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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:critical reason:data-parser
#include "qapduutils_p.h"
#include <QtCore/QtEndian>
QT_BEGIN_NAMESPACE
/*
Utilities for handling smart card application protocol data units (APDU).
The structure of APDUs is defined by ISO/IEC 7816-4 Organization, security
and commands for interchange. The summary can be found on Wikipedia:
https://en.wikipedia.org/wiki/Smart_card_application_protocol_data_unit
*/
/*
Parses a response APDU from the raw data.
If the data is too short to contain SW bytes, the returned responses SW
is set to QResponseApdu::Empty.
*/
QResponseApdu::QResponseApdu(const QByteArray &response)
{
const auto view = qToByteArrayViewIgnoringNull(response);
if (view.size() < 2) {
m_status = Empty;
m_data = response;
} else {
const auto dataSize = view.size() - 2;
m_status = qFromBigEndian(qFromUnaligned<uint16_t>(view.data() + dataSize));
m_data = response.left(dataSize);
}
}
/*
Builds a command APDU from components according to ISO/IEC 7816.
*/
QByteArray QCommandApdu::build(uint8_t cla, uint8_t ins, uint8_t p1, uint8_t p2,
QByteArrayView data, uint16_t ne)
{
Q_ASSERT(data.size() <= 0xFFFF);
QByteArray apdu;
apdu.append(static_cast<char>(cla));
apdu.append(static_cast<char>(ins));
apdu.append(static_cast<char>(p1));
apdu.append(static_cast<char>(p2));
bool extendedLc = false;
uint16_t nc = data.size();
if (nc > 0) {
if (nc < 256) {
apdu.append(static_cast<char>(nc));
} else {
extendedLc = true;
apdu.append('\0');
apdu.append(static_cast<char>(nc >> 8));
apdu.append(static_cast<char>(nc & 0xFF));
}
apdu.append(data);
}
if (ne) {
if (ne < 256) {
apdu.append(static_cast<char>(ne));
} else if (ne == 256) {
apdu.append(static_cast<char>('\0'));
} else {
if (!extendedLc)
apdu.append('\0');
apdu.append(static_cast<char>(ne >> 8));
apdu.append(static_cast<char>(ne & 0xFF));
}
}
return apdu;
}
QT_END_NAMESPACE
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