1 // Copyright (c) 2012-2020 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #include <key.h>
6 
7 #include <key_io.h>
8 #include <streams.h>
9 #include <test/util/setup_common.h>
10 #include <uint256.h>
11 #include <util/strencodings.h>
12 #include <util/string.h>
13 #include <util/system.h>
14 
15 #include <string>
16 #include <vector>
17 
18 #include <boost/test/unit_test.hpp>
19 
20 static const std::string strSecret1 = "5HxWvvfubhXpYYpS3tJkw6fq9jE9j18THftkZjHHfmFiWtmAbrj";
21 static const std::string strSecret2 = "5KC4ejrDjv152FGwP386VD1i2NYc5KkfSMyv1nGy1VGDxGHqVY3";
22 static const std::string strSecret1C = "Kwr371tjA9u2rFSMZjTNun2PXXP3WPZu2afRHTcta6KxEUdm1vEw";
23 static const std::string strSecret2C = "L3Hq7a8FEQwJkW1M2GNKDW28546Vp5miewcCzSqUD9kCAXrJdS3g";
24 static const std::string addr1 = "1QFqqMUD55ZV3PJEJZtaKCsQmjLT6JkjvJ";
25 static const std::string addr2 = "1F5y5E5FMc5YzdJtB9hLaUe43GDxEKXENJ";
26 static const std::string addr1C = "1NoJrossxPBKfCHuJXT4HadJrXRE9Fxiqs";
27 static const std::string addr2C = "1CRj2HyM1CXWzHAXLQtiGLyggNT9WQqsDs";
28 
29 static const std::string strAddressBad = "1HV9Lc3sNHZxwj4Zk6fB38tEmBryq2cBiF";
30 
31 
32 BOOST_FIXTURE_TEST_SUITE(key_tests, BasicTestingSetup)
33 
34 BOOST_AUTO_TEST_CASE(key_test1)
35 {
36     CKey key1  = DecodeSecret(strSecret1);
37     BOOST_CHECK(key1.IsValid() && !key1.IsCompressed());
38     CKey key2  = DecodeSecret(strSecret2);
39     BOOST_CHECK(key2.IsValid() && !key2.IsCompressed());
40     CKey key1C = DecodeSecret(strSecret1C);
41     BOOST_CHECK(key1C.IsValid() && key1C.IsCompressed());
42     CKey key2C = DecodeSecret(strSecret2C);
43     BOOST_CHECK(key2C.IsValid() && key2C.IsCompressed());
44     CKey bad_key = DecodeSecret(strAddressBad);
45     BOOST_CHECK(!bad_key.IsValid());
46 
47     CPubKey pubkey1  = key1. GetPubKey();
48     CPubKey pubkey2  = key2. GetPubKey();
49     CPubKey pubkey1C = key1C.GetPubKey();
50     CPubKey pubkey2C = key2C.GetPubKey();
51 
52     BOOST_CHECK(key1.VerifyPubKey(pubkey1));
53     BOOST_CHECK(!key1.VerifyPubKey(pubkey1C));
54     BOOST_CHECK(!key1.VerifyPubKey(pubkey2));
55     BOOST_CHECK(!key1.VerifyPubKey(pubkey2C));
56 
57     BOOST_CHECK(!key1C.VerifyPubKey(pubkey1));
58     BOOST_CHECK(key1C.VerifyPubKey(pubkey1C));
59     BOOST_CHECK(!key1C.VerifyPubKey(pubkey2));
60     BOOST_CHECK(!key1C.VerifyPubKey(pubkey2C));
61 
62     BOOST_CHECK(!key2.VerifyPubKey(pubkey1));
63     BOOST_CHECK(!key2.VerifyPubKey(pubkey1C));
64     BOOST_CHECK(key2.VerifyPubKey(pubkey2));
65     BOOST_CHECK(!key2.VerifyPubKey(pubkey2C));
66 
67     BOOST_CHECK(!key2C.VerifyPubKey(pubkey1));
68     BOOST_CHECK(!key2C.VerifyPubKey(pubkey1C));
69     BOOST_CHECK(!key2C.VerifyPubKey(pubkey2));
70     BOOST_CHECK(key2C.VerifyPubKey(pubkey2C));
71 
72     BOOST_CHECK(DecodeDestination(addr1)  == CTxDestination(PKHash(pubkey1)));
