int main(int argc, char *argv[])
{
uint32_t bit;
uint32_t i;
uint32_t nb_bits_samples = NB_BITS_SAMPLES;
uint32_t nb_bytes_samples = nb_bits_samples / 8;
uint32_t nb_bytes = 0;
uint8_t samples[nb_bytes_samples];
uint8_t test = 0;
signal(SIGINT, signal_handler);
if(argc > 1 && strcmp(argv[1], "-d") == 0)
daemonize();
if(argc > 1 && strcmp(argv[1], "-t") == 0)
test = 1;
create_fifo_and_wait("w", "Waiting for server to start...", "Server started : could start Random numbers generation.");
qrand_setup();
while (keep_going)
{
for (i = 0; i < nb_bits_samples; i++)
{
bit = qrand();
//When we want to test the rng, we don't want it to be unbiaise
if(test == 1)
{
nb_bytes = build_byte(bit, (uint8_t*)&samples);
}
else
{
nb_bytes = exclusive_or(bit, (uint8_t*)&samples);
}
if(nb_bytes >= nb_bytes_samples)
{
send_numbers((uint8_t*)&samples, nb_bytes_samples);
}
usleep(SLEEP_INTERVAL);
}
}
qrand_close();
return 0;
}
/*Another algorithm to reduice biais, used by Giorgio Vazzana but reduice the
rate of number generation.
*/
uint32_t von_neumann(uint32_t bit, uint8_t *samples)
{
static uint32_t previous = 0;
static uint32_t flip_flop = 0;
uint32_t nb_bytes = 0;
flip_flop = !flip_flop;
if(flip_flop)
{
if(previous != bit)
{
nb_bytes = build_byte(previous, samples);
}
}
previous = bit;
return nb_bytes;
}
/*Exclusive XOR used by the PEAR to reduice bias*/
uint32_t exclusive_or(uint32_t bit, uint8_t *samples)
{
static uint32_t flip_flop = 0;
flip_flop = !flip_flop;
return build_byte(flip_flop ^ bit, samples);
}
