1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// Copyright (C) 2021 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
#include <QtNetwork/private/qssl_p.h>
#include "qtlsbackend_schannel_p.h"
#include "qtlskey_schannel_p.h"
#include "../shared/qwincrypt_p.h"
#include <QtNetwork/private/qtlsbackend_p.h>
#include <QtNetwork/private/qsslkey_p.h>
#include <QtNetwork/qsslkey.h>
#include <QtCore/qscopeguard.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qvarlengtharray.h>
QT_BEGIN_NAMESPACE
namespace {
const wchar_t *getName(QSslKeyPrivate::Cipher cipher)
{
switch (cipher) {
case QTlsPrivate::Cipher::DesCbc:
return BCRYPT_DES_ALGORITHM;
case QTlsPrivate::Cipher::DesEde3Cbc:
return BCRYPT_3DES_ALGORITHM;
case QTlsPrivate::Cipher::Rc2Cbc:
return BCRYPT_RC2_ALGORITHM;
case QTlsPrivate::Cipher::Aes128Cbc:
case QTlsPrivate::Cipher::Aes192Cbc:
case QTlsPrivate::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(lcTlsBackendSchannel, "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(lcTlsBackendSchannel, "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(lcTlsBackendSchannel, "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(lcTlsBackendSchannel, "%s failed (%ld)!", encrypt ? "Encrypt" : "Decrypt",
status);
return {};
}
}
return QByteArray(reinterpret_cast<const char *>(output.constData()), int(sizeNeeded));
}
} // anonymous namespace
namespace QTlsPrivate {
QByteArray TlsKeySchannel::decrypt(Cipher cipher, const QByteArray &data, const QByteArray &key,
const QByteArray &iv) const
{
return doCrypt(cipher, data, key, iv, false);
}
QByteArray TlsKeySchannel::encrypt(Cipher cipher, const QByteArray &data, const QByteArray &key,
const QByteArray &iv) const
{
return doCrypt(cipher, data, key, iv, true);
}
} // namespace QTlsPrivate
QT_END_NAMESPACE
|
