diff --git a/src/Olm.cpp b/src/Olm.cpp
new file mode 100644
index 00000000..814fce18
--- /dev/null
+++ b/src/Olm.cpp
@@ -0,0 +1,228 @@
+#include "Olm.hpp"
+
+#include "Cache.h"
+#include "Logging.hpp"
+
+using namespace mtx::crypto;
+
+namespace {
+auto client_ = std::make_unique<mtx::crypto::OlmClient>();
+}
+
+namespace olm {
+
+mtx::crypto::OlmClient *
+client()
+{
+ return client_.get();
+}
+
+void
+handle_to_device_messages(const std::vector<nlohmann::json> &msgs)
+{
+ if (msgs.empty())
+ return;
+
+ nhlog::crypto()->info("received {} to_device messages", msgs.size());
+
+ for (const auto &msg : msgs) {
+ try {
+ OlmMessage olm_msg = msg;
+ handle_olm_message(std::move(olm_msg));
+ } catch (const nlohmann::json::exception &e) {
+ nhlog::crypto()->warn(
+ "parsing error for olm message: {} {}", e.what(), msg.dump(2));
+ } catch (const std::invalid_argument &e) {
+ nhlog::crypto()->warn(
+ "validation error for olm message: {} {}", e.what(), msg.dump(2));
+ }
+ }
+}
+
+void
+handle_olm_message(const OlmMessage &msg)
+{
+ nhlog::crypto()->info("sender : {}", msg.sender);
+ nhlog::crypto()->info("sender_key: {}", msg.sender_key);
+
+ const auto my_key = olm::client()->identity_keys().curve25519;
+
+ for (const auto &cipher : msg.ciphertext) {
+ // We skip messages not meant for the current device.
+ if (cipher.first != my_key)
+ continue;
+
+ const auto type = cipher.second.type;
+ nhlog::crypto()->info("type: {}", type == 0 ? "OLM_PRE_KEY" : "OLM_MESSAGE");
+
+ auto payload = try_olm_decryption(msg.sender_key, cipher.second);
+
+ if (payload) {
+ nhlog::crypto()->info("decrypted olm payload: {}", payload.value().dump(2));
+ create_inbound_megolm_session(msg.sender, msg.sender_key, payload.value());
+ return;
+ }
+
+ // Not a PRE_KEY message
+ if (cipher.second.type != 0) {
+ // TODO: log that it should have matched something
+ return;
+ }
+
+ handle_pre_key_olm_message(msg.sender, msg.sender_key, cipher.second);
+ }
+}
+
+void
+handle_pre_key_olm_message(const std::string &sender,
+ const std::string &sender_key,
+ const OlmCipherContent &content)
+{
+ nhlog::crypto()->info("opening olm session with {}", sender);
+
+ OlmSessionPtr inbound_session = nullptr;
+ try {
+ inbound_session = olm::client()->create_inbound_session(content.body);
+
+ // We also remove the one time key used to establish that
+ // session so we'll have to update our copy of the account object.
+ cache::client()->saveOlmAccount(olm::client()->save("secret"));
+ } catch (const olm_exception &e) {
+ nhlog::crypto()->critical(
+ "failed to create inbound session with {}: {}", sender, e.what());
+ return;
+ }
+
+ if (!matches_inbound_session_from(inbound_session.get(), sender_key, content.body)) {
+ nhlog::crypto()->warn("inbound olm session doesn't match sender's key ({})",
+ sender);
+ return;
+ }
+
+ mtx::crypto::BinaryBuf output;
+ try {
+ output =
+ olm::client()->decrypt_message(inbound_session.get(), content.type, content.body);
+ } catch (const olm_exception &e) {
+ nhlog::crypto()->critical(
+ "failed to decrypt olm message {}: {}", content.body, e.what());
+ return;
+ }
+
+ auto plaintext = json::parse(std::string((char *)output.data(), output.size()));
+ nhlog::crypto()->info("decrypted message: \n {}", plaintext.dump(2));
+
+ try {
+ cache::client()->saveOlmSession(sender_key, std::move(inbound_session));
+ } catch (const lmdb::error &e) {
+ nhlog::db()->warn(
+ "failed to save inbound olm session from {}: {}", sender, e.what());
+ }
+
+ create_inbound_megolm_session(sender, sender_key, plaintext);
+}
+
+mtx::events::msg::Encrypted
+encrypt_group_message(const std::string &room_id,
+ const std::string &device_id,
+ const std::string &body)
+{
+ using namespace mtx::events;
+
+ // Always chech before for existence.
