @param[in] identity Peer identity
+ * @param[out] id Short peer id
+ */
+void
+convert_peer_identity_to_id (const struct GNUNET_PeerIdentity *identity,
+                             struct GNUNET_ShortHashCode *id);
+
+#endif //GNUNET_SERVICE_MESSENGER_UTIL_H