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/******************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtKnx module.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
******************************************************************************/
#include "qknxssl_p.h"
#include <private/qtnetworkglobal_p.h>
#if QT_CONFIG(opensslv11)
# include "private/qsslsocket_openssl_symbols_p.h"
# include "private/qsslsocket_openssl11_symbols_p.h"
#endif
#include <QtCore/qmutex.h>
QT_BEGIN_NAMESPACE
class QKnxOpenSsl
{
public:
static bool supportsSsl();
static long sslLibraryVersionNumber();
protected:
static bool ensureLibraryLoaded();
private:
static bool s_libraryLoaded;
static bool s_libraryEnabled;
};
bool QKnxOpenSsl::s_libraryLoaded = false;
bool QKnxOpenSsl::s_libraryEnabled = false;
Q_GLOBAL_STATIC(QKnxOpenSsl, qt_QKnxOpenSsl)
Q_GLOBAL_STATIC_WITH_ARGS(QMutex, qt_knxOpenSslInitMutex, (QMutex::Recursive))
/*!
\internal
*/
bool QKnxOpenSsl::supportsSsl()
{
#if QT_CONFIG(opensslv11)
if (!QKnxPrivate::q_resolveOpenSslSymbols())
return false;
const QMutexLocker locker(qt_knxOpenSslInitMutex);
if (!s_libraryLoaded) {
s_libraryLoaded = true;
// Initialize OpenSSL.
if (QKnxPrivate::q_OPENSSL_init_ssl(0, nullptr) != 1)
return false;
QKnxPrivate::q_SSL_load_error_strings();
QKnxPrivate::q_OpenSSL_add_all_algorithms();
// Initialize OpenSSL's random seed.
if (!QKnxPrivate::q_RAND_status()) {
qWarning("Random number generator not seeded, disabling SSL support");
return false;
}
if (QKnxPrivate::q_EVP_PKEY_type(NID_X25519) == NID_undef) {
qWarning("The X25519 algorithm is not supported, disabling SSL support");
return false;
}
s_libraryEnabled = true;
}
return s_libraryEnabled;
#else
Q_UNUSED(qt_knxOpenSslInitMutex)
return false;
#endif
}
/*!
\internal
*/
long QKnxOpenSsl::sslLibraryVersionNumber()
{
#if QT_CONFIG(opensslv11)
if (supportsSsl())
return QKnxPrivate::q_OpenSSL_version_num();
#endif
return 0;
}
/*!
\internal
*/
bool QKnxSsl::supportsCryptography()
{
return qt_QKnxOpenSsl->supportsSsl();
}
/*!
\internal
*/
long QKnxSsl::sslLibraryVersionNumber()
{
return qt_QKnxOpenSsl->sslLibraryVersionNumber();
}
/*!
\internal
*/
QKnxByteArray QKnxSsl::doCrypt(const QKnxByteArray &key, const QKnxByteArray &iv,
const QKnxByteArray &data, Mode mode)
{
#if QT_CONFIG(opensslv11)
if (!qt_QKnxOpenSsl->supportsSsl())
return {};
QSharedPointer<EVP_CIPHER_CTX> ctxPtr(QKnxPrivate::q_EVP_CIPHER_CTX_new(),
QKnxPrivate::q_EVP_CIPHER_CTX_free);
if (ctxPtr.isNull())
return {};
QKnxPrivate::q_EVP_CIPHER_CTX_reset(ctxPtr.data());
const auto ctx = ctxPtr.data();
const auto c = QKnxPrivate::q_EVP_aes_128_cbc();
if (QKnxPrivate::q_EVP_CipherInit_ex(ctx, c, nullptr, nullptr, nullptr, mode) <= 0)
return {};
if (QKnxPrivate::q_EVP_CIPHER_CTX_set_padding(ctx, 0) <= 0)
return {};
Q_ASSERT(QKnxPrivate::q_EVP_CIPHER_CTX_iv_length(ctx) == 16);
Q_ASSERT(QKnxPrivate::q_EVP_CIPHER_CTX_key_length(ctx) == 16);
if (QKnxPrivate::q_EVP_CipherInit_ex(ctx, nullptr, nullptr, key.constData(), iv.constData(), mode) <= 0)
return {};
int outl, offset = 0;
QKnxByteArray out(data.size() + QKnxPrivate::q_EVP_CIPHER_block_size(c), 0x00);
if (QKnxPrivate::q_EVP_CipherUpdate(ctx, out.data(), &outl, data.constData(), data.size()) <= 0)
return {};
offset += outl;
if (QKnxPrivate::q_EVP_CipherFinal_ex(ctx, out.data() + offset, &outl) <= 0)
return {};
offset += outl;
return out.left(offset);
#else
Q_UNUSED(key)
Q_UNUSED(iv)
Q_UNUSED(data)
Q_UNUSED(mode)
return {};
#endif
}
QT_END_NAMESPACE
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