Branch data Line data Source code
1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-2022 The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #include <script/sign.h>
7 : :
8 : : #include <consensus/amount.h>
9 : : #include <key.h>
10 : : #include <policy/policy.h>
11 : : #include <primitives/transaction.h>
12 : : #include <script/keyorigin.h>
13 : : #include <script/miniscript.h>
14 : : #include <script/script.h>
15 : : #include <script/signingprovider.h>
16 : : #include <script/solver.h>
17 : : #include <uint256.h>
18 : : #include <util/translation.h>
19 : : #include <util/vector.h>
20 : :
21 : : typedef std::vector<unsigned char> valtype;
22 : :
23 : 0 : MutableTransactionSignatureCreator::MutableTransactionSignatureCreator(const CMutableTransaction& tx, unsigned int input_idx, const CAmount& amount, int hash_type)
24 [ # # ]: 0 : : m_txto{tx}, nIn{input_idx}, nHashType{hash_type}, amount{amount}, checker{&m_txto, nIn, amount, MissingDataBehavior::FAIL},
25 : 0 : m_txdata(nullptr)
26 : 0 : {
27 : 0 : }
28 : :
29 : 0 : MutableTransactionSignatureCreator::MutableTransactionSignatureCreator(const CMutableTransaction& tx, unsigned int input_idx, const CAmount& amount, const PrecomputedTransactionData* txdata, int hash_type)
30 : 0 : : m_txto{tx}, nIn{input_idx}, nHashType{hash_type}, amount{amount},
31 [ # # ][ # # ]: 0 : checker{txdata ? MutableTransactionSignatureChecker{&m_txto, nIn, amount, *txdata, MissingDataBehavior::FAIL} :
32 [ # # ]: 0 : MutableTransactionSignatureChecker{&m_txto, nIn, amount, MissingDataBehavior::FAIL}},
33 : 0 : m_txdata(txdata)
34 : 0 : {
35 : 0 : }
36 : :
37 : 0 : bool MutableTransactionSignatureCreator::CreateSig(const SigningProvider& provider, std::vector<unsigned char>& vchSig, const CKeyID& address, const CScript& scriptCode, SigVersion sigversion) const
38 : : {
39 [ # # ][ # # ]: 0 : assert(sigversion == SigVersion::BASE || sigversion == SigVersion::WITNESS_V0);
40 : :
41 : 0 : CKey key;
42 [ # # ][ # # ]: 0 : if (!provider.GetKey(address, key))
43 : 0 : return false;
44 : :
45 : : // Signing with uncompressed keys is disabled in witness scripts
46 [ # # ][ # # ]: 0 : if (sigversion == SigVersion::WITNESS_V0 && !key.IsCompressed())
[ # # ]
47 : 0 : return false;
48 : :
49 : : // Signing without known amount does not work in witness scripts.
50 [ # # ][ # # ]: 0 : if (sigversion == SigVersion::WITNESS_V0 && !MoneyRange(amount)) return false;
[ # # ]
51 : :
52 : : // BASE/WITNESS_V0 signatures don't support explicit SIGHASH_DEFAULT, use SIGHASH_ALL instead.
53 [ # # ]: 0 : const int hashtype = nHashType == SIGHASH_DEFAULT ? SIGHASH_ALL : nHashType;
54 : :
55 [ # # ]: 0 : uint256 hash = SignatureHash(scriptCode, m_txto, nIn, hashtype, amount, sigversion, m_txdata);
56 [ # # ][ # # ]: 0 : if (!key.Sign(hash, vchSig))
57 : 0 : return false;
58 [ # # ]: 0 : vchSig.push_back((unsigned char)hashtype);
59 : 0 : return true;
60 : 0 : }
61 : :
62 : 0 : bool MutableTransactionSignatureCreator::CreateSchnorrSig(const SigningProvider& provider, std::vector<unsigned char>& sig, const XOnlyPubKey& pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion) const
63 : : {
64 [ # # ][ # # ]: 0 : assert(sigversion == SigVersion::TAPROOT || sigversion == SigVersion::TAPSCRIPT);
65 : :
66 : 0 : CKey key;
67 [ # # ][ # # ]: 0 : if (!provider.GetKeyByXOnly(pubkey, key)) return false;
68 : :
69 : : // BIP341/BIP342 signing needs lots of precomputed transaction data. While some
70 : : // (non-SIGHASH_DEFAULT) sighash modes exist that can work with just some subset
71 : : // of data present, for now, only support signing when everything is provided.
72 [ # # ][ # # ]: 0 : if (!m_txdata || !m_txdata->m_bip341_taproot_ready || !m_txdata->m_spent_outputs_ready) return false;
[ # # ]
73 : :
74 [ # # ]: 0 : ScriptExecutionData execdata;
75 : 0 : execdata.m_annex_init = true;
76 : 0 : execdata.m_annex_present = false; // Only support annex-less signing for now.
77 [ # # ]: 0 : if (sigversion == SigVersion::TAPSCRIPT) {
78 : 0 : execdata.m_codeseparator_pos_init = true;
79 : 0 : execdata.m_codeseparator_pos = 0xFFFFFFFF; // Only support non-OP_CODESEPARATOR BIP342 signing for now.
80 [ # # ]: 0 : if (!leaf_hash) return false; // BIP342 signing needs leaf hash.
81 : 0 : execdata.m_tapleaf_hash_init = true;
82 : 0 : execdata.m_tapleaf_hash = *leaf_hash;
83 : 0 : }
84 [ # # ]: 0 : uint256 hash;
85 [ # # ][ # # ]: 0 : if (!SignatureHashSchnorr(hash, execdata, m_txto, nIn, nHashType, sigversion, *m_txdata, MissingDataBehavior::FAIL)) return false;
86 [ # # ]: 0 : sig.resize(64);
87 : : // Use uint256{} as aux_rnd for now.
