D161.1732499755.diff
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	diff --git a/CMakeLists.txt b/CMakeLists.txt
	--- a/CMakeLists.txt
	+++ b/CMakeLists.txt
	@@ -90,7 +90,6 @@
	set(CRYPTOPP_TARGET_NAME cryptopp)
	endif()

	-find_package(Olm REQUIRED)
	find_package(vodozemac REQUIRED)

	if(libkazv_BUILD_EXAMPLES)
	diff --git a/cmake/libkazvConfig.cmake b/cmake/libkazvConfig.cmake
	--- a/cmake/libkazvConfig.cmake
	+++ b/cmake/libkazvConfig.cmake
	@@ -4,7 +4,6 @@
	find_dependency(Immer)
	find_dependency(Zug)
	find_dependency(Lager)
	-find_dependency(Olm)

	set(_oldCmakeModulePath ${CMAKE_MODULE_PATH})
	set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}" ${CMAKE_MODULE_PATH})
	diff --git a/src/crypto/CMakeLists.txt b/src/crypto/CMakeLists.txt
	--- a/src/crypto/CMakeLists.txt
	+++ b/src/crypto/CMakeLists.txt
	@@ -13,7 +13,7 @@
	add_library(libkazv::kazvcrypto ALIAS kazvcrypto)
	set_target_properties(kazvcrypto PROPERTIES VERSION ${libkazv_VERSION_STRING} SOVERSION ${libkazv_SOVERSION})

	-target_link_libraries(kazvcrypto PUBLIC kazvbase Olm::Olm ${CRYPTOPP_TARGET_NAME})
	+target_link_libraries(kazvcrypto PUBLIC kazvbase ${CRYPTOPP_TARGET_NAME})
	target_link_libraries(kazvcrypto PRIVATE vodozemac::vodozemac)

	target_include_directories(kazvcrypto PRIVATE .)
	diff --git a/src/crypto/crypto-p.hpp b/src/crypto/crypto-p.hpp
	--- a/src/crypto/crypto-p.hpp
	+++ b/src/crypto/crypto-p.hpp
	@@ -7,12 +7,13 @@
	#pragma once
	#include <libkazv-config.hpp>

	-#include <olm/olm.h>
	+#include <vodozemac.h>

	#include <unordered_map>

	#include "crypto.hpp"
	#include "crypto-util.hpp"
	+#include "crypto-util-p.hpp"
	#include "session.hpp"
	#include "inbound-group-session.hpp"
	#include "outbound-group-session.hpp"
	@@ -28,8 +29,7 @@
	CryptoPrivate(const CryptoPrivate &that);
	~CryptoPrivate();

	- ByteArray accountData;
	- OlmAccount *account;
	+ std::optional<rust::Box<vodozemac::olm::Account>> account;
	immer::map<std::string /* algorithm */, int> uploadedOneTimeKeysCount;
	int numUnpublishedKeys{0};
	std::unordered_map<std::string /* theirCurve25519IdentityKey */, Session> knownSessions;
	@@ -37,21 +37,15 @@

	std::unordered_map<std::string /* roomId */, OutboundGroupSession> outboundGroupSessions;

	- ByteArray utilityData;
	- OlmUtility *utility;
	bool valid{true};

	- std::size_t checkUtilError(std::size_t code) const;
	-
	std::string pickle() const;
	- void unpickle(std::string data);
	+ bool unpickle(std::string data);
	+ bool unpickleFromLibolm(std::string data);

	- ByteArray identityKeys() const;
	std::string ed25519IdentityKey() const;
	std::string curve25519IdentityKey() const;

	- std::size_t checkError(std::size_t code) const;
	-
	MaybeString decryptOlm(nlohmann::json content);
	// Here we need the full event for eventId and originServerTs
	MaybeString decryptMegOlm(nlohmann::json eventJson);
	diff --git a/src/crypto/crypto.hpp b/src/crypto/crypto.hpp
	--- a/src/crypto/crypto.hpp
	+++ b/src/crypto/crypto.hpp
	@@ -254,7 +254,7 @@
	private:

	friend class Session;
	- friend class SessionPrivate;
	+ friend struct SessionPrivate;
	std::unique_ptr<CryptoPrivate> m_d;
	};
	}
	diff --git a/src/crypto/crypto.cpp b/src/crypto/crypto.cpp
	--- a/src/crypto/crypto.cpp
	+++ b/src/crypto/crypto.cpp
	@@ -10,7 +10,7 @@

