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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>
#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
#if defined(BOTAN_HAS_ENTROPY_SRC_DARWIN_SECRANDOM)
#include <botan/internal/darwin_secrandom.h>
#endif
namespace Botan {
namespace {
std::vector<std::unique_ptr<EntropySource>> get_default_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_UNIX_PROCESS_RUNNER)
sources.push_back(std::unique_ptr<EntropySource>(new UnixProcessInfo_EntropySource));
#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
#if defined(BOTAN_HAS_ENTROPY_SRC_DARWIN_SECRANDOM)
sources.push_back(std::unique_ptr<EntropySource>(new Darwin_SecRandom));
#endif
return sources;
}
}
//static
void EntropySource::poll_available_sources(class Entropy_Accumulator& accum)
{
static std::vector<std::unique_ptr<EntropySource>> g_sources(get_default_entropy_sources());
if(g_sources.empty())
throw std::runtime_error("No entropy sources enabled at build time, RNG poll failed");
size_t poll_attempt = 0;
while(!accum.polling_finished() && poll_attempt < 16)
{
const size_t src_idx = poll_attempt % g_sources.size();
g_sources[src_idx]->poll(accum);
++poll_attempt;
}
}
}
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