1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* (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&)
{
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 uint8_t N = vars.get_req_u8("N");
const uint8_t M = vars.get_req_u8("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(), static_cast<uint16_t>(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
}
}
|
