13190843806

Committed 07 Feb 2025 12:50AM UTC coverage: 91.233% (+0.006%) from 91.227%

Build # 13190843806

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Merge pull request #4639 from randombit/jack/cleanup-build-h

Remove most toggles from build.h

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96.72

/src/lib/entropy/entropy_srcs.cpp

/*
* Entropy Source Polling
* (C) 2008-2010,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/entropy_src.h>

#include <botan/rng.h>

#if defined(BOTAN_HAS_SYSTEM_RNG)
   #include <botan/system_rng.h>
#endif

#if defined(BOTAN_HAS_PROCESSOR_RNG)
   #include <botan/processor_rng.h>
#endif

#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
   #include <botan/internal/rdseed.h>
#endif

#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
   #include <botan/internal/es_win32.h>
#endif

#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
   #include <botan/internal/getentropy.h>
#endif

#if defined(BOTAN_HAS_JITTER_RNG)
   #include <botan/jitter_rng.h>
#endif

namespace Botan {

namespace {

#if defined(BOTAN_HAS_SYSTEM_RNG)

class System_RNG_EntropySource final : public Entropy_Source {
   public:
      size_t poll(RandomNumberGenerator& rng) override {
         const size_t poll_bits = RandomNumberGenerator::DefaultPollBits;
         rng.reseed_from_rng(system_rng(), poll_bits);
         return poll_bits;
      }

      std::string name() const override { return "system_rng"; }
};

#endif

#if defined(BOTAN_HAS_PROCESSOR_RNG)

class Processor_RNG_EntropySource final : public Entropy_Source {
   public:
      size_t poll(RandomNumberGenerator& rng) override {
         /*
         * Intel's documentation for RDRAND at
         * https://software.intel.com/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide
         * claims that software can guarantee a reseed event by polling enough data:
         * "There is an upper bound of 511 samples per seed in the implementation
         * where samples are 128 bits in size and can provide two 64-bit random
         * numbers each."
         *
         * By requesting 65536 bits we are asking for 512 samples and thus are assured
         * that at some point in producing the output, at least one reseed of the
         * internal state will occur.
         *
         * The reseeding conditions of the POWER and ARM processor RNGs are not known
         * but probably work in a somewhat similar manner. The exact amount requested
         * may be tweaked if and when such conditions become publically known.
         */
         const size_t poll_bits = 65536;
         rng.reseed_from_rng(m_hwrng, poll_bits);
         // Avoid trusting a black box, don't count this as contributing entropy:
         return 0;
      }

      std::string name() const override { return m_hwrng.name(); }

   private:
      Processor_RNG m_hwrng;
};

#endif

#if defined(BOTAN_HAS_JITTER_RNG)

class Jitter_RNG_EntropySource final : public Entropy_Source {
   public:
      size_t poll(RandomNumberGenerator& rng) override {
         rng.reseed_from_rng(m_rng);
         return RandomNumberGenerator::DefaultPollBits;
      }

      std::string name() const override { return m_rng.name(); }

   private:
      Jitter_RNG m_rng;
};

#endif

}  // namespace

std::unique_ptr<Entropy_Source> Entropy_Source::create(std::string_view name) {
#if defined(BOTAN_HAS_SYSTEM_RNG)
   if(name == "system_rng") {
      return std::make_unique<System_RNG_EntropySource>();
   }
#endif

#if defined(BOTAN_HAS_PROCESSOR_RNG)
   if(name == "hwrng") {
      if(Processor_RNG::available()) {
         return std::make_unique<Processor_RNG_EntropySource>();
      }
   }
#endif

#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
   if(name == "rdseed") {
      return std::make_unique<Intel_Rdseed>();
   }
#endif

#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
   if(name == "getentropy") {
      return std::make_unique<Getentropy>();
   }
#endif

#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
   if(name == "system_stats") {
      return std::make_unique<Win32_EntropySource>();
   }
#endif

#if defined(BOTAN_HAS_JITTER_RNG)
   if(name == "jitter_rng") {
      return std::make_unique<Jitter_RNG_EntropySource>();
   }
#endif

