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/*
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/rng.h>
#include <botan/entropy_src.h>
#include <botan/loadstor.h>
#include <botan/internal/os_utils.h>
#if defined(BOTAN_HAS_AUTO_SEEDING_RNG)
#include <botan/auto_rng.h>
#endif
namespace Botan {
void RandomNumberGenerator::randomize_with_ts_input(uint8_t output[], size_t output_len)
{
if(this->accepts_input())
{
/*
Form additional input which is provided to the PRNG implementation
to paramaterize the KDF output.
*/
uint8_t additional_input[16] = { 0 };
store_le(OS::get_system_timestamp_ns(), additional_input);
store_le(OS::get_high_resolution_clock(), additional_input + 8);
this->randomize_with_input(output, output_len, additional_input, sizeof(additional_input));
}
else
{
this->randomize(output, output_len);
}
}
void RandomNumberGenerator::randomize_with_input(uint8_t output[], size_t output_len,
const uint8_t input[], size_t input_len)
{
this->add_entropy(input, input_len);
this->randomize(output, output_len);
}
size_t RandomNumberGenerator::reseed(Entropy_Sources& srcs,
size_t poll_bits,
std::chrono::milliseconds poll_timeout)
{
if(this->accepts_input())
{
return srcs.poll(*this, poll_bits, poll_timeout);
}
else
{
return 0;
}
}
void RandomNumberGenerator::reseed_from_rng(RandomNumberGenerator& rng, size_t poll_bits)
{
if(this->accepts_input())
{
secure_vector<uint8_t> buf(poll_bits / 8);
rng.randomize(buf.data(), buf.size());
this->add_entropy(buf.data(), buf.size());
}
}
RandomNumberGenerator* RandomNumberGenerator::make_rng()
{
#if defined(BOTAN_HAS_AUTO_SEEDING_RNG)
return new AutoSeeded_RNG;
#else
throw Exception("make_rng failed, no AutoSeeded_RNG in this build");
#endif
}
#if defined(BOTAN_TARGET_OS_HAS_THREADS)
#if defined(BOTAN_HAS_AUTO_SEEDING_RNG)
Serialized_RNG::Serialized_RNG() : m_rng(new AutoSeeded_RNG) {}
#else
Serialized_RNG::Serialized_RNG()
{
throw Exception("Serialized_RNG default constructor failed: AutoSeeded_RNG disabled in build");
}
#endif
#endif
}
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