mirror of https://github.com/bitcoin/bitcoin
124 lines
4.2 KiB
C++
124 lines
4.2 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <script/bitcoinconsensus.h>
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#include <primitives/transaction.h>
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#include <pubkey.h>
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#include <script/interpreter.h>
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#include <version.h>
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namespace {
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/** A class that deserializes a single CTransaction one time. */
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class TxInputStream
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{
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public:
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TxInputStream(int nVersionIn, const unsigned char *txTo, size_t txToLen) :
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m_version(nVersionIn),
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m_data(txTo),
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m_remaining(txToLen)
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{}
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void read(Span<std::byte> dst)
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{
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if (dst.size() > m_remaining) {
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throw std::ios_base::failure(std::string(__func__) + ": end of data");
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}
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if (dst.data() == nullptr) {
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throw std::ios_base::failure(std::string(__func__) + ": bad destination buffer");
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}
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if (m_data == nullptr) {
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throw std::ios_base::failure(std::string(__func__) + ": bad source buffer");
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}
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memcpy(dst.data(), m_data, dst.size());
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m_remaining -= dst.size();
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m_data += dst.size();
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}
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template<typename T>
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TxInputStream& operator>>(T&& obj)
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{
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::Unserialize(*this, obj);
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return *this;
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}
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int GetVersion() const { return m_version; }
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private:
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const int m_version;
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const unsigned char* m_data;
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size_t m_remaining;
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};
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inline int set_error(bitcoinconsensus_error* ret, bitcoinconsensus_error serror)
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{
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if (ret)
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*ret = serror;
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return 0;
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}
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} // namespace
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/** Check that all specified flags are part of the libconsensus interface. */
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static bool verify_flags(unsigned int flags)
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{
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return (flags & ~(bitcoinconsensus_SCRIPT_FLAGS_VERIFY_ALL)) == 0;
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}
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static int verify_script(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen, CAmount amount,
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const unsigned char *txTo , unsigned int txToLen,
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unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err)
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{
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if (!verify_flags(flags)) {
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return set_error(err, bitcoinconsensus_ERR_INVALID_FLAGS);
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}
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try {
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TxInputStream stream(PROTOCOL_VERSION, txTo, txToLen);
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CTransaction tx(deserialize, stream);
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if (nIn >= tx.vin.size())
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return set_error(err, bitcoinconsensus_ERR_TX_INDEX);
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if (GetSerializeSize(tx, PROTOCOL_VERSION) != txToLen)
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return set_error(err, bitcoinconsensus_ERR_TX_SIZE_MISMATCH);
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// Regardless of the verification result, the tx did not error.
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set_error(err, bitcoinconsensus_ERR_OK);
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PrecomputedTransactionData txdata(tx);
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return VerifyScript(tx.vin[nIn].scriptSig, CScript(scriptPubKey, scriptPubKey + scriptPubKeyLen), &tx.vin[nIn].scriptWitness, flags, TransactionSignatureChecker(&tx, nIn, amount, txdata, MissingDataBehavior::FAIL), nullptr);
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} catch (const std::exception&) {
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return set_error(err, bitcoinconsensus_ERR_TX_DESERIALIZE); // Error deserializing
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}
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}
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int bitcoinconsensus_verify_script_with_amount(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen, int64_t amount,
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const unsigned char *txTo , unsigned int txToLen,
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unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err)
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{
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CAmount am(amount);
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return ::verify_script(scriptPubKey, scriptPubKeyLen, am, txTo, txToLen, nIn, flags, err);
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}
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int bitcoinconsensus_verify_script(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen,
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const unsigned char *txTo , unsigned int txToLen,
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unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err)
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{
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if (flags & bitcoinconsensus_SCRIPT_FLAGS_VERIFY_WITNESS) {
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return set_error(err, bitcoinconsensus_ERR_AMOUNT_REQUIRED);
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}
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CAmount am(0);
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return ::verify_script(scriptPubKey, scriptPubKeyLen, am, txTo, txToLen, nIn, flags, err);
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}
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unsigned int bitcoinconsensus_version()
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{
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// Just use the API version for now
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return BITCOINCONSENSUS_API_VER;
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}
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