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#include "tests.h"
#include "test_rng.h"
#include <botan/libstate.h>
#include <botan/hex.h>
#include <iostream>
#include <fstream>
#if defined(BOTAN_HAS_HMAC_DRBG)
#include <botan/hmac_drbg.h>
#endif
#if defined(BOTAN_HAS_X931_RNG)
#include <botan/x931_rng.h>
#endif
using namespace Botan;
namespace {
RandomNumberGenerator* get_rng(const std::string& algo_str, const std::string& ikm_hex)
{
class AllOnce_RNG : public Fixed_Output_RNG
{
public:
AllOnce_RNG(const std::vector<byte>& in) : Fixed_Output_RNG(in) {}
Botan::secure_vector<byte> random_vec(size_t)
{
Botan::secure_vector<byte> vec(this->remaining());
this->randomize(&vec[0], vec.size());
return vec;
}
};
const auto ikm = hex_decode(ikm_hex);
Algorithm_Factory& af = global_state().algorithm_factory();
const auto algo_name = parse_algorithm_name(algo_str);
const std::string rng_name = algo_name[0];
#if defined(BOTAN_HAS_HMAC_DRBG)
if(rng_name == "HMAC_DRBG")
return new HMAC_DRBG(af.make_mac("HMAC(" + algo_name[1] + ")"),
new AllOnce_RNG(ikm));
#endif
#if defined(BOTAN_HAS_X931_RNG)
if(rng_name == "X9.31-RNG")
return new ANSI_X931_RNG(af.make_block_cipher(algo_name[1]),
new Fixed_Output_RNG(ikm));
#endif
return nullptr;
}
size_t x931_test(const std::string& algo,
const std::string& ikm,
const std::string& out,
size_t L)
{
std::unique_ptr<RandomNumberGenerator> rng(get_rng(algo, ikm));
if(!rng)
throw std::runtime_error("Unknown RNG " + algo);
const std::string got = hex_encode(rng->random_vec(L));
if(got != out)
{
std::cout << "X9.31 " << got << " != " << out << "\n";
return 1;
}
return 0;
}
size_t hmac_drbg_test(std::map<std::string, std::string> m)
{
const std::string algo = m["RNG"];
const std::string ikm = m["EntropyInput"];
std::unique_ptr<RandomNumberGenerator> rng(get_rng(algo, ikm));
if(!rng)
throw std::runtime_error("Unknown RNG " + algo);
rng->reseed(0); // force initialization
// now reseed
const auto reseed_input = hex_decode(m["EntropyInputReseed"]);
rng->add_entropy(&reseed_input[0], reseed_input.size());
const std::string out = m["Out"];
const size_t out_len = out.size() / 2;
rng->random_vec(out_len); // gen 1st block (discarded)
const std::string got = hex_encode(rng->random_vec(out_len));
if(got != out)
{
std::cout << algo << " " << got << " != " << out << "\n";
return 1;
}
return 0;
}
}
size_t test_rngs()
{
std::ifstream hmac_drbg_vec(TEST_DATA_DIR "/hmac_drbg.vec");
std::ifstream x931_vec(TEST_DATA_DIR "/x931.vec");
size_t fails = 0;
fails += run_tests_bb(hmac_drbg_vec, "RNG", "Out", true, hmac_drbg_test);
fails += run_tests_bb(x931_vec, "RNG", "Out", true,
[](std::map<std::string, std::string> m) -> size_t
{
return x931_test(m["RNG"], m["IKM"], m["Out"], to_u32bit(m["L"]));
});
return fails;
}
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