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238 lines (196 loc) · 8.19 KB
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// 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 "SegwitAddress.h"
#include "Transaction.h"
#include "../BinaryCoding.h"
#include "../Hash.h"
#include <TrustWalletCore/TWBitcoin.h>
#include <cassert>
using namespace TW::Bitcoin;
std::vector<uint8_t> Transaction::getPreImage(const Script& scriptCode, size_t index,
enum TWBitcoinSigHashType hashType, uint64_t amount) const {
assert(index < inputs.size());
auto data = std::vector<uint8_t>{};
// Version
encode32LE(version, data);
// Input prevouts (none/all, depending on flags)
if ((hashType & TWBitcoinSigHashTypeAnyoneCanPay) == 0) {
auto hashPrevouts = getPrevoutHash();
std::copy(std::begin(hashPrevouts), std::end(hashPrevouts), std::back_inserter(data));
} else {
std::fill_n(back_inserter(data), 32, 0);
}
// Input nSequence (none/all, depending on flags)
if ((hashType & TWBitcoinSigHashTypeAnyoneCanPay) == 0 &&
!TWBitcoinSigHashTypeIsSingle(hashType) && !TWBitcoinSigHashTypeIsNone(hashType)) {
auto hashSequence = getSequenceHash();
std::copy(std::begin(hashSequence), std::end(hashSequence), std::back_inserter(data));
} else {
std::fill_n(back_inserter(data), 32, 0);
}
// The input being signed (replacing the scriptSig with scriptCode + amount)
// The prevout may already be contained in hashPrevout, and the nSequence
// may already be contain in hashSequence.
reinterpret_cast<const TW::Bitcoin::OutPoint&>(inputs[index].previousOutput).encode(data);
scriptCode.encode(data);
encode64LE(amount, data);
encode32LE(inputs[index].sequence, data);
// Outputs (none/one/all, depending on flags)
if (!TWBitcoinSigHashTypeIsSingle(hashType) && !TWBitcoinSigHashTypeIsNone(hashType)) {
auto hashOutputs = getOutputsHash();
copy(begin(hashOutputs), end(hashOutputs), back_inserter(data));
} else if (TWBitcoinSigHashTypeIsSingle(hashType) && index < outputs.size()) {
auto outputData = std::vector<uint8_t>{};
outputs[index].encode(outputData);
auto hashOutputs = TW::Hash::hash(hasher, outputData);
copy(begin(hashOutputs), end(hashOutputs), back_inserter(data));
} else {
fill_n(back_inserter(data), 32, 0);
}
// Locktime
encode32LE(lockTime, data);
// Sighash type
encode32LE(hashType, data);
return data;
}
std::vector<uint8_t> Transaction::getPrevoutHash() const {
auto data = std::vector<uint8_t>{};
for (auto& input : inputs) {
auto& outpoint = reinterpret_cast<const TW::Bitcoin::OutPoint&>(input.previousOutput);
outpoint.encode(data);
}
auto hash = TW::Hash::hash(hasher, data);
return hash;
}
std::vector<uint8_t> Transaction::getSequenceHash() const {
auto data = std::vector<uint8_t>{};
for (auto& input : inputs) {
encode32LE(input.sequence, data);
}
auto hash = TW::Hash::hash(hasher, data);
return hash;
}
std::vector<uint8_t> Transaction::getOutputsHash() const {
auto data = std::vector<uint8_t>{};
for (auto& output : outputs) {
output.encode(data);
}
auto hash = TW::Hash::hash(hasher, data);
return hash;
}
void Transaction::encode(bool witness, std::vector<uint8_t>& data) const {
encode32LE(version, data);
if (witness) {
// Use extended format in case witnesses are to be serialized.
