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|
/*
* (C) 2014,2015,2017 Jack Lloyd
* (C) 2016 René Korthaus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "tests.h"
#include "test_rng.h"
#if defined(BOTAN_HAS_HMAC_DRBG)
#include <botan/hmac_drbg.h>
#endif
#if defined(BOTAN_HAS_AUTO_RNG)
#include <botan/auto_rng.h>
#endif
#if defined(BOTAN_HAS_CHACHA_RNG)
#include <botan/chacha_rng.h>
#endif
#if defined(BOTAN_HAS_SYSTEM_RNG)
#include <botan/system_rng.h>
#endif
#if defined(BOTAN_HAS_RDRAND_RNG)
#include <botan/rdrand_rng.h>
#include <botan/cpuid.h>
#endif
#if defined(BOTAN_HAS_ENTROPY_SOURCE)
#include <botan/entropy_src.h>
#endif
#if defined(BOTAN_TARGET_OS_TYPE_IS_UNIX)
#include <unistd.h>
#include <sys/wait.h>
#endif
namespace Botan_Tests {
namespace {
#if defined(BOTAN_HAS_STATEFUL_RNG)
class Stateful_RNG_Tests : public Test
{
public:
std::vector<Test::Result> run() override
{
std::vector<Test::Result> results;
results.push_back(test_reseed_kat());
results.push_back(test_reseed());
results.push_back(test_max_number_of_bytes_per_request());
results.push_back(test_broken_entropy_input());
results.push_back(test_check_nonce());
results.push_back(test_prediction_resistance());
results.push_back(test_fork_safety());
results.push_back(test_randomize_with_ts_input());
results.push_back(test_security_level());
return results;
}
protected:
virtual std::string rng_name() const = 0;
virtual std::unique_ptr<Botan::Stateful_RNG> create_rng(
Botan::RandomNumberGenerator* underlying_rng,
Botan::Entropy_Sources* underlying_es,
size_t reseed_interval) = 0;
std::unique_ptr<Botan::Stateful_RNG> make_rng(Botan::RandomNumberGenerator& underlying_rng,
size_t reseed_interval = 1024)
{
return create_rng(&underlying_rng, nullptr, reseed_interval);
}
std::unique_ptr<Botan::Stateful_RNG> make_rng(Botan::Entropy_Sources& underlying_srcs,
size_t reseed_interval = 1024)
{
return create_rng(nullptr, &underlying_srcs, reseed_interval);
}
std::unique_ptr<Botan::Stateful_RNG> make_rng(Botan::RandomNumberGenerator& underlying_rng,
Botan::Entropy_Sources& underlying_srcs,
size_t reseed_interval = 1024)
{
return create_rng(&underlying_rng, &underlying_srcs, reseed_interval);
}
virtual Test::Result test_reseed_kat() = 0;
virtual Test::Result test_security_level() = 0;
virtual Test::Result test_max_number_of_bytes_per_request() = 0;
private:
Test::Result test_reseed()
{
Test::Result result(rng_name() + " Reseed");
// test reseed_interval is enforced
Request_Counting_RNG counting_rng;
std::unique_ptr<Botan::Stateful_RNG> rng = make_rng(counting_rng, 2);
rng->random_vec(7);
result.test_eq("initial seeding", counting_rng.randomize_count(), 1);
rng->random_vec(9);
result.test_eq("still initial seed", counting_rng.randomize_count(), 1);
rng->random_vec(1);
result.test_eq("first reseed", counting_rng.randomize_count(), 2);
rng->random_vec(15);
result.test_eq("still first reseed", counting_rng.randomize_count(), 2);
rng->random_vec(15);
result.test_eq("second reseed", counting_rng.randomize_count(), 3);
rng->random_vec(1);
result.test_eq("still second reseed", counting_rng.randomize_count(), 3);
if(rng->max_number_of_bytes_per_request() > 0)
{
// request > max_number_of_bytes_per_request, do reseeds occur?
