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/*
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "tests.h"
#if defined(BOTAN_HAS_NEWHOPE) && defined(BOTAN_HAS_CHACHA)
#include <botan/newhope.h>
#include <botan/hash.h>
#include <botan/stream_cipher.h>
#include <botan/rng.h>
#endif
namespace Botan_Tests {
#if defined(BOTAN_HAS_NEWHOPE) && defined(BOTAN_HAS_CHACHA)
class NEWHOPE_RNG final : public Botan::RandomNumberGenerator
{
public:
std::string name() const override
{
return "NEWHOPE_RNG";
}
void clear() override
{
/* ignored */
}
void randomize(uint8_t out[], size_t len) override
{
if(m_first.size() == len)
{
if(len != 32)
{
throw Test_Error("NEWHOPE_RNG called in unexpected way, bad test?");
}
Botan::copy_mem(out, m_first.data(), m_first.size());
return;
}
/*
* This slavishly emulates the behavior of the reference
* implementations RNG, in order to ensure that from the same
* random seed we compute the exact same result.
*/
Botan::clear_mem(out, len);
m_chacha->cipher1(out, len);
m_calls += 1;
uint8_t nonce[8] = { 0 };
if(m_calls < 3)
{
nonce[0] = m_calls;
}
else
{
nonce[7] = m_calls;
}
m_chacha->set_iv(nonce, 8);
}
bool is_seeded() const override
{
return true;
}
bool accepts_input() const override { return false; }
void add_entropy(const uint8_t /*input*/[], size_t /*length*/) override
{
/* ignored */
}
NEWHOPE_RNG(const std::vector<uint8_t>& seed)
{
m_chacha = Botan::StreamCipher::create_or_throw("ChaCha20");
if(seed.size() != 64 && seed.size() != 32)
{
throw Test_Error("Invalid NEWHOPE RNG seed");
}
if(seed.size() == 64)
{
m_first.assign(seed.begin(), seed.begin() + 32);
m_chacha->set_key(seed.data() + 32, 32);
}
else
{
m_chacha->set_key(seed.data(), 32);
}
}
private:
std::unique_ptr<Botan::StreamCipher> m_chacha;
std::vector<uint8_t> m_first;
uint8_t m_calls = 0;
};
class NEWHOPE_Tests final : public Text_Based_Test
{
public:
NEWHOPE_Tests()
: Text_Based_Test(
"pubkey/newhope.vec",
"DRBG_SeedA,H_OutputA,DRBG_SeedB,H_OutputB,SharedKey") {}
Test::Result run_one_test(const std::string& /*header*/, const VarMap& vars) override
{
Test::Result result("NEWHOPE");
const std::vector<uint8_t> h_output_a = vars.get_req_bin("H_OutputA");
const std::vector<uint8_t> h_output_b = vars.get_req_bin("H_OutputB");
const std::vector<uint8_t> shared_key = vars.get_req_bin("SharedKey");
NEWHOPE_RNG drbg_a(vars.get_req_bin("DRBG_SeedA"));
NEWHOPE_RNG drbg_b(vars.get_req_bin("DRBG_SeedB"));
std::unique_ptr<Botan::HashFunction> sha3 = Botan::HashFunction::create("SHA-3(256)");
std::vector<uint8_t> send_a(Botan::NEWHOPE_SENDABYTES);
Botan::newhope_poly a_sk;
Botan::newhope_keygen(send_a.data(), &a_sk, drbg_a);
std::vector<uint8_t> h_send_a(sha3->output_length());
sha3->update(send_a);
sha3->final(h_send_a.data());
result.test_eq("Hash Output A", h_send_a, h_output_a);
std::vector<uint8_t> sharedkey_b(32);
std::vector<uint8_t> send_b(Botan::NEWHOPE_SENDBBYTES);
Botan::newhope_sharedb(sharedkey_b.data(), send_b.data(), send_a.data(), drbg_b);
result.test_eq("Key B", sharedkey_b, shared_key);
std::vector<uint8_t> h_send_b(sha3->output_length());
sha3->update(send_b);
sha3->final(h_send_b.data());
result.test_eq("Hash Output B", h_send_b, h_output_b);
std::vector<uint8_t> sharedkey_a(32);
newhope_shareda(sharedkey_a.data(), &a_sk, send_b.data());
result.test_eq("Key A", sharedkey_a, shared_key);
return result;
}
};
BOTAN_REGISTER_TEST("pubkey", "newhope", NEWHOPE_Tests);
#endif
}
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