forked from trustwallet/wallet-core
-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathSigner.cpp
More file actions
202 lines (180 loc) · 7.49 KB
/
Copy pathSigner.cpp
File metadata and controls
202 lines (180 loc) · 7.49 KB
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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
// Copyright © 2017-2020 Trust Wallet.
//
// This file is part of Trust. The full Trust copyright notice, including
// terms governing use, modification, and redistribution, is contained in the
// file LICENSE at the root of the source code distribution tree.
#include "Signer.h"
#include "TransactionInput.h"
#include "TransactionOutput.h"
#include "../BinaryCoding.h"
#include "../Hash.h"
#include "../HexCoding.h"
#include <TrustWalletCore/TWBitcoinOpCodes.h>
using namespace TW;
using namespace TW::Decred;
Result<Transaction> Signer::sign() {
signedInputs.clear();
std::copy(std::begin(transaction.inputs), std::end(transaction.inputs),
std::back_inserter(signedInputs));
const bool hashSingle =
((input.hash_type() & ~TWBitcoinSigHashTypeAnyoneCanPay) == TWBitcoinSigHashTypeSingle);
for (auto i = 0; i < plan.utxos.size(); i += 1) {
auto& utxo = plan.utxos[i];
// Only sign TWBitcoinSigHashTypeSingle if there's a corresponding output
if (hashSingle && i >= transaction.outputs.size()) {
continue;
}
auto script = Bitcoin::Script(utxo.script().begin(), utxo.script().end());
auto result = sign(script, i);
if (!result) {
return Result<Transaction>::failure(result.error());
}
signedInputs[i].script = result.payload();
}
Transaction tx(transaction);
tx.inputs = move(signedInputs);
tx.outputs = transaction.outputs;
return Result<Transaction>::success(std::move(tx));
}
Result<Bitcoin::Script> Signer::sign(Bitcoin::Script script, size_t index) {
Bitcoin::Script redeemScript;
std::vector<Data> results;
auto result = signStep(script, index);
if (result) {
results = result.payload();
} else {
return Result<Bitcoin::Script>::failure(result.error());
}
auto txin = transaction.inputs[index];
if (script.isPayToScriptHash()) {
script = Bitcoin::Script(results.front().begin(), results.front().end());
auto result = signStep(script, index);
if (!result) {
return Result<Bitcoin::Script>::failure(result.error());
}
results = result.payload();
results.push_back(script.bytes);
redeemScript = script;
results.push_back(redeemScript.bytes);
}
return Result<Bitcoin::Script>::success(Bitcoin::Script(pushAll(results)));
}
Result<std::vector<Data>> Signer::signStep(Bitcoin::Script script, size_t index) {
Transaction transactionToSign(transaction);
transactionToSign.inputs = signedInputs;
transactionToSign.outputs = transaction.outputs;
Data data;
std::vector<Data> keys;
int required;
if (script.matchPayToPubkey(data)) {
auto keyHash = TW::Hash::ripemd(TW::Hash::blake256(data));
auto key = keyForPublicKeyHash(keyHash);
if (key.empty()) {
// Error: Missing key
return Result<std::vector<Data>>::failure("Missing private key.");
}
auto signature = createSignature(transactionToSign, script, key, index);
if (signature.empty()) {
// Error: Failed to sign
return Result<std::vector<Data>>::failure("Failed to sign.");
}
return Result<std::vector<Data>>::success({signature});
} else if (script.matchPayToPubkeyHash(data)) {
auto key = keyForPublicKeyHash(data);
if (key.empty()) {
// Error: Missing keyxs
return Result<std::vector<Data>>::failure("Missing private key.");
}
auto pubkey = PrivateKey(key).getPublicKey(TWPublicKeyTypeSECP256k1);
auto signature = createSignature(transactionToSign, script, key, index);
if (signature.empty()) {
// Error: Failed to sign
return Result<std::vector<Data>>::failure("Failed to sign.");
}
return Result<std::vector<Data>>::success({signature, pubkey.bytes});
} else if (script.matchPayToScriptHash(data)) {
auto redeemScript = scriptForScriptHash(data);
if (redeemScript.empty()) {
// Error: Missing redeem script
return Result<std::vector<Data>>::failure("Missing redeem script.");
}
return Result<std::vector<Data>>::success({redeemScript});
} else if (script.matchMultisig(keys, required)) {
auto results = std::vector<Data>{{}};
for (auto& pubKey : keys) {
if (results.size() >= required + 1) {
break;
}
auto keyHash = TW::Hash::ripemd(TW::Hash::blake256(pubKey));
auto key = keyForPublicKeyHash(keyHash);
if (key.empty()) {
// Error: missing key
return Result<std::vector<Data>>::failure("Missing private key.");
}
auto signature = createSignature(transactionToSign, script, key, index);
if (signature.empty()) {
// Error: Failed to sign
return Result<std::vector<Data>>::failure("Failed to sign.");
}
results.push_back(signature);
}
results.resize(required + 1);
return Result<std::vector<Data>>::success(std::move(results));
} else {
// Error: Invalid output script
return Result<std::vector<Data>>::failure("Invalid output script.");
}
}
Data Signer::createSignature(const Transaction& transaction, const Bitcoin::Script& script,
const Data& key, size_t index) {
auto sighash = transaction.computeSignatureHash(script, index, static_cast<TWBitcoinSigHashType>(input.hash_type()));
auto pk = PrivateKey(key);
auto signature = pk.signAsDER(Data(begin(sighash), end(sighash)), TWCurveSECP256k1);
if (script.empty()) {
return {};
}
signature.push_back(static_cast<uint8_t>(input.hash_type()));
return signature;
}
Data Signer::pushAll(const std::vector<Data>& results) {
auto data = Data{};
for (auto& result : results) {
if (result.empty()) {
data.push_back(OP_0);
} else if (result.size() == 1 && result[0] >= 1 && result[0] <= 16) {
data.push_back(Bitcoin::Script::encodeNumber(result[0]));
} else if (result.size() < OP_PUSHDATA1) {
data.push_back(static_cast<uint8_t>(result.size()));
} else if (result.size() <= 0xff) {
data.push_back(OP_PUSHDATA1);
data.push_back(static_cast<uint8_t>(result.size()));
} else if (result.size() <= 0xffff) {
data.push_back(OP_PUSHDATA2);
encode16LE(static_cast<uint16_t>(result.size()), data);
} else {
data.push_back(OP_PUSHDATA4);
encode32LE(static_cast<uint32_t>(result.size()), data);
}
std::copy(begin(result), end(result), back_inserter(data));
}
return data;
}
Data Signer::keyForPublicKeyHash(const Data& hash) const {
for (auto& key : input.private_key()) {
auto publicKey = PrivateKey(key).getPublicKey(TWPublicKeyTypeSECP256k1);
auto keyHash = TW::Hash::ripemd(TW::Hash::blake256(publicKey.bytes));
if (std::equal(std::begin(keyHash), std::end(keyHash), std::begin(hash), std::end(hash))) {
return Data(key.begin(), key.end());
}
}
return {};
}
Data Signer::scriptForScriptHash(const Data& hash) const {
auto hashString = hex(hash.begin(), hash.end());
auto it = input.scripts().find(hashString);
if (it == input.scripts().end()) {
// Error: Missing redeem script
return {};
}
return Data(it->second.begin(), it->second.end());
}