diff --git a/src/client_server.rs b/src/client_server.rs
index b66993a9..8627dcb8 100644
--- a/src/client_server.rs
+++ b/src/client_server.rs
@@ -4,7 +4,7 @@ use std::{
     time::{Duration, SystemTime},
 };
 
-use log::debug;
+use log::{debug, warn};
 use rocket::{get, options, post, put, State};
 use ruma_client_api::{
     error::{Error, ErrorKind},
@@ -15,7 +15,7 @@ use ruma_client_api::{
         config::{get_global_account_data, set_global_account_data},
         directory::{self, get_public_rooms_filtered},
         filter::{self, create_filter, get_filter},
-        keys::{get_keys, upload_keys},
+        keys::{claim_keys, get_keys, upload_keys},
         media::get_media_config,
         membership::{
             forget_room, get_member_events, invite_user, join_room_by_id, join_room_by_id_or_alias,
@@ -33,7 +33,7 @@ use ruma_client_api::{
         state::{create_state_event_for_empty_key, create_state_event_for_key},
         sync::sync_events,
         thirdparty::get_protocols,
-        to_device::send_event_to_device,
+        to_device::{self, send_event_to_device},
         typing::create_typing_event,
         uiaa::{AuthFlow, UiaaInfo, UiaaResponse},
         user_directory::search_users,
@@ -176,7 +176,8 @@ pub fn register_route(
         .update(
             None,
             &user_id,
-            EduEvent::PushRules(ruma_events::push_rules::PushRulesEvent {
+            &EventType::PushRules,
+            serde_json::to_value(ruma_events::push_rules::PushRulesEvent {
                 content: ruma_events::push_rules::PushRulesEventContent {
                     global: ruma_events::push_rules::Ruleset {
                         content: vec![],
@@ -202,7 +203,8 @@ pub fn register_route(
                         }],
                     },
                 },
-            }),
+            })
+            .unwrap(),
             &db.globals,
         )
         .unwrap();
@@ -353,7 +355,8 @@ pub fn set_pushrule_route(
         .update(
             None,
             &user_id,
-            EduEvent::PushRules(ruma_events::push_rules::PushRulesEvent {
+            &EventType::PushRules,
+            serde_json::to_value(ruma_events::push_rules::PushRulesEvent {
                 content: ruma_events::push_rules::PushRulesEventContent {
                     global: ruma_events::push_rules::Ruleset {
                         content: vec![],
@@ -379,7 +382,8 @@ pub fn set_pushrule_route(
                         }],
                     },
                 },
-            }),
+            })
+            .unwrap(),
             &db.globals,
         )
         .unwrap();
@@ -422,25 +426,56 @@ pub fn create_filter_route(_user_id: String) -> MatrixResult<create_filter::Resp
     }))
 }
 
-#[put("/_matrix/client/r0/user/<_user_id>/account_data/<_type>")]
+#[put(
+    "/_matrix/client/r0/user/<_user_id>/account_data/<_type>",
+    data = "<body>"
+)]
 pub fn set_global_account_data_route(
+    db: State<'_, Database>,
+    body: Ruma<set_global_account_data::Request>,
     _user_id: String,
     _type: String,
 ) -> MatrixResult<set_global_account_data::Response> {
+    let user_id = body.user_id.as_ref().expect("user is authenticated");
+
+    db.account_data
+        .update(
+            None,
+            user_id,
+            &EventType::try_from(&body.event_type).unwrap(),
+            serde_json::from_str(body.data.get()).unwrap(),
+            &db.globals,
+        )
+        .unwrap();
+
     MatrixResult(Ok(set_global_account_data::Response))
 }
 
