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/*
* RDRAND RNG
* (C) 2016,2019 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/rdrand_rng.h>
#include <botan/processor_rng.h>
#include <botan/loadstor.h>
namespace Botan {
void RDRAND_RNG::randomize(uint8_t out[], size_t out_len)
{
Processor_RNG rng;
rng.randomize(out, out_len);
}
RDRAND_RNG::RDRAND_RNG()
{
// Will throw if instruction is not available
Processor_RNG rng;
}
//static
bool RDRAND_RNG::available()
{
return Processor_RNG::available();
}
//static
uint32_t RDRAND_RNG::rdrand()
{
Processor_RNG rng;
for(;;)
{
try
{
uint8_t out[4];
rng.randomize(out, 4);
return load_le<uint32_t>(out, 0);
}
catch(PRNG_Unseeded&) {}
}
}
//static
uint32_t RDRAND_RNG::rdrand_status(bool& ok)
{
ok = false;
Processor_RNG rng;
try
{
uint8_t out[4];
rng.randomize(out, 4);
ok = true;
return load_le<uint32_t>(out, 0);
}
catch(PRNG_Unseeded&) {}
return 0;
}
}