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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_SYSTEM_RNG)
#include <botan/system_rng.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_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
#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
#include <botan/internal/getentropy.h>
#endif
namespace Botan {
#if defined(BOTAN_HAS_SYSTEM_RNG)
namespace {
class System_RNG_EntropySource final : public Entropy_Source
{
public:
size_t poll(RandomNumberGenerator& rng) override
{
const size_t poll_bits = BOTAN_RNG_RESEED_POLL_BITS;
rng.reseed_from_rng(system_rng(), poll_bits);
return poll_bits;
}
std::string name() const override { return "system_rng"; }
};
}
#endif
std::unique_ptr<Entropy_Source> Entropy_Source::create(const std::string& name)
{
#if defined(BOTAN_HAS_SYSTEM_RNG)
if(name == "system_rng" || name == "win32_cryptoapi")
{
return std::unique_ptr<Entropy_Source>(new System_RNG_EntropySource);
}
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_RDRAND)
if(name == "rdrand")
{
return std::unique_ptr<Entropy_Source>(new Intel_Rdrand);
}
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_RDSEED)
if(name == "rdseed")
{
return std::unique_ptr<Entropy_Source>(new Intel_Rdseed);
}
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DARWIN_SECRANDOM)
if(name == "darwin_secrandom")
{
return std::unique_ptr<Entropy_Source>(new Darwin_SecRandom);
}
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY)
if(name == "getentropy")
{
return std::unique_ptr<Entropy_Source>(new Getentropy);
}
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM)
if(name == "dev_random")
{
return std::unique_ptr<Entropy_Source>(new Device_EntropySource(BOTAN_SYSTEM_RNG_POLL_DEVICES));
}
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_PROC_WALKER)
if(name == "proc_walk")
{
const std::string root_dir = BOTAN_ENTROPY_PROC_FS_PATH;
if(!root_dir.empty())
return std::unique_ptr<Entropy_Source>(new ProcWalking_EntropySource(root_dir));
}
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
if(name == "system_stats")
{
return std::unique_ptr<Entropy_Source>(new Win32_EntropySource);
}
#endif
BOTAN_UNUSED(name);
return std::unique_ptr<Entropy_Source>();
}
void Entropy_Sources::add_source(std::unique_ptr<Entropy_Source> src)
{
if(src.get())
{
m_srcs.push_back(std::move(src));
}
}
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;
size_t bits_collected = 0;
for(size_t i = 0; i != m_srcs.size(); ++i)
{
bits_collected += m_srcs[i]->poll(rng);
if (bits_collected >= poll_bits || clock::now() > deadline)
break;
}
return bits_collected;
}
size_t Entropy_Sources::poll_just(RandomNumberGenerator& rng, const std::string& the_src)
{
for(size_t i = 0; i != m_srcs.size(); ++i)
{
if(m_srcs[i]->name() == the_src)
{
return m_srcs[i]->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(BOTAN_ENTROPY_DEFAULT_SOURCES);
return global_entropy_sources;
}
}
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