-#[get("/_matrix/client/r0/user/<_user_id>/account_data/<_type>")]
+#[get(
+    "/_matrix/client/r0/user/<_user_id>/account_data/<_type>",
+    data = "<body>"
+)]
 pub fn get_global_account_data_route(
+    db: State<'_, Database>,
+    body: Ruma<get_global_account_data::Request>,
     _user_id: String,
     _type: String,
 ) -> MatrixResult<get_global_account_data::Response> {
-    // TODO
-    MatrixResult(Err(Error {
-        kind: ErrorKind::NotFound,
-        message: "Data not found.".to_owned(),
-        status_code: http::StatusCode::NOT_FOUND,
-    }))
+    let user_id = body.user_id.as_ref().expect("user is authenticated");
+
+    if let Some(data) = db
+        .account_data
+        .get(None, user_id, &EventType::try_from(&body.event_type).unwrap())
+        .unwrap()
+    {
+        MatrixResult(Ok(get_global_account_data::Response { account_data: data }))
+    } else {
+        MatrixResult(Err(Error {
+            kind: ErrorKind::NotFound,
+            message: "Data not found.".to_owned(),
+            status_code: http::StatusCode::NOT_FOUND,
+        }))
+    }
 }
 
 #[put("/_matrix/client/r0/profile/<_user_id>/displayname", data = "<body>")]
@@ -648,20 +683,93 @@ pub fn set_presence_route(
     MatrixResult(Ok(set_presence::Response))
 }
 
-#[post("/_matrix/client/r0/keys/query")]
-pub fn get_keys_route() -> MatrixResult<get_keys::Response> {
-    // TODO
-    MatrixResult(Ok(get_keys::Response {
-        failures: BTreeMap::new(),
-        device_keys: BTreeMap::new(),
+#[post("/_matrix/client/r0/keys/upload", data = "<body>")]
+pub fn upload_keys_route(
+    db: State<'_, Database>,
+    body: Ruma<upload_keys::Request>,
+) -> MatrixResult<upload_keys::Response> {
+    let user_id = body.user_id.as_ref().expect("user is authenticated");
+    let device_id = body.device_id.as_ref().expect("user is authenticated");
+
+    if let Some(one_time_keys) = &body.one_time_keys {
+        for (key_key, key_value) in one_time_keys {
+            db.users
+                .add_one_time_key(user_id, device_id, key_key, key_value)
+                .unwrap();
+        }
+    }
+
+    if let Some(device_keys) = &body.device_keys {
+        db.users
+            .add_device_keys(user_id, device_id, device_keys)
+            .unwrap();
+    }
+
+    MatrixResult(Ok(upload_keys::Response {
+        one_time_key_counts: db.users.count_one_time_keys(user_id, device_id).unwrap(),
     }))
 }
 
-#[post("/_matrix/client/r0/keys/upload")]
-pub fn upload_keys_route() -> MatrixResult<upload_keys::Response> {
-    // TODO
-    MatrixResult(Ok(upload_keys::Response {
-        one_time_key_counts: BTreeMap::new(),
+#[post("/_matrix/client/r0/keys/query", data = "<body>")]
+pub fn get_keys_route(
+    db: State<'_, Database>,
+    body: Ruma<get_keys::Request>,
+) -> MatrixResult<get_keys::Response> {
+    let mut device_keys = BTreeMap::new();
+
+    for (user_id, device_ids) in &body.device_keys {
+        if device_ids.is_empty() {
+            let mut container = BTreeMap::new();
+            for (device_id, keys) in db
+                .users
+                .all_device_keys(&user_id.clone())
+                .map(|r| r.unwrap())
+            {
+                container.insert(device_id, keys);
+            }
+            device_keys.insert(user_id.clone(), container);
+        } else {
+            for device_id in device_ids {
+                let mut container = BTreeMap::new();
+                for keys in db.users.get_device_keys(&user_id.clone(), &device_id) {
+                    container.insert(device_id.clone(), keys.unwrap());
+                }
+                device_keys.insert(user_id.clone(), container);
+            }
+        }
+    }
+
+    MatrixResult(Ok(get_keys::Response {
+        failures: BTreeMap::new(),
+        device_keys,
+    }))
+}
+
+#[post("/_matrix/client/r0/keys/claim", data = "<body>")]
+pub fn claim_keys_route(
+    db: State<'_, Database>,
+    body: Ruma<claim_keys::Request>,
+) -> MatrixResult<claim_keys::Response> {
+    let mut one_time_keys = BTreeMap::new();
+    for (user_id, map) in &body.one_time_keys {
+        let mut container = BTreeMap::new();
+        for (device_id, key_algorithm) in map {
+            if let Some(one_time_keys) = db
+                .users
+                .take_one_time_key(user_id, device_id, key_algorithm)
+                .unwrap()
+            {
+                let mut c = BTreeMap::new();
+                c.insert(one_time_keys.0, one_time_keys.1);
+                container.insert(device_id.clone(), c);
+            }
+        }
+        one_time_keys.insert(user_id.clone(), container);
+    }
+
+    MatrixResult(Ok(claim_keys::Response {
+        failures: BTreeMap::new(),
+        one_time_keys,
     }))
 }
 
