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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or 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.GPL2 and 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qssl_p.h"
#include "qsslkey.h"
#include "qsslkey_p.h"
#include "qsslcertificate_p.h"
#include <QtCore/qbytearray.h>
#include <QtCore/qscopeguard.h>
QT_BEGIN_NAMESPACE
namespace {
const wchar_t *getName(QSslKeyPrivate::Cipher cipher)
{
switch (cipher) {
case QSslKeyPrivate::Cipher::DesCbc:
return BCRYPT_DES_ALGORITHM;
case QSslKeyPrivate::Cipher::DesEde3Cbc:
return BCRYPT_3DES_ALGORITHM;
case QSslKeyPrivate::Cipher::Rc2Cbc:
return BCRYPT_RC2_ALGORITHM;
case QSslKeyPrivate::Cipher::Aes128Cbc:
case QSslKeyPrivate::Cipher::Aes192Cbc:
case QSslKeyPrivate::Cipher::Aes256Cbc:
return BCRYPT_AES_ALGORITHM;
}
Q_UNREACHABLE();
}
BCRYPT_ALG_HANDLE getHandle(QSslKeyPrivate::Cipher cipher)
{
BCRYPT_ALG_HANDLE handle;
NTSTATUS status = BCryptOpenAlgorithmProvider(
&handle, // phAlgorithm
getName(cipher), // pszAlgId
nullptr, // pszImplementation
0 // dwFlags
);
if (status < 0) {
qCWarning(lcSsl, "Failed to open algorithm handle (%ld)!", status);
return nullptr;
}
return handle;
}
BCRYPT_KEY_HANDLE generateSymmetricKey(BCRYPT_ALG_HANDLE handle,
const QByteArray &key)
{
BCRYPT_KEY_HANDLE keyHandle;
NTSTATUS status = BCryptGenerateSymmetricKey(
handle, // hAlgorithm
&keyHandle, // phKey
nullptr, // pbKeyObject (can ignore)
0, // cbKeyObject (also ignoring)
reinterpret_cast<unsigned char *>(const_cast<char *>(key.data())), // pbSecret
ULONG(key.length()), // cbSecret
0 // dwFlags
);
if (status < 0) {
qCWarning(lcSsl, "Failed to generate symmetric key (%ld)!", status);
return nullptr;
}
status = BCryptSetProperty(
keyHandle, // hObject
BCRYPT_CHAINING_MODE, // pszProperty
reinterpret_cast<UCHAR *>(const_cast<wchar_t *>(BCRYPT_CHAIN_MODE_CBC)), // pbInput
ARRAYSIZE(BCRYPT_CHAIN_MODE_CBC), // cbInput
0 // dwFlags
);
if (status < 0) {
BCryptDestroyKey(keyHandle);
qCWarning(lcSsl, "Failed to change the symmetric key's chaining mode (%ld)!", status);
return nullptr;
}
return keyHandle;
}
QByteArray doCrypt(QSslKeyPrivate::Cipher cipher, const QByteArray &data, const QByteArray &key,
const QByteArray &iv, bool encrypt)
{
BCRYPT_ALG_HANDLE handle = getHandle(cipher);
if (!handle)
return {};
auto handleDealloc = qScopeGuard([&handle]() {
BCryptCloseAlgorithmProvider(handle, 0);
});
BCRYPT_KEY_HANDLE keyHandle = generateSymmetricKey(handle, key);
if (!keyHandle)
return {};
auto keyHandleDealloc = qScopeGuard([&keyHandle]() {
BCryptDestroyKey(keyHandle);
});
QByteArray ivCopy = iv; // This gets modified, so we take a copy
ULONG sizeNeeded = 0;
QVarLengthArray<unsigned char> output;
auto cryptFunction = encrypt ? BCryptEncrypt : BCryptDecrypt;
for (int i = 0; i < 2; i++) {
output.resize(int(sizeNeeded));
auto input = reinterpret_cast<unsigned char *>(const_cast<char *>(data.data()));
// Need to call it twice because the first iteration lets us know the size needed.
NTSTATUS status = cryptFunction(
keyHandle, // hKey
input, // pbInput
ULONG(data.length()), // cbInput
nullptr, // pPaddingInfo
reinterpret_cast<unsigned char *>(ivCopy.data()), // pbIV
ULONG(ivCopy.length()), // cbIV
sizeNeeded ? output.data() : nullptr, // pbOutput
ULONG(output.length()), // cbOutput
&sizeNeeded, // pcbResult
BCRYPT_BLOCK_PADDING // dwFlags
);
if (status < 0) {
qCWarning(lcSsl, "%s failed (%ld)!", encrypt ? "Encrypt" : "Decrypt", status);
return {};
}
}
return QByteArray(reinterpret_cast<const char *>(output.constData()), int(sizeNeeded));
}
} // anonymous namespace
QByteArray QSslKeyPrivate::decrypt(Cipher cipher, const QByteArray &data, const QByteArray &key,
const QByteArray &iv)
{
return doCrypt(cipher, data, key, iv, false);
}
QByteArray QSslKeyPrivate::encrypt(Cipher cipher, const QByteArray &data, const QByteArray &key,
const QByteArray &iv)
{
return doCrypt(cipher, data, key, iv, true);
}
QT_END_NAMESPACE
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