73     BOOST_CHECK(DecodeDestination(addr2)  == CTxDestination(PKHash(pubkey2)));
74     BOOST_CHECK(DecodeDestination(addr1C) == CTxDestination(PKHash(pubkey1C)));
75     BOOST_CHECK(DecodeDestination(addr2C) == CTxDestination(PKHash(pubkey2C)));
76 
77     for (int n=0; n<16; n++)
78     {
79         std::string strMsg = strprintf("Very secret message %i: 11", n);
80         uint256 hashMsg = Hash(strMsg);
81 
82         // normal signatures
83 
84         std::vector<unsigned char> sign1, sign2, sign1C, sign2C;
85 
86         BOOST_CHECK(key1.Sign (hashMsg, sign1));
87         BOOST_CHECK(key2.Sign (hashMsg, sign2));
88         BOOST_CHECK(key1C.Sign(hashMsg, sign1C));
89         BOOST_CHECK(key2C.Sign(hashMsg, sign2C));
90 
91         BOOST_CHECK( pubkey1.Verify(hashMsg, sign1));
92         BOOST_CHECK(!pubkey1.Verify(hashMsg, sign2));
93         BOOST_CHECK( pubkey1.Verify(hashMsg, sign1C));
94         BOOST_CHECK(!pubkey1.Verify(hashMsg, sign2C));
95 
96         BOOST_CHECK(!pubkey2.Verify(hashMsg, sign1));
97         BOOST_CHECK( pubkey2.Verify(hashMsg, sign2));
98         BOOST_CHECK(!pubkey2.Verify(hashMsg, sign1C));
99         BOOST_CHECK( pubkey2.Verify(hashMsg, sign2C));
100 
101         BOOST_CHECK( pubkey1C.Verify(hashMsg, sign1));
102         BOOST_CHECK(!pubkey1C.Verify(hashMsg, sign2));
103         BOOST_CHECK( pubkey1C.Verify(hashMsg, sign1C));
104         BOOST_CHECK(!pubkey1C.Verify(hashMsg, sign2C));
105 
106         BOOST_CHECK(!pubkey2C.Verify(hashMsg, sign1));
107         BOOST_CHECK( pubkey2C.Verify(hashMsg, sign2));
108         BOOST_CHECK(!pubkey2C.Verify(hashMsg, sign1C));
109         BOOST_CHECK( pubkey2C.Verify(hashMsg, sign2C));
110 
111         // compact signatures (with key recovery)
112 
113         std::vector<unsigned char> csign1, csign2, csign1C, csign2C;
114 
115         BOOST_CHECK(key1.SignCompact (hashMsg, csign1));
116         BOOST_CHECK(key2.SignCompact (hashMsg, csign2));
117         BOOST_CHECK(key1C.SignCompact(hashMsg, csign1C));
118         BOOST_CHECK(key2C.SignCompact(hashMsg, csign2C));
119 
120         CPubKey rkey1, rkey2, rkey1C, rkey2C;
121 
122         BOOST_CHECK(rkey1.RecoverCompact (hashMsg, csign1));
123         BOOST_CHECK(rkey2.RecoverCompact (hashMsg, csign2));
124         BOOST_CHECK(rkey1C.RecoverCompact(hashMsg, csign1C));
125         BOOST_CHECK(rkey2C.RecoverCompact(hashMsg, csign2C));
126 
127         BOOST_CHECK(rkey1  == pubkey1);
128         BOOST_CHECK(rkey2  == pubkey2);
129         BOOST_CHECK(rkey1C == pubkey1C);
130         BOOST_CHECK(rkey2C == pubkey2C);
131     }
132 
133     // test deterministic signing
134 
135     std::vector<unsigned char> detsig, detsigc;
136     std::string strMsg = "Very deterministic message";
137     uint256 hashMsg = Hash(strMsg);
138     BOOST_CHECK(key1.Sign(hashMsg, detsig));
139     BOOST_CHECK(key1C.Sign(hashMsg, detsigc));
140     BOOST_CHECK(detsig == detsigc);