@@ -672,16 +780,19 @@ pub fn set_read_marker_route(
     _room_id: String,
 ) -> MatrixResult<set_read_marker::Response> {
     let user_id = body.user_id.as_ref().expect("user is authenticated");
+
     db.account_data
         .update(
             Some(&body.room_id),
             &user_id,
-            EduEvent::FullyRead(ruma_events::fully_read::FullyReadEvent {
+            &EventType::FullyRead,
+            serde_json::to_value(ruma_events::fully_read::FullyReadEvent {
                 content: ruma_events::fully_read::FullyReadEventContent {
                     event_id: body.fully_read.clone(),
                 },
                 room_id: Some(body.room_id.clone()),
-            }),
+            })
+            .unwrap(),
             &db.globals,
         )
         .unwrap();
@@ -745,7 +856,7 @@ pub fn create_typing_event_route(
         content: ruma_events::typing::TypingEventContent {
             user_ids: vec![user_id.clone()],
         },
-        room_id: None, // None because it can be inferred
+        room_id: Some(body.room_id.clone()), // TODO: Can be None because it can be inferred
     });
 
     if body.typing {
@@ -860,7 +971,7 @@ pub fn get_alias_route(
     body: Ruma<get_alias::Request>,
     _room_alias: String,
 ) -> MatrixResult<get_alias::Response> {
-    // TODO
+    warn!("TODO: get_alias_route");
     let room_id = if body.room_alias.server_name() == db.globals.server_name() {
         match body.room_alias.alias() {
             "conduit" => "!lgOCCXQKtXOAPlAlG5:conduit.rs",
@@ -1092,13 +1203,13 @@ pub fn search_users_route(
 
 #[get("/_matrix/client/r0/rooms/<_room_id>/members")]
 pub fn get_member_events_route(_room_id: String) -> MatrixResult<get_member_events::Response> {
-    // TODO
+    warn!("TODO: get_member_events_route");
     MatrixResult(Ok(get_member_events::Response { chunk: Vec::new() }))
 }
 
 #[get("/_matrix/client/r0/thirdparty/protocols")]
 pub fn get_protocols_route() -> MatrixResult<get_protocols::Response> {
-    // TODO
+    warn!("TODO: get_protocols_route");
     MatrixResult(Ok(get_protocols::Response {
         protocols: BTreeMap::new(),
     }))
@@ -1208,6 +1319,8 @@ pub fn sync_route(
 ) -> MatrixResult<sync_events::Response> {
     std::thread::sleep(Duration::from_millis(1500));
     let user_id = body.user_id.as_ref().expect("user is authenticated");
+    let device_id = body.device_id.as_ref().expect("user is authenticated");
+
     let next_batch = db.globals.current_count().unwrap().to_string();
 
     let mut joined_rooms = BTreeMap::new();
@@ -1277,7 +1390,7 @@ pub fn sync_route(
                     content: ruma_events::typing::TypingEventContent {
                         user_ids: Vec::new(),
                     },
-                    room_id: None, // None because it can be inferred
+                    room_id: Some(room_id.clone()), // None because it can be inferred
                 })
                 .into(),
             );
@@ -1403,10 +1516,22 @@ pub fn sync_route(
                 .global_edus
                 .globallatests_since(since)
                 .unwrap()
-                .map(|edu| {
-                    EventJson::<ruma_events::presence::PresenceEvent>::from(
-                        edu.unwrap().json().to_owned(),
+                .filter_map(|edu| {
+                    // Only look for presence events
+                    if let Ok(mut edu) = EventJson::<ruma_events::presence::PresenceEvent>::from(
+                        edu.unwrap().into_json(),
                     )
+                    .deserialize()
+                    {
+                        let timestamp = edu.content.last_active_ago.unwrap();
+                        edu.content.last_active_ago = Some(
+                            js_int::UInt::try_from(utils::millis_since_unix_epoch()).unwrap()
+                                - timestamp
+                        );
+                        Some(edu.into())
+                    } else {
+                        None
+                    }
                 })
                 .collect(),
         },
@@ -1421,7 +1546,12 @@ pub fn sync_route(
         },
         device_lists: Default::default(),
         device_one_time_keys_count: Default::default(),
-        to_device: sync_events::ToDevice { events: Vec::new() },
+        to_device: sync_events::ToDevice {
+            events: db
+                .users
+                .take_to_device_events(user_id, device_id, 100)
+                .unwrap(),
+        },
     }))
 }
 
