5079590438

Committed 25 May 2023 12:28PM UTC coverage: 92.228% (+0.5%) from 91.723%

Build # 5079590438

Build Type

Pull #3502

github

Pull Request Pull Request #3502: Apply clang-format to the codebase

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92.54

/src/lib/ffi/ffi_rng.cpp

/*
* (C) 2015,2017 Jack Lloyd
* (C) 2021 René Fischer
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/ffi.h>

#include <botan/auto_rng.h>
#include <botan/system_rng.h>
#include <botan/internal/ffi_rng.h>
#include <botan/internal/ffi_util.h>

#include <functional>
#include <memory>

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

extern "C" {

using namespace Botan_FFI;

int botan_rng_init(botan_rng_t* rng_out, const char* rng_type) {
   return ffi_guard_thunk(__func__, [=]() -> int {
      if(rng_out == nullptr)
         return BOTAN_FFI_ERROR_NULL_POINTER;

      const std::string rng_type_s(rng_type ? rng_type : "system");

      std::unique_ptr<Botan::RandomNumberGenerator> rng;

      if(rng_type_s == "system") {
         rng = std::make_unique<Botan::System_RNG>();
      } else if(rng_type_s == "user" || rng_type_s == "user-threadsafe") {
         rng = std::make_unique<Botan::AutoSeeded_RNG>();
      } else if(rng_type_s == "null") {
         rng = std::make_unique<Botan::Null_RNG>();
      }
#if defined(BOTAN_HAS_PROCESSOR_RNG)
      else if((rng_type_s == "rdrand" || rng_type_s == "hwrng") && Botan::Processor_RNG::available()) {
         rng = std::make_unique<Botan::Processor_RNG>();
      }
#endif

      if(!rng) {
         return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
      }

      *rng_out = new botan_rng_struct(std::move(rng));
      return BOTAN_FFI_SUCCESS;
   });
}

int botan_rng_init_custom(botan_rng_t* rng_out,
                          const char* rng_name,
                          void* context,
                          int (*get_cb)(void* context, uint8_t* out, size_t out_len),
                          int (*add_entropy_cb)(void* context, const uint8_t input[], size_t length),
                          void (*destroy_cb)(void* context)) {
   return ffi_guard_thunk(__func__, [=]() -> int {
      if(rng_out == nullptr)
         return BOTAN_FFI_ERROR_NULL_POINTER;

      if(rng_name == nullptr)
         return BOTAN_FFI_ERROR_NULL_POINTER;

      if(get_cb == nullptr)
         return BOTAN_FFI_ERROR_NULL_POINTER;

      class Custom_RNG : public Botan::RandomNumberGenerator {
         public:
            Custom_RNG(std::string_view name,
                       void* context,
                       int (*get_cb)(void* context, uint8_t* out, size_t out_len),
                       int (*add_entropy_cb)(void* context, const uint8_t input[], size_t length),
                       void (*destroy_cb)(void* context)) :
                  m_name(name) {
               m_context = context;
               m_get_cb = get_cb;
               m_add_entropy_cb = add_entropy_cb;
               m_destroy_cb = destroy_cb;
            }

            ~Custom_RNG() override {
               if(m_destroy_cb) {
                  m_destroy_cb(m_context);
               }
            }

            Custom_RNG(const Custom_RNG& other) = delete;
            Custom_RNG(Custom_RNG&& other) = delete;
            Custom_RNG& operator=(const Custom_RNG& other) = delete;
            Custom_RNG& operator=(Custom_RNG&& other) = delete;

         protected:
            void fill_bytes_with_input(std::span<uint8_t> output, std::span<const uint8_t> input) override {
               if(accepts_input() && !input.empty()) {
                  int rc = m_add_entropy_cb(m_context, input.data(), input.size());
                  if(rc) {
                     throw Botan::Invalid_State("Failed to add entropy via C callback, rc=" + std::to_string(rc));
                  }
               }

               if(!output.empty()) {
                  int rc = m_get_cb(m_context, output.data(), output.size());
                  if(rc) {
                     throw Botan::Invalid_State("Failed to get random from C callback, rc=" + std::to_string(rc));
                  }
               }
            }

         public:
            bool accepts_input() const override { return m_add_entropy_cb != nullptr; }