	#include <zug/transducer/filter.hpp>

	-#include <olm/olm.h>
	+#include <vodozemac.h>

	#include <nlohmann/json.hpp>

	@@ -21,7 +21,7 @@

	#include "crypto-p.hpp"
	#include "session-p.hpp"
	-
	+#include "crypto-util-p.hpp"
	#include "crypto-util.hpp"
	#include "time-util.hpp"

	@@ -30,77 +30,64 @@
	using namespace CryptoConstants;

	CryptoPrivate::CryptoPrivate()
	- : accountData(olm_account_size(), 0)
	- , account(olm_account(accountData.data()))
	- , utilityData(olm_utility_size(), '\0')
	- , utility(olm_utility(utilityData.data()))
	+ : account(std::nullopt)
	, valid(false)
	{
	}

	- CryptoPrivate::CryptoPrivate(RandomTag, RandomData data)
	- : accountData(olm_account_size(), 0)
	- , account(olm_account(accountData.data()))
	- , utilityData(olm_utility_size(), '\0')
	- , utility(olm_utility(utilityData.data()))
	+ CryptoPrivate::CryptoPrivate(RandomTag, [[maybe_unused]] RandomData data)
	+ : account(std::nullopt)
	+ , valid(true)
	{
	- auto randLenNeeded = Crypto::constructRandomSize();
	- checkError(olm_create_account(account, data.data(), randLenNeeded));
	+ account = vodozemac::olm::new_account();
	}


	CryptoPrivate::~CryptoPrivate()
	{
	- olm_clear_account(account);
	}

	CryptoPrivate::CryptoPrivate(const CryptoPrivate &that)
	- : accountData(olm_account_size(), 0)
	- , account(olm_account(accountData.data()))
	+ : account(std::nullopt)
	, uploadedOneTimeKeysCount(that.uploadedOneTimeKeysCount)
	, numUnpublishedKeys(that.numUnpublishedKeys)
	, knownSessions(that.knownSessions)
	, inboundGroupSessions(that.inboundGroupSessions)
	, outboundGroupSessions(that.outboundGroupSessions)
	- , utilityData(olm_utility_size(), '\0')
	- , utility(olm_utility(utilityData.data()))
	{
	- unpickle(that.pickle());
	+ if (that.valid) {
	+ valid = unpickle(that.pickle());
	+ }
	}

	std::string CryptoPrivate::pickle() const
	{
	- auto key = ByteArray(3, 'x');
	- auto pickleData = std::string(olm_pickle_account_length(account), '\0');
	- checkError(olm_pickle_account(account, key.data(), key.size(),
	- pickleData.data(), pickleData.size()));
	- return pickleData;
	+ auto pickleData = account.value()->pickle(VODOZEMAC_PICKLE_KEY);
	+ return static_cast<std::string>(pickleData);
	}

	- void CryptoPrivate::unpickle(std::string pickleData)
	+ bool CryptoPrivate::unpickle(std::string pickleData)
	{
	- auto key = ByteArray(3, 'x');
	- checkError(olm_unpickle_account(account, key.data(), key.size(),
	- pickleData.data(), pickleData.size()));
	+ account = checkVodozemacError([&]() {
	+ return vodozemac::olm::account_from_pickle(
	+ rust::Str(pickleData),
	+ VODOZEMAC_PICKLE_KEY
	+ );
	+ });
	+ return account.has_value();
	}

	- std::size_t CryptoPrivate::checkError(std::size_t code) const
	+ bool CryptoPrivate::unpickleFromLibolm(std::string pickleData)
	{
	- if (code == olm_error()) {
	- kzo.crypto.warn() << "Olm error: " << olm_account_last_error(account) << std::endl;
	- }
	- return code;
	- }
	-
	- std::size_t CryptoPrivate::checkUtilError(std::size_t code) const
	- {
	- if (code == olm_error()) {
	- kzo.crypto.warn() << "Olm utility error: " << olm_utility_last_error(utility) << std::endl;
	- }
	- return code;
	+ 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>();
	@@ -125,9 +112,13 @@

