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/*************************************************
* Random Number Generator Base Source File *
* (C) 1999-2008 Jack Lloyd *
*************************************************/
#include <botan/rng.h>
#include <botan/util.h>
#include <botan/parsing.h>
#include <botan/timers.h>
#if defined(BOTAN_HAS_RANDPOOL)
#include <botan/lookup.h>
#include <botan/randpool.h>
#if defined(BOTAN_HAS_X931_RNG)
#include <botan/x931_rng.h>
#endif
#endif
#if defined(BOTAN_HAS_TIMER_HARDWARE)
#include <botan/tm_hard.h>
#elif defined(BOTAN_HAS_TIMER_POSIX)
#include <botan/tm_posix.h>
#elif defined(BOTAN_HAS_TIMER_UNIX)
#include <botan/tm_unix.h>
#elif defined(BOTAN_HAS_TIMER_WIN32)
#include <botan/tm_win32.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DEVICE)
#include <botan/es_dev.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_EGD)
#include <botan/es_egd.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_UNIX)
#include <botan/es_unix.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
#include <botan/es_beos.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_CAPI)
#include <botan/es_capi.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_WIN32)
#include <botan/es_win32.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_FTW)
#include <botan/es_ftw.h>
#endif
namespace Botan {
/*************************************************
* Default fast poll for EntropySources *
*************************************************/
u32bit EntropySource::fast_poll(byte buf[], u32bit len)
{
return this->slow_poll(buf, len);
}
/*************************************************
* Get a single random byte *
*************************************************/
byte RandomNumberGenerator::next_byte()
{
byte out;
this->randomize(&out, 1);
return out;
}
/*************************************************
* Create and seed a new RNG object *
*************************************************/
RandomNumberGenerator* RandomNumberGenerator::make_rng()
{
#if defined(BOTAN_HAS_RANDPOOL)
/* Randpool is required for make_rng to work */
RandomNumberGenerator* rng = new Randpool(get_block_cipher("AES-256"),
get_mac("HMAC(SHA-256)"));
/* If X9.31 is available, wrap the Randpool algorithm in it */
#if defined(BOTAN_HAS_X931_RNG)
rng = new ANSI_X931_RNG(get_block_cipher("AES-256"), rng);
#endif
#if defined(BOTAN_HAS_TIMER_HARDWARE)
rng->add_entropy_source(new Hardware_Timer);
#elif defined(BOTAN_HAS_TIMER_POSIX)
rng->add_entropy_source(new POSIX_Timer);
#elif defined(BOTAN_HAS_TIMER_UNIX)
rng->add_entropy_source(new Unix_Timer);
#elif defined(BOTAN_HAS_TIMER_WIN32)
rng->add_entropy_source(new Win32_Timer);
#else
rng->add_entropy_source(new Timer);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_DEVICE)
rng->add_entropy_source(
new Device_EntropySource(
split_on("/dev/random:/dev/srandom:/dev/urandom", ':')
)
);
#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_WIN32)
rng->add_entropy_source(new Win32_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
#if defined(BOTAN_HAS_ENTROPY_SRC_BEOS)
rng->add_entropy_source(new BeOS_EntropySource);
#endif
#if defined(BOTAN_HAS_ENTROPY_SRC_FTW)
rng->add_entropy_source(new FTW_EntropySource("/proc"));
#endif
return rng;
#endif
throw Algorithm_Not_Found("RandomNumberGenerator::make_rng - no RNG found");
}
}
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