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/*
* Global PRNG
* (C) 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/libstate.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_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
namespace Botan {
std::vector<std::unique_ptr<EntropySource>> Library_State::entropy_sources()
{
std::vector<std::unique_ptr<EntropySource>> sources;
#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
sources.push_back(std::unique_ptr<EntropySource>(new High_Resolution_Timestamp));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_RDRAND)
sources.push_back(std::unique_ptr<EntropySource>(new Intel_Rdrand));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM)
sources.push_back(std::unique_ptr<EntropySource>(new Device_EntropySource(
{ "/dev/random", "/dev/srandom", "/dev/urandom" }
)));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
sources.push_back(std::unique_ptr<EntropySource>(new Win32_CAPI_EntropySource));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_PROC_WALKER)
sources.push_back(std::unique_ptr<EntropySource>(
new ProcWalking_EntropySource("/proc")));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
sources.push_back(std::unique_ptr<EntropySource>(new Win32_EntropySource));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
sources.push_back(std::unique_ptr<EntropySource>(new BeOS_EntropySource));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX_PROCESS_RUNNER)
sources.push_back(std::unique_ptr<EntropySource>(
new Unix_EntropySource(
{ "/bin", "/sbin", "/usr/bin", "/usr/sbin" }
)));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
sources.push_back(std::unique_ptr<EntropySource>(
new EGD_EntropySource({ "/var/run/egd-pool", "/dev/egd-pool" })
));
#endif
return sources;
}
namespace {
class Serialized_PRNG : public RandomNumberGenerator
{
public:
void randomize(byte out[], size_t len)
{
std::lock_guard<std::mutex> lock(mutex);
rng->randomize(out, len);
}
bool is_seeded() const
{
std::lock_guard<std::mutex> lock(mutex);
return rng->is_seeded();
}
void clear()
{
std::lock_guard<std::mutex> lock(mutex);
rng->clear();
}
std::string name() const
{
std::lock_guard<std::mutex> lock(mutex);
return rng->name();
}
void reseed(size_t poll_bits)
{
std::lock_guard<std::mutex> lock(mutex);
rng->reseed(poll_bits);
}
void add_entropy(const byte in[], size_t len)
{
std::lock_guard<std::mutex> lock(mutex);
rng->add_entropy(in, len);
}
// We do not own the mutex; Library_State does
Serialized_PRNG(RandomNumberGenerator* r, std::mutex& m) :
mutex(m), rng(r) {}
private:
std::mutex& mutex;
std::unique_ptr<RandomNumberGenerator> rng;
};
}
void Library_State::poll_available_sources(class Entropy_Accumulator& accum)
{
std::lock_guard<std::mutex> lock(m_entropy_src_mutex);
const size_t poll_bits = accum.desired_remaining_bits();
if(!m_sources.empty())
{
size_t poll_attempt = 0;
while(!accum.polling_goal_achieved() && poll_attempt < poll_bits)
{
const size_t src_idx = poll_attempt % m_sources.size();
m_sources[src_idx]->poll(accum);
++poll_attempt;
}
}
}
RandomNumberGenerator* Library_State::make_global_rng(Algorithm_Factory& af,
std::mutex& mutex)
{
auto rng = RandomNumberGenerator::make_rng(af);
if(!rng)
throw Internal_Error("No usable RNG found enabled in build");
return new Serialized_PRNG(rng.release(), mutex);
}
}
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