141     BOOST_CHECK(detsig == ParseHex("304402205dbbddda71772d95ce91cd2d14b592cfbc1dd0aabd6a394b6c2d377bbe59d31d022014ddda21494a4e221f0824f0b8b924c43fa43c0ad57dccdaa11f81a6bd4582f6"));
142     BOOST_CHECK(key2.Sign(hashMsg, detsig));
143     BOOST_CHECK(key2C.Sign(hashMsg, detsigc));
144     BOOST_CHECK(detsig == detsigc);
145     BOOST_CHECK(detsig == ParseHex("3044022052d8a32079c11e79db95af63bb9600c5b04f21a9ca33dc129c2bfa8ac9dc1cd5022061d8ae5e0f6c1a16bde3719c64c2fd70e404b6428ab9a69566962e8771b5944d"));
146     BOOST_CHECK(key1.SignCompact(hashMsg, detsig));
147     BOOST_CHECK(key1C.SignCompact(hashMsg, detsigc));
148     BOOST_CHECK(detsig == ParseHex("1c5dbbddda71772d95ce91cd2d14b592cfbc1dd0aabd6a394b6c2d377bbe59d31d14ddda21494a4e221f0824f0b8b924c43fa43c0ad57dccdaa11f81a6bd4582f6"));
149     BOOST_CHECK(detsigc == ParseHex("205dbbddda71772d95ce91cd2d14b592cfbc1dd0aabd6a394b6c2d377bbe59d31d14ddda21494a4e221f0824f0b8b924c43fa43c0ad57dccdaa11f81a6bd4582f6"));
150     BOOST_CHECK(key2.SignCompact(hashMsg, detsig));
151     BOOST_CHECK(key2C.SignCompact(hashMsg, detsigc));
152     BOOST_CHECK(detsig == ParseHex("1c52d8a32079c11e79db95af63bb9600c5b04f21a9ca33dc129c2bfa8ac9dc1cd561d8ae5e0f6c1a16bde3719c64c2fd70e404b6428ab9a69566962e8771b5944d"));
153     BOOST_CHECK(detsigc == ParseHex("2052d8a32079c11e79db95af63bb9600c5b04f21a9ca33dc129c2bfa8ac9dc1cd561d8ae5e0f6c1a16bde3719c64c2fd70e404b6428ab9a69566962e8771b5944d"));
154 }
155 
156 BOOST_AUTO_TEST_CASE(key_signature_tests)
157 {
158     // When entropy is specified, we should see at least one high R signature within 20 signatures
159     CKey key = DecodeSecret(strSecret1);
160     std::string msg = "A message to be signed";
161     uint256 msg_hash = Hash(msg);
162     std::vector<unsigned char> sig;
163     bool found = false;
164 
165     for (int i = 1; i <=20; ++i) {
166         sig.clear();
167         BOOST_CHECK(key.Sign(msg_hash, sig, false, i));
168         found = sig[3] == 0x21 && sig[4] == 0x00;
169         if (found) {
170             break;
171         }
172     }
173     BOOST_CHECK(found);
174 
175     // When entropy is not specified, we should always see low R signatures that are less than or equal to 70 bytes in 256 tries
176     // The low R signatures should always have the value of their "length of R" byte less than or equal to 32
177     // We should see at least one signature that is less than 70 bytes.
178     bool found_small = false;
179     bool found_big = false;
180     bool bad_sign = false;
181     for (int i = 0; i < 256; ++i) {
182         sig.clear();
183         std::string msg = "A message to be signed" + ToString(i);
184         msg_hash = Hash(msg);
185         if (!key.Sign(msg_hash, sig)) {
186             bad_sign = true;
187             break;
188         }
189         // sig.size() > 70 implies sig[3] > 32, because S is always low.