88 [ # # ][ # # ]: 0 : if (!key.SignSchnorr(hash, sig, merkle_root, {})) return false;
[ # # ][ # # ]
89 [ # # ][ # # ]: 0 : if (nHashType) sig.push_back(nHashType);
90 : 0 : return true;
91 : 0 : }
92 : :
93 : 0 : static bool GetCScript(const SigningProvider& provider, const SignatureData& sigdata, const CScriptID& scriptid, CScript& script)
94 : : {
95 [ # # ]: 0 : if (provider.GetCScript(scriptid, script)) {
96 : 0 : return true;
97 : : }
98 : : // Look for scripts in SignatureData
99 [ # # ]: 0 : if (CScriptID(sigdata.redeem_script) == scriptid) {
100 : 0 : script = sigdata.redeem_script;
101 : 0 : return true;
102 [ # # ]: 0 : } else if (CScriptID(sigdata.witness_script) == scriptid) {
103 : 0 : script = sigdata.witness_script;
104 : 0 : return true;
105 : : }
106 : 0 : return false;
107 : 0 : }
108 : :
109 : 0 : static bool GetPubKey(const SigningProvider& provider, const SignatureData& sigdata, const CKeyID& address, CPubKey& pubkey)
110 : : {
111 : : // Look for pubkey in all partial sigs
112 : 0 : const auto it = sigdata.signatures.find(address);
113 [ # # ]: 0 : if (it != sigdata.signatures.end()) {
114 : 0 : pubkey = it->second.first;
115 : 0 : return true;
116 : : }
117 : : // Look for pubkey in pubkey list
118 : 0 : const auto& pk_it = sigdata.misc_pubkeys.find(address);
119 [ # # ]: 0 : if (pk_it != sigdata.misc_pubkeys.end()) {
120 : 0 : pubkey = pk_it->second.first;
121 : 0 : return true;
122 : : }
123 : : // Query the underlying provider
124 : 0 : return provider.GetPubKey(address, pubkey);
125 : 0 : }
126 : :
127 : 0 : static bool CreateSig(const BaseSignatureCreator& creator, SignatureData& sigdata, const SigningProvider& provider, std::vector<unsigned char>& sig_out, const CPubKey& pubkey, const CScript& scriptcode, SigVersion sigversion)
128 : : {
129 : 0 : CKeyID keyid = pubkey.GetID();
130 : 0 : const auto it = sigdata.signatures.find(keyid);
131 [ # # ]: 0 : if (it != sigdata.signatures.end()) {
132 : 0 : sig_out = it->second.second;
133 : 0 : return true;
134 : : }
135 : 0 : KeyOriginInfo info;
136 [ # # ][ # # ]: 0 : if (provider.GetKeyOrigin(keyid, info)) {
137 [ # # ][ # # ]: 0 : sigdata.misc_pubkeys.emplace(keyid, std::make_pair(pubkey, std::move(info)));
138 : 0 : }
139 [ # # ][ # # ]: 0 : if (creator.CreateSig(provider, sig_out, keyid, scriptcode, sigversion)) {
140 [ # # ][ # # ]: 0 : auto i = sigdata.signatures.emplace(keyid, SigPair(pubkey, sig_out));
141 [ # # ]: 0 : assert(i.second);
142 : 0 : return true;
143 : : }
144 : : // Could not make signature or signature not found, add keyid to missing
145 [ # # ]: 0 : sigdata.missing_sigs.push_back(keyid);
146 : 0 : return false;
147 : 0 : }
148 : :
149 : 0 : static bool CreateTaprootScriptSig(const BaseSignatureCreator& creator, SignatureData& sigdata, const SigningProvider& provider, std::vector<unsigned char>& sig_out, const XOnlyPubKey& pubkey, const uint256& leaf_hash, SigVersion sigversion)
150 : : {
151 : 0 : KeyOriginInfo info;
152 [ # # ][ # # ]: 0 : if (provider.GetKeyOriginByXOnly(pubkey, info)) {
153 [ # # ]: 0 : auto it = sigdata.taproot_misc_pubkeys.find(pubkey);
154 [ # # ]: 0 : if (it == sigdata.taproot_misc_pubkeys.end()) {
155 [ # # ][ # # ]: 0 : sigdata.taproot_misc_pubkeys.emplace(pubkey, std::make_pair(std::set<uint256>({leaf_hash}), info));
[ # # ]
156 : 0 : } else {
157 [ # # ]: 0 : it->second.first.insert(leaf_hash);
158 : : }
159 : 0 : }
160 : :
161 [ # # ]: 0 : auto lookup_key = std::make_pair(pubkey, leaf_hash);
162 [ # # ]: 0 : auto it = sigdata.taproot_script_sigs.find(lookup_key);
163 [ # # ]: 0 : if (it != sigdata.taproot_script_sigs.end()) {
164 [ # # ]: 0 : sig_out = it->second;
165 : 0 : return true;
166 : : }
167 [ # # ][ # # ]: 0 : if (creator.CreateSchnorrSig(provider, sig_out, pubkey, &leaf_hash, nullptr, sigversion)) {
168 [ # # ][ # # ]: 0 : sigdata.taproot_script_sigs[lookup_key] = sig_out;
169 : 0 : return true;
170 : : }
171 : 0 : return false;
172 : 0 : }
173 : :
174 : 0 : static bool SignTaprootScript(const SigningProvider& provider, const BaseSignatureCreator& creator, SignatureData& sigdata, int leaf_version, Span<const unsigned char> script_bytes, std::vector<valtype>& result)
175 : : {
176 : : // Only BIP342 tapscript signing is supported for now.
177 [ # # ]: 0 : if (leaf_version != TAPROOT_LEAF_TAPSCRIPT) return false;
178 : 0 : SigVersion sigversion = SigVersion::TAPSCRIPT;
179 : :
180 : 0 : uint256 leaf_hash = ComputeTapleafHash(leaf_version, script_bytes);
181 : 0 : CScript script = CScript(script_bytes.begin(), script_bytes.end());
182 : :
183 : : // <xonly pubkey> OP_CHECKSIG
184 [ # # ][ # # ]: 0 : if (script.size() == 34 && script[33] == OP_CHECKSIG && script[0] == 0x20) {
[ # # ][ # # ]
[ # # ][ # # ]
185 [ # # ][ # # ]: 0 : XOnlyPubKey pubkey{Span{script}.subspan(1, 32)};
186 : 0 : std::vector<unsigned char> sig;
187 [ # # ][ # # ]: 0 : if (CreateTaprootScriptSig(creator, sigdata, provider, sig, pubkey, leaf_hash, sigversion)) {
188 [ # # ]: 0 : result = Vector(std::move(sig));
189 : 0 : return true;
190 : : }
191 : 0 : return false;
192 : 0 : }
193 : :
194 : : // multi_a scripts (<key> OP_CHECKSIG <key> OP_CHECKSIGADD <key> OP_CHECKSIGADD <k> OP_NUMEQUAL)
195 [ # # ][ # # ]: 0 : if (auto match = MatchMultiA(script)) {
[ # # ]
196 : 0 : std::vector<std::vector<unsigned char>> sigs;
197 : 0 : int good_sigs = 0;
198 [ # # ]: 0 : for (size_t i = 0; i < match->second.size(); ++i) {
199 [ # # ][ # # ]: 0 : XOnlyPubKey pubkey{*(match->second.rbegin() + i)};
[ # # ]
200 : 0 : std::vector<unsigned char> sig;
201 [ # # ]: 0 : bool good_sig = CreateTaprootScriptSig(creator, sigdata, provider, sig, pubkey, leaf_hash, sigversion);
202 [ # # ][ # # ]: 0 : if (good_sig && good_sigs < match->first) {
203 : 0 : ++good_sigs;
204 [ # # ]: 0 : sigs.push_back(std::move(sig));
205 : 0 : } else {
206 [ # # ]: 0 : sigs.emplace_back();
207 : : }
208 : 0 : }
209 [ # # ]: 0 : if (good_sigs == match->first) {
210 : 0 : result = std::move(sigs);
211 : 0 : return true;
212 : : }
213 : 0 : return false;
214 : 0 : }
215 : :
216 : 0 : return false;
217 : 0 : }
218 : :
219 : 0 : static bool SignTaproot(const SigningProvider& provider, const BaseSignatureCreator& creator, const WitnessV1Taproot& output, SignatureData& sigdata, std::vector<valtype>& result)
220 : : {
221 : 0 : TaprootSpendData spenddata;
222 [ # # ]: 0 : TaprootBuilder builder;
223 : :
224 : : // Gather information about this output.