@@ -1468,7 +1598,7 @@ pub fn get_message_events_route(
 
 #[get("/_matrix/client/r0/voip/turnServer")]
 pub fn turn_server_route() -> MatrixResult<create_message_event::Response> {
-    // TODO
+    warn!("TODO: turn_server_route");
     MatrixResult(Err(Error {
         kind: ErrorKind::NotFound,
         message: "There is no turn server yet.".to_owned(),
@@ -1478,7 +1608,7 @@ pub fn turn_server_route() -> MatrixResult<create_message_event::Response> {
 
 #[post("/_matrix/client/r0/publicised_groups")]
 pub fn publicised_groups_route() -> MatrixResult<create_message_event::Response> {
-    // TODO
+    warn!("TODO: publicised_groups_route");
     MatrixResult(Err(Error {
         kind: ErrorKind::NotFound,
         message: "There are no publicised groups yet.".to_owned(),
@@ -1486,18 +1616,48 @@ pub fn publicised_groups_route() -> MatrixResult<create_message_event::Response>
     }))
 }
 
-#[put("/_matrix/client/r0/sendToDevice/<_event_type>/<_txn_id>")]
+#[put(
+    "/_matrix/client/r0/sendToDevice/<_event_type>/<_txn_id>",
+    data = "<body>"
+)]
 pub fn send_event_to_device_route(
+    db: State<'_, Database>,
+    body: Ruma<send_event_to_device::Request>,
     _event_type: String,
     _txn_id: String,
 ) -> MatrixResult<send_event_to_device::Response> {
-    // TODO
+    let user_id = body.user_id.as_ref().expect("user is authenticated");
+
+    for (target_user_id, map) in &body.messages {
+        for (target_device_id_maybe, event) in map {
+            match target_device_id_maybe {
+                to_device::DeviceIdOrAllDevices::DeviceId(target_device_id) => db
+                    .users
+                    .add_to_device_event(
+                        user_id,
+                        &target_user_id,
+                        &target_device_id,
+                        &body.event_type,
+                        serde_json::from_str(event.get()).unwrap(),
+                        &db.globals,
+                    )
+                    .unwrap(),
+
+                to_device::DeviceIdOrAllDevices::AllDevices => {
+                    for target_device_id in db.users.all_device_ids(&target_user_id) {
+                        target_device_id.unwrap();
+                    }
+                }
+            }
+        }
+    }
+
     MatrixResult(Ok(send_event_to_device::Response))
 }
 