190         // But check both conditions anyway, just in case this implication is broken for some reason
191         if (sig[3] > 32 || sig.size() > 70) {
192             found_big = true;
193             break;
194         }
195         found_small |= sig.size() < 70;
196     }
197     BOOST_CHECK(!bad_sign);
198     BOOST_CHECK(!found_big);
199     BOOST_CHECK(found_small);
200 }
201 
202 BOOST_AUTO_TEST_CASE(key_key_negation)
203 {
204     // create a dummy hash for signature comparison
205     unsigned char rnd[8];
206     std::string str = "Bitcoin key verification\n";
207     GetRandBytes(rnd, sizeof(rnd));
208     uint256 hash;
209     CHash256().Write(MakeUCharSpan(str)).Write(rnd).Finalize(hash);
210 
211     // import the static test key
212     CKey key = DecodeSecret(strSecret1C);
213 
214     // create a signature
215     std::vector<unsigned char> vch_sig;
216     std::vector<unsigned char> vch_sig_cmp;
217     key.Sign(hash, vch_sig);
218 
219     // negate the key twice
220     BOOST_CHECK(key.GetPubKey().data()[0] == 0x03);
221     key.Negate();
222     // after the first negation, the signature must be different
223     key.Sign(hash, vch_sig_cmp);
224     BOOST_CHECK(vch_sig_cmp != vch_sig);
225     BOOST_CHECK(key.GetPubKey().data()[0] == 0x02);
226     key.Negate();
227     // after the second negation, we should have the original key and thus the
228     // same signature
229     key.Sign(hash, vch_sig_cmp);
230     BOOST_CHECK(vch_sig_cmp == vch_sig);
231     BOOST_CHECK(key.GetPubKey().data()[0] == 0x03);
232 }
233 
234 static CPubKey UnserializePubkey(const std::vector<uint8_t>& data)
235 {
236     CDataStream stream{SER_NETWORK, INIT_PROTO_VERSION};
237     stream << data;
238     CPubKey pubkey;
239     stream >> pubkey;
240     return pubkey;
241 }
242 
243 static unsigned int GetLen(unsigned char chHeader)
244 {
245     if (chHeader == 2 || chHeader == 3)
246         return CPubKey::COMPRESSED_SIZE;
247     if (chHeader == 4 || chHeader == 6 || chHeader == 7)
248         return CPubKey::SIZE;
249     return 0;
250 }
251 
252 static void CmpSerializationPubkey(const CPubKey& pubkey)
253 {
254     CDataStream stream{SER_NETWORK, INIT_PROTO_VERSION};
255     stream << pubkey;
256     CPubKey pubkey2;
257     stream >> pubkey2;
258     BOOST_CHECK(pubkey == pubkey2);
259 }
260 
261 BOOST_AUTO_TEST_CASE(pubkey_unserialize)
262 {
263     for (uint8_t i = 2; i <= 7; ++i) {
264         CPubKey key = UnserializePubkey({0x02});
265         BOOST_CHECK(!key.IsValid());
266         CmpSerializationPubkey(key);
267         key = UnserializePubkey(std::vector<uint8_t>(GetLen(i), i));
268         CmpSerializationPubkey(key);
269         if (i == 5) {
270             BOOST_CHECK(!key.IsValid());
271         } else {
272             BOOST_CHECK(key.IsValid());
273         }
274     }
275 }
276 
277 BOOST_AUTO_TEST_CASE(bip340_test_vectors)
278 {
279     static const std::vector<std::pair<std::array<std::string, 3>, bool>> VECTORS = {
280         {{"F9308A019258C31049344F85F89D5229B531C845836F99B08601F113BCE036F9", "0000000000000000000000000000000000000000000000000000000000000000", "E907831F80848D1069A5371B402410364BDF1C5F8307B0084C55F1CE2DCA821525F66A4A85EA8B71E482A74F382D2CE5EBEEE8FDB2172F477DF4900D310536C0"}, true},
281         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "6896BD60EEAE296DB48A229FF71DFE071BDE413E6D43F917DC8DCF8C78DE33418906D11AC976ABCCB20B091292BFF4EA897EFCB639EA871CFA95F6DE339E4B0A"}, true},