	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);
	@@ -167,11 +158,10 @@
	bool CryptoPrivate::createInboundSession(std::string theirCurve25519IdentityKey,
	std::string message)
	{
	- auto s = Session(InboundSessionTag{}, account,
	+ auto s = Session(InboundSessionTag{}, *this,
	theirCurve25519IdentityKey, message);

	if (s.valid()) {
	- checkError(olm_remove_one_time_keys(account, s.m_d->session));
	knownSessions.insert_or_assign(theirCurve25519IdentityKey, std::move(s));
	return true;
	}
	@@ -218,13 +208,7 @@

	std::size_t Crypto::constructRandomSize()
	{
	- static std::size_t s =
	- [] {
	- std::vector<char> acc(olm_account_size(), 0);
	- OlmAccount *account = olm_account(acc.data());
	- return olm_create_account_random_length(account);
	- }();
	- return s;
	+ return 0;
	}

	Crypto::Crypto()
	@@ -271,27 +255,16 @@
	return m_d->valid;
	}

	- ByteArray CryptoPrivate::identityKeys() const
	- {
	- auto ret = ByteArray(olm_account_identity_keys_length(account), '\0');
	- checkError(olm_account_identity_keys(account, ret.data(), ret.size()));
	- return ret;
	- }
	-
	std::string CryptoPrivate::ed25519IdentityKey() const
	{
	- auto keys = identityKeys();
	- auto keyStr = std::string(keys.begin(), keys.end());
	- auto keyJson = nlohmann::json::parse(keyStr);
	- return keyJson.at(ed25519);
	+ auto key = account.value()->ed25519_key()->to_base64();
	+ return static_cast<std::string>(key);
	}

	std::string CryptoPrivate::curve25519IdentityKey() const
	{
	- auto keys = identityKeys();
	- auto keyStr = std::string(keys.begin(), keys.end());
	- auto keyJson = nlohmann::json::parse(keyStr);
	- return keyJson.at(curve25519);
	+ auto key = account.value()->curve25519_key()->to_base64();
	+ return static_cast<std::string>(key);
	}

	std::string Crypto::ed25519IdentityKey() const
	@@ -311,15 +284,15 @@

	auto str = j.dump();

	- auto ret = ByteArray(olm_account_signature_length(m_d->account), '\0');
	+ auto signature = checkVodozemacError([&]() {
	+ return m_d->account.value()->sign(str);
	+ });

	- kzo.crypto.dbg() << "We are about to sign: " << str << std::endl;
	-
	- m_d->checkError(olm_account_sign(m_d->account,
	- str.data(), str.size(),
	- ret.data(), ret.size()));
	+ if (!signature.has_value()) {
	+ return "";
	+ }

	- return std::string{ret.begin(), ret.end()};
	+ return static_cast<std::string>(signature.value()->to_base64());
	}

	void Crypto::setUploadedOneTimeKeysCount(immer::map<std::string /* algorithm */, int> uploadedOneTimeKeysCount)
	@@ -329,51 +302,43 @@

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

	std::size_t Crypto::genOneTimeKeysRandomSize(int num)
	{
	- static std::size_t oneKeyRandomSize =
	- [] {
	- std::vector<char> acc(olm_account_size(), 0);
	- OlmAccount *account = olm_account(acc.data());
	- return olm_account_generate_one_time_keys_random_length(account, 1);
	- }();
	-
	- return oneKeyRandomSize * num;
	+ return 0;
	}

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

	- auto res = m_d->checkError(
	- olm_account_generate_one_time_keys(
	- m_d->account,
	- num,
	- random.data(), random.size()));
	-
	- if (res != olm_error()) {
	- m_d->numUnpublishedKeys += num;
	- }
	+ m_d->account.value()->generate_one_time_keys(num);
	+ m_d->numUnpublishedKeys += num;
	}


	nlohmann::json Crypto::unpublishedOneTimeKeys() const
	{
	- auto keys = ByteArray(olm_account_one_time_keys_length(m_d->account), '\0');
	- m_d->checkError(olm_account_one_time_keys(m_d->account, keys.data(), keys.size()));
	+ 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 nlohmann::json::parse(std::string(keys.begin(), keys.end()));
	+ return ret;
	}

	void Crypto::markOneTimeKeysAsPublished()
	{
	- auto ret = m_d->checkError(olm_account_mark_keys_as_published(m_d->account));
	- if (ret != olm_error()) {
	- m_d->numUnpublishedKeys = 0;
	- }
	+ m_d->account.value()->mark_keys_as_published();
	+ m_d->numUnpublishedKeys = 0;
	}

	int Crypto::numUnpublishedOneTimeKeys() const
	@@ -434,13 +399,15 @@

	auto message = object.dump();