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

            void clear() override {}

            bool is_seeded() const override { return true; }

         private:
            std::string m_name;
            void* m_context;
            std::function<int(void* context, uint8_t* out, size_t out_len)> m_get_cb;
            std::function<int(void* context, const uint8_t input[], size_t length)> m_add_entropy_cb;
            std::function<void(void* context)> m_destroy_cb;
      };

      auto rng = std::make_unique<Custom_RNG>(rng_name, context, get_cb, add_entropy_cb, destroy_cb);

      *rng_out = new botan_rng_struct(std::move(rng));
      return BOTAN_FFI_SUCCESS;
   });
}

int botan_rng_destroy(botan_rng_t rng) { return BOTAN_FFI_CHECKED_DELETE(rng); }

int botan_rng_get(botan_rng_t rng, uint8_t* out, size_t out_len) {
   return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.randomize(out, out_len); });
}

int botan_system_rng_get(uint8_t* out, size_t out_len) {
   return ffi_guard_thunk(__func__, [=]() -> int {
      Botan::system_rng().randomize(out, out_len);
      return BOTAN_FFI_SUCCESS;
   });
}

int botan_rng_reseed(botan_rng_t rng, size_t bits) {
   return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.reseed_from_rng(Botan::system_rng(), bits); });
}

int botan_rng_add_entropy(botan_rng_t rng, const uint8_t* input, size_t len) {
   return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.add_entropy(input, len); });
}

int botan_rng_reseed_from_rng(botan_rng_t rng, botan_rng_t source_rng, size_t bits) {
   return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.reseed_from_rng(safe_get(source_rng), bits); });
}
}