282         {{"DD308AFEC5777E13121FA72B9CC1B7CC0139715309B086C960E18FD969774EB8", "7E2D58D8B3BCDF1ABADEC7829054F90DDA9805AAB56C77333024B9D0A508B75C", "5831AAEED7B44BB74E5EAB94BA9D4294C49BCF2A60728D8B4C200F50DD313C1BAB745879A5AD954A72C45A91C3A51D3C7ADEA98D82F8481E0E1E03674A6F3FB7"}, true},
283         {{"25D1DFF95105F5253C4022F628A996AD3A0D95FBF21D468A1B33F8C160D8F517", "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", "7EB0509757E246F19449885651611CB965ECC1A187DD51B64FDA1EDC9637D5EC97582B9CB13DB3933705B32BA982AF5AF25FD78881EBB32771FC5922EFC66EA3"}, true},
284         {{"D69C3509BB99E412E68B0FE8544E72837DFA30746D8BE2AA65975F29D22DC7B9", "4DF3C3F68FCC83B27E9D42C90431A72499F17875C81A599B566C9889B9696703", "00000000000000000000003B78CE563F89A0ED9414F5AA28AD0D96D6795F9C6376AFB1548AF603B3EB45C9F8207DEE1060CB71C04E80F593060B07D28308D7F4"}, true},
285         {{"EEFDEA4CDB677750A420FEE807EACF21EB9898AE79B9768766E4FAA04A2D4A34", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "6CFF5C3BA86C69EA4B7376F31A9BCB4F74C1976089B2D9963DA2E5543E17776969E89B4C5564D00349106B8497785DD7D1D713A8AE82B32FA79D5F7FC407D39B"}, false},
286         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "FFF97BD5755EEEA420453A14355235D382F6472F8568A18B2F057A14602975563CC27944640AC607CD107AE10923D9EF7A73C643E166BE5EBEAFA34B1AC553E2"}, false},
287         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "1FA62E331EDBC21C394792D2AB1100A7B432B013DF3F6FF4F99FCB33E0E1515F28890B3EDB6E7189B630448B515CE4F8622A954CFE545735AAEA5134FCCDB2BD"}, false},
288         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "6CFF5C3BA86C69EA4B7376F31A9BCB4F74C1976089B2D9963DA2E5543E177769961764B3AA9B2FFCB6EF947B6887A226E8D7C93E00C5ED0C1834FF0D0C2E6DA6"}, false},
289         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "0000000000000000000000000000000000000000000000000000000000000000123DDA8328AF9C23A94C1FEECFD123BA4FB73476F0D594DCB65C6425BD186051"}, false},
290         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "00000000000000000000000000000000000000000000000000000000000000017615FBAF5AE28864013C099742DEADB4DBA87F11AC6754F93780D5A1837CF197"}, false},
291         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "4A298DACAE57395A15D0795DDBFD1DCB564DA82B0F269BC70A74F8220429BA1D69E89B4C5564D00349106B8497785DD7D1D713A8AE82B32FA79D5F7FC407D39B"}, false},
292         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F69E89B4C5564D00349106B8497785DD7D1D713A8AE82B32FA79D5F7FC407D39B"}, false},
293         {{"DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "6CFF5C3BA86C69EA4B7376F31A9BCB4F74C1976089B2D9963DA2E5543E177769FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141"}, false},
294         {{"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC30", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "6CFF5C3BA86C69EA4B7376F31A9BCB4F74C1976089B2D9963DA2E5543E17776969E89B4C5564D00349106B8497785DD7D1D713A8AE82B32FA79D5F7FC407D39B"}, false}
295     };
296 
297     for (const auto& test : VECTORS) {
298         auto pubkey = ParseHex(test.first[0]);
299         auto msg = ParseHex(test.first[1]);
300         auto sig = ParseHex(test.first[2]);
301         BOOST_CHECK_EQUAL(XOnlyPubKey(pubkey).VerifySchnorr(uint256(msg), sig), test.second);
302     }
303 
304     static const std::vector<std::array<std::string, 5>> SIGN_VECTORS = {
