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/*
* 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_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
#include <botan/internal/hres_timer.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_RDRAND)
#include <botan/internal/rdrand.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
#include <botan/internal/rdseed.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_PROCESS_RUNNER)
#include <botan/internal/unix_procs.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_PROC_WALKER)
#include <botan/internal/proc_walk.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DARWIN_SECRANDOM)
#include <botan/internal/darwin_secrandom.h>
#endif
namespace Botan {
std::unique_ptr<Entropy_Source> Entropy_Source::create(const std::string& name)
{
if(name == "timestamp")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
return std::unique_ptr<Entropy_Source>(new High_Resolution_Timestamp);
#endif
}
if(name == "rdrand")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_RDRAND)
return std::unique_ptr<Entropy_Source>(new Intel_Rdrand);
#endif
}
if(name == "rdseed")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
return std::unique_ptr<Entropy_Source>(new Intel_Rdseed);
#endif
}
if(name == "proc_info")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX_PROCESS_RUNNER)
return std::unique_ptr<Entropy_Source>(new UnixProcessInfo_EntropySource);
#endif
}
if(name == "darwin_secrandom")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_DARWIN_SECRANDOM)
return std::unique_ptr<Entropy_Source>(new Darwin_SecRandom);
#endif
}
if(name == "dev_random")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM)
return std::unique_ptr<Entropy_Source>(new Device_EntropySource(BOTAN_SYSTEM_RNG_POLL_DEVICES));
}
if(name == "win32_cryptoapi")
{
#elif defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
return std::unique_ptr<Entropy_Source>(new Win32_CAPI_EntropySource);
#endif
}
if(name == "proc_walk")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_PROC_WALKER)
return std::unique_ptr<Entropy_Source>(new ProcWalking_EntropySource("/proc"));
#endif
}
if(name == "system_stats")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
return std::unique_ptr<Entropy_Source>(new Win32_EntropySource);
#elif defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
return std::unique_ptr<Entropy_Source>(new BeOS_EntropySource);
#endif
}
if(name == "unix_procs")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX_PROCESS_RUNNER)
return std::unique_ptr<Entropy_Source>(new Unix_EntropySource(BOTAN_ENTROPY_SAFE_PATHS));
#endif
}
if(name == "egd")
{
#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
return std::unique_ptr<Entropy_Source>(new EGD_EntropySource(BOTAN_ENTROPY_EGD_PATHS));
#endif
}
return std::unique_ptr<Entropy_Source>();
}
void Entropy_Sources::add_source(std::unique_ptr<Entropy_Source> src)
{
if(src.get())
{
m_srcs.push_back(src.release());
}
}
std::vector<std::string> Entropy_Sources::enabled_sources() const
{
std::vector<std::string> sources;
for(size_t i = 0; i != m_srcs.size(); ++i)
{
sources.push_back(m_srcs[i]->name());
}
return sources;
}
size_t Entropy_Sources::poll(RandomNumberGenerator& rng,
size_t poll_bits,
std::chrono::milliseconds timeout)
{
typedef std::chrono::system_clock clock;
auto deadline = clock::now() + timeout;
double bits_collected = 0;
Entropy_Accumulator accum([&](const byte in[], size_t in_len, double entropy_estimate) {
rng.add_entropy(in, in_len);
bits_collected += entropy_estimate;
return (bits_collected >= poll_bits || clock::now() > deadline);
});
for(size_t i = 0; i != m_srcs.size(); ++i)
{
m_srcs[i]->poll(accum);
if(accum.polling_goal_achieved())
break;
}
return static_cast<size_t>(bits_collected);
}
bool Entropy_Sources::poll_just(Entropy_Accumulator& accum, const std::string& the_src)
{
for(size_t i = 0; i != m_srcs.size(); ++i)
{
if(m_srcs[i]->name() == the_src)
{
m_srcs[i]->poll(accum);
return true;
}
}
return false;
}
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()
{
for(size_t i = 0; i != m_srcs.size(); ++i)
{
delete m_srcs[i];
m_srcs[i] = nullptr;
}
m_srcs.clear();
}
Entropy_Sources& Entropy_Sources::global_sources()
{
static Entropy_Sources global_entropy_sources(BOTAN_ENTROPY_DEFAULT_SOURCES);
return global_entropy_sources;
}
}
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