	- auto res = m_d->checkUtilError(
	- olm_ed25519_verify(m_d->utility,
	- ed25519Key.c_str(), ed25519Key.size(),
	- message.c_str(), message.size(),
	- signature.data(), signature.size()));
	+ 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 != olm_error();
	+ return res.has_value() && res.value();
	}

	MaybeString Crypto::getInboundGroupSessionEd25519KeyFromEvent(const nlohmann::json &eventJson) const
	@@ -484,8 +451,7 @@

	std::size_t Crypto::encryptOlmMaxRandomSize()
	{
	- static std::size_t maxRandomSizeNeeded = 32;
	- return maxRandomSizeNeeded;
	+ return 0;
	}

	nlohmann::json Crypto::encryptOlmWithRandom(
	@@ -608,7 +574,7 @@
	auto session = Session(OutboundSessionTag{},
	RandomTag{},
	random,
	- m_d->account,
	+ *m_d,
	theirIdentityKey,
	theirOneTimeKey);

	@@ -623,6 +589,7 @@
	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},
	@@ -638,7 +605,13 @@
	{
	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) { m_d->unpickle(pickledData); }
	+ 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");
	diff --git a/src/crypto/session-p.hpp b/src/crypto/session-p.hpp
	--- a/src/crypto/session-p.hpp
	+++ b/src/crypto/session-p.hpp
	@@ -1,6 +1,6 @@
	/*
	* This file is part of libkazv.
	- * SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
	+ * SPDX-FileCopyrightText: 2021-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	@@ -8,42 +8,38 @@
	#include <libkazv-config.hpp>

	#include "session.hpp"
	+#include <vodozemac.h>

	namespace Kazv
	{
	struct SessionPrivate
	{
	SessionPrivate();
	- SessionPrivate(OutboundSessionTag,
	- OlmAccount *acc,
	- std::string theirIdentityKey,
	- std::string theirOneTimeKey);

	SessionPrivate(OutboundSessionTag,
	RandomTag,
	RandomData data,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string theirOneTimeKey);

	SessionPrivate(InboundSessionTag,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string message);

	SessionPrivate(const SessionPrivate &that);
	~SessionPrivate() = default;

	- ByteArray sessionData;
	- OlmSession *session{0};
	+ std::optional<rust::Box<vodozemac::olm::Session>> session;

	bool valid{false};
	+ std::optional<std::string> firstDecrypted;

	std::string pickle() const;
	bool unpickle(std::string data);
	+ bool unpickleFromLibolm(std::string data);

	- std::size_t checkError(std::size_t code) const;
	-
	- std::string error() const { return olm_session_last_error(session); }
	+ MaybeString takeFirstDecrypted();
	};
	}
	diff --git a/src/crypto/session.hpp b/src/crypto/session.hpp
	--- a/src/crypto/session.hpp
	+++ b/src/crypto/session.hpp
	@@ -10,8 +10,6 @@
	#include <memory>
	#include <tuple>

	-#include <olm/olm.h>
	-
	#include <maybe.hpp>

	#include "crypto-util.hpp"
	@@ -24,6 +22,7 @@
	struct OutboundSessionTag {};

	struct SessionPrivate;
	+ struct CryptoPrivate;
	class Session
	{
	/**
	@@ -31,13 +30,6 @@
	*/
	static std::size_t constructOutboundRandomSize();

	- // Creates an outbound session
	- [[deprecated("Use deterministic variant instead. In the future, this will be removed.")]]
	- explicit Session(OutboundSessionTag,
	- OlmAccount *acc,
	- std::string theirIdentityKey,
	- std::string theirOneTimeKey);
	-
	/**
	* Construct an outbound session with custom random data.
	*
	@@ -47,13 +39,13 @@
	explicit Session(OutboundSessionTag,
	RandomTag,
	RandomData data,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string theirOneTimeKey);

	// Creates an inbound session
	explicit Session(InboundSessionTag,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string message);

	@@ -77,9 +69,6 @@
	*/
	std::size_t encryptRandomSize() const;