 #[get("/_matrix/media/r0/config")]
 pub fn get_media_config_route() -> MatrixResult<get_media_config::Response> {
-    // TODO
+    warn!("TODO: get_media_config_route");
     MatrixResult(Ok(get_media_config::Response {
         upload_size: 0_u32.into(),
     }))
@@ -1509,7 +1669,7 @@ pub fn options_route(
 ) -> MatrixResult<create_message_event::Response> {
     MatrixResult(Err(Error {
         kind: ErrorKind::NotFound,
-        message: "This is the options route.".to_owned(),
+        message: "".to_owned(),
         status_code: http::StatusCode::OK,
     }))
 }
diff --git a/src/database.rs b/src/database.rs
index 0bd3aa02..4cdad872 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -59,6 +59,9 @@ impl Database {
                 userid_avatarurl: db.open_tree("userid_avatarurl").unwrap(),
                 userdeviceid_token: db.open_tree("userdeviceid_token").unwrap(),
                 token_userdeviceid: db.open_tree("token_userdeviceid").unwrap(),
+                onetimekeyid_onetimekeys: db.open_tree("onetimekeyid_onetimekeys").unwrap(),
+                userdeviceid_devicekeys: db.open_tree("userdeviceid_devicekeys").unwrap(),
+                todeviceid_events: db.open_tree("todeviceid_events").unwrap(),
             },
             rooms: rooms::Rooms {
                 edus: rooms::RoomEdus {
diff --git a/src/database/account_data.rs b/src/database/account_data.rs
index 7ade70ce..659d3e55 100644
--- a/src/database/account_data.rs
+++ b/src/database/account_data.rs
@@ -1,7 +1,7 @@
-use crate::Result;
-use ruma_events::{collections::only::Event as EduEvent, EventJson};
+use crate::{utils, Error, Result};
+use ruma_events::{collections::only::Event as EduEvent, EventJson, EventType};
 use ruma_identifiers::{RoomId, UserId};
-use std::collections::HashMap;
+use std::{collections::HashMap, convert::TryFrom};
 
 pub struct AccountData {
     pub(super) roomuserdataid_accountdata: sled::Tree, // RoomUserDataId = Room + User + Count + Type
@@ -13,7 +13,8 @@ impl AccountData {
         &self,
         room_id: Option<&RoomId>,
         user_id: &UserId,
-        event: EduEvent,
+        kind: &EventType,
+        data: serde_json::Value,
         globals: &super::globals::Globals,
     ) -> Result<()> {
         let mut prefix = room_id
@@ -48,11 +49,10 @@ impl AccountData {
         let mut key = prefix;
         key.extend_from_slice(&globals.next_count()?.to_be_bytes());
         key.push(0xff);
-        let json = serde_json::to_value(&event)?;
-        key.extend_from_slice(json["type"].as_str().unwrap().as_bytes());
+        key.extend_from_slice(kind.to_string().as_bytes());
 
         self.roomuserdataid_accountdata
-            .insert(key, &*json.to_string())
+            .insert(key, &*data.to_string())
             .unwrap();
 
         Ok(())
@@ -64,7 +64,7 @@ impl AccountData {
         &self,
         room_id: Option<&RoomId>,
         user_id: &UserId,
-        kind: &str,
+        kind: &EventType,
     ) -> Result<Option<EventJson<EduEvent>>> {
         Ok(self.all(room_id, user_id)?.remove(kind))
     }
@@ -75,7 +75,7 @@ impl AccountData {
         room_id: Option<&RoomId>,
         user_id: &UserId,
         since: u64,
-    ) -> Result<HashMap<String, EventJson<EduEvent>>> {
+    ) -> Result<HashMap<EventType, EventJson<EduEvent>>> {
         let mut userdata = HashMap::new();
 
         let mut prefix = room_id
@@ -91,17 +91,30 @@ impl AccountData {
         let mut first_possible = prefix.clone();
         first_possible.extend_from_slice(&(since + 1).to_be_bytes());
 
-        for json in self
+        for r in self
             .roomuserdataid_accountdata
             .range(&*first_possible..)
             .filter_map(|r| r.ok())
             .take_while(move |(k, _)| k.starts_with(&prefix))
-            .map(|(_, v)| serde_json::from_slice::<serde_json::Value>(&v).unwrap())
+            .map(|(k, v)| {
+                Ok::<_, Error>((
+                    EventType::try_from(utils::string_from_bytes(
+                        k.rsplit(|&b| b == 0xff)
+                            .next()
+                            .ok_or(Error::BadDatabase("roomuserdataid is invalid"))?,
+                    )?)
+                    .map_err(|_| Error::BadDatabase("roomuserdataid is invalid"))?,
+                    serde_json::from_slice::<serde_json::Value>(&v).unwrap(),
+                ))
+            })
         {
+            let (kind, content) = r.unwrap();
+            let mut json = serde_json::Map::new();
+            json.insert("content".to_owned(), content);
+            json.insert("type".to_owned(), kind.to_string().into());
             userdata.insert(
-                json["type"].as_str().unwrap().to_owned(),
-                serde_json::from_value::<EventJson<EduEvent>>(json)
-                    .expect("userdata in db is valid"),
+                kind,
+                serde_json::from_value::<EventJson<EduEvent>>(json.into())?,
             );
         }
 
