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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
|
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include <precompiled_xmlsecurity.hxx>
#include <osl/time.h>
#include <rtl/random.h>
#include <rtl/ref.hxx>
#include "ciphercontext.hxx"
using namespace ::com::sun::star;
uno::Reference< xml::crypto::XCipherContext > OCipherContext::Create( CK_MECHANISM_TYPE nNSSCipherID, const uno::Sequence< ::sal_Int8 >& aKey, const uno::Sequence< ::sal_Int8 >& aInitializationVector, bool bEncryption, bool bW3CPadding )
{
::rtl::Reference< OCipherContext > xResult = new OCipherContext;
xResult->m_pSlot = PK11_GetBestSlot( nNSSCipherID, NULL );
if ( xResult->m_pSlot )
{
SECItem aKeyItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aKey.getConstArray() ) ), aKey.getLength() };
xResult->m_pSymKey = PK11_ImportSymKey( xResult->m_pSlot, nNSSCipherID, PK11_OriginDerive, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, &aKeyItem, NULL );
if ( xResult->m_pSymKey )
{
SECItem aIVItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aInitializationVector.getConstArray() ) ), aInitializationVector.getLength() };
xResult->m_pSecParam = PK11_ParamFromIV( nNSSCipherID, &aIVItem );
if ( xResult->m_pSecParam )
{
xResult->m_pContext = PK11_CreateContextBySymKey( nNSSCipherID, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, xResult->m_pSymKey, xResult->m_pSecParam);
if ( xResult->m_pContext )
{
xResult->m_bEncryption = bEncryption;
xResult->m_bW3CPadding = bW3CPadding;
xResult->m_bPadding = bW3CPadding || ( PK11_GetPadMechanism( nNSSCipherID ) == nNSSCipherID );
xResult->m_nBlockSize = PK11_GetBlockSize( nNSSCipherID, xResult->m_pSecParam );
if ( xResult->m_nBlockSize <= SAL_MAX_INT8 )
return xResult.get();
}
}
}
}
return uno::Reference< xml::crypto::XCipherContext >();
}
void OCipherContext::Dispose()
{
::osl::MutexGuard aGuard( m_aMutex );
if ( m_pContext )
{
PK11_DestroyContext( m_pContext, PR_TRUE );
m_pContext = NULL;
}
if ( m_pSecParam )
{
SECITEM_FreeItem( m_pSecParam, PR_TRUE );
m_pSecParam = NULL;
}
if ( m_pSymKey )
{
PK11_FreeSymKey( m_pSymKey );
m_pSymKey = NULL;
}
if ( m_pSlot )
{
PK11_FreeSlot( m_pSlot );
m_pSlot = NULL;
}
m_bDisposed = true;
}
uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::convertWithCipherContext( const uno::Sequence< ::sal_Int8 >& aData )
throw ( lang::IllegalArgumentException, lang::DisposedException, uno::RuntimeException)
{
::osl::MutexGuard aGuard( m_aMutex );
if ( m_bBroken )
throw uno::RuntimeException();
if ( m_bDisposed )
throw lang::DisposedException();
uno::Sequence< sal_Int8 > aToConvert;
if ( aData.getLength() )
{
sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
OSL_ENSURE( nOldLastBlockLen <= m_nBlockSize, "Unexpected last block size!" );
sal_Int32 nAvailableData = nOldLastBlockLen + aData.getLength();
sal_Int32 nToConvertLen = nAvailableData;
if ( m_bEncryption || !m_bW3CPadding )
{
if ( nAvailableData % m_nBlockSize == 0 )
nToConvertLen = nAvailableData;
else if ( nAvailableData < m_nBlockSize )
nToConvertLen = 0;
else
nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize;
}
else
{
// decryption with W3C padding needs at least one block for finalizing
if ( nAvailableData < m_nBlockSize * 2 )
nToConvertLen = 0;
else
nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize - m_nBlockSize;
}
aToConvert.realloc( nToConvertLen );
if ( nToConvertLen == 0 )
{
m_aLastBlock.realloc( nOldLastBlockLen + aData.getLength() );
rtl_copyMemory( m_aLastBlock.getArray() + nOldLastBlockLen, aData.getConstArray(), aData.getLength() );
// aToConvert stays empty
}
else if ( nToConvertLen < nOldLastBlockLen )
{
rtl_copyMemory( aToConvert.getArray(), m_aLastBlock.getConstArray(), nToConvertLen );
rtl_copyMemory( m_aLastBlock.getArray(), m_aLastBlock.getConstArray() + nToConvertLen, nOldLastBlockLen - nToConvertLen );
m_aLastBlock.realloc( nOldLastBlockLen - nToConvertLen + aData.getLength() );
rtl_copyMemory( m_aLastBlock.getArray() + nOldLastBlockLen - nToConvertLen, aData.getConstArray(), aData.getLength() );
}
else
{
rtl_copyMemory( aToConvert.getArray(), m_aLastBlock.getConstArray(), nOldLastBlockLen );
if ( nToConvertLen > nOldLastBlockLen )