225 [ # # ][ # # ]: 0 : if (provider.GetTaprootSpendData(output, spenddata)) {
226 [ # # ][ # # ]: 0 : sigdata.tr_spenddata.Merge(spenddata);
227 : 0 : }
228 [ # # ][ # # ]: 0 : if (provider.GetTaprootBuilder(output, builder)) {
229 [ # # ]: 0 : sigdata.tr_builder = builder;
230 : 0 : }
231 : :
232 : : // Try key path spending.
233 : : {
234 : 0 : KeyOriginInfo info;
235 [ # # ][ # # ]: 0 : if (provider.GetKeyOriginByXOnly(sigdata.tr_spenddata.internal_key, info)) {
236 [ # # ]: 0 : auto it = sigdata.taproot_misc_pubkeys.find(sigdata.tr_spenddata.internal_key);
237 [ # # ]: 0 : if (it == sigdata.taproot_misc_pubkeys.end()) {
238 [ # # ][ # # ]: 0 : sigdata.taproot_misc_pubkeys.emplace(sigdata.tr_spenddata.internal_key, std::make_pair(std::set<uint256>(), info));
239 : 0 : }
240 : 0 : }
241 : :
242 : 0 : std::vector<unsigned char> sig;
243 [ # # ]: 0 : if (sigdata.taproot_key_path_sig.size() == 0) {
244 [ # # ][ # # ]: 0 : if (creator.CreateSchnorrSig(provider, sig, sigdata.tr_spenddata.internal_key, nullptr, &sigdata.tr_spenddata.merkle_root, SigVersion::TAPROOT)) {
245 [ # # ]: 0 : sigdata.taproot_key_path_sig = sig;
246 : 0 : }
247 : 0 : }
248 [ # # ]: 0 : if (sigdata.taproot_key_path_sig.size() == 0) {
249 [ # # ][ # # ]: 0 : if (creator.CreateSchnorrSig(provider, sig, output, nullptr, nullptr, SigVersion::TAPROOT)) {
250 [ # # ]: 0 : sigdata.taproot_key_path_sig = sig;
251 : 0 : }
252 : 0 : }
253 [ # # ]: 0 : if (sigdata.taproot_key_path_sig.size()) {
254 [ # # ]: 0 : result = Vector(sigdata.taproot_key_path_sig);
255 : 0 : return true;
256 : : }
257 [ # # ]: 0 : }
258 : :
259 : : // Try script path spending.
260 : 0 : std::vector<std::vector<unsigned char>> smallest_result_stack;
261 [ # # ]: 0 : for (const auto& [key, control_blocks] : sigdata.tr_spenddata.scripts) {
262 : 0 : const auto& [script, leaf_ver] = key;
263 : 0 : std::vector<std::vector<unsigned char>> result_stack;
264 [ # # ][ # # ]: 0 : if (SignTaprootScript(provider, creator, sigdata, leaf_ver, script, result_stack)) {
[ # # ][ # # ]
[ # # ]
265 [ # # ][ # # ]: 0 : result_stack.emplace_back(std::begin(script), std::end(script)); // Push the script
[ # # ][ # # ]
266 [ # # ]: 0 : result_stack.push_back(*control_blocks.begin()); // Push the smallest control block
267 [ # # ][ # # ]: 0 : if (smallest_result_stack.size() == 0 ||
268 [ # # ][ # # ]: 0 : GetSerializeSize(result_stack, PROTOCOL_VERSION) < GetSerializeSize(smallest_result_stack, PROTOCOL_VERSION)) {
269 : 0 : smallest_result_stack = std::move(result_stack);
270 : 0 : }
271 : 0 : }
272 : 0 : }
273 [ # # ]: 0 : if (smallest_result_stack.size() != 0) {
274 : 0 : result = std::move(smallest_result_stack);
275 : 0 : return true;
276 : : }
277 : :
278 : 0 : return false;
279 : 0 : }
280 : :
281 [ + - ]: 2 : /**
282 : : * Sign scriptPubKey using signature made with creator.
283 [ + - ][ - + ]: 2 : * Signatures are returned in scriptSigRet (or returns false if scriptPubKey can't be signed),
[ + - ][ + - ]
284 : : * unless whichTypeRet is TxoutType::SCRIPTHASH, in which case scriptSigRet is the redemption script.
285 [ + - ]: 2 : * Returns false if scriptPubKey could not be completely satisfied.