data.push_back(0);
data.push_back(1);
}
encodeVarInt(inputs.size(), data);
for (auto& input : inputs) {
input.encode(data);
}
encodeVarInt(outputs.size(), data);
for (auto& output : outputs) {
output.encode(data);
}
if (witness) {
for (auto& input : inputs) {
input.encodeWitness(data);
}
}
encode32LE(lockTime, data);
}
std::vector<uint8_t> Transaction::getSignatureHash(const Script& scriptCode, size_t index,
enum TWBitcoinSigHashType hashType, uint64_t amount,
TWBitcoinSignatureVersion version) const {
switch (version) {
case BASE:
return getSignatureHashBase(scriptCode, index, hashType);
case WITNESS_V0:
return getSignatureHashWitnessV0(scriptCode, index, hashType, amount);
}
}
/// Generates the signature hash for Witness version 0 scripts.
std::vector<uint8_t> Transaction::getSignatureHashWitnessV0(const Script& scriptCode, size_t index,
enum TWBitcoinSigHashType hashType,
uint64_t amount) const {
auto preimage = getPreImage(scriptCode, index, hashType, amount);
auto hash = TW::Hash::hash(hasher, preimage);
return hash;
}
/// Generates the signature hash for for scripts other than witness scripts.
std::vector<uint8_t> Transaction::getSignatureHashBase(const Script& scriptCode, size_t index,
enum TWBitcoinSigHashType hashType) const {
assert(index < inputs.size());
auto data = std::vector<uint8_t>{};
encode32LE(version, data);
auto serializedInputCount =
(hashType & TWBitcoinSigHashTypeAnyoneCanPay) != 0 ? 1 : inputs.size();
encodeVarInt(serializedInputCount, data);
for (auto subindex = 0; subindex < serializedInputCount; subindex += 1) {
serializeInput(subindex, scriptCode, index, hashType, data);
}
auto hashNone = (hashType & 0x1f) == TWBitcoinSigHashTypeNone;
auto hashSingle = (hashType & 0x1f) == TWBitcoinSigHashTypeSingle;
auto serializedOutputCount = hashNone ? 0 : (hashSingle ? index + 1 : outputs.size());
encodeVarInt(serializedOutputCount, data);
for (auto subindex = 0; subindex < serializedOutputCount; subindex += 1) {
if (hashSingle && subindex != index) {
auto output = TransactionOutput(-1, {});
output.encode(data);
} else {
outputs[subindex].encode(data);
}
}
// Locktime
encode32LE(lockTime, data);
// Sighash type
encode32LE(hashType, data);
auto hash = TW::Hash::hash(hasher, data);
return hash;
}
void Transaction::serializeInput(size_t subindex, const Script& scriptCode, size_t index,
enum TWBitcoinSigHashType hashType, std::vector<uint8_t>& data) const {
// In case of SIGHASH_ANYONECANPAY, only the input being signed is
// serialized
if ((hashType & TWBitcoinSigHashTypeAnyoneCanPay) != 0) {
subindex = index;
}
reinterpret_cast<const TW::Bitcoin::OutPoint&>(inputs[subindex].previousOutput).encode(data);
// Serialize the script
if (subindex != index) {
encodeVarInt(0, data);
} else {
scriptCode.encode(data);
}
// Serialize the nSequence
auto hashNone = (hashType & 0x1f) == TWBitcoinSigHashTypeNone;
auto hashSingle = (hashType & 0x1f) == TWBitcoinSigHashTypeSingle;
if (subindex != index && (hashSingle || hashNone)) {
encode32LE(0, data);
} else {
encode32LE(inputs[subindex].sequence, data);
}
}
Proto::Transaction Transaction::proto() const {
auto protoTx = Proto::Transaction();
protoTx.set_version(version);
protoTx.set_locktime(lockTime);
for (const auto& input : inputs) {
auto protoInput = protoTx.add_inputs();
protoInput->mutable_previousoutput()->set_hash(input.previousOutput.hash.data(),
input.previousOutput.hash.size());
protoInput->mutable_previousoutput()->set_index(input.previousOutput.index);
protoInput->set_sequence(input.sequence);
protoInput->set_script(input.script.bytes.data(), input.script.bytes.size());
}
for (const auto& output : outputs) {
auto protoOutput = protoTx.add_outputs();
protoOutput->set_value(output.value);
protoOutput->set_script(output.script.bytes.data(), output.script.bytes.size());
}
return protoTx;
}