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
|
/*
* Global PRNG
* (C) 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/libstate.h>
#include <botan/internal/mutex.h>
#if defined(BOTAN_HAS_RANDPOOL)
#include <botan/randpool.h>
#endif
#if defined(BOTAN_HAS_HMAC_RNG)
#include <botan/hmac_rng.h>
#endif
#if defined(BOTAN_HAS_X931_RNG)
#include <botan/x931_rng.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
#include <botan/internal/hres_timer.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM)
#include <botan/internal/dev_random.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
#include <botan/internal/es_egd.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX)
#include <botan/internal/es_unix.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
#include <botan/internal/es_beos.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
#include <botan/internal/es_capi.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
#include <botan/internal/es_win32.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_FTW)
#include <botan/internal/es_ftw.h>
#endif
namespace Botan {
namespace {
/**
* Add any known entropy sources to this RNG
*/
void add_entropy_sources(RandomNumberGenerator* rng)
{
#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
rng->add_entropy_source(new High_Resolution_Timestamp);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM)
rng->add_entropy_source(
new Device_EntropySource(
split_on("/dev/urandom:/dev/random:/dev/srandom", ':')
)
);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
rng->add_entropy_source(
new EGD_EntropySource(split_on("/var/run/egd-pool:/dev/egd-pool", ':'))
);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
rng->add_entropy_source(new Win32_CAPI_EntropySource);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_FTW)
rng->add_entropy_source(new FTW_EntropySource("/proc"));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
rng->add_entropy_source(new Win32_EntropySource);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
rng->add_entropy_source(new BeOS_EntropySource);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX)
rng->add_entropy_source(
new Unix_EntropySource(split_on("/bin:/sbin:/usr/bin:/usr/sbin", ':'))
);
#endif
}
class Serialized_PRNG : public RandomNumberGenerator
{
public:
void randomize(byte out[], size_t len)
{
Mutex_Holder lock(mutex);
rng->randomize(out, len);
}
bool is_seeded() const
{
Mutex_Holder lock(mutex);
return rng->is_seeded();
}
void clear()
{
Mutex_Holder lock(mutex);
rng->clear();
}
std::string name() const
{
Mutex_Holder lock(mutex);
return rng->name();
}
void reseed(size_t poll_bits)
{
Mutex_Holder lock(mutex);
rng->reseed(poll_bits);
}
void add_entropy_source(EntropySource* es)
{
Mutex_Holder lock(mutex);
rng->add_entropy_source(es);
}
void add_entropy(const byte in[], size_t len)
{
Mutex_Holder lock(mutex);
rng->add_entropy(in, len);
}
// We do not own the mutex; Library_State does
Serialized_PRNG(RandomNumberGenerator* r, Mutex* m) :
mutex(m), rng(r) {}
~Serialized_PRNG() { delete rng; }
private:
Mutex* mutex;
RandomNumberGenerator* rng;
};
}
RandomNumberGenerator* Library_State::make_global_rng(Algorithm_Factory& af,
Mutex* mutex)
{
RandomNumberGenerator* rng = 0;
#if defined(BOTAN_HAS_HMAC_RNG)
rng = new HMAC_RNG(af.make_mac("HMAC(SHA-512)"),
af.make_mac("HMAC(SHA-256)"));
#elif defined(BOTAN_HAS_RANDPOOL)
rng = new Randpool(af.make_block_cipher("AES-256"),
af.make_mac("HMAC(SHA-256)"));
#endif
if(!rng)
throw Internal_Error("No usable RNG found enabled in build");
/* If X9.31 is available, use it to wrap the other RNG as a failsafe */
#if defined(BOTAN_HAS_X931_RNG)
rng = new ANSI_X931_RNG(af.make_block_cipher("AES-256"), rng);
#endif
add_entropy_sources(rng);
rng->reseed(256);
return new Serialized_PRNG(rng, mutex);
}
}
|