@@ -113,7 +126,7 @@ impl AccountData {
         &self,
         room_id: Option<&RoomId>,
         user_id: &UserId,
-    ) -> Result<HashMap<String, EventJson<EduEvent>>> {
+    ) -> Result<HashMap<EventType, EventJson<EduEvent>>> {
         self.changes_since(room_id, user_id, 0)
     }
 }
diff --git a/src/database/global_edus.rs b/src/database/global_edus.rs
index db446749..f6652606 100644
--- a/src/database/global_edus.rs
+++ b/src/database/global_edus.rs
@@ -3,8 +3,8 @@ use ruma_events::{collections::only::Event as EduEvent, EventJson};
 use ruma_identifiers::UserId;
 
 pub struct GlobalEdus {
+    //pub globalallid_globalall: sled::Tree, // ToDevice, GlobalAllId = UserId + Count
     pub(super) globallatestid_globallatest: sled::Tree, // Presence, GlobalLatestId = Count + UserId
-                                                        //pub globalallid_globalall: sled::Tree, // ToDevice, GlobalAllId = UserId + Count
 }
 
 impl GlobalEdus {
diff --git a/src/database/users.rs b/src/database/users.rs
index 5a8b0aa6..ced5fe16 100644
--- a/src/database/users.rs
+++ b/src/database/users.rs
@@ -1,6 +1,9 @@
 use crate::{utils, Error, Result};
-use ruma_identifiers::UserId;
-use std::convert::TryFrom;
+use js_int::UInt;
+use ruma_client_api::r0::keys::{AlgorithmAndDeviceId, DeviceKeys, KeyAlgorithm, OneTimeKey};
+use ruma_events::{to_device::AnyToDeviceEvent, EventJson, EventType};
+use ruma_identifiers::{DeviceId, UserId};
+use std::{collections::BTreeMap, convert::TryFrom};
 
 pub struct Users {
     pub(super) userid_password: sled::Tree,
@@ -9,6 +12,11 @@ pub struct Users {
     pub(super) userdeviceids: sled::Tree,
     pub(super) userdeviceid_token: sled::Tree,
     pub(super) token_userdeviceid: sled::Tree,
+
+    pub(super) onetimekeyid_onetimekeys: sled::Tree, // OneTimeKeyId = UserId + AlgorithmAndDeviceId
+    pub(super) userdeviceid_devicekeys: sled::Tree,
+
+    pub(super) todeviceid_events: sled::Tree, // ToDeviceId = UserId + DeviceId + Count
 }
 
 impl Users {
@@ -96,7 +104,7 @@ impl Users {
     }
 
     /// Adds a new device to a user.
-    pub fn create_device(&self, user_id: &UserId, device_id: &str, token: &str) -> Result<()> {
+    pub fn create_device(&self, user_id: &UserId, device_id: &DeviceId, token: &str) -> Result<()> {
         if !self.exists(user_id)? {
             return Err(Error::BadRequest(
                 "tried to create device for nonexistent user",
@@ -114,8 +122,22 @@ impl Users {
         Ok(())
     }
 
+    /// Returns an iterator over all device ids of this user.
+    pub fn all_device_ids(&self, user_id: &UserId) -> impl Iterator<Item = Result<DeviceId>> {
+        let mut prefix = user_id.to_string().as_bytes().to_vec();
+        prefix.push(0xff);
+        self.userdeviceids.scan_prefix(prefix).keys().map(|bytes| {
+            Ok(utils::string_from_bytes(
+                &*bytes?
+                    .rsplit(|&b| b == 0xff)
+                    .next()
+                    .ok_or(Error::BadDatabase("userdeviceid is invalid"))?,
+            )?)
+        })
+    }
+
     /// Replaces the access token of one device.
-    pub fn set_token(&self, user_id: &UserId, device_id: &str, token: &str) -> Result<()> {
+    pub fn set_token(&self, user_id: &UserId, device_id: &DeviceId, token: &str) -> Result<()> {
         let mut userdeviceid = user_id.to_string().as_bytes().to_vec();
         userdeviceid.push(0xff);
         userdeviceid.extend_from_slice(device_id.as_bytes());
@@ -138,4 +160,196 @@ impl Users {
 