286 : : */
287 : 2 : static bool SignStep(const SigningProvider& provider, const BaseSignatureCreator& creator, const CScript& scriptPubKey,
288 : : std::vector<valtype>& ret, TxoutType& whichTypeRet, SigVersion sigversion, SignatureData& sigdata)
289 [ + - ][ + - ]: 2 : {
290 : 0 : CScript scriptRet;
291 : 0 : ret.clear();
292 : 0 : std::vector<unsigned char> sig;
293 : :
294 : 0 : std::vector<valtype> vSolutions;
295 [ # # ]: 0 : whichTypeRet = Solver(scriptPubKey, vSolutions);
296 : :
297 [ # # # # : 0 : switch (whichTypeRet) {
# # # #
# ]
298 : : case TxoutType::NONSTANDARD:
299 : : case TxoutType::NULL_DATA:
300 : : case TxoutType::WITNESS_UNKNOWN:
301 : 0 : return false;
302 : : case TxoutType::PUBKEY:
303 [ # # ][ # # ]: 0 : if (!CreateSig(creator, sigdata, provider, sig, CPubKey(vSolutions[0]), scriptPubKey, sigversion)) return false;
[ # # ][ # # ]
304 [ # # ]: 0 : ret.push_back(std::move(sig));
305 : 0 : return true;
306 : : case TxoutType::PUBKEYHASH: {
307 [ # # ][ # # ]: 0 : CKeyID keyID = CKeyID(uint160(vSolutions[0]));
[ # # ]
308 [ # # ]: 0 : CPubKey pubkey;
309 [ # # ][ # # ]: 0 : if (!GetPubKey(provider, sigdata, keyID, pubkey)) {
310 : : // Pubkey could not be found, add to missing
311 [ # # ]: 0 : sigdata.missing_pubkeys.push_back(keyID);
312 : 0 : return false;
313 : : }
314 [ # # ][ # # ]: 0 : if (!CreateSig(creator, sigdata, provider, sig, pubkey, scriptPubKey, sigversion)) return false;
315 [ # # ]: 0 : ret.push_back(std::move(sig));
316 [ # # ][ # # ]: 0 : ret.push_back(ToByteVector(pubkey));
317 : 0 : return true;
318 : : }
319 : : case TxoutType::SCRIPTHASH: {
320 [ # # ][ # # ]: 0 : uint160 h160{vSolutions[0]};
321 [ # # ][ # # ]: 0 : if (GetCScript(provider, sigdata, CScriptID{h160}, scriptRet)) {
[ # # ]
322 [ # # ][ # # ]: 0 : ret.push_back(std::vector<unsigned char>(scriptRet.begin(), scriptRet.end()));
[ # # ][ # # ]
323 : 0 : return true;
324 : : }
325 : : // Could not find redeemScript, add to missing
326 : 0 : sigdata.missing_redeem_script = h160;
327 : 0 : return false;
328 : : }
329 : : case TxoutType::MULTISIG: {
330 : 0 : size_t required = vSolutions.front()[0];
331 [ # # ]: 0 : ret.push_back(valtype()); // workaround CHECKMULTISIG bug
332 [ # # ]: 0 : for (size_t i = 1; i < vSolutions.size() - 1; ++i) {
333 [ # # ][ # # ]: 0 : CPubKey pubkey = CPubKey(vSolutions[i]);
334 : : // We need to always call CreateSig in order to fill sigdata with all
335 : : // possible signatures that we can create. This will allow further PSBT
336 : : // processing to work as it needs all possible signature and pubkey pairs
337 [ # # ][ # # ]: 0 : if (CreateSig(creator, sigdata, provider, sig, pubkey, scriptPubKey, sigversion)) {
338 [ # # ]: 0 : if (ret.size() < required + 1) {
339 [ # # ]: 0 : ret.push_back(std::move(sig));
340 : 0 : }
341 : 0 : }
342 : 0 : }
343 : 0 : bool ok = ret.size() == required + 1;
344 [ # # ]: 0 : for (size_t i = 0; i + ret.size() < required + 1; ++i) {
345 [ # # ]: 0 : ret.push_back(valtype());
346 : 0 : }
347 : 0 : return ok;
348 : : }
349 : : case TxoutType::WITNESS_V0_KEYHASH:
350 [ # # ]: 0 : ret.push_back(vSolutions[0]);
351 : 0 : return true;
352 : :
353 : : case TxoutType::WITNESS_V0_SCRIPTHASH:
354 [ # # ][ # # ]: 0 : if (GetCScript(provider, sigdata, CScriptID{RIPEMD160(vSolutions[0])}, scriptRet)) {
[ # # ][ # # ]
[ # # ]
355 [ # # ][ # # ]: 0 : ret.push_back(std::vector<unsigned char>(scriptRet.begin(), scriptRet.end()));
[ # # ][ # # ]
356 : 0 : return true;
357 : : }
358 : : // Could not find witnessScript, add to missing
359 [ # # ][ # # ]: 0 : sigdata.missing_witness_script = uint256(vSolutions[0]);
360 : 0 : return false;
361 : :
362 : : case TxoutType::WITNESS_V1_TAPROOT:
363 [ # # ][ # # ]: 0 : return SignTaproot(provider, creator, WitnessV1Taproot(XOnlyPubKey{vSolutions[0]}), sigdata, ret);
[ # # ][ # # ]
364 : : } // no default case, so the compiler can warn about missing cases
365 : 0 : assert(false);
366 : 0 : }
367 : :
368 : 0 : static CScript PushAll(const std::vector<valtype>& values)
369 : : {
370 : 0 : CScript result;
371 [ # # ]: 0 : for (const valtype& v : values) {
372 [ # # ]: 0 : if (v.size() == 0) {
373 [ # # ]: 0 : result << OP_0;
374 [ # # ][ # # ]: 0 : } else if (v.size() == 1 && v[0] >= 1 && v[0] <= 16) {
[ # # ]
375 [ # # ][ # # ]: 0 : result << CScript::EncodeOP_N(v[0]);
376 [ # # ][ # # ]: 0 : } else if (v.size() == 1 && v[0] == 0x81) {
377 [ # # ]: 0 : result << OP_1NEGATE;
378 : 0 : } else {
379 [ # # ]: 0 : result << v;
380 : : }
381 : : }
382 : 0 : return result;
383 [ # # ]: 0 : }
384 : :
385 : : template<typename M, typename K, typename V>
386 : 0 : miniscript::Availability MsLookupHelper(const M& map, const K& key, V& value)
387 : : {
388 : 0 : auto it = map.find(key);
389 [ # # ]: 0 : if (it != map.end()) {
390 : 0 : value = it->second;
391 : 0 : return miniscript::Availability::YES;
392 : : }
393 : 0 : return miniscript::Availability::NO;
394 : 0 : }
395 : :
396 : : /**
397 : : * Context for solving a Miniscript.
398 : : * If enough material (access to keys, hash preimages, ..) is given, produces a valid satisfaction.