rng->random_vec(64 * 1024 + 1);
result.test_eq("request exceeds output limit", counting_rng.randomize_count(), 4);
rng->random_vec(9 * 64 * 1024 + 1);
result.test_eq("request exceeds output limit", counting_rng.randomize_count(), 9);
}
return result;
}
Test::Result test_broken_entropy_input()
{
Test::Result result(rng_name() + " Broken Entropy Input");
class Broken_Entropy_Source : public Botan::Entropy_Source
{
public:
std::string name() const override
{
return "Broken Entropy Source";
}
size_t poll(Botan::RandomNumberGenerator&) override
{
throw Botan::Exception("polling not available");
}
};
class Insufficient_Entropy_Source : public Botan::Entropy_Source
{
public:
std::string name() const override
{
return "Insufficient Entropy Source";
}
size_t poll(Botan::RandomNumberGenerator&) override
{
return 0;
}
};
// make sure no output is generated when the entropy input source is broken
// underlying_rng throws exception
Botan::Null_RNG broken_entropy_input_rng;
std::unique_ptr<Botan::Stateful_RNG> rng_with_broken_rng = make_rng(broken_entropy_input_rng);
result.test_throws("broken underlying rng", [&rng_with_broken_rng]() { rng_with_broken_rng->random_vec(16); });
// entropy_sources throw exception
std::unique_ptr<Broken_Entropy_Source> broken_entropy_source_1(new Broken_Entropy_Source());
std::unique_ptr<Broken_Entropy_Source> broken_entropy_source_2(new Broken_Entropy_Source());
Botan::Entropy_Sources broken_entropy_sources;
broken_entropy_sources.add_source(std::move(broken_entropy_source_1));
broken_entropy_sources.add_source(std::move(broken_entropy_source_2));
std::unique_ptr<Botan::Stateful_RNG> rng_with_broken_es = make_rng(broken_entropy_sources);
result.test_throws("broken entropy sources", [&rng_with_broken_es]() { rng_with_broken_es->random_vec(16); });
// entropy source returns insufficient entropy
Botan::Entropy_Sources insufficient_entropy_sources;
std::unique_ptr<Insufficient_Entropy_Source> insufficient_entropy_source(new Insufficient_Entropy_Source());
insufficient_entropy_sources.add_source(std::move(insufficient_entropy_source));
std::unique_ptr<Botan::Stateful_RNG> rng_with_insufficient_es = make_rng(insufficient_entropy_sources);
result.test_throws("insufficient entropy source", [&rng_with_insufficient_es]() { rng_with_insufficient_es->random_vec(16); });
// one of or both underlying_rng and entropy_sources throw exception
std::unique_ptr<Botan::Stateful_RNG> rng_with_broken_rng_and_good_es =
make_rng(broken_entropy_input_rng, Botan::Entropy_Sources::global_sources());
result.test_throws("broken underlying rng but good entropy sources", [&rng_with_broken_rng_and_good_es]()
{ rng_with_broken_rng_and_good_es->random_vec(16); });
std::unique_ptr<Botan::Stateful_RNG> rng_with_good_rng_and_broken_es =
make_rng(Test::rng(), broken_entropy_sources);
result.test_throws("good underlying rng but broken entropy sources", [&rng_with_good_rng_and_broken_es]()
{ rng_with_good_rng_and_broken_es->random_vec(16); });
std::unique_ptr<Botan::Stateful_RNG> rng_with_broken_rng_and_broken_es =
make_rng(broken_entropy_input_rng, broken_entropy_sources);
result.test_throws("underlying rng and entropy sources broken", [&rng_with_broken_rng_and_broken_es]()
{ rng_with_broken_rng_and_broken_es->random_vec(16); });
return result;
}
Test::Result test_check_nonce()
{
Test::Result result(rng_name() + " Nonce Check");
// make sure the nonce has at least security_strength bits
std::unique_ptr<Botan::Stateful_RNG> rng = create_rng(nullptr, nullptr, 0);
for(size_t nonce_size : { 0, 4, 8, 16, 31, 32, 34, 64 })
{
rng->clear();
result.test_eq("not seeded", rng->is_seeded(), false);
const std::vector<uint8_t> nonce(nonce_size);
rng->initialize_with(nonce.data(), nonce.size());
if(nonce_size < rng->security_level() / 8)
{
