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	diff --git a/src/crypto/crypto.cpp b/src/crypto/crypto.cpp
	index 2559097..efa3665 100644
	--- a/src/crypto/crypto.cpp
	+++ b/src/crypto/crypto.cpp
	@@ -1,674 +1,678 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>

	#include <vector>

	#include <zug/transducer/filter.hpp>

	#include <vodozemac.h>

	#include <nlohmann/json.hpp>

	#include <debug.hpp>
	#include <event.hpp>
	#include <cursorutil.hpp>
	#include <types.hpp>
	#include <validator.hpp>
	#include "crypto-p.hpp"
	#include "session-p.hpp"
	#include "crypto-util-p.hpp"
	#include "crypto-util.hpp"
	#include "time-util.hpp"

	namespace Kazv
	{
	using namespace CryptoConstants;

	CryptoPrivate::CryptoPrivate()
	: account(std::nullopt)
	, valid(false)
	{
	}

	CryptoPrivate::CryptoPrivate(RandomTag, [[maybe_unused]] RandomData data)
	: account(std::nullopt)
	, valid(true)
	{
	account = vodozemac::olm::new_account();
	}


	CryptoPrivate::~CryptoPrivate()
	{
	}

	CryptoPrivate::CryptoPrivate(const CryptoPrivate &that)
	: account(std::nullopt)
	, uploadedOneTimeKeysCount(that.uploadedOneTimeKeysCount)
	, numUnpublishedKeys(that.numUnpublishedKeys)
	, knownSessions(that.knownSessions)
	, inboundGroupSessions(that.inboundGroupSessions)
	, outboundGroupSessions(that.outboundGroupSessions)
	{
	if (that.valid) {
	valid = unpickle(that.pickle());
	}
	}

	std::string CryptoPrivate::pickle() const
	{
	auto pickleData = account.value()->pickle(VODOZEMAC_PICKLE_KEY);
	return static_cast<std::string>(pickleData);
	}

	bool CryptoPrivate::unpickle(std::string pickleData)
	{
	account = checkVodozemacError([&]() {
	return vodozemac::olm::account_from_pickle(
	rust::Str(pickleData),
	VODOZEMAC_PICKLE_KEY
	);
	});
	return account.has_value();
	}

	bool CryptoPrivate::unpickleFromLibolm(std::string pickleData)
	{
	account = checkVodozemacError([&]() {
	return vodozemac::olm::account_from_libolm_pickle(
	rust::Str(pickleData),
	rust::Slice<const unsigned char>(OLM_PICKLE_KEY.data(), OLM_PICKLE_KEY.size())
	);
	});
	return account.has_value();
	}

	MaybeString CryptoPrivate::decryptOlm(nlohmann::json content)
	{
	auto theirCurve25519IdentityKey = content.at("sender_key").get<std::string>();

	auto ourCurve25519IdentityKey = curve25519IdentityKey();

	if (! content.at("ciphertext").contains(ourCurve25519IdentityKey)) {
	return NotBut("Message not intended for us");
	}

	auto type = content.at("ciphertext").at(ourCurve25519IdentityKey).at("type").get<int>();
	auto body = content.at("ciphertext").at(ourCurve25519IdentityKey).at("body").get<std::string>();

	auto hasKnownSession = knownSessions.find(theirCurve25519IdentityKey) != knownSessions.end();

	if (type == 0) { // pre-key message
	bool shouldCreateNewSession =
	// there is no possible session
	(! hasKnownSession)
	// the possible session does not match this message
	\|\| (! knownSessions.at(theirCurve25519IdentityKey).matches(body));

	if (shouldCreateNewSession) {
	auto created = createInboundSession(theirCurve25519IdentityKey, body);

	if (! created) { // cannot create session, thus cannot decrypt
	return NotBut("Cannot create session");
	}

	auto &session = knownSessions.at(theirCurve25519IdentityKey);
	return session.m_d->takeFirstDecrypted();
	}

	auto &session = knownSessions.at(theirCurve25519IdentityKey);

	return session.decrypt(type, body);
	} else {
	if (! hasKnownSession) {
	return NotBut("No available session");
	}

	auto &session = knownSessions.at(theirCurve25519IdentityKey);
	return session.decrypt(type, body);
	}
	}

	MaybeString CryptoPrivate::decryptMegOlm(nlohmann::json eventJson)
	{
	auto content = eventJson.at("content");

	auto sessionId = content.at("session_id").get<std::string>();
	auto roomId = eventJson.at("room_id").get<std::string>();

	auto k = KeyOfGroupSession{roomId, sessionId};

	if (inboundGroupSessions.find(k) == inboundGroupSessions.end()) {
	return NotBut("We do not have the keys for this");
	} else {
	auto msg = content.at("ciphertext").get<std::string>();
	auto eventId = eventJson.at("event_id").get<std::string>();
	auto originServerTs = eventJson.at("origin_server_ts").get<Timestamp>();
	auto &session = inboundGroupSessions.at(k);

	return session.decrypt(msg, eventId, originServerTs);
	}
	}

	bool CryptoPrivate::createInboundSession(std::string theirCurve25519IdentityKey,
	std::string message)
	{
	auto s = Session(InboundSessionTag{}, *this,
	theirCurve25519IdentityKey, message);

	if (s.valid()) {
	knownSessions.insert_or_assign(theirCurve25519IdentityKey, std::move(s));
	return true;
	}

	return false;
	}

	bool CryptoPrivate::reuseOrCreateOutboundGroupSession(
	RandomData random, Timestamp timeMs,
	std::string roomId, std::optional<MegOlmSessionRotateDesc> desc)
	{
	bool valid = true;
	if (! desc.has_value()) { // force rotate
	valid = false;
	} else {
	auto it = outboundGroupSessions.find(roomId);
	if (it == outboundGroupSessions.end()) {
	valid = false;
	} else {
	auto &session = it->second;
	if (timeMs - session.creationTimeMs() >= desc.value().ms) {
	valid = false;
	} else if (session.messageIndex() >= desc.value().messages) {
	valid = false;
	}
	}
	}

	if (! valid) {
	outboundGroupSessions.insert_or_assign(roomId, OutboundGroupSession(RandomTag{}, random, timeMs));
	auto &session = outboundGroupSessions.at(roomId);
	auto sessionId = session.sessionId();
	auto sessionKey = session.sessionKey();

	auto k = KeyOfGroupSession{roomId, sessionId};

	if (! createInboundGroupSession(k, sessionKey, ed25519IdentityKey())) {
	kzo.client.warn() << "Create inbound group session from outbound group session failed. We may not be able to read our own messages." << std::endl;
	}
	}
	return valid;
	}


	std::size_t Crypto::constructRandomSize()
	{
	return 0;
	}

	Crypto::Crypto()
	: m_d(new CryptoPrivate{})
	{
	}

	Crypto::Crypto(RandomTag, RandomData data)
	: m_d(new CryptoPrivate(RandomTag{}, std::move(data)))
	{
	}