         Ok(())
     }
+
+    pub fn add_one_time_key(
+        &self,
+        user_id: &UserId,
+        device_id: &DeviceId,
+        one_time_key_key: &AlgorithmAndDeviceId,
+        one_time_key_value: &OneTimeKey,
+    ) -> Result<()> {
+        let mut key = user_id.to_string().as_bytes().to_vec();
+        key.push(0xff);
+        key.extend_from_slice(device_id.as_bytes());
+
+        if self.userdeviceids.get(&key)?.is_none() {
+            return Err(Error::BadRequest(
+                "Tried to set token for nonexistent device",
+            ));
+        }
+
+        key.push(0xff);
+        // TODO: Use AlgorithmAndDeviceId::to_string when it's available (and update everything,
+        // because there are no wrapping quotation marks anymore)
+        key.extend_from_slice(&serde_json::to_string(one_time_key_key)?.as_bytes());
+
+        self.onetimekeyid_onetimekeys
+            .insert(&key, &*serde_json::to_string(&one_time_key_value)?)?;
+
+        Ok(())
+    }
+
+    pub fn take_one_time_key(
+        &self,
+        user_id: &UserId,
+        device_id: &DeviceId,
+        key_algorithm: &KeyAlgorithm,
+    ) -> Result<Option<(AlgorithmAndDeviceId, OneTimeKey)>> {
+        let mut prefix = user_id.to_string().as_bytes().to_vec();
+        prefix.push(0xff);
+        prefix.extend_from_slice(device_id.as_bytes());
+        prefix.push(0xff);
+        prefix.push(b'"'); // Annoying quotation mark
+        prefix.extend_from_slice(key_algorithm.to_string().as_bytes());
+        prefix.push(b':');
+
+        self.onetimekeyid_onetimekeys
+            .scan_prefix(&prefix)
+            .next()
+            .map(|r| {
+                let (key, value) = r?;
+                Ok((
+                    serde_json::from_slice(
+                        &*key
+                            .rsplit(|&b| b == 0xff)
+                            .next()
+                            .ok_or(Error::BadDatabase("onetimekeyid is invalid"))?,
+                    )?,
+                    serde_json::from_slice(&*value)?,
+                ))
+            })
+            .transpose()
+    }
+
+    pub fn count_one_time_keys(
+        &self,
+        user_id: &UserId,
+        device_id: &DeviceId,
+    ) -> Result<BTreeMap<KeyAlgorithm, UInt>> {
+        let mut userdeviceid = user_id.to_string().as_bytes().to_vec();
+        userdeviceid.push(0xff);
+        userdeviceid.extend_from_slice(device_id.as_bytes());
+
+        let mut counts = BTreeMap::new();
+
+        for algorithm in self
+            .onetimekeyid_onetimekeys
+            .scan_prefix(&userdeviceid)
+            .keys()
+            .map(|bytes| {
+                Ok::<_, Error>(
+                    serde_json::from_slice::<AlgorithmAndDeviceId>(
+                        &*bytes?
+                            .rsplit(|&b| b == 0xff)
+                            .next()
+                            .ok_or(Error::BadDatabase("onetimekeyid is invalid"))?,
+                    )?
+                    .0,
+                )
+            })
+        {
+            *counts.entry(algorithm?).or_default() += UInt::from(1_u32);
+        }
+
+        Ok(counts)
+    }
+
+    pub fn add_device_keys(
+        &self,
+        user_id: &UserId,
+        device_id: &DeviceId,
+        device_keys: &DeviceKeys,
+    ) -> Result<()> {
+        let mut userdeviceid = user_id.to_string().as_bytes().to_vec();
+        userdeviceid.push(0xff);
+        userdeviceid.extend_from_slice(device_id.as_bytes());
+
+        self.userdeviceid_devicekeys
+            .insert(&userdeviceid, &*serde_json::to_string(&device_keys)?)?;
+
+        Ok(())
+    }
+
+    pub fn get_device_keys(
+        &self,
+        user_id: &UserId,
+        device_id: &DeviceId,
+    ) -> impl Iterator<Item = Result<DeviceKeys>> {
