Botan 3.3.0
Crypto and TLS for C&
Public Member Functions | Static Public Member Functions | List of all members
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 88 of file entropy_srcs.cpp.

88 {
89#if defined(BOTAN_HAS_SYSTEM_RNG)
90 if(name == "system_rng") {
91 return std::make_unique<System_RNG_EntropySource>();
92 }
93#endif
94
95#if defined(BOTAN_HAS_PROCESSOR_RNG)
96 if(name == "hwrng") {
98 return std::make_unique<Processor_RNG_EntropySource>();
99 }
100 }
101#endif
102
103#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
104 if(name == "rdseed") {
105 return std::make_unique<Intel_Rdseed>();
106 }
107#endif
108
109#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
110 if(name == "getentropy") {
111 return std::make_unique<Getentropy>();
112 }
113#endif
114
115#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
116 if(name == "system_stats") {
117 return std::make_unique<Win32_EntropySource>();
118 }
119#endif
120
122 return nullptr;
123}
#define BOTAN_UNUSED
Definition assert.h:118
virtual std::string name() const =0

References Botan::Processor_RNG::available(), BOTAN_UNUSED, and Botan::Entropy_Source::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 15 of file es_win32.cpp.

15 {
16 rng.add_entropy_T(::GetTickCount());
17 rng.add_entropy_T(::GetMessagePos());
18 rng.add_entropy_T(::GetMessageTime());
19 rng.add_entropy_T(::GetInputState());
20
21 rng.add_entropy_T(::GetCurrentProcessId());
22 rng.add_entropy_T(::GetCurrentThreadId());
23
24 SYSTEM_INFO sys_info;
25 ::GetSystemInfo(&sys_info);
26 rng.add_entropy_T(sys_info);
27
28 MEMORYSTATUSEX mem_info;
29 ::GlobalMemoryStatusEx(&mem_info);
30 rng.add_entropy_T(mem_info);
31
32 POINT point;
33 ::GetCursorPos(&point);
34 rng.add_entropy_T(point);
35
36 ::GetCaretPos(&point);
37 rng.add_entropy_T(point);
38
39 /*
40 Potential other sources to investigate
41
42 GetProductInfo
43 GetComputerNameExA
44 GetSystemFirmwareTable
45 GetVersionExA
46 GetProcessorSystemCycleTime
47 GetProcessHandleCount(GetCurrentProcess())
48 GetThreadTimes(GetCurrentThread())
49 QueryThreadCycleTime
50 QueryIdleProcessorCycleTime
51 QueryUnbiasedInterruptTime
52 */
53
54 // We assume all of the above is basically junk
55 return 0;
56}

References Botan::RandomNumberGenerator::add_entropy_T().


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