	Crypto::~Crypto() = default;

	Crypto::Crypto(const Crypto &that)
	: m_d(new CryptoPrivate(*that.m_d))
	{
	}

	Crypto::Crypto(Crypto &&that)
	: m_d(std::move(that.m_d))
	{
	}

	Crypto &Crypto::operator=(const Crypto &that)
	{
	m_d.reset(new CryptoPrivate(*that.m_d));
	return *this;
	}

	Crypto &Crypto::operator=(Crypto &&that)
	{
	m_d = std::move(that.m_d);
	return *this;
	}

	bool Crypto::operator==(const Crypto &that) const
	{
	return this->m_d == that.m_d;
	}

	bool Crypto::valid() const
	{
	return m_d->valid;
	}

	std::string CryptoPrivate::ed25519IdentityKey() const
	{
	auto key = account.value()->ed25519_key()->to_base64();
	return static_cast<std::string>(key);
	}

	std::string CryptoPrivate::curve25519IdentityKey() const
	{
	auto key = account.value()->curve25519_key()->to_base64();
	return static_cast<std::string>(key);
	}

	std::string Crypto::ed25519IdentityKey() const
	{
	return m_d->ed25519IdentityKey();
	}

	std::string Crypto::curve25519IdentityKey() const
	{
	return m_d->curve25519IdentityKey();
	}

	std::string Crypto::sign(nlohmann::json j)
	{
	j.erase("signatures");
	j.erase("unsigned");

	auto str = j.dump();

	auto signature = checkVodozemacError([&]() {
	return m_d->account.value()->sign(str);
	});

	if (!signature.has_value()) {
	return "";
	}

	return static_cast<std::string>(signature.value()->to_base64());
	}

	void Crypto::setUploadedOneTimeKeysCount(immer::map<std::string /* algorithm */, int> uploadedOneTimeKeysCount)
	{
	m_d->uploadedOneTimeKeysCount = uploadedOneTimeKeysCount;
	}

	std::size_t Crypto::maxNumberOfOneTimeKeys() const
	{
	return m_d->account.value()->max_number_of_one_time_keys();
	}

	std::size_t Crypto::genOneTimeKeysRandomSize([[maybe_unused]] int num)
	{
	return 0;
	}

	void Crypto::genOneTimeKeysWithRandom([[maybe_unused]] RandomData random, int num)
	{
	assert(random.size() >= genOneTimeKeysRandomSize(num));

	m_d->account.value()->generate_one_time_keys(num);
	m_d->numUnpublishedKeys += num;
	}


	nlohmann::json Crypto::unpublishedOneTimeKeys() const
	{
	auto keys = m_d->account.value()->one_time_keys();
	auto ret = nlohmann::json{
	{curve25519, nlohmann::json::object()},
	};

	for (const auto &k : keys) {
	auto keyId = static_cast<std::string>(k.key_id);
	auto key = static_cast<std::string>(k.key->to_base64());
	ret[curve25519][keyId] = key;
	}

	return ret;
	}

	void Crypto::markOneTimeKeysAsPublished()
	{
	m_d->account.value()->mark_keys_as_published();
	m_d->numUnpublishedKeys = 0;
	}

	int Crypto::numUnpublishedOneTimeKeys() const
	{
	return m_d->numUnpublishedKeys;
	}

	int Crypto::uploadedOneTimeKeysCount(std::string algorithm) const
	{
	return m_d->uploadedOneTimeKeysCount[algorithm];
	}

	MaybeString Crypto::decrypt(nlohmann::json eventJson)
	{
	- auto content = eventJson.at("content");
	- auto algo = content.contains("algorithm") ? content.at("algorithm").template get<std::string>() : std::string();
	- if (algo == olmAlgo) {
	- return m_d->decryptOlm(std::move(content));
	- } else if (algo == megOlmAlgo) {
	- return m_d->decryptMegOlm(eventJson);
	+ try {
	+ auto content = eventJson.at("content");
	+ auto algo = content.contains("algorithm") ? content.at("algorithm").template get<std::string>() : std::string();
	+ if (algo == olmAlgo) {
	+ return m_d->decryptOlm(std::move(content));
	+ } else if (algo == megOlmAlgo) {
	+ return m_d->decryptMegOlm(eventJson);
	+ }
	+ return NotBut("Algorithm " + algo + " not supported");
	+ } catch (const std::exception &e) {
	+ return NotBut("Malformed event");
	}
	- return NotBut("Algorithm " + algo + " not supported");
	}

	bool Crypto::createInboundGroupSession(KeyOfGroupSession k, std::string sessionKey, std::string ed25519Key)
	{
	return m_d->createInboundGroupSession(std::move(k), std::move(sessionKey), std::move(ed25519Key));
	}

	std::size_t Crypto::importInboundGroupSessions(const nlohmann::json &keys)
	{
	if (!keys.is_array()) {
	return 0;
	}
	auto validateStr = identValidate(&nlohmann::json::is_string);
	std::size_t count = 0;
	for (const auto &data : keys) {
	if (!data.is_object()) {
	continue;
	}

	auto key = nlohmann::json::object();
	if (!(cast(key, data, "algorithm", identValidate([](const auto &j) {
	return j == megOlmAlgo;
	})) && cast(key, data, "room_id", validateStr)
	&& cast(key, data, "session_key", validateStr)
	&& cast(key, data, "session_id", validateStr)
	&& cast(key, data, "/sender_claimed_keys/ed25519"_json_pointer, validateStr)
	)) {
	continue;
	}

	auto keyOfGroupSession = KeyOfGroupSession{
	key["room_id"].template get<std::string>(),
	key["session_id"].template get<std::string>(),
	};
	if (createInboundGroupSession(
	keyOfGroupSession,
	key["session_key"].template get<std::string>(),
	key["sender_claimed_keys"]["ed25519"].template get<std::string>()
	)) {
	++count;
	}
	}
	return count;
	}

	bool Crypto::hasInboundGroupSession(KeyOfGroupSession k) const
	{
	return m_d->inboundGroupSessions.find(k) != m_d->inboundGroupSessions.end();
	}

	bool CryptoPrivate::createInboundGroupSession(KeyOfGroupSession k, std::string sessionKey, std::string ed25519Key)
	{
	auto session = InboundGroupSession(sessionKey, ed25519Key);
	if (!session.valid()) {
	kzo.crypto.warn() << "Invalid session key for: " << k.roomId << ", " << k.sessionId << std::endl;
	return false;
	}

	auto currentSessionIt = inboundGroupSessions.find(k);
	if (currentSessionIt == inboundGroupSessions.end()) {
	// the session is new, insert it
	inboundGroupSessions.insert({k, std::move(session)});
	return true;
	}

