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/*
* Global PRNG
* (C) 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/libstate.h>
#include <botan/mutex.h>
#if defined(BOTAN_HAS_RANDPOOL)
#include <botan/randpool.h>
#endif
#if defined(BOTAN_HAS_HMAC_RNG)
#include <botan/hmac_rng.h>
#endif
#if defined(BOTAN_HAS_X931_RNG)
#include <botan/x931_rng.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
#include <botan/internal/hres_timer.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)
#include <botan/internal/es_unix.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_FTW)
#include <botan/internal/es_ftw.h>
#endif
namespace Botan {
namespace {
/**
* Add any known entropy sources to this RNG
*/
void add_entropy_sources(RandomNumberGenerator* rng)
{
#if defined(BOTAN_HAS_ENTROPY_SRC_HIGH_RESOLUTION_TIMER)
rng->add_entropy_source(new High_Resolution_Timestamp);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM)
rng->add_entropy_source(
new Device_EntropySource(
split_on("/dev/urandom:/dev/random:/dev/srandom", ':')
)
);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
rng->add_entropy_source(
new EGD_EntropySource(split_on("/var/run/egd-pool:/dev/egd-pool", ':'))
);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
rng->add_entropy_source(new Win32_CAPI_EntropySource);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_FTW)
rng->add_entropy_source(new FTW_EntropySource("/proc"));
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
rng->add_entropy_source(new Win32_EntropySource);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
rng->add_entropy_source(new BeOS_EntropySource);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX)
rng->add_entropy_source(
new Unix_EntropySource(split_on("/bin:/sbin:/usr/bin:/usr/sbin", ':'))
);
#endif
}
class Serialized_PRNG : public RandomNumberGenerator
{
public:
void randomize(byte out[], u32bit len)
{
Mutex_Holder lock(mutex);
rng->randomize(out, len);
}
bool is_seeded() const
{
Mutex_Holder lock(mutex);
return rng->is_seeded();
}
void clear()
{
Mutex_Holder lock(mutex);
rng->clear();
}
std::string name() const
{
Mutex_Holder lock(mutex);
return rng->name();
}
void reseed(u32bit poll_bits)
{
Mutex_Holder lock(mutex);
rng->reseed(poll_bits);
}
void add_entropy_source(EntropySource* es)
{
Mutex_Holder lock(mutex);
rng->add_entropy_source(es);
}
void add_entropy(const byte in[], u32bit len)
{
Mutex_Holder lock(mutex);
rng->add_entropy(in, len);
}
// We do not own the mutex; Library_State does
Serialized_PRNG(RandomNumberGenerator* r, Mutex* m) :
mutex(m), rng(r) {}
~Serialized_PRNG() { delete rng; }
private:
Mutex* mutex;
RandomNumberGenerator* rng;
};
}
RandomNumberGenerator* Library_State::make_global_rng(Algorithm_Factory& af,
Mutex* mutex)
{
RandomNumberGenerator* rng = 0;
#if defined(BOTAN_HAS_HMAC_RNG)
rng = new HMAC_RNG(af.make_mac("HMAC(SHA-512)"),
af.make_mac("HMAC(SHA-256)"));
#elif defined(BOTAN_HAS_RANDPOOL) && defined(BOTAN_HAS_AES)
rng = new Randpool(af.make_block_cipher("AES-256"),
af.make_mac("HMAC(SHA-256)"));
#endif
if(!rng)
throw Internal_Error("No usable RNG found enabled in build");
/* If X9.31 is available, use it to wrap the other RNG as a failsafe */
#if defined(BOTAN_HAS_X931_RNG) && defined(BOTAN_HAS_AES)
rng = new ANSI_X931_RNG(af.make_block_cipher("AES-256"), rng);
#endif
add_entropy_sources(rng);
rng->reseed(256);
return new Serialized_PRNG(rng, mutex);
}
}
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