	- [[deprecated("Use deterministic variant instead. In the future, this will be removed.")]]
	- std::pair<int /* type /, std::string / message */> encrypt(std::string plainText);
	-
	/**
	* Encrypt plainText.
	*
	@@ -94,8 +83,8 @@

	private:
	friend class Crypto;
	- friend class CryptoPrivate;
	- friend class SessionPrivate;
	+ friend struct CryptoPrivate;
	+ friend struct SessionPrivate;

	friend void to_json(nlohmann::json &j, const Session &s);
	friend void from_json(const nlohmann::json &j, Session &s);
	diff --git a/src/crypto/session.cpp b/src/crypto/session.cpp
	--- a/src/crypto/session.cpp
	+++ b/src/crypto/session.cpp
	@@ -6,8 +6,6 @@

	#include <libkazv-config.hpp>

	-#include <olm/olm.h>
	-
	#include <debug.hpp>

	#include "crypto-p.hpp"
	@@ -16,158 +14,137 @@

	namespace Kazv
	{
	- std::size_t SessionPrivate::checkError(std::size_t code) const
	- {
	- if (code == olm_error()) {
	- kzo.crypto.warn() << "Olm session error: " << olm_session_last_error(session) << std::endl;
	- }
	- return code;
	- }
	-
	SessionPrivate::SessionPrivate()
	- : sessionData(olm_session_size(), '\0')
	- , session(olm_session(sessionData.data()))
	- {
	- }
	-
	- SessionPrivate::SessionPrivate(OutboundSessionTag,
	- OlmAccount *acc,
	- std::string theirIdentityKey,
	- std::string theirOneTimeKey)
	- : SessionPrivate()
	+ : session(std::nullopt)
	{
	- auto random = genRandom(Session::constructOutboundRandomSize());
	-
	- auto res = checkError(olm_create_outbound_session(
	- session,
	- acc,
	- theirIdentityKey.c_str(), theirIdentityKey.size(),
	- theirOneTimeKey.c_str(), theirOneTimeKey.size(),
	- random.data(), random.size()));
	-
	- if (res != olm_error()) {
	- valid = true;
	- }
	}

	SessionPrivate::SessionPrivate(OutboundSessionTag,
	RandomTag,
	RandomData random,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string theirOneTimeKey)
	: SessionPrivate()
	{
	assert(random.size() >= Session::constructOutboundRandomSize());

	- auto res = checkError(olm_create_outbound_session(
	- session,
	- acc,
	- theirIdentityKey.c_str(), theirIdentityKey.size(),
	- theirOneTimeKey.c_str(), theirOneTimeKey.size(),
	- random.data(), random.size()));
	+ session = checkVodozemacError([&]() {
	+ auto identityKey = vodozemac::types::curve_key_from_base64(rust::Str(theirIdentityKey));
	+ auto oneTimeKey = vodozemac::types::curve_key_from_base64(rust::Str(theirOneTimeKey));
	+ return cryptoD.account.value()->create_outbound_session(
	+ *identityKey,
	+ *oneTimeKey
	+ );
	+ });

	- if (res != olm_error()) {
	- valid = true;
	- }
	+ valid = session.has_value();
	}

	SessionPrivate::SessionPrivate(InboundSessionTag,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string message)
	: SessionPrivate()
	{
	- auto res = checkError(olm_create_inbound_session_from(
	- session,
	- acc,
	- theirIdentityKey.c_str(), theirIdentityKey.size(),
	- message.data(), message.size()));
	-
	- if (res != olm_error()) {
	- valid = true;
	+ auto res = checkVodozemacError([&]() {
	+ auto identityKey = vodozemac::types::curve_key_from_base64(rust::Str(theirIdentityKey));
	+ auto msg = vodozemac::olm::olm_message_from_parts(vodozemac::olm::OlmMessageParts{
	+ 0, // pre-key message
	+ message,
	+ });
	+ return cryptoD.account.value()->create_inbound_session(
	+ *identityKey,
	+ *msg
	+ );
	+ });
	+
	+ valid = res.has_value();
	+
	+ if (valid) {
	+ session = std::move(res->session);
	+ firstDecrypted = std::string(res->plaintext.begin(), res->plaintext.end());
	}
	}

