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/*
* (C) 2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "apps.h"
#include <botan/entropy_src.h>
#include <botan/auto_rng.h>
#if defined(BOTAN_HAS_SYSTEM_RNG)
#include <botan/system_rng.h>
#endif
namespace {
int rng(int argc, char* argv[])
{
if(argc == 1)
{
std::cout << "Usage: " << argv[0] << " [--raw-entropy] [n]" << std::endl;
return 1;
}
try
{
const size_t amt = to_u32bit(argv[argc-1]);
const bool raw = (argc == 3 && std::string(argv[1]) == "--raw-entropy");
#if defined(BOTAN_HAS_SYSTEM_RNG)
std::cout << "System " << hex_encode(system_rng().random_vec(amt)) << std::endl;
#endif
if(!raw)
{
AutoSeeded_RNG rng;
std::cout << hex_encode(rng.random_vec(amt)) << std::endl;
}
else
{
double total_collected = 0;
Entropy_Accumulator accum(
[amt,&total_collected](const byte in[], size_t in_len, double entropy_estimate)
{
std::cout << "Collected estimated "<< entropy_estimate << " bits in "
<< hex_encode(in, in_len) << std::endl;
total_collected += entropy_estimate;
return total_collected >= amt;
});
Entropy_Sources::global_sources().poll(accum);
}
}
catch(std::exception& e)
{
std::cout << "Error: " << e.what() << std::endl;
return 1;
}
return 0;
}
REGISTER_APP(rng);
}
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