399 : : */
400 : : struct Satisfier {
401 : : typedef CPubKey Key;
402 : :
403 : : const SigningProvider& m_provider;
404 : : SignatureData& m_sig_data;
405 : : const BaseSignatureCreator& m_creator;
406 : : const CScript& m_witness_script;
407 : :
408 : 0 : explicit Satisfier(const SigningProvider& provider LIFETIMEBOUND, SignatureData& sig_data LIFETIMEBOUND,
409 : : const BaseSignatureCreator& creator LIFETIMEBOUND,
410 : 0 : const CScript& witscript LIFETIMEBOUND) : m_provider(provider),
411 : 0 : m_sig_data(sig_data),
412 : 0 : m_creator(creator),
413 : 0 : m_witness_script(witscript) {}
414 : :
415 : 0 : static bool KeyCompare(const Key& a, const Key& b) {
416 : 0 : return a < b;
417 : : }
418 : :
419 : : //! Conversion from a raw public key.
420 : : template <typename I>
421 : 0 : std::optional<Key> FromPKBytes(I first, I last) const
422 : : {
423 : 0 : Key pubkey{first, last};
424 [ # # ]: 0 : if (pubkey.IsValid()) return pubkey;
425 : 0 : return {};
426 : 0 : }
427 : :
428 : : //! Conversion from a raw public key hash.
429 : : template<typename I>
430 : 0 : std::optional<Key> FromPKHBytes(I first, I last) const {
431 [ # # ]: 0 : assert(last - first == 20);
432 : 0 : Key pubkey;
433 : 0 : CKeyID key_id;
434 : 0 : std::copy(first, last, key_id.begin());
435 [ # # ]: 0 : if (GetPubKey(m_provider, m_sig_data, key_id, pubkey)) return pubkey;
436 : 0 : m_sig_data.missing_pubkeys.push_back(key_id);
437 : 0 : return {};
438 : 0 : }
439 : :
440 : : //! Conversion to raw public key.
441 [ # # ]: 0 : std::vector<unsigned char> ToPKBytes(const CPubKey& key) const { return {key.begin(), key.end()}; }
442 : :
443 : : //! Satisfy a signature check.
444 : 0 : miniscript::Availability Sign(const CPubKey& key, std::vector<unsigned char>& sig) const {
445 [ # # ]: 0 : if (CreateSig(m_creator, m_sig_data, m_provider, sig, key, m_witness_script, SigVersion::WITNESS_V0)) {
446 : 0 : return miniscript::Availability::YES;
447 : : }
448 : 0 : return miniscript::Availability::NO;
449 : 0 : }
450 : :
451 : : //! Time lock satisfactions.
452 : 0 : bool CheckAfter(uint32_t value) const { return m_creator.Checker().CheckLockTime(CScriptNum(value)); }
453 : 0 : bool CheckOlder(uint32_t value) const { return m_creator.Checker().CheckSequence(CScriptNum(value)); }
454 : :
455 : :
456 : : //! Hash preimage satisfactions.
457 : 0 : miniscript::Availability SatSHA256(const std::vector<unsigned char>& hash, std::vector<unsigned char>& preimage) const {
458 : 0 : return MsLookupHelper(m_sig_data.sha256_preimages, hash, preimage);
459 : : }
460 : 0 : miniscript::Availability SatRIPEMD160(const std::vector<unsigned char>& hash, std::vector<unsigned char>& preimage) const {
461 : 0 : return MsLookupHelper(m_sig_data.ripemd160_preimages, hash, preimage);
462 : : }
463 : 0 : miniscript::Availability SatHASH256(const std::vector<unsigned char>& hash, std::vector<unsigned char>& preimage) const {
464 : 0 : return MsLookupHelper(m_sig_data.hash256_preimages, hash, preimage);
465 : : }
466 : 0 : miniscript::Availability SatHASH160(const std::vector<unsigned char>& hash, std::vector<unsigned char>& preimage) const {
467 : 0 : return MsLookupHelper(m_sig_data.hash160_preimages, hash, preimage);
468 : : }
469 : : };
470 : :
471 : 0 : bool ProduceSignature(const SigningProvider& provider, const BaseSignatureCreator& creator, const CScript& fromPubKey, SignatureData& sigdata)
472 : : {
473 [ # # ]: 0 : if (sigdata.complete) return true;
474 : :
475 : 0 : std::vector<valtype> result;
476 : : TxoutType whichType;
477 [ # # ]: 0 : bool solved = SignStep(provider, creator, fromPubKey, result, whichType, SigVersion::BASE, sigdata);
478 : 0 : bool P2SH = false;
479 [ # # ]: 0 : CScript subscript;
480 : :
481 [ # # ][ # # ]: 0 : if (solved && whichType == TxoutType::SCRIPTHASH)
482 : : {
483 : : // Solver returns the subscript that needs to be evaluated;
484 : : // the final scriptSig is the signatures from that
485 : : // and then the serialized subscript:
486 [ # # ]: 0 : subscript = CScript(result[0].begin(), result[0].end());
487 [ # # ]: 0 : sigdata.redeem_script = subscript;
488 [ # # ][ # # ]: 0 : solved = solved && SignStep(provider, creator, subscript, result, whichType, SigVersion::BASE, sigdata) && whichType != TxoutType::SCRIPTHASH;
[ # # ]
489 : 0 : P2SH = true;
490 : 0 : }
491 : :
492 [ # # ][ # # ]: 0 : if (solved && whichType == TxoutType::WITNESS_V0_KEYHASH)
493 : : {
494 [ # # ]: 0 : CScript witnessscript;
495 [ # # ][ # # ]: 0 : witnessscript << OP_DUP << OP_HASH160 << ToByteVector(result[0]) << OP_EQUALVERIFY << OP_CHECKSIG;
[ # # ][ # # ]
[ # # ][ # # ]
496 : : TxoutType subType;
497 [ # # ][ # # ]: 0 : solved = solved && SignStep(provider, creator, witnessscript, result, subType, SigVersion::WITNESS_V0, sigdata);
498 [ # # ]: 0 : sigdata.scriptWitness.stack = result;
499 : 0 : sigdata.witness = true;
500 : 0 : result.clear();
501 : 0 : }
502 [ # # ][ # # ]: 0 : else if (solved && whichType == TxoutType::WITNESS_V0_SCRIPTHASH)
503 : : {
504 [ # # ]: 0 : CScript witnessscript(result[0].begin(), result[0].end());
505 [ # # ]: 0 : sigdata.witness_script = witnessscript;
506 : :
507 : 0 : TxoutType subType{TxoutType::NONSTANDARD};
508 [ # # ][ # # ]: 0 : solved = solved && SignStep(provider, creator, witnessscript, result, subType, SigVersion::WITNESS_V0, sigdata) && subType != TxoutType::SCRIPTHASH && subType != TxoutType::WITNESS_V0_SCRIPTHASH && subType != TxoutType::WITNESS_V0_KEYHASH;
[ # # ][ # # ]
[ # # ]
509 : :
510 : : // If we couldn't find a solution with the legacy satisfier, try satisfying the script using Miniscript.