	// the session already exists, do some check
	auto &currentSession = currentSessionIt->second;
	if (currentSession.ed25519Key() != ed25519Key) {
	return false;
	}

	return currentSession.merge(session);
	}

	bool Crypto::verify(nlohmann::json object, std::string userId, std::string deviceId, std::string ed25519Key)
	{
	if (! object.contains("signatures")) {
	return false;
	}
	std::string signature;
	try {
	signature = object.at("signatures").at(userId).at(ed25519 + ":" + deviceId);
	} catch(const std::exception &) {
	return false;
	}
	object.erase("signatures");
	object.erase("unsigned");

	auto message = object.dump();

	auto res = checkVodozemacError([&]() {
	auto key = vodozemac::types::ed25519_key_from_base64(ed25519Key);
	auto sig = vodozemac::types::ed25519_signature_from_base64(signature);
	key->verify(message, *sig);
	// It throws if the signature cannot be verified
	return true;
	});

	return res.has_value() && res.value();
	}

	MaybeString Crypto::getInboundGroupSessionEd25519KeyFromEvent(const nlohmann::json &eventJson) const
	{
	auto content = eventJson.at("content");

	auto sessionId = content.at("session_id").get<std::string>();
	auto roomId = eventJson.at("room_id").get<std::string>();

	auto k = KeyOfGroupSession{roomId, sessionId};

	if (m_d->inboundGroupSessions.find(k) == m_d->inboundGroupSessions.end()) {
	return NotBut("We do not have the keys for this");
	} else {
	auto &session = m_d->inboundGroupSessions.at(k);
	return session.ed25519Key();
	}
	}

	std::size_t Crypto::encryptOlmRandomSize(std::string /* theirCurve25519IdentityKey */) const
	{
	// HACK: To prevent a possible race condition where we call
	// encryptedOlmRandomSize() -> randomGenerator.generateRange() ~> [encryptOlm()]
	//
	// Here, encryptOlm() must be called in the reducer,
	// as it changes the status of
	// Crypto (so we should not risk any infomation lose in Crypto).
	// Also, for the reducer to be pure, we may not call generateRange() in the reducer,
	// as that is not a pure function. This means it can only be called in an effect,
	// or .then() continuation. This means, the sequence from encryptedOlmRandomSize()
	// to encryptOlm() can never be atomic. That is, there may be other encryptOlm()
	// calls within, and that may increase the random data needed, and as a result,
	// we will not have enough random data.
	//
	// According to the olm headers:
	// https://gitlab.matrix.org/matrix-org/olm/-/blob/master/include/olm/ratchet.hh
	// The maximum random size needed to encrypt is 32. We use this to ensure we
	// will always have enough random data fot the encryption.
	return encryptOlmMaxRandomSize();
	}

	std::size_t Crypto::encryptOlmMaxRandomSize()
	{
	return 0;
	}

	nlohmann::json Crypto::encryptOlmWithRandom(
	RandomData random, nlohmann::json eventJson, std::string theirCurve25519IdentityKey)
	{
	assert(random.size() >= encryptOlmRandomSize(theirCurve25519IdentityKey));
	try {
	auto &session = m_d->knownSessions.at(theirCurve25519IdentityKey);
	auto [type, body] = session.encryptWithRandom(random, eventJson.dump());
	return nlohmann::json{
	{
	theirCurve25519IdentityKey, {
	{"type", type},
	{"body", body}
	}
	}
	};
	} catch (const std::exception &) {
	return nlohmann::json::object();
	}
	}

	nlohmann::json Crypto::encryptMegOlm(nlohmann::json eventJson)
	{
	auto roomId = eventJson.at("room_id").get<std::string>();
	auto content = eventJson.at("content");
	auto type = eventJson.at("type").get<std::string>();

	auto jsonToEncrypt = nlohmann::json::object();
	jsonToEncrypt["room_id"] = roomId;
	jsonToEncrypt["content"] = std::move(content);
	jsonToEncrypt["type"] = type;

	auto textToEncrypt = std::move(jsonToEncrypt).dump();

	auto &session = m_d->outboundGroupSessions.at(roomId);

	auto ciphertext = session.encrypt(std::move(textToEncrypt));

	return
	json{
	{"algorithm", CryptoConstants::megOlmAlgo},
	// NOTE: we might stop sending sender_key in the future
	// as per the Matrix spec
	{"sender_key", curve25519IdentityKey()},
	{"ciphertext", ciphertext},
	{"session_id", session.sessionId()},
	};
	}

	std::size_t Crypto::rotateMegOlmSessionRandomSize()
	{
	return OutboundGroupSession::constructRandomSize();
	}

	std::string Crypto::rotateMegOlmSessionWithRandom(RandomData random, Timestamp timeMs, std::string roomId)
	{
	m_d->reuseOrCreateOutboundGroupSession(
	random, timeMs,
	roomId, std::nullopt);
	return outboundGroupSessionCurrentKey(roomId);
	}

	std::optional<std::string> Crypto::rotateMegOlmSessionWithRandomIfNeeded(
	RandomData random, Timestamp timeMs,
	std::string roomId, MegOlmSessionRotateDesc desc)
	{
	auto oldSessionValid = m_d->reuseOrCreateOutboundGroupSession(random, timeMs, roomId, std::move(desc));
	return oldSessionValid ? std::nullopt : std::optional(outboundGroupSessionCurrentKey(roomId));
	}

	std::string Crypto::outboundGroupSessionInitialKey(std::string roomId)
	{
	auto &session = m_d->outboundGroupSessions.at(roomId);
	return session.initialSessionKey();
	}