	SessionPrivate::SessionPrivate(const SessionPrivate &that)
	: SessionPrivate()
	{
	- valid = unpickle(that.pickle());
	+ if (that.valid) {
	+ valid = unpickle(that.pickle());
	+ }
	}

	std::string SessionPrivate::pickle() const
	{
	- auto pickleData = std::string(olm_pickle_session_length(session), '\0');
	- auto key = ByteArray(3, 'x');
	- checkError(olm_pickle_session(session,
	- key.data(), key.size(),
	- pickleData.data(), pickleData.size()));
	- return pickleData;
	+ auto pickleData = session.value()->pickle(VODOZEMAC_PICKLE_KEY);
	+ return static_cast<std::string>(pickleData);
	}

	bool SessionPrivate::unpickle(std::string pickleData)
	{
	- auto key = ByteArray(3, 'x');
	- auto res = checkError(olm_unpickle_session(
	- session,
	- key.data(), key.size(),
	- pickleData.data(), pickleData.size()));
	+ session = checkVodozemacError([&]() {
	+ return vodozemac::olm::session_from_pickle(pickleData, VODOZEMAC_PICKLE_KEY);
	+ });

	- return res != olm_error();
	+ return session.has_value();
	}

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

	- std::size_t Session::constructOutboundRandomSize()
	+ MaybeString SessionPrivate::takeFirstDecrypted()
	{
	- static size_t s =
	- [] {
	- ByteArray sessionData(olm_session_size(), '\0');
	- OlmSession *session(olm_session(sessionData.data()));
	- return olm_create_outbound_session_random_length(session);
	- }();
	- return s;
	+ auto res = std::move(firstDecrypted);
	+ firstDecrypted = std::nullopt;
	+ if (res.has_value()) {
	+ return res.value();
	+ } else {
	+ return NotBut("No first decrypted available");
	+ }
	}

	- Session::Session()
	- : m_d(new SessionPrivate)
	+ std::size_t Session::constructOutboundRandomSize()
	{
	+ return 0;
	}

	- Session::Session(OutboundSessionTag,
	- OlmAccount *acc,
	- std::string theirIdentityKey,
	- std::string theirOneTimeKey)
	- : m_d(new SessionPrivate{
	- OutboundSessionTag{},
	- acc,
	- theirIdentityKey,
	- theirOneTimeKey})
	+ Session::Session()
	+ : m_d(new SessionPrivate)
	{
	}

	Session::Session(OutboundSessionTag,
	RandomTag,
	RandomData data,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string theirOneTimeKey)
	: m_d(new SessionPrivate{
	OutboundSessionTag{},
	RandomTag{},
	std::move(data),
	- acc,
	+ cryptoD,
	theirIdentityKey,
	theirOneTimeKey})
	{
	}

	Session::Session(InboundSessionTag,
	- OlmAccount *acc,
	+ CryptoPrivate &cryptoD,
	std::string theirIdentityKey,
	std::string theirOneTimeKey)
	: m_d(new SessionPrivate{
	InboundSessionTag{},
	- acc,
	+ cryptoD,
	theirIdentityKey,
	theirOneTimeKey})
	{
	@@ -200,11 +177,15 @@

	bool Session::matches(std::string message)
	{
	- auto res = m_d->checkError(
	- olm_matches_inbound_session(m_d->session, message.data(), message.size()));
	-
	- // if match, returns 1
	- return res == 1;
	+ auto res = checkVodozemacError([&]() {
	+ auto msg = vodozemac::olm::olm_message_from_parts(vodozemac::olm::OlmMessageParts{
	+ 0, // pre-key
	+ message,
	+ });
	+ return m_d->session.value()->session_matches(*msg);
	+ });
	+
	+ return res.has_value() && res.value();
	}

	bool Session::valid() const
	@@ -215,65 +196,48 @@

	MaybeString Session::decrypt(int type, std::string message)
	{
	- auto msgBuffer = ByteArray(message.begin(), message.end());
	-
	- auto size = m_d->checkError(olm_decrypt_max_plaintext_length(
	- m_d->session, type, msgBuffer.data(), msgBuffer.size()));
	-
	- if (size == olm_error()) {
	- return NotBut(m_d->error());
	- }
	-
	- auto plainTextBuffer = ByteArray(size, '\0');
	-
	- auto actualSize = m_d->checkError(
	- olm_decrypt(m_d->session, type,
	- message.data(), message.size(),
	- plainTextBuffer.data(), plainTextBuffer.size()));
	-
	- if (actualSize == olm_error()) {
	- return NotBut(m_d->error());
	+ auto res = checkVodozemacError([&]() {
	+ auto msg = vodozemac::olm::olm_message_from_parts(vodozemac::olm::OlmMessageParts{
	+ static_cast<std::size_t>(type),
	+ message,
	+ });
	+ return m_d->session.value()->decrypt(*msg);
	+ });
	+
	+ if (!res.has_value()) {
	+ return NotBut(res.reason());
	}