511 : : // Note we need to check if the result stack is empty before, because it might be used even if the Script
512 : : // isn't fully solved. For instance the CHECKMULTISIG satisfaction in SignStep() pushes partial signatures
513 : : // and the extractor relies on this behaviour to combine witnesses.
514 [ # # ][ # # ]: 0 : if (!solved && result.empty()) {
515 [ # # ]: 0 : Satisfier ms_satisfier{provider, sigdata, creator, witnessscript};
516 [ # # ]: 0 : const auto ms = miniscript::FromScript(witnessscript, ms_satisfier);
517 [ # # ][ # # ]: 0 : solved = ms && ms->Satisfy(ms_satisfier, result) == miniscript::Availability::YES;
518 : 0 : }
519 [ # # ][ # # ]: 0 : result.push_back(std::vector<unsigned char>(witnessscript.begin(), witnessscript.end()));
[ # # ][ # # ]
520 : :
521 [ # # ]: 0 : sigdata.scriptWitness.stack = result;
522 : 0 : sigdata.witness = true;
523 : 0 : result.clear();
524 [ # # ][ # # ]: 0 : } else if (whichType == TxoutType::WITNESS_V1_TAPROOT && !P2SH) {
525 : 0 : sigdata.witness = true;
526 [ # # ]: 0 : if (solved) {
527 : 0 : sigdata.scriptWitness.stack = std::move(result);
528 : 0 : }
529 : 0 : result.clear();
530 [ # # ][ # # ]: 0 : } else if (solved && whichType == TxoutType::WITNESS_UNKNOWN) {
531 : 0 : sigdata.witness = true;
532 : 0 : }
533 : :
534 [ # # ]: 0 : if (!sigdata.witness) sigdata.scriptWitness.stack.clear();
535 [ # # ]: 0 : if (P2SH) {
536 [ # # ][ # # ]: 0 : result.push_back(std::vector<unsigned char>(subscript.begin(), subscript.end()));
[ # # ][ # # ]
537 : 0 : }
538 [ # # ]: 0 : sigdata.scriptSig = PushAll(result);
539 : :
540 : : // Test solution
541 [ # # ][ # # ]: 0 : sigdata.complete = solved && VerifyScript(sigdata.scriptSig, fromPubKey, &sigdata.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, creator.Checker());
[ # # ]
542 : 0 : return sigdata.complete;
543 : 0 : }
544 : :
545 : : namespace {
546 : 0 : class SignatureExtractorChecker final : public DeferringSignatureChecker
547 : : {
548 : : private:
549 : : SignatureData& sigdata;
550 : :
551 : : public:
552 : 0 : SignatureExtractorChecker(SignatureData& sigdata, BaseSignatureChecker& checker) : DeferringSignatureChecker(checker), sigdata(sigdata) {}
553 : :
554 : 0 : bool CheckECDSASignature(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const override
555 : : {
556 [ # # ]: 0 : if (m_checker.CheckECDSASignature(scriptSig, vchPubKey, scriptCode, sigversion)) {
557 : 0 : CPubKey pubkey(vchPubKey);
558 [ # # ]: 0 : sigdata.signatures.emplace(pubkey.GetID(), SigPair(pubkey, scriptSig));
559 : 0 : return true;
560 : : }
561 : 0 : return false;
562 : 0 : }
563 : : };
564 : :
565 : 0 : struct Stacks
566 : : {
567 : : std::vector<valtype> script;
568 : : std::vector<valtype> witness;
569 : :
570 : : Stacks() = delete;
571 : : Stacks(const Stacks&) = delete;
572 [ # # ]: 0 : explicit Stacks(const SignatureData& data) : witness(data.scriptWitness.stack) {
573 [ # # ]: 0 : EvalScript(script, data.scriptSig, SCRIPT_VERIFY_STRICTENC, BaseSignatureChecker(), SigVersion::BASE);
574 : 0 : }
575 : : };
576 : : }
577 : :
578 : : // Extracts signatures and scripts from incomplete scriptSigs. Please do not extend this, use PSBT instead
579 : 0 : SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nIn, const CTxOut& txout)
580 : : {
581 : 0 : SignatureData data;
582 [ # # ]: 0 : assert(tx.vin.size() > nIn);
583 [ # # ]: 0 : data.scriptSig = tx.vin[nIn].scriptSig;
584 [ # # ]: 0 : data.scriptWitness = tx.vin[nIn].scriptWitness;
585 [ # # ]: 0 : Stacks stack(data);
586 : :
587 : : // Get signatures
588 [ # # ]: 0 : MutableTransactionSignatureChecker tx_checker(&tx, nIn, txout.nValue, MissingDataBehavior::FAIL);
589 [ # # ]: 0 : SignatureExtractorChecker extractor_checker(data, tx_checker);
590 [ # # ][ # # ]: 0 : if (VerifyScript(data.scriptSig, txout.scriptPubKey, &data.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, extractor_checker)) {
591 : 0 : data.complete = true;
592 : 0 : return data;
593 : : }
594 : :
595 : : // Get scripts
596 : 0 : std::vector<std::vector<unsigned char>> solutions;
597 [ # # ]: 0 : TxoutType script_type = Solver(txout.scriptPubKey, solutions);
598 : 0 : SigVersion sigversion = SigVersion::BASE;
599 [ # # ]: 0 : CScript next_script = txout.scriptPubKey;
600 : :
601 [ # # ][ # # ]: 0 : if (script_type == TxoutType::SCRIPTHASH && !stack.script.empty() && !stack.script.back().empty()) {
[ # # ]
602 : : // Get the redeemScript
603 [ # # ]: 0 : CScript redeem_script(stack.script.back().begin(), stack.script.back().end());
604 [ # # ]: 0 : data.redeem_script = redeem_script;
605 : 0 : next_script = std::move(redeem_script);
606 : :
607 : : // Get redeemScript type
608 [ # # ]: 0 : script_type = Solver(next_script, solutions);
609 : 0 : stack.script.pop_back();
610 : 0 : }
611 [ # # ][ # # ]: 0 : if (script_type == TxoutType::WITNESS_V0_SCRIPTHASH && !stack.witness.empty() && !stack.witness.back().empty()) {
[ # # ]
612 : : // Get the witnessScript
613 [ # # ]: 0 : CScript witness_script(stack.witness.back().begin(), stack.witness.back().end());