+        let mut key = user_id.to_string().as_bytes().to_vec();
+        key.push(0xff);
+        key.extend_from_slice(device_id.as_bytes());
+
+        self.userdeviceid_devicekeys
+            .scan_prefix(key)
+            .values()
+            .map(|bytes| Ok(serde_json::from_slice(&bytes?)?))
+    }
+
+    pub fn all_device_keys(
+        &self,
+        user_id: &UserId,
+    ) -> impl Iterator<Item = Result<(String, DeviceKeys)>> {
+        let mut key = user_id.to_string().as_bytes().to_vec();
+        key.push(0xff);
+
+        self.userdeviceid_devicekeys.scan_prefix(key).map(|r| {
+            let (key, value) = r?;
+            Ok((
+                utils::string_from_bytes(
+                    key.rsplit(|&b| b == 0xff)
+                        .next()
+                        .ok_or(Error::BadDatabase("userdeviceid is invalid"))?,
+                )?,
+                serde_json::from_slice(&*value)?,
+            ))
+        })
+    }
+
+    pub fn add_to_device_event(
+        &self,
+        sender: &UserId,
+        target_user_id: &UserId,
+        target_device_id: &DeviceId,
+        event_type: &EventType,
+        content: serde_json::Value,
+        globals: &super::globals::Globals,
+    ) -> Result<()> {
+        let mut key = target_user_id.to_string().as_bytes().to_vec();
+        key.push(0xff);
+        key.extend_from_slice(target_device_id.as_bytes());
+        key.push(0xff);
+        key.extend_from_slice(&globals.next_count()?.to_be_bytes());
+
+        let mut json = serde_json::Map::new();
+        json.insert("type".to_owned(), event_type.to_string().into());
+        json.insert("sender".to_owned(), sender.to_string().into());
+        json.insert("content".to_owned(), content);
+
+        self.todeviceid_events
+            .insert(&key, &*serde_json::to_string(&json)?)?;
+
+        Ok(())
+    }
+
+    pub fn take_to_device_events(
+        &self,
+        user_id: &UserId,
+        device_id: &DeviceId,
+        max: usize,
+    ) -> Result<Vec<EventJson<AnyToDeviceEvent>>> {
+        let mut events = Vec::new();
+
+        let mut prefix = user_id.to_string().as_bytes().to_vec();
+        prefix.push(0xff);
+        prefix.extend_from_slice(device_id.as_bytes());
+        prefix.push(0xff);
+
+        for result in self.todeviceid_events.scan_prefix(&prefix).take(max) {
+            let (key, value) = result?;
+            events.push(serde_json::from_slice(&*value)?);
+            self.todeviceid_events.remove(key)?;
+        }
+
+        Ok(events)
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index 514a8ddd..717ef96e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -43,8 +43,9 @@ fn setup_rocket() -> rocket::Rocket {
                 client_server::get_avatar_url_route,
                 client_server::get_profile_route,
                 client_server::set_presence_route,
-                client_server::get_keys_route,
                 client_server::upload_keys_route,
+                client_server::get_keys_route,
+                client_server::claim_keys_route,
                 client_server::set_read_marker_route,
                 client_server::create_typing_event_route,
                 client_server::create_room_route,
diff --git a/src/server_server.rs b/src/server_server.rs
index 2fcbe986..84ca5cc3 100644
--- a/src/server_server.rs
+++ b/src/server_server.rs
@@ -166,7 +166,12 @@ pub fn get_server_keys(db: State<'_, Database>) -> Json<String> {
         .body(),
     )
     .unwrap();
-    ruma_signatures::sign_json(db.globals.server_name(), db.globals.keypair(), &mut response).unwrap();
+    ruma_signatures::sign_json(
+        db.globals.server_name(),
+        db.globals.keypair(),
+        &mut response,
+    )
+    .unwrap();
     Json(response.to_string())
 }