	std::string Crypto::outboundGroupSessionCurrentKey(std::string roomId)
	{
	auto &session = m_d->outboundGroupSessions.at(roomId);
	return session.sessionKey();
	}

	auto Crypto::devicesMissingOutboundSessionKey(
	immer::map<std::string, immer::map<std::string /* deviceId */,
	std::string /* curve25519IdentityKey */>> keyMap) const -> UserIdToDeviceIdMap
	{
	auto ret = UserIdToDeviceIdMap{};
	for (auto [userId, devices] : keyMap) {
	auto unknownDevices =
	intoImmer(immer::flex_vector<std::string>{},
	zug::filter([this](auto kv) {
	auto [deviceId, theirCurve25519IdentityKey] = kv;
	return m_d->knownSessions.find(theirCurve25519IdentityKey)
	== m_d->knownSessions.end();
	})
	\| zug::map([](auto kv) {
	auto [deviceId, key] = kv;
	return deviceId;
	}),
	devices);
	if (! unknownDevices.empty()) {
	ret = std::move(ret).set(userId, std::move(unknownDevices));
	}
	}
	return ret;
	}

	std::size_t Crypto::createOutboundSessionRandomSize()
	{
	return Session::constructOutboundRandomSize();
	}

	void Crypto::createOutboundSessionWithRandom(
	RandomData random,
	std::string theirIdentityKey,
	std::string theirOneTimeKey)
	{
	assert(random.size() >= createOutboundSessionRandomSize());
	auto session = Session(OutboundSessionTag{},
	RandomTag{},
	random,
	*m_d,
	theirIdentityKey,
	theirOneTimeKey);

	if (session.valid()) {
	m_d->knownSessions.insert_or_assign(theirIdentityKey,
	std::move(session));
	}
	}

	nlohmann::json Crypto::toJson() const
	{
	std::string pickledData = m_d->valid ? m_d->pickle() : std::string();
	auto j = nlohmann::json::object({
	{"valid", m_d->valid},
	{"version", 1},
	{"account", std::move(pickledData)},
	{"uploadedOneTimeKeysCount", m_d->uploadedOneTimeKeysCount},
	{"numUnpublishedKeys", m_d->numUnpublishedKeys},
	{"knownSessions", nlohmann::json(m_d->knownSessions)},
	{"inboundGroupSessions", nlohmann::json(m_d->inboundGroupSessions)},
	{"outboundGroupSessions", nlohmann::json(m_d->outboundGroupSessions)},
	});

	return j;
	}

	void Crypto::loadJson(const nlohmann::json &j)
	{
	m_d->valid = j.contains("valid") ? j["valid"].template get<bool>() : true;
	const auto &pickledData = j.at("account").template get<std::string>();
	if (m_d->valid) {
	if (j.contains("version") && j["version"] == 1) {
	m_d->valid = m_d->unpickle(pickledData);
	} else {
	m_d->valid = m_d->unpickleFromLibolm(pickledData);
	}
	}

	m_d->uploadedOneTimeKeysCount = j.at("uploadedOneTimeKeysCount");
	m_d->numUnpublishedKeys = j.at("numUnpublishedKeys");
	m_d->knownSessions = j.at("knownSessions").template get<decltype(m_d->knownSessions)>();
	m_d->inboundGroupSessions = j.at("inboundGroupSessions").template get<decltype(m_d->inboundGroupSessions)>();
	m_d->outboundGroupSessions = j.at("outboundGroupSessions").template get<decltype(m_d->outboundGroupSessions)>();
	}
	}
	diff --git a/src/tests/crypto-test.cpp b/src/tests/crypto-test.cpp
	index e58cc53..35d4092 100644
	--- a/src/tests/crypto-test.cpp
	+++ b/src/tests/crypto-test.cpp
	@@ -1,815 +1,845 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>


	#include <catch2/catch_all.hpp>

	#include <sstream>

	#include <boost/archive/text_iarchive.hpp>
	#include <boost/archive/text_oarchive.hpp>


	#include <crypto/crypto.hpp>
	#include <aes-256-ctr.hpp>
	#include <base64.hpp>
	#include <sha256.hpp>
	#include "crypto/crypto-test-resource.hpp"

	using namespace Kazv;
	using namespace Kazv::CryptoConstants;

	using IAr = boost::archive::text_iarchive;
	using OAr = boost::archive::text_oarchive;

	static const auto resource = cryptoDumpResource();

	json makeEncryptedJson(json ciphertext, std::string senderKey)
	{
	return json{{"content", {
	{"algorithm", olmAlgo},
	{"ciphertext", std::move(ciphertext)},
	{"sender_key", std::move(senderKey)},
	}}};
	}

	template<class T>
	static void serializeDup(const T &in, T &out)
	{
	std::stringstream stream;

	{
	auto ar = OAr(stream);
	ar << in;
	}

	{
	auto ar = IAr(stream);
	ar >> out;
	}
	}

	static bool doesDecryptTo(Crypto &crypto, const nlohmann::json &encryptedEvent, const nlohmann::json &plainText)
	{
	auto res = crypto.decrypt(encryptedEvent);
	if (!res) {
	return false;
	}
	auto decrypted = json::parse(res.value());
	return decrypted == plainText;
	}

	TEST_CASE("Crypto constructors", "[crypto]")
	{
	Crypto crypto;
	REQUIRE(!crypto.valid());

	Crypto crypto2(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	REQUIRE(crypto2.valid());
	}

	TEST_CASE("Crypto conversion from libolm to vodozemac", "[crypto]")
	{
	Crypto a;
	a.loadJson(resource["a"]);

	Crypto b;
	b.loadJson(resource["b"]);

	// encrypt with existing sessions
	auto aIdKey = a.curve25519IdentityKey();
	auto origJson = json{{"test", "mew"}};
	{
	auto encryptedMsg = b.encryptOlmWithRandom(genRandomData(Crypto::encryptOlmMaxRandomSize()), origJson, aIdKey);

	auto decryptedOpt = a.decrypt(makeEncryptedJson(encryptedMsg, b.curve25519IdentityKey()));