614 [ # # ]: 0 : data.witness_script = witness_script;
615 : 0 : next_script = std::move(witness_script);
616 : :
617 : : // Get witnessScript type
618 [ # # ]: 0 : script_type = Solver(next_script, solutions);
619 : 0 : stack.witness.pop_back();
620 : 0 : stack.script = std::move(stack.witness);
621 : 0 : stack.witness.clear();
622 : 0 : sigversion = SigVersion::WITNESS_V0;
623 : 0 : }
624 [ # # ][ # # ]: 0 : if (script_type == TxoutType::MULTISIG && !stack.script.empty()) {
625 : : // Build a map of pubkey -> signature by matching sigs to pubkeys:
626 [ # # ]: 0 : assert(solutions.size() > 1);
627 : 0 : unsigned int num_pubkeys = solutions.size()-2;
628 : 0 : unsigned int last_success_key = 0;
629 [ # # ]: 0 : for (const valtype& sig : stack.script) {
630 [ # # ]: 0 : for (unsigned int i = last_success_key; i < num_pubkeys; ++i) {
631 : 0 : const valtype& pubkey = solutions[i+1];
632 : : // We either have a signature for this pubkey, or we have found a signature and it is valid
633 [ # # ][ # # ]: 0 : if (data.signatures.count(CPubKey(pubkey).GetID()) || extractor_checker.CheckECDSASignature(sig, pubkey, next_script, sigversion)) {
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
634 : 0 : last_success_key = i + 1;
635 : 0 : break;
636 : : }
637 : 0 : }
638 : : }
639 : 0 : }
640 : :
641 : 0 : return data;
642 [ # # ]: 0 : }
643 : :
644 : 0 : void UpdateInput(CTxIn& input, const SignatureData& data)
645 : : {
646 : 0 : input.scriptSig = data.scriptSig;
647 : 0 : input.scriptWitness = data.scriptWitness;
648 : 0 : }
649 : :
650 : 0 : void SignatureData::MergeSignatureData(SignatureData sigdata)
651 : : {
652 [ # # ]: 0 : if (complete) return;
653 [ # # ]: 0 : if (sigdata.complete) {
654 : 0 : *this = std::move(sigdata);
655 : 0 : return;
656 : : }
657 [ # # ][ # # ]: 0 : if (redeem_script.empty() && !sigdata.redeem_script.empty()) {
658 : 0 : redeem_script = sigdata.redeem_script;
659 : 0 : }
660 [ # # ][ # # ]: 0 : if (witness_script.empty() && !sigdata.witness_script.empty()) {
661 : 0 : witness_script = sigdata.witness_script;
662 : 0 : }
663 : 0 : signatures.insert(std::make_move_iterator(sigdata.signatures.begin()), std::make_move_iterator(sigdata.signatures.end()));
664 : 0 : }
665 : :
666 : 0 : bool SignSignature(const SigningProvider &provider, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, const CAmount& amount, int nHashType, SignatureData& sig_data)
667 : : {
668 [ # # ]: 0 : assert(nIn < txTo.vin.size());
669 : :
670 : 0 : MutableTransactionSignatureCreator creator(txTo, nIn, amount, nHashType);
671 : :
672 [ # # ]: 0 : bool ret = ProduceSignature(provider, creator, fromPubKey, sig_data);
673 [ # # ][ # # ]: 0 : UpdateInput(txTo.vin.at(nIn), sig_data);
674 : 0 : return ret;
675 : 0 : }
676 : :
677 : 0 : bool SignSignature(const SigningProvider &provider, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType, SignatureData& sig_data)
678 : : {
679 [ # # ]: 0 : assert(nIn < txTo.vin.size());
680 : 0 : const CTxIn& txin = txTo.vin[nIn];
681 [ # # ]: 0 : assert(txin.prevout.n < txFrom.vout.size());
682 : 0 : const CTxOut& txout = txFrom.vout[txin.prevout.n];
683 : :
684 : 0 : return SignSignature(provider, txout.scriptPubKey, txTo, nIn, txout.nValue, nHashType, sig_data);
685 : : }
686 : :
687 : : namespace {
688 : : /** Dummy signature checker which accepts all signatures. */
689 : 0 : class DummySignatureChecker final : public BaseSignatureChecker
690 : : {
691 : : public:
692 : 2 : DummySignatureChecker() = default;
693 : 0 : bool CheckECDSASignature(const std::vector<unsigned char>& sig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const override { return sig.size() != 0; }
694 : 0 : bool CheckSchnorrSignature(Span<const unsigned char> sig, Span<const unsigned char> pubkey, SigVersion sigversion, ScriptExecutionData& execdata, ScriptError* serror) const override { return sig.size() != 0; }
695 : 0 : bool CheckLockTime(const CScriptNum& nLockTime) const override { return true; }
696 : 0 : bool CheckSequence(const CScriptNum& nSequence) const override { return true; }
697 : : };
698 : : }
699 : :
700 : 2 : const BaseSignatureChecker& DUMMY_CHECKER = DummySignatureChecker();
701 : :
702 : : namespace {
703 : 0 : class DummySignatureCreator final : public BaseSignatureCreator {
704 : : private:
705 : : char m_r_len = 32;
706 : : char m_s_len = 32;
707 : : public:
708 : 4 : DummySignatureCreator(char r_len, char s_len) : m_r_len(r_len), m_s_len(s_len) {}
709 : 0 : const BaseSignatureChecker& Checker() const override { return DUMMY_CHECKER; }
710 : 0 : bool CreateSig(const SigningProvider& provider, std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const override
711 : : {
712 : : // Create a dummy signature that is a valid DER-encoding
713 : 0 : vchSig.assign(m_r_len + m_s_len + 7, '\000');
714 : 0 : vchSig[0] = 0x30;
715 : 0 : vchSig[1] = m_r_len + m_s_len + 4;
716 : 0 : vchSig[2] = 0x02;
717 : 0 : vchSig[3] = m_r_len;
718 : 0 : vchSig[4] = 0x01;
719 : 0 : vchSig[4 + m_r_len] = 0x02;
