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// SPDX-FileCopyrightText: 2021 Carl Schwan <carlschwan@kde.org>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#include "crypto/qolminboundsession.h"
#include <iostream>
#include <cstring>
using namespace Quotient;
QOlmError lastError(OlmInboundGroupSession *session) {
const std::string error_raw = olm_inbound_group_session_last_error(session);
return fromString(error_raw);
}
QOlmInboundGroupSession::QOlmInboundGroupSession(OlmInboundGroupSession *session)
: m_groupSession(session)
{
}
QOlmInboundGroupSession::~QOlmInboundGroupSession()
{
olm_clear_inbound_group_session(m_groupSession);
//delete[](reinterpret_cast<uint8_t *>(m_groupSession));
}
std::unique_ptr<QOlmInboundGroupSession> QOlmInboundGroupSession::create(const QByteArray &key)
{
const auto olmInboundGroupSession = olm_inbound_group_session(new uint8_t[olm_inbound_group_session_size()]);
const auto temp = key;
const auto error = olm_init_inbound_group_session(olmInboundGroupSession,
reinterpret_cast<const uint8_t *>(temp.data()), temp.size());
if (error == olm_error()) {
throw lastError(olmInboundGroupSession);
}
return std::make_unique<QOlmInboundGroupSession>(olmInboundGroupSession);
}
std::unique_ptr<QOlmInboundGroupSession> QOlmInboundGroupSession::import(const QByteArray &key)
{
const auto olmInboundGroupSession = olm_inbound_group_session(new uint8_t[olm_inbound_group_session_size()]);
QByteArray keyBuf = key;
const auto error = olm_import_inbound_group_session(olmInboundGroupSession,
reinterpret_cast<const uint8_t *>(keyBuf.data()), keyBuf.size());
if (error == olm_error()) {
throw lastError(olmInboundGroupSession);
}
return std::make_unique<QOlmInboundGroupSession>(olmInboundGroupSession);
}
QByteArray toKey(const PicklingMode &mode)
{
if (std::holds_alternative<Unencrypted>(mode)) {
return "";
}
return std::get<Encrypted>(mode).key;
}
QByteArray QOlmInboundGroupSession::pickle(const PicklingMode &mode) const
{
QByteArray pickledBuf(olm_pickle_inbound_group_session_length(m_groupSession), '0');
const QByteArray key = toKey(mode);
const auto error = olm_pickle_inbound_group_session(m_groupSession, key.data(), key.length(), pickledBuf.data(),
pickledBuf.length());
if (error == olm_error()) {
throw lastError(m_groupSession);
}
return pickledBuf;
}
std::variant<std::unique_ptr<QOlmInboundGroupSession>, QOlmError> QOlmInboundGroupSession::unpickle(QByteArray &pickled, const PicklingMode &mode)
{
QByteArray pickledBuf = pickled;
const auto groupSession = olm_inbound_group_session(new uint8_t[olm_inbound_group_session_size()]);
QByteArray key = toKey(mode);
const auto error = olm_unpickle_inbound_group_session(groupSession, key.data(), key.length(),
pickledBuf.data(), pickledBuf.size());
if (error == olm_error()) {
return lastError(groupSession);
}
key.clear();
return std::make_unique<QOlmInboundGroupSession>(groupSession);
}
std::variant<std::pair<QString, uint32_t>, QOlmError> QOlmInboundGroupSession::decrypt(const QByteArray &message)
{
// This is for capturing the output of olm_group_decrypt
uint32_t messageIndex = 0;
// We need to clone the message because
// olm_decrypt_max_plaintext_length destroys the input buffer
QByteArray messageBuf(message.length(), '0');
std::copy(message.begin(), message.end(), messageBuf.begin());
QByteArray plaintextBuf(olm_group_decrypt_max_plaintext_length(m_groupSession,
reinterpret_cast<uint8_t *>(messageBuf.data()), messageBuf.length()), '0');
messageBuf = QByteArray(message.length(), '0');
std::copy(message.begin(), message.end(), messageBuf.begin());
const auto plaintextLen = olm_group_decrypt(m_groupSession, reinterpret_cast<uint8_t *>(messageBuf.data()),
messageBuf.length(), reinterpret_cast<uint8_t *>(plaintextBuf.data()), plaintextBuf.length(), &messageIndex);
// Error code or plaintext length is returned
const auto decryptError = plaintextLen;
if (decryptError == olm_error()) {
return lastError(m_groupSession);
}
QByteArray output(plaintextLen, '0');
std::memcpy(output.data(), plaintextBuf.data(), plaintextLen);
return std::make_pair<QString, qint32>(QString(output), messageIndex);
}
std::variant<QByteArray, QOlmError> QOlmInboundGroupSession::exportSession(uint32_t messageIndex)
{
const auto keyLength = olm_export_inbound_group_session_length(m_groupSession);
QByteArray keyBuf(keyLength, '0');
const auto error = olm_export_inbound_group_session(m_groupSession, reinterpret_cast<uint8_t *>(keyBuf.data()), keyLength, messageIndex);
if (error == olm_error()) {
return lastError(m_groupSession);
}
return keyBuf;
}
uint32_t QOlmInboundGroupSession::firstKnownIndex() const
{
return olm_inbound_group_session_first_known_index(m_groupSession);
}
QByteArray QOlmInboundGroupSession::sessionId() const
{
QByteArray sessionIdBuf(olm_inbound_group_session_id_length(m_groupSession), '0');
const auto error = olm_inbound_group_session_id(m_groupSession, reinterpret_cast<uint8_t *>(sessionIdBuf.data()),
sessionIdBuf.length());
if (error == olm_error()) {
throw lastError(m_groupSession);
}
return sessionIdBuf;
}
bool QOlmInboundGroupSession::isVerified() const
{
return olm_inbound_group_session_is_verified(m_groupSession) != 0;
}
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