	REQUIRE(decryptedOpt);
	}

	// encrypt/decrypt with new sessions
	auto k = a.unpublishedOneTimeKeys();
	a.markOneTimeKeysAsPublished();

	auto oneTimeKey = std::string{};

	for (auto [id, key] : k[curve25519].items()) {
	oneTimeKey = key;
	}

	{
	Crypto c(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	c.createOutboundSessionWithRandom(genRandomData(Crypto::createOutboundSessionRandomSize()), aIdKey, oneTimeKey);
	auto encryptedMsg = c.encryptOlmWithRandom(genRandomData(Crypto::encryptOlmMaxRandomSize()), origJson, aIdKey);
	auto decryptedOpt = a.decrypt(makeEncryptedJson(encryptedMsg, c.curve25519IdentityKey()));
	REQUIRE(decryptedOpt.reason() == "");
	REQUIRE(decryptedOpt);
	REQUIRE(decryptedOpt.value() == origJson.dump());
	}
	}

	TEST_CASE("Crypto should be copyable", "[crypto]")
	{
	Crypto crypto(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	crypto.genOneTimeKeysWithRandom(genRandomData(Crypto::genOneTimeKeysRandomSize(1)), 1);
	auto oneTimeKeys = crypto.unpublishedOneTimeKeys();
	Crypto cryptoClone(crypto);

	REQUIRE(crypto.ed25519IdentityKey() == cryptoClone.ed25519IdentityKey());
	REQUIRE(crypto.curve25519IdentityKey() == cryptoClone.curve25519IdentityKey());

	auto oneTimeKeys2 = cryptoClone.unpublishedOneTimeKeys();

	REQUIRE(oneTimeKeys == oneTimeKeys2);
	REQUIRE(crypto.numUnpublishedOneTimeKeys() == cryptoClone.numUnpublishedOneTimeKeys());
	}

	TEST_CASE("Crypto should be serializable", "[crypto]")
	{
	Crypto crypto(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	crypto.genOneTimeKeysWithRandom(genRandomData(Crypto::genOneTimeKeysRandomSize(1)), 1);
	auto oneTimeKeys = crypto.unpublishedOneTimeKeys();

	Crypto cryptoClone;

	serializeDup(crypto, cryptoClone);

	REQUIRE(crypto.ed25519IdentityKey() == cryptoClone.ed25519IdentityKey());
	REQUIRE(crypto.curve25519IdentityKey() == cryptoClone.curve25519IdentityKey());

	auto oneTimeKeys2 = cryptoClone.unpublishedOneTimeKeys();

	REQUIRE(oneTimeKeys == oneTimeKeys2);
	REQUIRE(crypto.numUnpublishedOneTimeKeys() == cryptoClone.numUnpublishedOneTimeKeys());
	}

	TEST_CASE("Invalid Crypto should be serializable", "[crypto]")
	{
	Crypto crypto;
	Crypto cryptoClone;
	serializeDup(crypto, cryptoClone);
	REQUIRE(!cryptoClone.valid());
	}

	TEST_CASE("Serialize Crypto with an OutboundGroupSession", "[crypto]")
	{
	Crypto crypto(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	std::string roomId = "!example:example.org";
	auto desc = MegOlmSessionRotateDesc{500000 /* ms /, 100 / messages */};

	crypto.rotateMegOlmSessionWithRandom(genRandomData(Crypto::rotateMegOlmSessionRandomSize()), currentTimeMs(), roomId);

	Crypto cryptoClone;

	serializeDup(crypto, cryptoClone);

	REQUIRE(! cryptoClone.rotateMegOlmSessionWithRandomIfNeeded(
	genRandomData(Crypto::rotateMegOlmSessionRandomSize()), currentTimeMs(),
	roomId, desc).has_value());
	}

	TEST_CASE("Should handle unknown device sending Olm pre-key message", "[crypto][olm]")
	{
	// Bob: the current user, generates and publishes one-time keys
	Crypto bob(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	bob.genOneTimeKeysWithRandom(genRandomData(Crypto::genOneTimeKeysRandomSize(1)), 1);
	auto bobKeys = bob.unpublishedOneTimeKeys();
	bob.markOneTimeKeysAsPublished();

	auto bobIdentityKey = bob.curve25519IdentityKey();
	auto bobOneTimeKey = std::string{};
	for (auto [id, key] : bobKeys[curve25519].items()) {
	bobOneTimeKey = key;
	}

	// Alice: a device that Bob does not know about
	// (Bob has never queried her keys or sent her a message)
	Crypto alice(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	auto aliceIdentityKey = alice.curve25519IdentityKey();

	// Alice creates an outbound session to Bob and encrypts a message
	alice.createOutboundSessionWithRandom(
	genRandomData(Crypto::createOutboundSessionRandomSize()),
	bobIdentityKey, bobOneTimeKey);

	auto plainText = json{{"test", "mew"}};
	auto encryptedMsg = alice.encryptOlmWithRandom(
	genRandomData(Crypto::encryptOlmMaxRandomSize()),
	plainText, bobIdentityKey);

	// Bob receives the Olm message from Alice
	auto encJson = makeEncryptedJson(encryptedMsg, aliceIdentityKey);

	auto decryptedOpt = bob.decrypt(encJson);
	REQUIRE(decryptedOpt);

	auto decryptedJson = json::parse(decryptedOpt.value());
	REQUIRE(decryptedJson == plainText);
	}

	TEST_CASE("Should reuse existing inbound session to encrypt after receiving from unknown device", "[crypto][olm]")
	{
	Crypto a(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	Crypto b(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	a.genOneTimeKeysWithRandom(genRandomData(Crypto::genOneTimeKeysRandomSize(1)), 1);
	auto k = a.unpublishedOneTimeKeys();
	a.markOneTimeKeysAsPublished();

	auto oneTimeKey = std::string{};
	for (auto [id, key] : k[curve25519].items()) {
	oneTimeKey = key;
	}

	auto aIdKey = a.curve25519IdentityKey();

	// b (unknown to a) creates outbound session and sends a pre-key message
	b.createOutboundSessionWithRandom(
	genRandomData(Crypto::createOutboundSessionRandomSize()), aIdKey, oneTimeKey);

	auto origJson = json{{"hello", "world"}};
	auto encryptedMsg = b.encryptOlmWithRandom(
	genRandomData(Crypto::encryptOlmMaxRandomSize()), origJson, aIdKey);

	auto encJson = makeEncryptedJson(encryptedMsg, b.curve25519IdentityKey());

	// a decrypts - this creates an inbound session from the pre-key message
	auto decryptedOpt = a.decrypt(encJson);
	REQUIRE(decryptedOpt);
	REQUIRE(json::parse(decryptedOpt.value()) == origJson);