   BOTAN_UNUSED(name);
   return nullptr;
}

void Entropy_Sources::add_source(std::unique_ptr<Entropy_Source> src) {
   if(src) {
      m_srcs.push_back(std::move(src));
   }
}

std::vector<std::string> Entropy_Sources::enabled_sources() const {
   std::vector<std::string> sources;
   sources.reserve(m_srcs.size());
   for(const auto& src : m_srcs) {
      sources.push_back(src->name());
   }
   return sources;
}

size_t Entropy_Sources::poll(RandomNumberGenerator& rng, size_t poll_bits, std::chrono::milliseconds timeout) {
#if defined(BOTAN_TARGET_OS_HAS_SYSTEM_CLOCK)
   typedef std::chrono::system_clock clock;
   auto timeout_expired = [to = clock::now() + timeout] { return clock::now() > to; };
#else
   auto timeout_expired = [] { return false; };
#endif

   size_t bits_collected = 0;

   for(auto& src : m_srcs) {
      bits_collected += src->poll(rng);

      if(bits_collected >= poll_bits || timeout_expired()) {
         break;
      }
   }

   return bits_collected;
}

size_t Entropy_Sources::poll_just(RandomNumberGenerator& rng, std::string_view the_src) {
   for(auto& src : m_srcs) {
      if(src->name() == the_src) {
         return src->poll(rng);
      }
   }

   return 0;
}

Entropy_Sources::Entropy_Sources(const std::vector<std::string>& sources) {
   for(auto&& src_name : sources) {
      add_source(Entropy_Source::create(src_name));
   }
}

Entropy_Sources& Entropy_Sources::global_sources() {
   static Entropy_Sources global_entropy_sources({"rdseed", "hwrng", "getentropy", "system_rng", "system_stats"});