result.test_eq("not seeded", rng->is_seeded(), false);
result.test_throws("invalid nonce size", [&rng]() { rng->random_vec(32); });
}
else
{
result.test_eq("is seeded", rng->is_seeded(), true);
rng->random_vec(32);
}
}
return result;
}
Test::Result test_prediction_resistance()
{
Test::Result result(rng_name() + " Prediction Resistance");
// set reseed_interval = 1, forcing a reseed for every RNG request
Request_Counting_RNG counting_rng;
std::unique_ptr<Botan::Stateful_RNG> rng = make_rng(counting_rng, 1);
rng->random_vec(16);
result.test_eq("first request", counting_rng.randomize_count(), size_t(1));
rng->random_vec(16);
result.test_eq("second request", counting_rng.randomize_count(), size_t(2));
rng->random_vec(16);
result.test_eq("third request", counting_rng.randomize_count(), size_t(3));
return result;
}
Test::Result test_fork_safety()
{
Test::Result result(rng_name() + " Fork Safety");
#if defined(BOTAN_TARGET_OS_TYPE_IS_UNIX)
const size_t reseed_interval = 1024;
// make sure rng is reseeded after every fork
Request_Counting_RNG counting_rng;
std::unique_ptr<Botan::Stateful_RNG> rng = make_rng(counting_rng, reseed_interval);
rng->random_vec(16);
result.test_eq("first request", counting_rng.randomize_count(), size_t(1));
// fork and request from parent and child, both should output different sequences
size_t count = counting_rng.randomize_count();
Botan::secure_vector<uint8_t> parent_bytes(16), child_bytes(16);
int fd[2];
int rc = ::pipe(fd);
if(rc != 0)
{
result.test_failure("failed to create pipe");
}
pid_t pid = ::fork();
if(pid == -1)
{
result.test_failure("failed to fork process");
return result;
}
else if(pid != 0)
{
// parent process, wait for randomize_count from child's rng
::close(fd[1]); // close write end in parent
ssize_t got = ::read(fd[0], &count, sizeof(count));
if(got > 0)
{
result.test_eq("expected bytes from child", got, sizeof(count));
result.test_eq("parent not reseeded", counting_rng.randomize_count(), 1);
result.test_eq("child reseed occurred", count, 2);
}
else
{
result.test_failure("Failed to read count size from child process");
}
parent_bytes = rng->random_vec(16);
got = ::read(fd[0], &child_bytes[0], child_bytes.size());
if(got > 0)
{
result.test_eq("expected bytes from child", got, child_bytes.size());
result.test_ne("parent and child output sequences differ", parent_bytes, child_bytes);
}
else
{
result.test_failure("Failed to read RNG bytes from child process");
}
::close(fd[0]); // close read end in parent
// wait for the child to exit
int status = 0;
::waitpid(pid, &status, 0);
}
else
{
// child process, send randomize_count and first output sequence back to parent
::close(fd[0]); // close read end in child
rng->randomize(&child_bytes[0], child_bytes.size());
count = counting_rng.randomize_count();
ssize_t written = ::write(fd[1], &count, sizeof(count));
try
{
rng->randomize(&child_bytes[0], child_bytes.size());
}
catch(std::exception& e)
{
fprintf(stderr, "%s", e.what());
}
written = ::write(fd[1], &child_bytes[0], child_bytes.size());
BOTAN_UNUSED(written);
::close(fd[1]); // close write end in child
::_exit(0);
}
#endif
return result;
}
Test::Result test_randomize_with_ts_input()
{
Test::Result result(rng_name() + " Randomize With Timestamp Input");
const size_t request_bytes = 64;
const std::vector<uint8_t> seed(128);
// check that randomize_with_ts_input() creates different output based on a timestamp
// and possibly additional data, such as process id even with identical seeds
Fixed_Output_RNG fixed_output_rng1(seed);
Fixed_Output_RNG fixed_output_rng2(seed);
std::unique_ptr<Botan::Stateful_RNG> rng1 = make_rng(fixed_output_rng1);
std::unique_ptr<Botan::Stateful_RNG> rng2 = make_rng(fixed_output_rng2);
Botan::secure_vector<uint8_t> output1(request_bytes);
Botan::secure_vector<uint8_t> output2(request_bytes);