	// Now a can use the inbound session to encrypt back to b
	using StrMap = immer::map<std::string, std::string>;
	auto devMap = immer::map<std::string, StrMap>()
	.set("b", StrMap().set("dev", b.curve25519IdentityKey()));

	auto devices = a.devicesMissingOutboundSessionKey(devMap);
	// The inbound session should be usable as an outbound session as well,
	// so no device should be missing an olm session
	auto expected = immer::map<std::string, immer::flex_vector<std::string>>();
	REQUIRE(devices == expected);
	}

	TEST_CASE("Generating and publishing keys should work", "[crypto]")
	{
	Crypto crypto(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	crypto.genOneTimeKeysWithRandom(genRandomData(Crypto::genOneTimeKeysRandomSize(1)), 1);

	REQUIRE(crypto.numUnpublishedOneTimeKeys() == 1);

	crypto.genOneTimeKeysWithRandom(genRandomData(Crypto::genOneTimeKeysRandomSize(1)), 1);
	REQUIRE(crypto.numUnpublishedOneTimeKeys() == 2);

	crypto.markOneTimeKeysAsPublished();
	REQUIRE(crypto.numUnpublishedOneTimeKeys() == 0);
	}

	TEST_CASE("Should reuse existing inbound session to encrypt", "[crypto]")
	{
	Crypto a(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	Crypto b(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	a.genOneTimeKeysWithRandom(genRandomData(Crypto::genOneTimeKeysRandomSize(1)), 1);
	// Get A publish the key and send to B
	auto k = a.unpublishedOneTimeKeys();
	a.markOneTimeKeysAsPublished();

	auto oneTimeKey = std::string{};

	for (auto [id, key] : k[curve25519].items()) {
	oneTimeKey = key;
	}

	auto aIdKey = a.curve25519IdentityKey();
	b.createOutboundSessionWithRandom(genRandomData(Crypto::createOutboundSessionRandomSize()), aIdKey, oneTimeKey);

	auto origJson = json{{"test", "mew"}};
	auto encryptedMsg = b.encryptOlmWithRandom(genRandomData(Crypto::encryptOlmMaxRandomSize()), origJson, aIdKey);
	auto encJson = json{
	{"content",
	{
	{"algorithm", olmAlgo},
	{"ciphertext", encryptedMsg},
	{"sender_key", b.curve25519IdentityKey()}
	}
	}
	};

	auto decryptedOpt = a.decrypt(encJson);

	REQUIRE(decryptedOpt);

	auto decryptedJson = json::parse(decryptedOpt.value());

	REQUIRE(decryptedJson == origJson);

	using StrMap = immer::map<std::string, std::string>;
	auto devMap = immer::map<std::string, StrMap>()
	.set("b", StrMap().set("dev", b.curve25519IdentityKey()));

	Crypto aClone{a};

	auto devices = a.devicesMissingOutboundSessionKey(devMap);
	auto devicesAClone = aClone.devicesMissingOutboundSessionKey(devMap);

	// No device should be missing an olm session, as A has received an
	// inbound olm session before.
	auto expected = immer::map<std::string, immer::flex_vector<std::string>>();

	REQUIRE(devices == expected);
	REQUIRE(devicesAClone == expected);
	}

	TEST_CASE("Encrypt and decrypt AES-256-CTR", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);
	auto desc2 = desc;

	std::string original = "test for aes-256-ctr";

	auto encrypted = desc.processInPlace(original);

	auto decrypted = desc2.processInPlace(encrypted);

	REQUIRE(original == decrypted);
	}

	TEST_CASE("Encrypt and decrypt AES-256-CTR with any sequence type", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);
	auto desc2 = desc;

	std::string oStr = "test for aes-256-ctr";
	std::vector<unsigned char> original(oStr.begin(), oStr.end());

	auto encrypted = desc.processInPlace(original);

	auto decrypted = desc2.processInPlace(encrypted);

	REQUIRE(original == decrypted);
	}

	TEST_CASE("Encrypt and decrypt AES-256-CTR in a non-destructive way", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);

	std::string original = "test for aes-256-ctr";

	auto [next, encrypted] = desc.process(original);

	auto [next2, encrypted2] = desc.process(original);

	REQUIRE(encrypted == encrypted2);

	auto [next3, decrypted] = desc.process(encrypted);

	REQUIRE(original == decrypted);
	}

	TEST_CASE("Encrypt and decrypt AES-256-CTR in batches", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);

	std::string original = "test for aes-256-ctr";

	std::string orig2 = "another test string...";

	auto [next, encrypted] = desc.process(original);
	auto [next2, encrypted2] = next.process(orig2);

	auto [next3, decrypted] = desc.process(encrypted + encrypted2);

	REQUIRE(original + orig2 == decrypted);
	}

	TEST_CASE("AES-256-CTR should be movable", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);

	auto desc2 = std::move(desc);

	REQUIRE(desc2.valid());
	REQUIRE(! desc.valid());

	std::string original = "test for aes-256-ctr";

	std::string encrypted;

	// Can be moved from itself
	#pragma GCC diagnostic push
	#pragma GCC diagnostic ignored "-Wself-move"
	desc2 = std::move(desc2);
	#pragma GCC diagnostic pop
	REQUIRE(desc2.valid());

	std::tie(desc2, encrypted) = std::move(desc2).process(original);

	REQUIRE(desc2.valid());
	}

	TEST_CASE("AES-256-CTR should be copyable", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);

	auto desc2 = desc;

	REQUIRE(desc2.valid());
	REQUIRE(desc.valid());

	desc = AES256CTRDesc::fromRandom(RandomData{});

	std::string original = "test for aes-256-ctr";

	std::string encrypted;

	REQUIRE(desc2.valid());

	std::tie(desc2, encrypted) = desc2.process(original);

	REQUIRE(desc2.valid());
	}

	TEST_CASE("Construct AES-256-CTR from known key and iv", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);

	auto desc2 = AES256CTRDesc(desc.key(), desc.iv());

	REQUIRE(desc2.valid());
	REQUIRE(desc.key() == desc2.key());
	REQUIRE(desc.iv() == desc2.iv());
	}

	TEST_CASE("AES-256-CTR validity check", "[crypto][aes256ctr]")
	{
	SECTION("Not enough random, should reject") {
	ByteArray random = genRandom(AES256CTRDesc::randomSize - 1);

	auto desc = AES256CTRDesc::fromRandom(random);

