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
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
/*
Algorithm Factory
(C) 2008 Jack Lloyd
*/
#include <botan/algo_factory.h>
#include <botan/stl_util.h>
#include <botan/engine.h>
#include <botan/exceptn.h>
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/hash.h>
#include <botan/mac.h>
#include <algorithm>
namespace Botan {
Algorithm_Factory::Algorithm_Factory(Mutex_Factory& mf) :
mutex_factory(mf),
hash_cache(mf.make())
{
}
/**
* Delete all engines
*/
Algorithm_Factory::~Algorithm_Factory()
{
std::for_each(engines.begin(), engines.end(), del_fun<Engine>());
engines.clear();
}
/**
* Add a new engine to the list
*/
void Algorithm_Factory::add_engine(Engine* engine)
{
engine->initialize(mutex_factory);
engines.insert(engines.begin(), engine);
}
/*************************************************
* Get an engine out of the list *
*************************************************/
Engine* Algorithm_Factory::get_engine_n(u32bit n) const
{
if(n >= engines.size())
return 0;
return engines[n];
}
/**
* Return the possible providers of a request
*/
std::vector<std::string>
Algorithm_Factory::providers_of(const SCAN_Name& request)
{
std::vector<std::string> providers;
for(u32bit i = 0; i != engines.size(); ++i)
{
std::string provider = engines[i]->provider_name();
if(request.provider_allowed(provider))
{
if(engines[i]->prototype_block_cipher(request, *this) ||
engines[i]->prototype_stream_cipher(request, *this) ||
engines[i]->prototype_hash_function(request, *this) ||
engines[i]->prototype_mac(request, *this))
{
providers.push_back(provider);
}
}
}
return providers;
}
/**
* Return the prototypical object cooresponding to this request
*/
const BlockCipher*
Algorithm_Factory::prototype_block_cipher(const SCAN_Name& request)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(request.provider_allowed(engines[i]->provider_name()))
{
const BlockCipher* algo =
engines[i]->prototype_block_cipher(request, *this);
if(algo)
return algo;
}
}
return 0;
}
/**
* Return a new object cooresponding to this request
*/
BlockCipher* Algorithm_Factory::make_block_cipher(const SCAN_Name& request)
{
const BlockCipher* prototype = prototype_block_cipher(request);
if(prototype)
return prototype->clone();
throw Algorithm_Not_Found(request.as_string());
}
/**
* Add a new object
*/
void Algorithm_Factory::add_block_cipher(BlockCipher* hash)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(engines[i]->can_add_algorithms())
{
engines[i]->add_algorithm(hash);
return;
}
}
throw Exception("Algorithm_Factory::add_block_cipher: No engine found");
}
/**
* Return the prototypical object cooresponding to this request
*/
const StreamCipher*
Algorithm_Factory::prototype_stream_cipher(const SCAN_Name& request)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(request.provider_allowed(engines[i]->provider_name()))
{
const StreamCipher* algo =
engines[i]->prototype_stream_cipher(request, *this);
if(algo)
return algo;
}
}
return 0;
}
/**
* Return a new object cooresponding to this request
*/
StreamCipher* Algorithm_Factory::make_stream_cipher(const SCAN_Name& request)
{
const StreamCipher* prototype = prototype_stream_cipher(request);
if(prototype)
return prototype->clone();
throw Algorithm_Not_Found(request.as_string());
}
/**
* Add a new object
*/
void Algorithm_Factory::add_stream_cipher(StreamCipher* hash)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(engines[i]->can_add_algorithms())
{
engines[i]->add_algorithm(hash);
return;
}
}
throw Exception("Algorithm_Factory::add_stream_cipher: No engine found");
}
/**
* Return the prototypical object cooresponding to this request
*/
const HashFunction*
Algorithm_Factory::prototype_hash_function(const SCAN_Name& request)
{
#if 1
for(u32bit i = 0; i != engines.size(); ++i)
{
if(request.provider_allowed(engines[i]->provider_name()))
{
const HashFunction* algo =
engines[i]->prototype_hash_function(request, *this);
if(algo)
return algo;
}
}
return 0;
#else
const HashFunction* cache_hit = hash_cache.get(request);
if(cache_hit)
return cache_hit;
// Search for all providers of this algorithm and add them to the cache
for(u32bit i = 0; i != engines.size(); ++i)
{
const std::string provider = engines[i]->provider_name();
HashFunction* impl = engines[i]->find_hash(request, *this);
if(impl)
hash_cache.add(impl, provider);
}
/* Now try the cache search again (if the providers don't match up
with ones that exist in this build, this might still fail and
return 0).
*/
return hash_cache.get(request);
#endif
}
/**
* Return a new object cooresponding to this request
*/
HashFunction* Algorithm_Factory::make_hash_function(const SCAN_Name& request)
{
const HashFunction* prototype = prototype_hash_function(request);
if(prototype)
return prototype->clone();
throw Algorithm_Not_Found(request.as_string());
}
/**
* Add a new object
*/
void Algorithm_Factory::add_hash_function(HashFunction* hash)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(engines[i]->can_add_algorithms())
{
engines[i]->add_algorithm(hash);
return;
}
}
throw Exception("Algorithm_Factory::add_hash_function: No engine found");
}
/**
* Return the prototypical object cooresponding to this request
*/
const MessageAuthenticationCode*
Algorithm_Factory::prototype_mac(const SCAN_Name& request)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(request.provider_allowed(engines[i]->provider_name()))
{
const MessageAuthenticationCode* algo =
engines[i]->prototype_mac(request, *this);
if(algo)
return algo;
}
}
return 0;
}
/**
* Return a new object cooresponding to this request
*/
MessageAuthenticationCode*
Algorithm_Factory::make_mac(const SCAN_Name& request)
{
const MessageAuthenticationCode* prototype = prototype_mac(request);
if(prototype)
return prototype->clone();
throw Algorithm_Not_Found(request.as_string());
}
/**
* Add a new object
*/
void Algorithm_Factory::add_mac(MessageAuthenticationCode* hash)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(engines[i]->can_add_algorithms())
{
engines[i]->add_algorithm(hash);
return;
}
}
throw Exception("Algorithm_Factory::add_mac: No engine found");
}
}
|
