Botan 3.8.1
Crypto and TLS for C&
Botan::Win32_EntropySource Class Referencefinal

#include <es_win32.h>

Inheritance diagram for Botan::Win32_EntropySource:
Botan::Entropy_Source

Public Member Functions

std::string name () const override
 
size_t poll (RandomNumberGenerator &rng) override
 

Static Public Member Functions

static std::unique_ptr< Entropy_Sourcecreate (std::string_view type)
 

Detailed Description

Win32 Entropy Source

Definition at line 18 of file es_win32.h.

Member Function Documentation

◆ create()

std::unique_ptr< Entropy_Source > Botan::Entropy_Source::create ( std::string_view type)
staticinherited

Return a new entropy source of a particular type, or null Each entropy source may require substantial resources (eg, a file handle or socket instance), so try to share them among multiple RNGs, or just use the preconfigured global list accessed by Entropy_Sources::global_sources()

Definition at line 111 of file entropy_srcs.cpp.

111 {
112#if defined(BOTAN_HAS_SYSTEM_RNG)
113 if(name == "system_rng") {
114 return std::make_unique<System_RNG_EntropySource>();
115 }
116#endif
117
118#if defined(BOTAN_HAS_PROCESSOR_RNG)
119 if(name == "hwrng") {
121 return std::make_unique<Processor_RNG_EntropySource>();
122 }
123 }
124#endif
125
126#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
127 if(name == "rdseed") {
128 return std::make_unique<Intel_Rdseed>();
129 }
130#endif
131
132#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
133 if(name == "getentropy") {
134 return std::make_unique<Getentropy>();
135 }
136#endif
137
138#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
139 if(name == "system_stats") {
140 return std::make_unique<Win32_EntropySource>();
141 }
142#endif
143
144#if defined(BOTAN_HAS_JITTER_RNG)
145 if(name == "jitter_rng") {
146 return std::make_unique<Jitter_RNG_EntropySource>();
147 }
148#endif
149
151 return nullptr;
152}
#define BOTAN_UNUSED
Definition assert.h:120
virtual std::string name() const =0

References Botan::Processor_RNG::available(), BOTAN_UNUSED, and name().

Referenced by Botan::Entropy_Sources::Entropy_Sources().

◆ name()

std::string Botan::Win32_EntropySource::name ( ) const
inlineoverridevirtual
Returns
name identifying this entropy source

Implements Botan::Entropy_Source.

Definition at line 20 of file es_win32.h.

20{ return "system_stats"; }

◆ poll()

size_t Botan::Win32_EntropySource::poll ( RandomNumberGenerator & rng)
overridevirtual

Perform an entropy gathering poll

Parameters
rngwill be provided with entropy via calls to add_entropy
Returns
conservative estimate of actual entropy added to rng during poll

Implements Botan::Entropy_Source.

Definition at line 17 of file es_win32.cpp.

17 {
18 rng.add_entropy_T(::GetTickCount());
19 rng.add_entropy_T(::GetMessagePos());
20 rng.add_entropy_T(::GetMessageTime());
21 rng.add_entropy_T(::GetInputState());
22
23 rng.add_entropy_T(::GetCurrentProcessId());
24 rng.add_entropy_T(::GetCurrentThreadId());
25
26 SYSTEM_INFO sys_info;
27 ::GetSystemInfo(&sys_info);
28 rng.add_entropy_T(sys_info);
29
30 MEMORYSTATUSEX mem_info;
31 ::GlobalMemoryStatusEx(&mem_info);
32 rng.add_entropy_T(mem_info);
33
34 POINT point;
35 ::GetCursorPos(&point);
36 rng.add_entropy_T(point);
37
38 ::GetCaretPos(&point);
39 rng.add_entropy_T(point);
40
41 /*
42 Potential other sources to investigate
43
44 GetProductInfo
45 GetComputerNameExA
46 GetSystemFirmwareTable
47 GetVersionExA
48 GetProcessorSystemCycleTime
49 GetProcessHandleCount(GetCurrentProcess())
50 GetThreadTimes(GetCurrentThread())
51 QueryThreadCycleTime
52 QueryIdleProcessorCycleTime
53 QueryUnbiasedInterruptTime
54 */
55
56 // We assume all of the above is basically junk
57 return 0;
58}

References Botan::RandomNumberGenerator::add_entropy_T().


The documentation for this class was generated from the following files: