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/*
* (C) 2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "tests.h"
#include "test_rng.h"
#include <botan/entropy_src.h>
#if defined(BOTAN_HAS_COMPRESSION)
#include <botan/compression.h>
#endif
namespace Botan_Tests {
namespace {
class Entropy_Source_Tests : public Test
{
public:
std::vector<Test::Result> run() override
{
Botan::Entropy_Sources& srcs = Botan::Entropy_Sources::global_sources();
std::vector<std::string> src_names = srcs.enabled_sources();
std::vector<Test::Result> results;
for(auto const& src_name : src_names)
{
Test::Result result("Entropy source " + src_name);
result.start_timer();
try
{
SeedCapturing_RNG rng;
size_t bits = srcs.poll_just(rng, src_name);
result.test_gte("Entropy estimate", rng.seed_material().size() * 8, bits);
if(rng.samples() > 0)
{
result.test_gte("Seed material bytes", rng.seed_material().size(), 1);
result.test_gte("Samples", rng.samples(), 1);
}
result.test_note("poll result", rng.seed_material());
#if defined(BOTAN_HAS_COMPRESSION)
if(!rng.seed_material().empty())
{
/*
* Skip bzip2 both due to OS X problem (GH #394) and because bzip2's
* large blocks cause the entropy differential test to fail sometimes.
*/
for(const std::string comp_algo : { "zlib", "lzma" })
{
std::unique_ptr<Botan::Compression_Algorithm> comp(Botan::make_compressor(comp_algo));
if(comp)
{
size_t comp1_size = 0;
try
{
Botan::secure_vector<uint8_t> compressed;
compressed.assign(rng.seed_material().begin(), rng.seed_material().end());
comp->start(9);
comp->finish(compressed);
comp1_size = compressed.size();
result.test_gte(comp_algo + " compressed entropy better than advertised",
compressed.size() * 8, bits);
}
catch(std::exception& e)
{
result.test_failure(comp_algo + " exception while compressing", e.what());
}
SeedCapturing_RNG rng2;
size_t bits2 = srcs.poll_just(rng2, src_name);
result.test_note("poll 2 result", rng2.seed_material());
try
{
Botan::secure_vector<uint8_t> compressed;
compressed.insert(compressed.end(), rng.seed_material().begin(), rng.seed_material().end());
compressed.insert(compressed.end(), rng2.seed_material().begin(), rng2.seed_material().end());
comp->start();
comp->finish(compressed);
size_t comp2_size = compressed.size();
result.test_lt("Two blocks of entropy are larger than one",
comp1_size, comp2_size);
size_t comp_diff = comp2_size - comp1_size;
result.test_gte(comp_algo + " diff compressed entropy better than advertised",
comp_diff * 8, bits2);
}
catch(std::exception& e)
{
result.test_failure(comp_algo + " exception while compressing", e.what());
}
}
}
}
#endif
}
catch(std::exception& e)
{
result.test_failure("during entropy collection test", e.what());
}
result.end_timer();
results.push_back(result);
}
return results;
}
};
BOTAN_REGISTER_TEST("entropy", Entropy_Source_Tests);
}
}
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