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// SPDX-FileCopyrightText: 2021 Carl Schwan <carlschwan@kde.org>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#ifdef Quotient_E2EE_ENABLED
#include "crypto/qolmoutboundsession.h"
#include "crypto/utils.h"
using namespace Quotient;
OlmError lastError(OlmOutboundGroupSession *session) {
const std::string error_raw = olm_outbound_group_session_last_error(session);
return fromString(error_raw);
}
QOlmOutboundGroupSession::QOlmOutboundGroupSession(OlmOutboundGroupSession *session)
: m_groupSession(session)
{
}
QOlmOutboundGroupSession::~QOlmOutboundGroupSession()
{
olm_clear_outbound_group_session(m_groupSession);
delete[](reinterpret_cast<uint8_t *>(m_groupSession));
}
std::unique_ptr<QOlmOutboundGroupSession> QOlmOutboundGroupSession::create()
{
auto *olmOutboundGroupSession = olm_outbound_group_session(new uint8_t[olm_outbound_group_session_size()]);
const auto randomLen = olm_init_outbound_group_session_random_length(olmOutboundGroupSession);
QByteArray randomBuf = getRandom(randomLen);
const auto error = olm_init_outbound_group_session(olmOutboundGroupSession,
reinterpret_cast<uint8_t *>(randomBuf.data()), randomBuf.length());
if (error == olm_error()) {
throw lastError(olmOutboundGroupSession);
}
const auto keyMaxLength = olm_outbound_group_session_key_length(olmOutboundGroupSession);
QByteArray keyBuffer(keyMaxLength, '0');
olm_outbound_group_session_key(olmOutboundGroupSession, reinterpret_cast<uint8_t *>(keyBuffer.data()),
keyMaxLength);
randomBuf.clear();
return std::make_unique<QOlmOutboundGroupSession>(olmOutboundGroupSession);
}
std::variant<QByteArray, OlmError> QOlmOutboundGroupSession::pickle(const PicklingMode &mode)
{
QByteArray pickledBuf(olm_pickle_outbound_group_session_length(m_groupSession), '0');
QByteArray key = toKey(mode);
const auto error = olm_pickle_outbound_group_session(m_groupSession, key.data(), key.length(),
pickledBuf.data(), pickledBuf.length());
if (error == olm_error()) {
return lastError(m_groupSession);
}
key.clear();
return pickledBuf;
}
std::variant<std::unique_ptr<QOlmOutboundGroupSession>, OlmError> QOlmOutboundGroupSession::unpickle(QByteArray &pickled, const PicklingMode &mode)
{
QByteArray pickledBuf = pickled;
auto *olmOutboundGroupSession = olm_outbound_group_session(new uint8_t[olm_outbound_group_session_size()]);
QByteArray key = toKey(mode);
const auto error = olm_unpickle_outbound_group_session(olmOutboundGroupSession, key.data(), key.length(),
pickled.data(), pickled.length());
if (error == olm_error()) {
return lastError(olmOutboundGroupSession);
}
const auto idMaxLength = olm_outbound_group_session_id_length(olmOutboundGroupSession);
QByteArray idBuffer(idMaxLength, '0');
olm_outbound_group_session_id(olmOutboundGroupSession, reinterpret_cast<uint8_t *>(idBuffer.data()),
idBuffer.length());
key.clear();
return std::make_unique<QOlmOutboundGroupSession>(olmOutboundGroupSession);
}
std::variant<QByteArray, OlmError> QOlmOutboundGroupSession::encrypt(const QString &plaintext)
{
QByteArray plaintextBuf = plaintext.toUtf8();
const auto messageMaxLen = olm_group_encrypt_message_length(m_groupSession, plaintextBuf.length());
QByteArray messageBuf(messageMaxLen, '0');
const auto error = olm_group_encrypt(m_groupSession, reinterpret_cast<uint8_t *>(plaintextBuf.data()),
plaintextBuf.length(), reinterpret_cast<uint8_t *>(messageBuf.data()), messageBuf.length());
if (error == olm_error()) {
return lastError(m_groupSession);
}
return messageBuf;
}
uint32_t QOlmOutboundGroupSession::sessionMessageIndex() const
{
return olm_outbound_group_session_message_index(m_groupSession);
}
QByteArray QOlmOutboundGroupSession::sessionId() const
{
const auto idMaxLength = olm_outbound_group_session_id_length(m_groupSession);
QByteArray idBuffer(idMaxLength, '0');
const auto error = olm_outbound_group_session_id(m_groupSession, reinterpret_cast<uint8_t *>(idBuffer.data()),
idBuffer.length());
if (error == olm_error()) {
throw lastError(m_groupSession);
}
return idBuffer;
}
std::variant<QByteArray, OlmError> QOlmOutboundGroupSession::sessionKey() const
{
const auto keyMaxLength = olm_outbound_group_session_key_length(m_groupSession);
QByteArray keyBuffer(keyMaxLength, '0');
const auto error = olm_outbound_group_session_key(m_groupSession, reinterpret_cast<uint8_t *>(keyBuffer.data()),
keyMaxLength);
if (error == olm_error()) {
return lastError(m_groupSession);
}
return keyBuffer;
}
#endif
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