rng1->randomize(output1.data(), output1.size());
rng2->randomize(output2.data(), output2.size());
result.test_eq("equal output due to same seed", output1, output2);
rng1->randomize_with_ts_input(output1.data(), output1.size());
rng2->randomize_with_ts_input(output2.data(), output2.size());
result.test_ne("output differs due to different timestamp", output1, output2);
return result;
}
};
#endif
#if defined(BOTAN_HAS_HMAC_DRBG) && defined(BOTAN_HAS_SHA2_32)
class HMAC_DRBG_Unit_Tests : public Stateful_RNG_Tests
{
public:
std::string rng_name() const override { return "HMAC_DRBG"; }
std::unique_ptr<Botan::Stateful_RNG> create_rng(Botan::RandomNumberGenerator* underlying_rng,
Botan::Entropy_Sources* underlying_es,
size_t reseed_interval) override
{
std::unique_ptr<Botan::MessageAuthenticationCode> mac =
Botan::MessageAuthenticationCode::create("HMAC(SHA-256)");
if(underlying_rng && underlying_es)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::HMAC_DRBG(std::move(mac), *underlying_rng, *underlying_es, reseed_interval));
else if(underlying_rng)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::HMAC_DRBG(std::move(mac), *underlying_rng, reseed_interval));
else if(underlying_es)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::HMAC_DRBG(std::move(mac), *underlying_es, reseed_interval));
else if(reseed_interval == 0)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::HMAC_DRBG(std::move(mac)));
else
throw Test_Error("Invalid reseed interval in HMAC_DRBG unit test");
}
Test::Result test_max_number_of_bytes_per_request() override
{
Test::Result result("HMAC_DRBG max_number_of_bytes_per_request");
const std::string mac_string = "HMAC(SHA-256)";
Request_Counting_RNG counting_rng;
result.test_throws("HMAC_DRBG does not accept 0 for max_number_of_bytes_per_request",
[&mac_string, &counting_rng]()
{
Botan::HMAC_DRBG failing_rng(Botan::MessageAuthenticationCode::create(mac_string), counting_rng, 2, 0);
});
result.test_throws("HMAC_DRBG does not accept values higher than 64KB for max_number_of_bytes_per_request",
[&mac_string, &counting_rng]()
{
Botan::HMAC_DRBG failing_rng(Botan::MessageAuthenticationCode::create(mac_string), counting_rng, 2, 64 * 1024 + 1);
});
// set reseed_interval to 1 so we can test that a long request is split
// into multiple, max_number_of_bytes_per_request long requests
// for each smaller request, reseed_check() calls counting_rng::randomize(),
// which we can compare with
Botan::HMAC_DRBG rng(Botan::MessageAuthenticationCode::create(mac_string), counting_rng, 1, 64);
rng.random_vec(63);
result.test_eq("one request", counting_rng.randomize_count(), 1);
rng.clear();
counting_rng.clear();
rng.random_vec(64);
result.test_eq("one request", counting_rng.randomize_count(), 1);
rng.clear();
counting_rng.clear();
rng.random_vec(65);
result.test_eq("two requests", counting_rng.randomize_count(), 2);
rng.clear();
counting_rng.clear();
rng.random_vec(1025);
result.test_eq("17 requests", counting_rng.randomize_count(), 17);
return result;
}
Test::Result test_security_level() override
{
Test::Result result("HMAC_DRBG Security Level");
std::vector<std::string> approved_hash_fns { "SHA-160", "SHA-224", "SHA-256", "SHA-512/256", "SHA-384", "SHA-512" };
std::vector<uint32_t> security_strengths { 128, 192, 256, 256, 256, 256 };
for(size_t i = 0; i < approved_hash_fns.size(); ++i)
{
std::string hash_fn = approved_hash_fns[i];
std::string mac_name = "HMAC(" + hash_fn + ")";
auto mac = Botan::MessageAuthenticationCode::create(mac_name);
if(!mac)
{
result.note_missing(mac_name);
continue;
}
Botan::HMAC_DRBG rng(std::move(mac));
result.test_eq(hash_fn + " security level", rng.security_level(), security_strengths[i]);
}
return result;
}
Test::Result test_reseed_kat() override
{
