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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// Copyright (C) 2018 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QMutex>
#include "global.h"
#include "cryptography.h"
#if defined(Q_OS_UNIX)
# include <QFile>
#elif defined(Q_OS_WIN)
// all this mess is needed to get RtlGenRandom()
# include "windows.h"
# define SystemFunction036 NTAPI SystemFunction036
# include "ntsecapi.h"
# undef SystemFunction036
#endif
#if defined(Q_OS_MACOS)
# include <QtCore/private/qcore_mac_p.h>
# include <Security/SecBase.h>
# include <Availability.h>
#endif
#if defined(QT_AM_USE_LIBCRYPTO)
# include "libcryptofunction.h"
QT_BEGIN_NAMESPACE_AM
Q_GLOBAL_STATIC(QMutex, initMutex)
static bool openSslInitialized = false;
static bool loadOpenSsl3LegacyProvider = false;
// clazy:excludeall=non-pod-global-static
// AXIVION DISABLE Qt-NonPodGlobalStatic
static QT_AM_LIBCRYPTO_FUNCTION(ERR_error_string_n, void(*)(unsigned long, char *, size_t));
QT_END_NAMESPACE_AM
#endif
using namespace Qt::StringLiterals;
QT_BEGIN_NAMESPACE_AM
QByteArray Cryptography::generateRandomBytes(int size)
{
QByteArray result;
if (size > 0) {
#if defined(Q_OS_UNIX)
QFile f(u"/dev/urandom"_s);
if (f.open(QIODevice::ReadOnly)) {
result = f.read(size);
if (result.size() != size)
result.clear();
}
#elif defined(Q_OS_WIN)
result.resize(size);
if (!RtlGenRandom(result.data(), size))
result.clear();
#endif
}
return result;
}
void Cryptography::initialize()
{
#if defined(QT_AM_USE_LIBCRYPTO)
QMutexLocker locker(initMutex());
if (!openSslInitialized) {
if (!LibCryptoFunctionBase::initialize(loadOpenSsl3LegacyProvider))
qFatal("Could not load libcrypto");
openSslInitialized = true;
}
#endif
}
void Cryptography::enableOpenSsl3LegacyProvider()
{
#if defined(QT_AM_USE_LIBCRYPTO)
QMutexLocker locker(initMutex());
if (openSslInitialized)
qCritical("Cryptography::enableOpenSsl3LegacyProvider() needs to be called before using any other crypto functions.");
else
loadOpenSsl3LegacyProvider = true;
#endif
}
QString Cryptography::errorString(qint64 osCryptoError, const char *errorDescription)
{
QString result;
if (errorDescription && *errorDescription) {
result = QString::fromLatin1(errorDescription);
result.append(u": "_s);
}
#if defined(QT_AM_USE_LIBCRYPTO)
if (osCryptoError) {
char msg[512];
msg[sizeof(msg) - 1] = 0;
//void ERR_error_string_n(unsigned long e, char *buf, size_t len);
am_ERR_error_string_n(static_cast<unsigned long>(osCryptoError), msg, sizeof(msg) - 1);
result.append(QString::fromLocal8Bit(msg));
}
#elif defined(Q_OS_WIN)
if (osCryptoError) {
LPWSTR msg = nullptr;
FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, osCryptoError, 0, (LPWSTR) &msg, 0, nullptr);
// remove potential \r\n at the end
result.append(QString::fromWCharArray(msg).trimmed());
HeapFree(GetProcessHeap(), 0, msg);
}
#elif defined(Q_OS_MACOS)
if (osCryptoError) {
# if QT_MACOS_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(100300, 110300)
if (__builtin_available(macOS 10.3, iOS 12.3, *)) {
QCFType<CFStringRef> msg = SecCopyErrorMessageString(qint32(osCryptoError), nullptr);
result.append(QString::fromCFString(msg));
}
# else
result.append(QString::number(osCryptoError));
# endif
}
#else
Q_UNUSED(osCryptoError)
#endif
return result;
}
QT_END_NAMESPACE_AM
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