	REQUIRE(! desc.valid());
	}

	SECTION("More than enough random, should accept") {
	ByteArray random = genRandom(AES256CTRDesc::randomSize + 1);

	auto desc = AES256CTRDesc::fromRandom(random);

	REQUIRE(desc.valid());
	}

	}

	TEST_CASE("AES256CTRDesc::fromRandom() should leave the lower 8 bytes as 0 for the counter", "[crypto][aes256ctr]")
	{
	auto r = genRandom(AES256CTRDesc::randomSize);

	auto desc = AES256CTRDesc::fromRandom(r);
	auto iv = decodeBase64(desc.iv());
	REQUIRE(iv.size() == AES256CTRDesc::ivSize);
	REQUIRE(std::all_of(iv.begin() + AES256CTRDesc::ivSizeInit, iv.end(), [](auto ch) { return ch == 0; }));
	auto desc2 = desc;

	std::string original = "test for aes-256-ctr";

	auto encrypted = desc.processInPlace(original);

	auto decrypted = desc2.processInPlace(encrypted);

	REQUIRE(original == decrypted);
	}

	TEST_CASE("Base64 encoder and decoder", "[crypto][base64]")
	{
	std::string orig = "The Quick Brown Fox Jumps Over the Lazy Dog";
	// no padding
	std::string expected = "VGhlIFF1aWNrIEJyb3duIEZveCBKdW1wcyBPdmVyIHRoZSBMYXp5IERvZw";
	std::string encoded = encodeBase64(orig);
	REQUIRE(encoded == expected);

	std::string decoded = decodeBase64(encoded);
	REQUIRE(decoded == orig);
	}

	TEST_CASE("Urlsafe base64 encoder and decoder", "[crypto][base64]")
	{
	std::string orig = "The Quick Brown Fox Jumps Over the Lazy Dog";
	// no padding
	std::string expected = "VGhlIFF1aWNrIEJyb3duIEZveCBKdW1wcyBPdmVyIHRoZSBMYXp5IERvZw";
	std::string encoded = encodeBase64(orig, Base64Opts::urlSafe);
	REQUIRE(encoded == expected);

	std::string decoded = decodeBase64(encoded, Base64Opts::urlSafe);
	REQUIRE(decoded == orig);
	}

	TEST_CASE("Base64 encoder and decoder, example from Matrix specs", "[crypto][base64]")
	{
	std::string orig = "JGLn/yafz74HB2AbPLYJWIVGnKAtqECOBf11yyXac2Y";

	std::string decoded = decodeBase64(orig);
	std::string encoded = encodeBase64(decoded);
	REQUIRE(encoded == orig);
	}

	TEST_CASE("Urlsafe base64 encoder and decoder, example from Matrix specs", "[crypto][base64]")
	{
	std::string orig = "JGLn_yafz74HB2AbPLYJWIVGnKAtqECOBf11yyXac2Y";

	std::string decoded = decodeBase64(orig, Base64Opts::urlSafe);
	std::string encoded = encodeBase64(decoded, Base64Opts::urlSafe);
	REQUIRE(encoded == orig);
	}

	TEST_CASE("SHA256 hashing support", "[crypto][sha256]")
	{
	auto hash = SHA256Desc{};

	auto message1 = std::string("12345678910");
	hash.processInPlace(message1);

	auto res = hash.get();
	auto expected = std::string("Y2QCZISah8kDVhKdmeoWXjeqX6vB/qRpBt8afKUNtJI");

	REQUIRE(res == expected);
	}

	TEST_CASE("SHA256 hashing streaming", "[crypto][sha256]")
	{
	auto hash = SHA256Desc{};

	auto message1 = std::string("12345678910");
	auto message2 = std::string("abcdefghijklmn");
	hash.processInPlace(message1);
	hash.processInPlace(message2);

	auto res = hash.get();

	auto hash2 = SHA256Desc{};

	hash2.processInPlace(message1 + message2);
	auto expected = hash2.get();

	REQUIRE(res == expected);
	}

	TEST_CASE("SHA256Desc should be copyable", "[crypto][sha256]")
	{
	auto hash = SHA256Desc{};

	auto message1 = std::string("12345678910");
	auto message2 = std::string("abcdefghijklmn");
	hash.processInPlace(message1);

	auto hash2 = hash;

	hash.processInPlace(message2);
	hash2.processInPlace(message2);

	auto res = hash.get();
	auto res2 = hash2.get();

	REQUIRE(res == res2);
	}

	TEST_CASE("SHA256Desc should be self-copyable and -movable", "[crypto][sha256]")
	{
	auto hash = SHA256Desc{};

	auto message1 = std::string("12345678910");
	hash = hash.process(message1);

	auto message2 = std::string("abcdefghijklmn");
	hash = std::move(hash).process(message2);

	auto hash2 = SHA256Desc{};

	hash2.processInPlace(message1 + message2);

	auto res = hash.get();
	auto res2 = hash2.get();

	REQUIRE(res == res2);
	}

	TEST_CASE("SHA256 should accept any range type", "[crypto][sha256]")
	{
	std::string msg = "12345678910";
	std::vector<char> arr(msg.begin(), msg.end());

	auto hash = SHA256Desc{};

	auto res1 = hash.process(arr).get();

	auto res2 = std::move(hash).process(arr).get();

	// after moving, hash is no longer valid, reset it here
	hash = SHA256Desc{};

	hash.processInPlace(arr);
	auto res3 = hash.get();

	hash = SHA256Desc{};
	auto reference = hash.process(msg).get();

	REQUIRE(res1 == res2);
	REQUIRE(res1 == res3);
	REQUIRE(res1 == reference);
	}

	TEST_CASE("Crypto::createInboundGroupSession should not allow session key replacement attacks", "[crypto][group-session]")
	{
	std::string roomId = "!someroom:example.com";
	Crypto a(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	// creating a outbound group session will add it to inbound group sessions
	auto initialKey = a.rotateMegOlmSessionWithRandom(
	genRandomData(Crypto::rotateMegOlmSessionRandomSize()),
	0,
	roomId
	);

	// encrypt to get the session id
	auto plainText = R"({
	"content": {},
	"type": "m.room.message",
	"room_id": "!someroom:example.com"
	})"_json;
	auto encryptedContent = a.encryptMegOlm(plainText);
	auto encryptedEvent = json{
	{"event_id", "$some-event-id1"},
	{"origin_server_ts", 1719196953000},
	{"content", encryptedContent},
	{"type", "m.room.encrypted"},
	{"room_id", roomId},
	};

