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
|
/*
* Codec class for SQLite3 encryption codec.
* (C) 2010 Olivier de Gaalon
*
* Distributed under the terms of the Botan license
*/
#include "codec.h"
#include <botan/init.h>
Codec::Codec(void *db)
{
InitializeCodec(db);
}
Codec::Codec(const Codec *other, void *db)
{
//Only used to copy main db key for an attached db
InitializeCodec(db);
m_hasReadKey = other->m_hasReadKey;
m_hasWriteKey = other->m_hasWriteKey;
m_readKey = other->m_readKey;
m_ivReadKey = other->m_ivReadKey;
m_writeKey = other->m_writeKey;
m_ivWriteKey = other->m_ivWriteKey;
}
void Codec::InitializeCodec(void *db)
{
m_hasReadKey = false;
m_hasWriteKey = false;
m_db = db;
try
{
m_encipherFilter = get_cipher(BLOCK_CIPHER_STR, ENCRYPTION);
m_decipherFilter = get_cipher(BLOCK_CIPHER_STR, DECRYPTION);
m_cmac = new MAC_Filter(MAC_STR);
m_encipherPipe.append(m_encipherFilter);
m_decipherPipe.append(m_decipherFilter);
m_macPipe.append(m_cmac);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
}
void Codec::GenerateWriteKey(const char *userPassword, int passwordLength)
{
try
{
#if BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,9,4)
PBKDF *pbkdf = get_pbkdf(PBKDF_STR);
SymmetricKey masterKey =
pbkdf->derive_key(KEY_SIZE + IV_DERIVATION_KEY_SIZE, std::string(userPassword, passwordLength),
(const byte*)SALT_STR.c_str(), SALT_SIZE, PBKDF_ITERATIONS);
#elif BOTAN_VERSION_CODE >= BOTAN_VERSION_CODE_FOR(1,8,0)
S2K* s2k = get_s2k(PBKDF_STR);
s2k->set_iterations(PBKDF_ITERATIONS);
s2k->change_salt((const byte*)SALT_STR.c_str(), SALT_SIZE);
SymmetricKey masterKey =
s2k->derive_key(KEY_SIZE + IV_DERIVATION_KEY_SIZE, std::string(userPassword, passwordLength));
#else
#error "This code requires botan 1.8 or newer"
#endif
m_writeKey = SymmetricKey(masterKey.bits_of(), KEY_SIZE);
m_ivWriteKey = SymmetricKey(masterKey.bits_of() + KEY_SIZE, IV_DERIVATION_KEY_SIZE);
m_hasWriteKey = true;
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
}
void Codec::DropWriteKey()
{
m_hasWriteKey = false;
}
void Codec::SetReadIsWrite()
{
m_readKey = m_writeKey;
m_ivReadKey = m_ivWriteKey;
m_hasReadKey = m_hasWriteKey;
}
void Codec::SetWriteIsRead()
{
m_writeKey = m_readKey;
m_ivWriteKey = m_ivReadKey;
m_hasWriteKey = m_hasReadKey;
}
unsigned char* Codec::Encrypt(int page, unsigned char *data, bool useWriteKey)
{
memcpy(m_page, data, m_pageSize);
try
{
m_encipherFilter->set_key(useWriteKey ? m_writeKey : m_readKey);
m_encipherFilter->set_iv(GetIVForPage(page, useWriteKey));
m_encipherPipe.process_msg(m_page, m_pageSize);
m_encipherPipe.read(m_page, m_encipherPipe.remaining(Pipe::LAST_MESSAGE), Pipe::LAST_MESSAGE);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
return m_page; //return location of newly ciphered data
}
void Codec::Decrypt(int page, unsigned char *data)
{
try
{
m_decipherFilter->set_key(m_readKey);
m_decipherFilter->set_iv(GetIVForPage(page, false));
m_decipherPipe.process_msg(data, m_pageSize);
m_decipherPipe.read(data, m_decipherPipe.remaining(Pipe::LAST_MESSAGE), Pipe::LAST_MESSAGE);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
}
InitializationVector Codec::GetIVForPage(u32bit page, bool useWriteKey)
{
try
{
static unsigned char *intiv[4];
store_le(page, (byte*)intiv);
m_cmac->set_key(useWriteKey ? m_ivWriteKey : m_ivReadKey);
m_macPipe.process_msg((byte*)intiv, 4);
return m_macPipe.read_all(Pipe::LAST_MESSAGE);
}
catch(Botan::Exception e)
{
m_botanErrorMsg = e.what();
}
}
const char* Codec::GetAndResetError()
{
const char *message = m_botanErrorMsg;
m_botanErrorMsg = 0;
return message;
}
#include "codec_c_interface.h"
void InitializeBotan() {
LibraryInitializer::initialize();
}
void* InitializeNewCodec(void *db) {
return new Codec(db);
}
void* InitializeFromOtherCodec(const void *otherCodec, void *db) {
return new Codec((Codec*)otherCodec, db);
}
void GenerateWriteKey(void *codec, const char *userPassword, int passwordLength) {
((Codec*)codec)->GenerateWriteKey(userPassword, passwordLength);
}
void DropWriteKey(void *codec) {
((Codec*)codec)->DropWriteKey();
}
void SetWriteIsRead(void *codec) {
((Codec*)codec)->SetWriteIsRead();
}
void SetReadIsWrite(void *codec) {
((Codec*)codec)->SetReadIsWrite();
}
unsigned char* Encrypt(void *codec, int page, unsigned char *data, Bool useWriteKey) {
return ((Codec*)codec)->Encrypt(page, data, useWriteKey);
}
void Decrypt(void *codec, int page, unsigned char *data) {
((Codec*)codec)->Decrypt(page, data);
}
void SetPageSize(void *codec, int pageSize) {
((Codec*)codec)->SetPageSize(pageSize);
}
Bool HasReadKey(void *codec) {
return ((Codec*)codec)->HasReadKey();
}
Bool HasWriteKey(void *codec) {
return ((Codec*)codec)->HasWriteKey();
}
void* GetDB(void *codec) {
return ((Codec*)codec)->GetDB();
}
const char* GetAndResetError(void *codec)
{
return ((Codec*)codec)->GetAndResetError();
}
void DeleteCodec(void *codec) {
Codec *deleteThisCodec = (Codec*)codec;
delete deleteThisCodec;
}
|