+ auto res = cache::client()->getOutboundMegolmSession(room_id);
+ auto payload = olm::client()->encrypt_group_message(res.session, body);
+
+ // Prepare the m.room.encrypted event.
+ msg::Encrypted data;
+ data.ciphertext = std::string((char *)payload.data(), payload.size());
+ data.sender_key = olm::client()->identity_keys().curve25519;
+ data.session_id = res.data.session_id;
+ data.device_id = device_id;
+
+ auto message_index = olm_outbound_group_session_message_index(res.session);
+ nhlog::crypto()->info("next message_index {}", message_index);
+
+ // We need to re-pickle the session after we send a message to save the new message_index.
+ cache::client()->updateOutboundMegolmSession(room_id, message_index);
+
+ return data;
+}
+
+boost::optional<json>
+try_olm_decryption(const std::string &sender_key, const OlmCipherContent &msg)
+{
+ auto session_ids = cache::client()->getOlmSessions(sender_key);
+
+ for (const auto &id : session_ids) {
+ auto session = cache::client()->getOlmSession(sender_key, id);
+
+ if (!session)
+ continue;
+
+ mtx::crypto::BinaryBuf text;
+
+ try {
+ text = olm::client()->decrypt_message(session->get(), msg.type, msg.body);
+ cache::client()->saveOlmSession(id, std::move(session.value()));
+
+ } catch (const olm_exception &e) {
+ nhlog::crypto()->info("failed to decrypt olm message ({}, {}) with {}: {}",
+ msg.type,
+ sender_key,
+ id,
+ e.what());
+ continue;
+ } catch (const lmdb::error &e) {
+ nhlog::crypto()->critical("failed to save session: {}", e.what());
+ return {};
+ }
+
+ try {
+ return json::parse(std::string((char *)text.data(), text.size()));
+ } catch (const json::exception &e) {
+ nhlog::crypto()->critical("failed to parse the decrypted session msg: {}",
+ e.what());
+ }
+ }
+
+ return {};
+}
+
+void
+create_inbound_megolm_session(const std::string &sender,
+ const std::string &sender_key,
+ const nlohmann::json &payload)
+{
+ std::string room_id, session_id, session_key;
+
+ try {
+ room_id = payload.at("content").at("room_id");
+ session_id = payload.at("content").at("session_id");
+ session_key = payload.at("content").at("session_key");
+ } catch (const nlohmann::json::exception &e) {
+ nhlog::crypto()->critical(
+ "failed to parse plaintext olm message: {} {}", e.what(), payload.dump(2));
+ return;
+ }
+
+ MegolmSessionIndex index;
+ index.room_id = room_id;
+ index.session_id = session_id;
+ index.sender_key = sender_key;
+
+ try {
+ auto megolm_session = olm::client()->init_inbound_group_session(session_key);
+ cache::client()->saveInboundMegolmSession(index, std::move(megolm_session));
+ } catch (const lmdb::error &e) {
+ nhlog::crypto()->critical("failed to save inbound megolm session: {}", e.what());
+ return;
+ } catch (const olm_exception &e) {
+ nhlog::crypto()->critical("failed to create inbound megolm session: {}", e.what());
+ return;
+ }
+
+ nhlog::crypto()->info("established inbound megolm session ({}, {})", room_id, sender);
+}
+
+} // namespace olm
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