Test::Result result("HMAC_DRBG Reseed KAT");
Request_Counting_RNG counting_rng;
std::unique_ptr<Botan::Stateful_RNG> rng = make_rng(counting_rng, 2);
const Botan::secure_vector<uint8_t> seed_input(
{
0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF,
0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF
});
result.test_eq("is_seeded", rng->is_seeded(), false);
rng->initialize_with(seed_input.data(), seed_input.size());
Botan::secure_vector<uint8_t> out(32);
rng->randomize(out.data(), out.size());
result.test_eq("underlying RNG calls", counting_rng.randomize_count(), size_t(0));
result.test_eq("out before reseed", out, "48D3B45AAB65EF92CCFCB9427EF20C90297065ECC1B8A525BFE4DC6FF36D0E38");
// reseed must happen here
rng->randomize(out.data(), out.size());
result.test_eq("underlying RNG calls", counting_rng.randomize_count(), size_t(1));
result.test_eq("out after reseed", out, "2F8FCA696832C984781123FD64F4B20C7379A25C87AB29A21C9BF468B0081CE2");
return result;
}
};
BOTAN_REGISTER_TEST("hmac_drbg_unit", HMAC_DRBG_Unit_Tests);
#endif
#if defined(BOTAN_HAS_CHACHA_RNG)
class ChaCha_RNG_Unit_Tests : public Stateful_RNG_Tests
{
public:
std::string rng_name() const override { return "ChaCha_RNG"; }
std::unique_ptr<Botan::Stateful_RNG> create_rng(Botan::RandomNumberGenerator* underlying_rng,
Botan::Entropy_Sources* underlying_es,
size_t reseed_interval) override
{
if(underlying_rng && underlying_es)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::ChaCha_RNG(*underlying_rng, *underlying_es, reseed_interval));
else if(underlying_rng)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::ChaCha_RNG(*underlying_rng, reseed_interval));
else if(underlying_es)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::ChaCha_RNG(*underlying_es, reseed_interval));
else if(reseed_interval == 0)
return std::unique_ptr<Botan::Stateful_RNG>(new Botan::ChaCha_RNG());
else
throw Test_Error("Invalid reseed interval in ChaCha_RNG unit test");
}
Test::Result test_security_level() override
{
Test::Result result("ChaCha_RNG Security Level");
Botan::ChaCha_RNG rng;
result.test_eq("Expected security level", rng.security_level(), size_t(256));
return result;
}
Test::Result test_max_number_of_bytes_per_request() override
{
Test::Result result("ChaCha_RNG max_number_of_bytes_per_request");
// ChaCha_RNG doesn't have this notion
return result;
}
Test::Result test_reseed_kat() override
{
Test::Result result("ChaCha_RNG Reseed KAT");
Request_Counting_RNG counting_rng;
std::unique_ptr<Botan::Stateful_RNG> rng = make_rng(counting_rng, 2);
const Botan::secure_vector<uint8_t> seed_input(32);
result.test_eq("is_seeded", rng->is_seeded(), false);
rng->initialize_with(seed_input.data(), seed_input.size());
Botan::secure_vector<uint8_t> out(32);
rng->randomize(out.data(), out.size());
result.test_eq("underlying RNG calls", counting_rng.randomize_count(), size_t(0));
result.test_eq("out before reseed", out, "1F0E6F13429D5073B59C057C37CBE9587740A0A894D247E2596C393CE91DDC6F");
// reseed must happen here
rng->randomize(out.data(), out.size());
result.test_eq("underlying RNG calls", counting_rng.randomize_count(), size_t(1));
result.test_eq("out after reseed", out, "F2CAE73F22684D5D773290B48FDCDA0E6C0661EBA0A854AFEC922832BDBB9C49");
return result;
}
};
BOTAN_REGISTER_TEST("chacha_rng_unit", ChaCha_RNG_Unit_Tests);
#endif
#if defined(BOTAN_HAS_AUTO_RNG)
class AutoSeeded_RNG_Tests : public Test
{
private:
Test::Result auto_rng_tests()
{
Test::Result result("AutoSeeded_RNG");
Botan::Entropy_Sources no_entropy_for_you;
Botan::Null_RNG null_rng;
result.test_eq("Null_RNG is null", null_rng.is_seeded(), false);
try
{
Botan::AutoSeeded_RNG rng(no_entropy_for_you);
result.test_failure("AutoSeeded_RNG should have rejected useless entropy source");
}
catch(Botan::PRNG_Unseeded&)
{