	- return std::string(plainTextBuffer.begin(), plainTextBuffer.begin() + actualSize);
	+ return std::string(res.value().begin(), res.value().end());
	}

	std::size_t Session::encryptRandomSize() const
	{
	- return olm_encrypt_random_length(m_d->session);
	- }
	-
	- std::pair<int, std::string> Session::encrypt(std::string plainText)
	- {
	- return encryptWithRandom(genRandomData(encryptRandomSize()), std::move(plainText));
	+ return 0;
	}

	std::pair<int, std::string> Session::encryptWithRandom(RandomData random, std::string plainText)
	{
	assert(random.size() >= encryptRandomSize());

	- auto type = m_d->checkError(olm_encrypt_message_type(m_d->session));
	-
	- auto size = m_d->checkError(olm_encrypt_message_length(m_d->session, plainText.size()));
	+ auto res = checkVodozemacError([&]() {
	+ return m_d->session.value()->encrypt(plainText);
	+ });

	- auto buf = ByteArray(size, '\0');
	-
	- auto actualSize = m_d->checkError(
	- olm_encrypt(m_d->session, plainText.c_str(), plainText.size(),
	- random.data(), random.size(),
	- buf.data(), buf.size()));
	-
	- if (actualSize != olm_error()) {
	- return { type, std::string(buf.begin(), buf.begin() + actualSize) };
	+ if (!res.has_value()) {
	+ return { -1, "" };
	}

	- return { -1, "" };
	+ auto [type, msg] = res.value()->to_parts();
	+
	+ return { type, static_cast<std::string>(msg) };
	}

	void to_json(nlohmann::json &j, const Session &s)
	{
	j = nlohmann::json::object({
	{"valid", s.m_d->valid},
	+ {"version", 1},
	{"data", s.m_d->valid ? s.m_d->pickle() : std::string()}
	});
	}
	@@ -281,7 +245,11 @@
	void from_json(const nlohmann::json &j, Session &s)
	{
	if (j.at("valid").template get<bool>()) {
	- s.m_d->valid = s.m_d->unpickle(j.at("data"));
	+ if (j.contains("version") && j["version"] == 1) {
	+ s.m_d->valid = s.m_d->unpickle(j.at("data"));
	+ } else {
	+ s.m_d->valid = s.m_d->unpickleFromLibolm(j.at("data"));
	+ }
	}
	}

	diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
	--- a/src/tests/CMakeLists.txt
	+++ b/src/tests/CMakeLists.txt
	@@ -108,9 +108,9 @@

	libkazv_add_tests(
	crypto-test.cpp
	- crypto/deterministic-test.cpp
	crypto/inbound-group-session-test.cpp
	crypto/outbound-group-session-test.cpp
	+ crypto/session-test.cpp
	EXTRA_LINK_LIBRARIES kazvcrypto
	)

	diff --git a/src/tests/crypto-test.cpp b/src/tests/crypto-test.cpp
	--- a/src/tests/crypto-test.cpp
	+++ b/src/tests/crypto-test.cpp
	@@ -19,6 +19,7 @@
	#include <aes-256-ctr.hpp>
	#include <base64.hpp>
	#include <sha256.hpp>
	+#include "crypto/crypto-test-resource.hpp"