1	/*
2	* (C) 2015,2017 Jack Lloyd
3	* (C) 2021 René Fischer
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/ffi.h>
9
10	#include <botan/auto_rng.h>
11	#include <botan/system_rng.h>
12	#include <botan/internal/ffi_rng.h>
13	#include <botan/internal/ffi_util.h>
14
15	#include <functional>
16	#include <memory>
17
18	#if defined(BOTAN_HAS_PROCESSOR_RNG)
19	#include <botan/processor_rng.h>
20	#endif
21
22	extern "C" {
23
24	using namespace Botan_FFI;
25
26	int botan_rng_init(botan_rng_t* rng_out, const char* rng_type) {	63✔
27	return ffi_guard_thunk(__func__, [=]() -> int {	63✔
28	if(rng_out == nullptr)	125✔
29	return BOTAN_FFI_ERROR_NULL_POINTER;
30
31	const std::string rng_type_s(rng_type ? rng_type : "system");	126✔
32
33	std::unique_ptr<Botan::RandomNumberGenerator> rng;	63✔
34
35	if(rng_type_s == "system") {	63✔
36	rng = std::make_unique<Botan::System_RNG>();	55✔
37	} else if(rng_type_s == "user" \|\| rng_type_s == "user-threadsafe") {	8✔
38	rng = std::make_unique<Botan::AutoSeeded_RNG>();	5✔
39	} else if(rng_type_s == "null") {	3✔
40	rng = std::make_unique<Botan::Null_RNG>();	1✔
41	}
42	#if defined(BOTAN_HAS_PROCESSOR_RNG)
43	else if((rng_type_s == "rdrand" \|\| rng_type_s == "hwrng") && Botan::Processor_RNG::available()) {	2✔
44	rng = std::make_unique<Botan::Processor_RNG>();	1✔
45	}
46	#endif
47
48	if(!rng) {	63✔
49	return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
50	}
51
52	*rng_out = new botan_rng_struct(std::move(rng));	62✔
53	return BOTAN_FFI_SUCCESS;	62✔
54	});	189✔
55	}
56
57	int botan_rng_init_custom(botan_rng_t* rng_out,	1✔
58	const char* rng_name,
59	void* context,
60	int (get_cb)(void context, uint8_t* out, size_t out_len),
61	int (add_entropy_cb)(void context, const uint8_t input[], size_t length),
62	void (destroy_cb)(void context)) {
63	return ffi_guard_thunk(__func__, [=]() -> int {	1✔
64	if(rng_out == nullptr)	2✔
65	return BOTAN_FFI_ERROR_NULL_POINTER;
66
67	if(rng_name == nullptr)	1✔
68	return BOTAN_FFI_ERROR_NULL_POINTER;
69
70	if(get_cb == nullptr)	1✔
71	return BOTAN_FFI_ERROR_NULL_POINTER;
72
73	class Custom_RNG : public Botan::RandomNumberGenerator {	1✔
74	public:
75	Custom_RNG(std::string_view name,	1✔
76	void* context,
77	int (get_cb)(void context, uint8_t* out, size_t out_len),
78	int (add_entropy_cb)(void context, const uint8_t input[], size_t length),
79	void (destroy_cb)(void context)) :	1✔
80	m_name(name) {	1✔
81	m_context = context;	1✔
82	m_get_cb = get_cb;	1✔
83	m_add_entropy_cb = add_entropy_cb;	1✔
84	m_destroy_cb = destroy_cb;	1✔
85	}	1✔
86
87	~Custom_RNG() override {	2✔
88	if(m_destroy_cb) {	1✔
89	m_destroy_cb(m_context);	1✔
90	}
91	}	5✔
92
93	Custom_RNG(const Custom_RNG& other) = delete;
94	Custom_RNG(Custom_RNG&& other) = delete;
95	Custom_RNG& operator=(const Custom_RNG& other) = delete;
96	Custom_RNG& operator=(Custom_RNG&& other) = delete;
97
98	protected:
99	void fill_bytes_with_input(std::span<uint8_t> output, std::span<const uint8_t> input) override {	4✔
100	if(accepts_input() && !input.empty()) {	4✔
101	int rc = m_add_entropy_cb(m_context, input.data(), input.size());	3✔
102	if(rc) {	3✔
103	throw Botan::Invalid_State("Failed to add entropy via C callback, rc=" + std::to_string(rc));	×
104	}
105	}
106
107	if(!output.empty()) {	4✔
108	int rc = m_get_cb(m_context, output.data(), output.size());	1✔
109	if(rc) {	1✔
110	throw Botan::Invalid_State("Failed to get random from C callback, rc=" + std::to_string(rc));	×
111	}
112	}
113	}	4✔
114
115	public:
116	bool accepts_input() const override { return m_add_entropy_cb != nullptr; }	4✔
117
118	std::string name() const override { return m_name; }	×
119
120	void clear() override {}	×
121
122	bool is_seeded() const override { return true; }	×
123
124	private:
125	std::string m_name;
126	void* m_context;
127	std::function<int(void* context, uint8_t* out, size_t out_len)> m_get_cb;
128	std::function<int(void* context, const uint8_t input[], size_t length)> m_add_entropy_cb;
129	std::function<void(void* context)> m_destroy_cb;
130	};
131
132	auto rng = std::make_unique<Custom_RNG>(rng_name, context, get_cb, add_entropy_cb, destroy_cb);	1✔
133
134	*rng_out = new botan_rng_struct(std::move(rng));	1✔
135	return BOTAN_FFI_SUCCESS;	1✔
136	});	2✔
137	}
138
139	int botan_rng_destroy(botan_rng_t rng) { return BOTAN_FFI_CHECKED_DELETE(rng); }	63✔
140
141	int botan_rng_get(botan_rng_t rng, uint8_t* out, size_t out_len) {	34✔
142	return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.randomize(out, out_len); });	68✔
143	}
144
145	int botan_system_rng_get(uint8_t* out, size_t out_len) {	1✔
146	return ffi_guard_thunk(__func__, [=]() -> int {	1✔
147	Botan::system_rng().randomize(out, out_len);	1✔
148	return BOTAN_FFI_SUCCESS;	1✔
149	});	1✔
150	}
151
152	int botan_rng_reseed(botan_rng_t rng, size_t bits) {	3✔
153	return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.reseed_from_rng(Botan::system_rng(), bits); });	6✔
154	}
155
156	int botan_rng_add_entropy(botan_rng_t rng, const uint8_t* input, size_t len) {	3✔
157	return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.add_entropy(input, len); });	6✔
158	}
159
160	int botan_rng_reseed_from_rng(botan_rng_t rng, botan_rng_t source_rng, size_t bits) {	5✔
161	return BOTAN_FFI_VISIT(rng, [=](auto& r) { r.reseed_from_rng(safe_get(source_rng), bits); });	10✔
162	}
163	}

randombit / botan / 5079590438

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