result.test_success("AutoSeeded_RNG rejected empty entropy source");
}
try
{
Botan::AutoSeeded_RNG rng(null_rng);
}
catch(Botan::PRNG_Unseeded&)
{
result.test_success("AutoSeeded_RNG rejected useless RNG");
}
try
{
Botan::AutoSeeded_RNG rng(null_rng,
no_entropy_for_you);
}
catch(Botan::PRNG_Unseeded&)
{
result.test_success("AutoSeeded_RNG rejected useless RNG+entropy sources");
}
Botan::AutoSeeded_RNG rng;
result.test_eq("AutoSeeded_RNG::name", rng.name(),
std::string("HMAC_DRBG(") + BOTAN_AUTO_RNG_HMAC + ")");
result.confirm("AutoSeeded_RNG starts seeded", rng.is_seeded());
rng.random_vec(16); // generate and discard output
rng.clear();
result.test_eq("AutoSeeded_RNG unseeded after calling clear", rng.is_seeded(), false);
// AutoSeeded_RNG automatically reseeds as required:
rng.random_vec(16);
result.confirm("AutoSeeded_RNG can be reseeded", rng.is_seeded());
result.confirm("AutoSeeded_RNG ", rng.is_seeded());
rng.random_vec(16); // generate and discard output
rng.clear();
result.test_eq("AutoSeeded_RNG unseeded after calling clear", rng.is_seeded(), false);
const size_t no_entropy_bits = rng.reseed(no_entropy_for_you, 256, std::chrono::milliseconds(300));
result.test_eq("AutoSeeded_RNG can't reseed from nothing", no_entropy_bits, 0);
result.test_eq("AutoSeeded_RNG still unseeded", rng.is_seeded(), false);
rng.random_vec(16); // generate and discard output
result.confirm("AutoSeeded_RNG can be reseeded", rng.is_seeded());
rng.clear();
return result;
}
public:
std::vector<Test::Result> run() override
{
std::vector<Test::Result> results;
results.push_back(auto_rng_tests());
return results;
}
};
BOTAN_REGISTER_TEST("auto_rng_unit", AutoSeeded_RNG_Tests);
#endif
#if defined(BOTAN_HAS_SYSTEM_RNG)
class System_RNG_Tests : public Test
{
public:
std::vector<Test::Result> run() override
{
Test::Result result("System_RNG");
Botan::System_RNG rng;
const std::string name = rng.name();
result.confirm("Some non-empty name is returned", name.empty() == false);
result.confirm("System RNG always seeded", rng.is_seeded());
rng.clear(); // clear is a noop for system rng
result.confirm("System RNG always seeded", rng.is_seeded());
rng.reseed(Botan::Entropy_Sources::global_sources(),
256,
std::chrono::milliseconds(100));
for(size_t i = 0; i != 128; ++i)
{
std::vector<uint8_t> out_buf(i);
rng.randomize(out_buf.data(), out_buf.size());
}
return std::vector<Test::Result>{result};
}
};
BOTAN_REGISTER_TEST("system_rng", System_RNG_Tests);
#endif
#if defined(BOTAN_HAS_RDRAND_RNG)
class RDRAND_RNG_Tests : public Test
{
public:
std::vector<Test::Result> run() override
{
Test::Result result("RDRAND_RNG");
if(Botan::CPUID::has_rdrand())
{
Botan::RDRAND_RNG rng;
result.test_eq("Expected name", rng.name(), "RDRAND");
result.confirm("RDRAND always seeded", rng.is_seeded());
rng.clear(); // clear is a noop for rdrand
result.confirm("RDRAND always seeded", rng.is_seeded());
size_t reseed_bits = rng.reseed(Botan::Entropy_Sources::global_sources(),
256,
std::chrono::seconds(1));
result.test_eq("RDRAND cannot consume inputs", reseed_bits, size_t(0));
/*
RDRAND_RNG ignores add_entropy calls - confirm this by passing
an invalid ptr/length field to add_entropy. If it examined its
arguments, it would crash...
*/
const uint8_t* invalid_ptr = reinterpret_cast<const uint8_t*>(0xDEADC0DE);
const size_t invalid_ptr_len = 64*1024;
rng.add_entropy(invalid_ptr, invalid_ptr_len);
for(size_t i = 0; i != 128; ++i)
{
std::vector<uint8_t> out_buf(i);
rng.randomize(out_buf.data(), out_buf.size());
}
}
else
{
result.test_throws("RDRAND_RNG throws if instruction not available",
[]() { Botan::RDRAND_RNG rng; });
}
return std::vector<Test::Result>{result};
}
};
BOTAN_REGISTER_TEST("rdrand_rng", RDRAND_RNG_Tests);
#endif
}
}
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