	// message index is currently at 1
	auto currentKey = a.outboundGroupSessionCurrentKey(roomId);

	auto sessionId = encryptedContent["session_id"].template get<std::string>();

	auto plainText2 = R"({
	"content": {"a": "b"},
	"type": "m.room.message",
	"room_id": "!someroom:example.com"
	})"_json;
	auto encryptedContent2 = a.encryptMegOlm(plainText2);

	Crypto b(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	Crypto malice(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	auto encryptedEvent2 = json{
	{"event_id", "$some-event-id"},
	{"origin_server_ts", 1719196953000},
	{"content", encryptedContent2},
	{"type", "m.room.encrypted"},
	{"room_id", roomId},
	};

	auto keyOfSession = KeyOfGroupSession{roomId, sessionId};
	auto created = b.createInboundGroupSession(keyOfSession, currentKey, a.ed25519IdentityKey());
	REQUIRE(created);
	REQUIRE(doesDecryptTo(b, encryptedEvent2, plainText2));

	SECTION("it should reject if the identity key is not the same") {
	auto updated = b.createInboundGroupSession(keyOfSession, initialKey, malice.ed25519IdentityKey());
	REQUIRE(!updated);
	}

	SECTION("it should reject if the given session key does not belong to the same session") {
	auto anotherSessionKey = a.rotateMegOlmSessionWithRandom(
	genRandomData(Crypto::rotateMegOlmSessionRandomSize()),
	0,
	roomId
	);
	auto updated = b.createInboundGroupSession(keyOfSession, anotherSessionKey, a.ed25519IdentityKey());
	REQUIRE(!updated);
	}

	SECTION("it should prevent replay attack if merging with itself") {
	auto updated = b.createInboundGroupSession(keyOfSession, currentKey, a.ed25519IdentityKey());
	REQUIRE(updated);

	REQUIRE(doesDecryptTo(b, encryptedEvent2, plainText2));
	auto replay = encryptedEvent2;
	replay["event_id"] = "$some-other-id";
	REQUIRE(!b.decrypt(replay).has_value());
	}

	SECTION("it should prevent replay attack if session is updated") {
	auto updated = b.createInboundGroupSession(keyOfSession, initialKey, a.ed25519IdentityKey());
	REQUIRE(updated);

	REQUIRE(doesDecryptTo(b, encryptedEvent2, plainText2));
	REQUIRE(doesDecryptTo(b, encryptedEvent, plainText));
	auto replay = encryptedEvent2;
	replay["event_id"] = "$some-other-id";
	REQUIRE(!b.decrypt(replay).has_value());
	}
	}

	TEST_CASE("Crypto::hasInboundGroupSession", "[crypto][group-session]")
	{
	Crypto crypto(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	// creating a outbound group session will add it to inbound group sessions
	crypto.rotateMegOlmSessionWithRandom(
	genRandomData(Crypto::rotateMegOlmSessionRandomSize()),
	0,
	"!someroom:example.com"
	);

	// encrypt to get the session id
	auto encryptedContent = crypto.encryptMegOlm(R"({
	"content": {},
	"type": "m.room.message",
	"room_id": "!someroom:example.com"
	})"_json);

	auto sessionId = encryptedContent["session_id"].template get<std::string>();

	REQUIRE(crypto.hasInboundGroupSession(KeyOfGroupSession{
	"!someroom:example.com",
	sessionId,
	}));

	REQUIRE(!crypto.hasInboundGroupSession(KeyOfGroupSession{
	"!someroom:example.com",
	sessionId + "something something",
	}));
	}

	TEST_CASE("Crypto::decrypt(MegOlmEvent)", "[crypto][group-session]")
	{
	Crypto crypto(RandomTag{}, genRandomData(Crypto::constructRandomSize()));

	crypto.rotateMegOlmSessionWithRandom(
	genRandomData(Crypto::rotateMegOlmSessionRandomSize()),
	0,
	"!someroom:example.com"
	);

	auto plainText = R"({
	"content": {"body": "something"},
	"type": "m.room.message",
	"room_id": "!someroom:example.com"
	})"_json;
	// encrypt to get the session id
	auto encryptedContent = crypto.encryptMegOlm(plainText);

	auto encryptedEvent = json{
	{"event_id", "$some-event-id"},
	{"origin_server_ts", 1719196953000},
	{"content", encryptedContent},
	{"type", "m.room.encrypted"},
	{"room_id", "!someroom:example.com"},
	};

	REQUIRE(doesDecryptTo(crypto, encryptedEvent, plainText));
	}

	TEST_CASE("KeyOfGroupSession serialization", "[crypto][group-session]")
	{
	{
	auto k = KeyOfGroupSession{"!someroom:example.com", "some-session-id"};
	json j = k;
	REQUIRE(j == json{
	{"roomId", "!someroom:example.com"},
	{"sessionId", "some-session-id"},
	});
	}

	{
	json j{
	{"roomId", "!someroom:example.com"},
	{"senderKey", "some-key"}, // legacy version
	{"sessionId", "some-session-id"},
	};
	auto k = j.template get<KeyOfGroupSession>();
	REQUIRE(k == KeyOfGroupSession{"!someroom:example.com", "some-session-id"});
	}
	}
	+
	+TEST_CASE("Crypto::decrypt() should not throw when event is malformed")
	+{
	+ Crypto a(RandomTag{}, genRandomData(Crypto::constructRandomSize()));
	+ SECTION("event with no content") {
	+ auto res = a.decrypt(json::object());
	+ REQUIRE(!res.has_value());
	+ REQUIRE(res.reason() == "Malformed event");
	+ }
	+
	+ SECTION("decrypt malformed olm") {
	+ auto res = a.decrypt(json{
	+ {"content", {
	+ {"algorithm", "m.olm.v1.curve25519-aes-sha2"},
	+ }},
	+ });
	+ REQUIRE(!res.has_value());
	+ REQUIRE(res.reason() == "Malformed event");
	+ }
	+
	+ SECTION("decrypt malformed megolm") {
	+ auto res = a.decrypt(json{
	+ {"content", {
	+ {"algorithm", "m.megolm.v1.aes-sha2"},
	+ }},
	+ });
	+ REQUIRE(!res.has_value());
	+ REQUIRE(res.reason() == "Malformed event");
	+ }
	+}

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