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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
#include <oox/crypto/CryptTools.hxx>
#include <filter/msfilter/mscodec.hxx>
#include <com/sun/star/uno/RuntimeException.hpp>
namespace oox {
namespace core {
Crypto::Crypto()
#if USE_TLS_NSS
: mContext(nullptr)
, mSecParam(nullptr)
, mSymKey(nullptr)
#endif
{
#if USE_TLS_NSS
// Initialize NSS, database functions are not needed
NSS_NoDB_Init(nullptr);
#endif // USE_TLS_NSS
}
Crypto::~Crypto()
{
#if USE_TLS_OPENSSL
EVP_CIPHER_CTX_cleanup( &mContext );
#endif
#if USE_TLS_NSS
if (mContext)
PK11_DestroyContext(mContext, PR_TRUE);
if (mSymKey)
PK11_FreeSymKey(mSymKey);
if (mSecParam)
SECITEM_FreeItem(mSecParam, PR_TRUE);
#endif
}
#if USE_TLS_OPENSSL
const EVP_CIPHER* Crypto::getCipher(CryptoType type)
{
switch(type)
{
case AES_128_ECB:
return EVP_aes_128_ecb();
case AES_128_CBC:
return EVP_aes_128_cbc();
case AES_256_CBC:
return EVP_aes_256_cbc();
default:
break;
}
return NULL;
}
#endif
#if USE_TLS_NSS
void Crypto::setupContext(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, CryptoType type, CK_ATTRIBUTE_TYPE operation)
{
CK_MECHANISM_TYPE mechanism = static_cast<CK_ULONG>(-1);
SECItem ivItem;
ivItem.type = siBuffer;
if(iv.empty())
ivItem.data = nullptr;
else
ivItem.data = iv.data();
ivItem.len = iv.size();
SECItem* pIvItem = nullptr;
switch(type)
{
case AES_128_ECB:
mechanism = CKM_AES_ECB;
break;
case AES_128_CBC:
mechanism = CKM_AES_CBC;
pIvItem = &ivItem;
break;
case AES_256_CBC:
mechanism = CKM_AES_CBC;
pIvItem = &ivItem;
break;
default:
break;
}
PK11SlotInfo* pSlot(PK11_GetBestSlot(mechanism, nullptr));
if (!pSlot)
throw css::uno::RuntimeException("NSS Slot failure", css::uno::Reference<css::uno::XInterface>());
SECItem keyItem;
keyItem.type = siBuffer;
keyItem.data = key.data();
keyItem.len = key.size();
mSymKey = PK11_ImportSymKey(pSlot, mechanism, PK11_OriginUnwrap, CKA_ENCRYPT, &keyItem, nullptr);
if (!mSymKey)
throw css::uno::RuntimeException("NSS SymKey failure", css::uno::Reference<css::uno::XInterface>());
mSecParam = PK11_ParamFromIV(mechanism, pIvItem);
mContext = PK11_CreateContextBySymKey(mechanism, operation, mSymKey, mSecParam);
}
#endif // USE_TLS_NSS
// DECRYPT
Decrypt::Decrypt(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, CryptoType type)
: Crypto()
{
#if USE_TLS_OPENSSL + USE_TLS_NSS == 0
(void)key;
(void)iv;
(void)type;
#endif
#if USE_TLS_OPENSSL
EVP_CIPHER_CTX_init(&mContext);
const EVP_CIPHER* cipher = getCipher(type);
const size_t nMinKeySize = EVP_CIPHER_key_length(cipher);
if (key.size() < nMinKeySize)
key.resize(nMinKeySize, 0);
if (iv.empty())
EVP_DecryptInit_ex(&mContext, cipher, nullptr, key.data(), 0);
else
{
const size_t nMinIVSize = EVP_CIPHER_iv_length(cipher);
if (iv.size() < nMinIVSize)
iv.resize(nMinIVSize, 0);
EVP_DecryptInit_ex(&mContext, cipher, nullptr, key.data(), iv.data());
}
EVP_CIPHER_CTX_set_padding(&mContext, 0);
#endif
#if USE_TLS_NSS
setupContext(key, iv, type, CKA_DECRYPT);
#endif // USE_TLS_NSS
}
sal_uInt32 Decrypt::update(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input, sal_uInt32 inputLength)
{
int outputLength = 0;
#if USE_TLS_OPENSSL + USE_TLS_NSS > 0
sal_uInt32 actualInputLength = inputLength == 0 || inputLength > input.size() ? input.size() : inputLength;
#else
(void)output;
(void)input;
(void)inputLength;
#endif
#if USE_TLS_OPENSSL
(void)EVP_DecryptUpdate(&mContext, output.data(), &outputLength, input.data(), actualInputLength);
#endif // USE_TLS_OPENSSL
#if USE_TLS_NSS
(void)PK11_CipherOp( mContext, output.data(), &outputLength, actualInputLength, input.data(), actualInputLength );
#endif // USE_TLS_NSS
return static_cast<sal_uInt32>(outputLength);
}
sal_uInt32 Decrypt::aes128ecb(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input, std::vector<sal_uInt8>& key)
{
sal_uInt32 outputLength = 0;
std::vector<sal_uInt8> iv;
Decrypt crypto(key, iv, Crypto::AES_128_ECB);
outputLength = crypto.update(output, input);
return outputLength;
}
// ENCRYPT
Encrypt::Encrypt(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, CryptoType type)
: Crypto()
{
#if USE_TLS_OPENSSL + USE_TLS_NSS == 0
(void)key;
(void)iv;
(void)type;
#endif
#if USE_TLS_OPENSSL
EVP_CIPHER_CTX_init(&mContext);
const EVP_CIPHER* cipher = getCipher(type);
if (iv.empty())
EVP_EncryptInit_ex(&mContext, cipher, nullptr, key.data(), 0);
else
EVP_EncryptInit_ex(&mContext, cipher, nullptr, key.data(), iv.data());
EVP_CIPHER_CTX_set_padding(&mContext, 0);
#endif
#if USE_TLS_NSS
setupContext(key, iv, type, CKA_ENCRYPT);
#endif // USE_TLS_NSS
}
sal_uInt32 Encrypt::update(std::vector<sal_uInt8>& output, std::vector<sal_uInt8>& input, sal_uInt32 inputLength)
{
int outputLength = 0;
#if USE_TLS_OPENSSL + USE_TLS_NSS > 0
sal_uInt32 actualInputLength = inputLength == 0 || inputLength > input.size() ? input.size() : inputLength;
#else
(void)output;
(void)input;
(void)inputLength;
#endif
#if USE_TLS_OPENSSL
(void)EVP_EncryptUpdate(&mContext, output.data(), &outputLength, input.data(), actualInputLength);
#endif // USE_TLS_OPENSSL
#if USE_TLS_NSS
(void)PK11_CipherOp(mContext, output.data(), &outputLength, actualInputLength, input.data(), actualInputLength);
#endif // USE_TLS_NSS
return static_cast<sal_uInt32>(outputLength);
}
} // namespace core
} // namespace oox
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