305         {{"0000000000000000000000000000000000000000000000000000000000000003", "F9308A019258C31049344F85F89D5229B531C845836F99B08601F113BCE036F9", "0000000000000000000000000000000000000000000000000000000000000000", "0000000000000000000000000000000000000000000000000000000000000000", "E907831F80848D1069A5371B402410364BDF1C5F8307B0084C55F1CE2DCA821525F66A4A85EA8B71E482A74F382D2CE5EBEEE8FDB2172F477DF4900D310536C0"}},
306         {{"B7E151628AED2A6ABF7158809CF4F3C762E7160F38B4DA56A784D9045190CFEF", "DFF1D77F2A671C5F36183726DB2341BE58FEAE1DA2DECED843240F7B502BA659", "0000000000000000000000000000000000000000000000000000000000000001", "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89", "6896BD60EEAE296DB48A229FF71DFE071BDE413E6D43F917DC8DCF8C78DE33418906D11AC976ABCCB20B091292BFF4EA897EFCB639EA871CFA95F6DE339E4B0A"}},
307         {{"C90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B14E5C9", "DD308AFEC5777E13121FA72B9CC1B7CC0139715309B086C960E18FD969774EB8", "C87AA53824B4D7AE2EB035A2B5BBBCCC080E76CDC6D1692C4B0B62D798E6D906", "7E2D58D8B3BCDF1ABADEC7829054F90DDA9805AAB56C77333024B9D0A508B75C", "5831AAEED7B44BB74E5EAB94BA9D4294C49BCF2A60728D8B4C200F50DD313C1BAB745879A5AD954A72C45A91C3A51D3C7ADEA98D82F8481E0E1E03674A6F3FB7"}},
308         {{"0B432B2677937381AEF05BB02A66ECD012773062CF3FA2549E44F58ED2401710", "25D1DFF95105F5253C4022F628A996AD3A0D95FBF21D468A1B33F8C160D8F517", "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", "7EB0509757E246F19449885651611CB965ECC1A187DD51B64FDA1EDC9637D5EC97582B9CB13DB3933705B32BA982AF5AF25FD78881EBB32771FC5922EFC66EA3"}},
309     };
310 
311     for (const auto& [sec_hex, pub_hex, aux_hex, msg_hex, sig_hex] : SIGN_VECTORS) {
312         auto sec = ParseHex(sec_hex);
313         auto pub = ParseHex(pub_hex);
314         uint256 aux256(ParseHex(aux_hex));
315         uint256 msg256(ParseHex(msg_hex));
316         auto sig = ParseHex(sig_hex);
317         unsigned char sig64[64];
318 
319         // Run the untweaked test vectors above, comparing with exact expected signature.
320         CKey key;
321         key.Set(sec.begin(), sec.end(), true);
322         XOnlyPubKey pubkey(key.GetPubKey());
323         BOOST_CHECK(std::equal(pubkey.begin(), pubkey.end(), pub.begin(), pub.end()));
324         bool ok = key.SignSchnorr(msg256, sig64, nullptr, &aux256);
325         BOOST_CHECK(ok);
326         BOOST_CHECK(std::vector<unsigned char>(sig64, sig64 + 64) == sig);
327         // Verify those signatures for good measure.
328         BOOST_CHECK(pubkey.VerifySchnorr(msg256, sig64));
329 
330         // Do 10 iterations where we sign with a random Merkle root to tweak,
331         // and compare against the resulting tweaked keys, with random aux.
332         // In iteration i=0 we tweak with empty Merkle tree.
333         for (int i = 0; i < 10; ++i) {
334             uint256 merkle_root;
335             if (i) merkle_root = InsecureRand256();
336             auto tweaked = pubkey.CreateTapTweak(i ? &merkle_root : nullptr);
337             BOOST_CHECK(tweaked);
338             XOnlyPubKey tweaked_key = tweaked->first;
339             aux256 = InsecureRand256();
340             bool ok = key.SignSchnorr(msg256, sig64, &merkle_root, &aux256);
341             BOOST_CHECK(ok);
342             BOOST_CHECK(tweaked_key.VerifySchnorr(msg256, sig64));
343         }
344     }
345 }
346 
347 BOOST_AUTO_TEST_SUITE_END()
348