rtl_copyMemory( aToConvert.getArray() + nOldLastBlockLen, aData.getConstArray(), nToConvertLen - nOldLastBlockLen );
m_aLastBlock.realloc( nAvailableData - nToConvertLen );
rtl_copyMemory( m_aLastBlock.getArray(), aData.getConstArray() + nToConvertLen - nOldLastBlockLen, nAvailableData - nToConvertLen );
}
}
uno::Sequence< sal_Int8 > aResult;
OSL_ENSURE( aToConvert.getLength() % m_nBlockSize == 0, "Unexpected size of the data to encrypt!" );
if ( aToConvert.getLength() )
{
int nResultLen = 0;
aResult.realloc( aToConvert.getLength() + m_nBlockSize );
if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nResultLen, aResult.getLength(), const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aToConvert.getConstArray() ) ), aToConvert.getLength() ) != SECSuccess )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
m_nConverted += aToConvert.getLength();
aResult.realloc( nResultLen );
}
return aResult;
}
uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::finalizeCipherContextAndDispose()
throw (lang::DisposedException, uno::RuntimeException)
{
::osl::MutexGuard aGuard( m_aMutex );
if ( m_bBroken )
throw uno::RuntimeException();
if ( m_bDisposed )
throw lang::DisposedException();
OSL_ENSURE( m_nBlockSize <= SAL_MAX_INT8, "Unexpected block size!" );
OSL_ENSURE( m_nConverted % m_nBlockSize == 0, "Unexpected amount of bytes is already converted!" );
sal_Int32 nSizeForPadding = ( m_nConverted + m_aLastBlock.getLength() ) % m_nBlockSize;
// if it is decryption, the amount of data should be rounded to the block size even in case of padding
if ( ( !m_bPadding || !m_bEncryption ) && nSizeForPadding )
throw uno::RuntimeException( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "The data should contain complete blocks only." ) ), uno::Reference< uno::XInterface >() );
if ( m_bW3CPadding && m_bEncryption )
{
// in this case the last block should be smaller than standtard block
// it will be increased with the padding
OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize, "Unexpected size of cashed incomplete last block!" );
// W3CPadding handling for encryption
sal_Int32 nPaddingSize = m_nBlockSize - nSizeForPadding;
sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
m_aLastBlock.realloc( nOldLastBlockLen + nPaddingSize );
if ( nPaddingSize > 1 )
{
TimeValue aTime;
osl_getSystemTime( &aTime );
rtlRandomPool aRandomPool = rtl_random_createPool();
rtl_random_addBytes( aRandomPool, &aTime, 8 );
rtl_random_getBytes( aRandomPool, m_aLastBlock.getArray() + nOldLastBlockLen, nPaddingSize - 1 );
rtl_random_destroyPool ( aRandomPool );
}
m_aLastBlock[m_aLastBlock.getLength() - 1] = static_cast< sal_Int8 >( nPaddingSize );
}
// finally should the last block be smaller than two standard blocks
OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize * 2 , "Unexpected size of cashed incomplete last block!" );
uno::Sequence< sal_Int8 > aResult;
if ( m_aLastBlock.getLength() )
{
int nPrefResLen = 0;
aResult.realloc( m_aLastBlock.getLength() + m_nBlockSize );
if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nPrefResLen, aResult.getLength(), const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( m_aLastBlock.getConstArray() ) ), m_aLastBlock.getLength() ) != SECSuccess )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
aResult.realloc( nPrefResLen );
m_aLastBlock.realloc( 0 );
}
sal_Int32 nPrefixLen = aResult.getLength();
aResult.realloc( nPrefixLen + m_nBlockSize * 2 );
unsigned nFinalLen = 0;
if ( PK11_DigestFinal( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() + nPrefixLen ), &nFinalLen, aResult.getLength() - nPrefixLen ) != SECSuccess )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
aResult.realloc( nPrefixLen + nFinalLen );
if ( m_bW3CPadding && !m_bEncryption )
{
// W3CPadding handling for decryption
// aResult should have anough data, since we let m_aLastBlock be big enough in case of decryption
OSL_ENSURE( aResult.getLength() >= m_nBlockSize, "Not enough data to handle the padding!" );
sal_Int8 nBytesToRemove = aResult[aResult.getLength() - 1];
if ( nBytesToRemove <= 0 || nBytesToRemove > aResult.getLength() )
{
m_bBroken = true;
Dispose();
throw uno::RuntimeException();
}
aResult.realloc( aResult.getLength() - nBytesToRemove );
}
Dispose();
return aResult;
}
|