	using namespace Kazv;
	using namespace Kazv::CryptoConstants;
	@@ -26,6 +27,17 @@
	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)
	{
	@@ -51,6 +63,46 @@
	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()));
	diff --git a/src/tests/crypto/deterministic-test.cpp b/src/tests/crypto/deterministic-test.cpp
	deleted file mode 100644
	--- a/src/tests/crypto/deterministic-test.cpp
	+++ /dev/null
	@@ -1,41 +0,0 @@
	-/*
	- * This file is part of libkazv.
	- * SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
	- * SPDX-License-Identifier: AGPL-3.0-or-later
	- */
	-
	-#include <libkazv-config.hpp>
	-
	-
	-#include <catch2/catch_all.hpp>
	-
	-#include <crypto.hpp>
	-#include <outbound-group-session.hpp>
	-#include <client/random-generator.hpp>
	-
	-using namespace Kazv;
	-
	-TEST_CASE("Deterministic constructors of Crypto", "[crypto][deterministic]")
	-{
	- auto rg = RandomInterface{RandomDeviceGenerator{}};
	- auto random = rg.generateRange<RandomData>(Crypto::constructRandomSize());
	- Crypto crypto1(RandomTag{}, random);
	- Crypto crypto2(RandomTag{}, random);
	-
	- REQUIRE(crypto1.toJson() == crypto2.toJson());
	-}
	-
	-TEST_CASE("Deterministic generating of one-time keys", "[crypto][deterministic]")
	-{
	- auto rg = RandomInterface{RandomDeviceGenerator{}};
	- auto random = rg.generateRange<RandomData>(Crypto::constructRandomSize());
	- Crypto crypto1(RandomTag{}, random);
	- Crypto crypto2(crypto1);
	-
	- auto numKeysToGen = 2;
	- random = rg.generateRange<RandomData>(Crypto::genOneTimeKeysRandomSize(numKeysToGen));
	- crypto1.genOneTimeKeysWithRandom(random, numKeysToGen);
	- crypto2.genOneTimeKeysWithRandom(random, numKeysToGen);
	-
	- REQUIRE(crypto1.toJson() == crypto2.toJson());
	-}
	diff --git a/src/tests/crypto/session-test.cpp b/src/tests/crypto/session-test.cpp
	new file mode 100644
	--- /dev/null
	+++ b/src/tests/crypto/session-test.cpp
	@@ -0,0 +1,79 @@
	+/*
	+ * This file is part of libkazv.
	+ * SPDX-FileCopyrightText: 2024 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+#include <libkazv-config.hpp>
	+#include <catch2/catch_test_macros.hpp>
	+#include <session.hpp>
	+#include <crypto.hpp>
	+#include "crypto-test-resource.hpp"
	+
	+using namespace Kazv;
	+
	+static const auto resource = cryptoDumpResource();
	+static const auto sessionAJson = resource["a"]["knownSessions"]["wklSkg9T1gz0pnYDZUmKrVqQXEDGW8HnQV0JDWqzYVs"];
	+static const auto sessionBJson = resource["b"]["knownSessions"]["L75F3cTDIM/bw/n11zm73o0+LpNZ5ll+FCbCH8+OETQ"];
	+
	+TEST_CASE("Session conversion from libolm to vodozemac")
	+{
	+ auto sessionA = sessionAJson.template get<Session>();
	+
	+ auto sessionB = sessionBJson.template get<Session>();
	+
	+ REQUIRE(sessionA.valid());
	+ REQUIRE(sessionB.valid());
	+
	+ {
	+ auto [type, message] = sessionA.encryptWithRandom(genRandomData(sessionA.encryptRandomSize()), "mew 1");
	+ auto res = sessionB.decrypt(type, message);
	+ REQUIRE(res.has_value());
	+ REQUIRE(res.value() == "mew 1");
	+ }
	+
	+ {
	+ auto [type, message] = sessionB.encryptWithRandom(genRandomData(sessionA.encryptRandomSize()), "mew 2");
	+ auto res = sessionA.decrypt(type, message);
	+ REQUIRE(res.has_value());
	+ REQUIRE(res.value() == "mew 2");
	+ }
	+}
	+
	+TEST_CASE("Session::from_json error handling")
	+{
	+ auto j = sessionAJson;
	+ j["data"] = "AAAAAAAAAA";
	+ auto sessionA = j.template get<Session>();
	+
	+ REQUIRE(!sessionA.valid());
	+}
	+
	+TEST_CASE("Session::decrypt error handling")
	+{
	+ auto sessionA = sessionAJson.template get<Session>();
	+
	+ auto res = sessionA.decrypt(1, "xxx");
	+ REQUIRE(!res.has_value());
	+}
	+
	+TEST_CASE("Session serialization roundtrip")
	+{
	+ auto sessionA = sessionAJson.template get<Session>();
	+ auto j = json(sessionA);
	+ sessionA = j.template get<Session>();
	+
	+ auto sessionB = sessionBJson.template get<Session>();
	+ j = json(sessionB);
	+ sessionB = j.template get<Session>();
	+
	+ REQUIRE(sessionA.valid());
	+ REQUIRE(sessionB.valid());
	+
	+ {
	+ auto [type, message] = sessionA.encryptWithRandom(genRandomData(sessionA.encryptRandomSize()), "mew 1");
	+ auto res = sessionB.decrypt(type, message);
	+ REQUIRE(res.has_value());
	+ REQUIRE(res.value() == "mew 1");
	+ }
	+}

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