720 : 0 : vchSig[5 + m_r_len] = m_s_len;
721 : 0 : vchSig[6 + m_r_len] = 0x01;
722 : 0 : vchSig[6 + m_r_len + m_s_len] = SIGHASH_ALL;
723 : 0 : return true;
724 : : }
725 : 0 : bool CreateSchnorrSig(const SigningProvider& provider, std::vector<unsigned char>& sig, const XOnlyPubKey& pubkey, const uint256* leaf_hash, const uint256* tweak, SigVersion sigversion) const override
726 : : {
727 : 0 : sig.assign(64, '\000');
728 : 0 : return true;
729 : : }
730 : : };
731 : :
732 : : }
733 : :
734 : 2 : const BaseSignatureCreator& DUMMY_SIGNATURE_CREATOR = DummySignatureCreator(32, 32);
735 : 2 : const BaseSignatureCreator& DUMMY_MAXIMUM_SIGNATURE_CREATOR = DummySignatureCreator(33, 32);
736 : :
737 : 0 : bool IsSegWitOutput(const SigningProvider& provider, const CScript& script)
738 : : {
739 : : int version;
740 : 0 : valtype program;
741 [ # # ][ # # ]: 0 : if (script.IsWitnessProgram(version, program)) return true;
742 [ # # ][ # # ]: 0 : if (script.IsPayToScriptHash()) {
743 : 0 : std::vector<valtype> solutions;
744 [ # # ]: 0 : auto whichtype = Solver(script, solutions);
745 [ # # ]: 0 : if (whichtype == TxoutType::SCRIPTHASH) {
746 [ # # ][ # # ]: 0 : auto h160 = uint160(solutions[0]);
747 [ # # ]: 0 : CScript subscript;
748 [ # # ][ # # ]: 0 : if (provider.GetCScript(CScriptID{h160}, subscript)) {
[ # # ]
749 [ # # ][ # # ]: 0 : if (subscript.IsWitnessProgram(version, program)) return true;
750 : 0 : }
751 [ # # ]: 0 : }
752 [ # # ]: 0 : }
753 : 0 : return false;
754 : 0 : }
755 : :
756 : 0 : bool SignTransaction(CMutableTransaction& mtx, const SigningProvider* keystore, const std::map<COutPoint, Coin>& coins, int nHashType, std::map<int, bilingual_str>& input_errors)
757 : : {
758 : 0 : bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);
759 : :
760 : : // Use CTransaction for the constant parts of the
761 : : // transaction to avoid rehashing.
762 : 0 : const CTransaction txConst(mtx);
763 : :
764 [ # # ]: 0 : PrecomputedTransactionData txdata;
765 : 0 : std::vector<CTxOut> spent_outputs;
766 [ # # ]: 0 : for (unsigned int i = 0; i < mtx.vin.size(); ++i) {
767 : 0 : CTxIn& txin = mtx.vin[i];
768 [ # # ]: 0 : auto coin = coins.find(txin.prevout);
769 [ # # ][ # # ]: 0 : if (coin == coins.end() || coin->second.IsSpent()) {
[ # # ]
770 [ # # ]: 0 : txdata.Init(txConst, /*spent_outputs=*/{}, /*force=*/true);
771 : 0 : break;
772 : : } else {
773 [ # # ]: 0 : spent_outputs.emplace_back(coin->second.out.nValue, coin->second.out.scriptPubKey);
774 : : }
775 : 0 : }
776 [ # # ]: 0 : if (spent_outputs.size() == mtx.vin.size()) {
777 [ # # ]: 0 : txdata.Init(txConst, std::move(spent_outputs), true);
778 : 0 : }
779 : :
780 : : // Sign what we can:
781 [ # # ]: 0 : for (unsigned int i = 0; i < mtx.vin.size(); ++i) {
782 : 0 : CTxIn& txin = mtx.vin[i];
783 [ # # ]: 0 : auto coin = coins.find(txin.prevout);
784 [ # # ][ # # ]: 0 : if (coin == coins.end() || coin->second.IsSpent()) {
[ # # ]
785 [ # # ][ # # ]: 0 : input_errors[i] = _("Input not found or already spent");
786 : 0 : continue;
787 : : }
788 : 0 : const CScript& prevPubKey = coin->second.out.scriptPubKey;
789 : 0 : const CAmount& amount = coin->second.out.nValue;
790 : :
791 [ # # ]: 0 : SignatureData sigdata = DataFromTransaction(mtx, i, coin->second.out);
792 : : // Only sign SIGHASH_SINGLE if there's a corresponding output:
793 [ # # ]: 0 : if (!fHashSingle || (i < mtx.vout.size())) {
794 [ # # ][ # # ]: 0 : ProduceSignature(*keystore, MutableTransactionSignatureCreator(mtx, i, amount, &txdata, nHashType), prevPubKey, sigdata);
795 : 0 : }
796 : :
797 [ # # ]: 0 : UpdateInput(txin, sigdata);
798 : :
799 : : // amount must be specified for valid segwit signature
800 [ # # ][ # # ]: 0 : if (amount == MAX_MONEY && !txin.scriptWitness.IsNull()) {
[ # # ]
801 [ # # ][ # # ]: 0 : input_errors[i] = _("Missing amount");
802 : 0 : continue;
803 : : }
804 : :
805 : 0 : ScriptError serror = SCRIPT_ERR_OK;
806 [ # # ][ # # ]: 0 : if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount, txdata, MissingDataBehavior::FAIL), &serror)) {
[ # # ]
807 [ # # ]: 0 : if (serror == SCRIPT_ERR_INVALID_STACK_OPERATION) {
808 : : // Unable to sign input and verification failed (possible attempt to partially sign).
809 [ # # ][ # # ]: 0 : input_errors[i] = Untranslated("Unable to sign input, invalid stack size (possibly missing key)");
[ # # ]
810 [ # # ]: 0 : } else if (serror == SCRIPT_ERR_SIG_NULLFAIL) {
811 : : // Verification failed (possibly due to insufficient signatures).
812 [ # # ][ # # ]: 0 : input_errors[i] = Untranslated("CHECK(MULTI)SIG failing with non-zero signature (possibly need more signatures)");
[ # # ]
813 : 0 : } else {
814 [ # # ][ # # ]: 0 : input_errors[i] = Untranslated(ScriptErrorString(serror));
[ # # ]
815 : : }
816 : 0 : } else {
817 : : // If this input succeeds, make sure there is no error set for it
818 [ # # ]: 0 : input_errors.erase(i);
819 : : }
820 [ # # # ]: 0 : }
821 : 0 : return input_errors.empty();
822 : 0 : }
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