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/*
* (C) 2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "tests.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
{
static const size_t MAX_ENTROPY = 512;
static const size_t MAX_SAMPLES = 256;
static const size_t MAX_ENTROPY_BYTES = 256*1024;
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&& src_name : src_names)
{
Test::Result result("Entropy source " + src_name);
result.start_timer();
try
{
std::vector<uint8_t> entropy;
size_t samples = 0;
size_t entropy_estimate = 0;
Botan::Entropy_Accumulator accum(
[&](const uint8_t buf[], size_t buf_len, size_t buf_entropy) -> bool {
entropy.insert(entropy.end(), buf, buf + buf_len);
entropy_estimate += buf_entropy;
++samples;
result.test_note("sample " + std::to_string(samples) + " " +
Botan::hex_encode(buf, buf_len) + " " + std::to_string(buf_entropy));
result.test_gte("impossible entropy", buf_len * 8, buf_entropy);
return (entropy_estimate > MAX_ENTROPY ||
samples > MAX_SAMPLES ||
entropy.size() > MAX_ENTROPY_BYTES);
});
result.confirm("polled source", srcs.poll_just(accum, src_name));
result.test_note("saw " + std::to_string(samples) +
" samples with total estimated entropy " +
std::to_string(entropy_estimate));
result.test_note("poll result", entropy);
#if defined(BOTAN_HAS_COMPRESSION)
if(!entropy.empty())
{
for(const std::string comp_algo : { "zlib", "bzip2", "lzma" })
{
std::unique_ptr<Botan::Compressor_Transform> comp(Botan::make_compressor(comp_algo, 9));
if(comp)
{
size_t comp1_size = 0;
try
{
Botan::secure_vector<byte> compressed;
compressed.assign(entropy.begin(), entropy.end());
comp->start();
comp->finish(compressed);
comp1_size = compressed.size();
result.test_gte(comp_algo + " compressed entropy better than advertised",
compressed.size() * 8, entropy_estimate);
}
catch(std::exception& e)
{
result.test_failure(comp_algo + " exception while compressing", e.what());
}
std::vector<uint8_t> entropy2;
size_t entropy_estimate2 = 0;
Botan::Entropy_Accumulator accum2(
[&](const uint8_t buf[], size_t buf_len, size_t buf_entropy) -> bool {
entropy2.insert(entropy2.end(), buf, buf + buf_len);
entropy_estimate2 += buf_entropy;
return entropy2.size() >= entropy.size();
});
result.confirm("polled source", srcs.poll_just(accum2, src_name));
result.test_note("poll 2 result", entropy2);
try
{
Botan::secure_vector<byte> compressed;
compressed.insert(compressed.end(), entropy.begin(), entropy.end());
compressed.insert(compressed.end(), entropy2.begin(), entropy2.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, entropy_estimate2);
}
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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