   return global_entropy_sources;
}

}  // namespace Botan

1	/*
2	* Entropy Source Polling
3	* (C) 2008-2010,2015 Jack Lloyd
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/entropy_src.h>
9
10	#include <botan/rng.h>
11
12	#if defined(BOTAN_HAS_SYSTEM_RNG)
13	#include <botan/system_rng.h>
14	#endif
15
16	#if defined(BOTAN_HAS_PROCESSOR_RNG)
17	#include <botan/processor_rng.h>
18	#endif
19
20	#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
21	#include <botan/internal/rdseed.h>
22	#endif
23
24	#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
25	#include <botan/internal/es_win32.h>
26	#endif
27
28	#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
29	#include <botan/internal/getentropy.h>
30	#endif
31
32	#if defined(BOTAN_HAS_JITTER_RNG)
33	#include <botan/jitter_rng.h>
34	#endif
35
36	namespace Botan {
37
38	namespace {
39
40	#if defined(BOTAN_HAS_SYSTEM_RNG)
41
42	class System_RNG_EntropySource final : public Entropy_Source {	3✔
43	public:
44	size_t poll(RandomNumberGenerator& rng) override {	4✔
45	const size_t poll_bits = RandomNumberGenerator::DefaultPollBits;	4✔
46	rng.reseed_from_rng(system_rng(), poll_bits);	4✔
47	return poll_bits;	4✔
48	}
49
50	std::string name() const override { return "system_rng"; }	6✔
51	};
52
53	#endif
54
55	#if defined(BOTAN_HAS_PROCESSOR_RNG)
56
57	class Processor_RNG_EntropySource final : public Entropy_Source {	3✔
58	public:
59	size_t poll(RandomNumberGenerator& rng) override {	5✔
60	/*
61	* Intel's documentation for RDRAND at
62	* https://software.intel.com/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide
63	* claims that software can guarantee a reseed event by polling enough data:
64	* "There is an upper bound of 511 samples per seed in the implementation
65	* where samples are 128 bits in size and can provide two 64-bit random
66	* numbers each."
67	*
68	* By requesting 65536 bits we are asking for 512 samples and thus are assured
69	* that at some point in producing the output, at least one reseed of the
70	* internal state will occur.
71	*
72	* The reseeding conditions of the POWER and ARM processor RNGs are not known
73	* but probably work in a somewhat similar manner. The exact amount requested
74	* may be tweaked if and when such conditions become publically known.
75	*/
76	const size_t poll_bits = 65536;	5✔
77	rng.reseed_from_rng(m_hwrng, poll_bits);	5✔
78	// Avoid trusting a black box, don't count this as contributing entropy:
79	return 0;	5✔
80	}
81
82	std::string name() const override { return m_hwrng.name(); }	14✔
83
84	private:
85	Processor_RNG m_hwrng;
86	};
87
88	#endif
89
90	#if defined(BOTAN_HAS_JITTER_RNG)
91
92	class Jitter_RNG_EntropySource final : public Entropy_Source {	1✔
93	public:
94	size_t poll(RandomNumberGenerator& rng) override {	1✔
95	rng.reseed_from_rng(m_rng);	1✔
96	return RandomNumberGenerator::DefaultPollBits;	1✔
97	}
98
99	std::string name() const override { return m_rng.name(); }	×
100
101	private:
102	Jitter_RNG m_rng;
103	};
104
105	#endif
106
107	} // namespace
108
109	std::unique_ptr<Entropy_Source> Entropy_Source::create(std::string_view name) {	16✔
110	#if defined(BOTAN_HAS_SYSTEM_RNG)
111	if(name == "system_rng") {	16✔
112	return std::make_unique<System_RNG_EntropySource>();	3✔
113	}
114	#endif
115
116	#if defined(BOTAN_HAS_PROCESSOR_RNG)
117	if(name == "hwrng") {	13✔
118	if(Processor_RNG::available()) {	3✔
119	return std::make_unique<Processor_RNG_EntropySource>();	3✔
120	}
121	}
122	#endif
123
124	#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
125	if(name == "rdseed") {	10✔
126	return std::make_unique<Intel_Rdseed>();	3✔
127	}
128	#endif
129
130	#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
131	if(name == "getentropy") {	7✔
132	return std::make_unique<Getentropy>();	3✔
133	}
134	#endif
135
136	#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
137	if(name == "system_stats") {
138	return std::make_unique<Win32_EntropySource>();
139	}
140	#endif
141
142	#if defined(BOTAN_HAS_JITTER_RNG)
143	if(name == "jitter_rng") {	4✔
144	return std::make_unique<Jitter_RNG_EntropySource>();	1✔
145	}
146	#endif
147
148	BOTAN_UNUSED(name);	3✔
149	return nullptr;	3✔
150	}
151
152	void Entropy_Sources::add_source(std::unique_ptr<Entropy_Source> src) {	22✔
153	if(src) {	22✔
154	m_srcs.push_back(std::move(src));	19✔
155	}
156	}	22✔
157
158	std::vector<std::string> Entropy_Sources::enabled_sources() const {	2✔
159	std::vector<std::string> sources;	2✔
160	sources.reserve(m_srcs.size());	2✔
161	for(const auto& src : m_srcs) {	10✔
162	sources.push_back(src->name());	16✔
163	}
164	return sources;	2✔
165	}	×
166
167	size_t Entropy_Sources::poll(RandomNumberGenerator& rng, size_t poll_bits, std::chrono::milliseconds timeout) {	10✔
168	#if defined(BOTAN_TARGET_OS_HAS_SYSTEM_CLOCK)
169	typedef std::chrono::system_clock clock;	10✔
170	auto timeout_expired = [to = clock::now() + timeout] { return clock::now() > to; };	14✔
171	#else
172	auto timeout_expired = [] { return false; };
173	#endif
174
175	size_t bits_collected = 0;	10✔
176
177	for(auto& src : m_srcs) {	14✔
178	bits_collected += src->poll(rng);	10✔
179
180	if(bits_collected >= poll_bits \|\| timeout_expired()) {	10✔
181	break;
182	}
183	}
184
185	return bits_collected;	6✔
186	}
187
188	size_t Entropy_Sources::poll_just(RandomNumberGenerator& rng, std::string_view the_src) {	16✔
189	for(auto& src : m_srcs) {	40✔
190	if(src->name() == the_src) {	80✔
191	return src->poll(rng);	16✔
192	}
193	}
194
195	return 0;
196	}
197
198	Entropy_Sources::Entropy_Sources(const std::vector<std::string>& sources) {	3✔
199	for(auto&& src_name : sources) {	18✔
200	add_source(Entropy_Source::create(src_name));	30✔
201	}
202	}	3✔
203
204	Entropy_Sources& Entropy_Sources::global_sources() {	8✔
205	static Entropy_Sources global_entropy_sources({"rdseed", "hwrng", "getentropy", "system_rng", "system_stats"});	8✔
206
207	return global_entropy_sources;	8✔
208	}
209
210	} // namespace Botan

randombit / botan / 13190843806

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