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/*
* (C) 2009 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "tests.h"
#if defined(BOTAN_HAS_THRESHOLD_SECRET_SHARING)
#include <botan/tss.h>
#include "test_rng.h"
#endif
namespace Botan_Tests {
namespace {
#if defined(BOTAN_HAS_THRESHOLD_SECRET_SHARING)
class TSS_Recovery_Tests final : public Text_Based_Test
{
public:
TSS_Recovery_Tests() : Text_Based_Test("tss/recovery.vec", "N,M,Shares,Recovered") {}
Test::Result run_one_test(const std::string& header, const VarMap& vars) override
{
Test::Result result("TSS");
const std::vector<uint8_t> input = vars.get_req_bin("Recovered");
const size_t N = vars.get_req_sz("N");
const size_t M = vars.get_req_sz("M");
const std::vector<std::vector<uint8_t>> expected_shares = vars.get_req_bin_list("Shares");
try
{
std::vector<Botan::RTSS_Share> shares;
for(auto&& v : expected_shares)
{
shares.push_back(Botan::RTSS_Share(v.data(), v.size()));
}
auto reconstructed_secret_all = Botan::RTSS_Share::reconstruct(shares);
result.test_eq("Reconstructed secret correctly from all shares", reconstructed_secret_all, input);
if(header == "Invalid")
result.test_failure("Invalid shares should not result in recovery");
if(N != M)
{
while(shares.size() > M)
{
size_t to_remove = Test::rng().next_byte() % shares.size();
shares.erase(shares.begin() + to_remove);
try
{
auto reconstructed_secret = Botan::RTSS_Share::reconstruct(shares);
result.test_eq("Reconstructed secret correctly from reduced shares", reconstructed_secret, input);
}
catch(Botan::Decoding_Error& e)
{
result.test_failure("Reconstruction failed with share count " + std::to_string(shares.size()));
}
}
}
}
catch(std::exception& e)
{
if(header == "Valid")
result.test_failure("Valid TSS failed to recover", e.what());
else
result.test_success("Invalid TSS rejected as expected");
}
return result;
}
};
BOTAN_REGISTER_TEST("tss_recovery", TSS_Recovery_Tests);
class TSS_Generation_Tests final : public Text_Based_Test
{
public:
TSS_Generation_Tests() : Text_Based_Test("tss/generation.vec", "Input,RNG,Hash,Id,N,M,Shares") {}
static size_t tss_hash_len(const std::string& hash)
{
if(hash == "None")
return 0;
else if(hash == "SHA-1")
return 20;
else if(hash == "SHA-256")
return 32;
else
throw Test_Error("Unknown TSS hash algorithm " + hash);
}
Test::Result run_one_test(const std::string&, const VarMap& vars) override
{
Test::Result result("TSS");
const std::vector<uint8_t> input = vars.get_req_bin("Input");
const std::vector<uint8_t> id = vars.get_req_bin("Id");
const std::vector<uint8_t> rng_data = vars.get_req_bin("RNG");
const size_t N = vars.get_req_sz("N");
const size_t M = vars.get_req_sz("M");
const std::string hash = vars.get_req_str("Hash");
const std::vector<std::vector<uint8_t>> expected_shares = vars.get_req_bin_list("Shares");
if(expected_shares.size() != N)
throw Test_Error("Invalid test data for TSS share count != N");
if(rng_data.size() != (input.size() + tss_hash_len(hash)) * (M-1))
throw Test_Error("Invalid test data for TSS share bad RNG input size");
Fixed_Output_RNG fixed_rng(rng_data);
std::vector<Botan::RTSS_Share> shares =
Botan::RTSS_Share::split(M, N, input.data(), input.size(), id, hash, fixed_rng);
result.test_eq("Expected number of shares", shares.size(), N);
for(size_t i = 0; i != N; ++i)
{
result.test_eq("Expected share", shares[i].data(), expected_shares[i]);
}
auto reconstructed_secret_all = Botan::RTSS_Share::reconstruct(shares);
result.test_eq("Reconstructed secret correctly from all shares", reconstructed_secret_all, input);
if(N != M)
{
while(shares.size() > M)
{
size_t to_remove = Test::rng().next_byte() % shares.size();
shares.erase(shares.begin() + to_remove);
try
{
auto reconstructed_secret = Botan::RTSS_Share::reconstruct(shares);
result.test_eq("Reconstructed secret correctly from reduced shares", reconstructed_secret, input);
}
catch(Botan::Decoding_Error&)
{
result.test_failure("Reconstruction failed with share count " + std::to_string(shares.size()));
}
}
}
return result;
}
};
BOTAN_REGISTER_TEST("tss_generation", TSS_Generation_Tests);
#endif // BOTAN_HAS_THRESHOLD_SECRET_SHARING
}
}
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