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lib: add Taproot support to libconsensus

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Co-authored-by: Bruno Garcia <brunoely.gc@gmail.com>
This commit is contained in:
Jake Rawsthorne
2021-02-14 23:09:15 +00:00
committed by brunoerg
parent 73dfa6da08
commit fb0db07e41
3 changed files with 122 additions and 4 deletions
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42
src/script/bitcoinconsensus.cpp
View File

@@ -72,14 +72,34 @@ static bool verify_flags(unsigned int flags)
static int verify_script(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen, CAmount amount,
const unsigned char *txTo , unsigned int txToLen,
const UTXO *spentOutputs, unsigned int spentOutputsLen,
unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err)
{
if (!verify_flags(flags)) {
return set_error(err, bitcoinconsensus_ERR_INVALID_FLAGS);
}
if (flags & bitcoinconsensus_SCRIPT_FLAGS_VERIFY_TAPROOT && spentOutputs == nullptr) {
return set_error(err, bitcoinconsensus_ERR_SPENT_OUTPUTS_REQUIRED);
}
try {
TxInputStream stream(PROTOCOL_VERSION, txTo, txToLen);
CTransaction tx(deserialize, stream);
std::vector<CTxOut> spent_outputs;
if (spentOutputs != nullptr) {
if (spentOutputsLen != tx.vin.size()) {
return set_error(err, bitcoinconsensus_ERR_SPENT_OUTPUTS_MISMATCH);
}
for (size_t i = 0; i < spentOutputsLen; i++) {
CScript spk = CScript(spentOutputs[i].scriptPubKey, spentOutputs[i].scriptPubKey + spentOutputs[i].scriptPubKeySize);
const CAmount& value = spentOutputs[i].value;
CTxOut tx_out = CTxOut(value, spk);
spent_outputs.push_back(tx_out);
}
}
if (nIn >= tx.vin.size())
return set_error(err, bitcoinconsensus_ERR_TX_INDEX);
if (GetSerializeSize(tx, PROTOCOL_VERSION) != txToLen)
@@ -89,18 +109,34 @@ static int verify_script(const unsigned char *scriptPubKey, unsigned int scriptP
set_error(err, bitcoinconsensus_ERR_OK);
PrecomputedTransactionData txdata(tx);
if (spentOutputs != nullptr && flags & bitcoinconsensus_SCRIPT_FLAGS_VERIFY_TAPROOT) {
txdata.Init(tx, std::move(spent_outputs));
}
return VerifyScript(tx.vin[nIn].scriptSig, CScript(scriptPubKey, scriptPubKey + scriptPubKeyLen), &tx.vin[nIn].scriptWitness, flags, TransactionSignatureChecker(&tx, nIn, amount, txdata, MissingDataBehavior::FAIL), nullptr);
} catch (const std::exception&) {
return set_error(err, bitcoinconsensus_ERR_TX_DESERIALIZE); // Error deserializing
}
}
int bitcoinconsensus_verify_script_with_spent_outputs(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen, int64_t amount,
const unsigned char *txTo , unsigned int txToLen,
const UTXO *spentOutputs, unsigned int spentOutputsLen,
unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err)
{
CAmount am(amount);
return ::verify_script(scriptPubKey, scriptPubKeyLen, am, txTo, txToLen, spentOutputs, spentOutputsLen, nIn, flags, err);
}
int bitcoinconsensus_verify_script_with_amount(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen, int64_t amount,
const unsigned char *txTo , unsigned int txToLen,
unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err)
{
CAmount am(amount);
return ::verify_script(scriptPubKey, scriptPubKeyLen, am, txTo, txToLen, nIn, flags, err);
UTXO *spentOutputs = nullptr;
unsigned int spentOutputsLen = 0;
return ::verify_script(scriptPubKey, scriptPubKeyLen, am, txTo, txToLen, spentOutputs, spentOutputsLen, nIn, flags, err);
}
@@ -113,7 +149,9 @@ int bitcoinconsensus_verify_script(const unsigned char *scriptPubKey, unsigned i
}
CAmount am(0);
return ::verify_script(scriptPubKey, scriptPubKeyLen, am, txTo, txToLen, nIn, flags, err);
UTXO *spentOutputs = nullptr;
unsigned int spentOutputsLen = 0;
return ::verify_script(scriptPubKey, scriptPubKeyLen, am, txTo, txToLen, spentOutputs, spentOutputsLen, nIn, flags, err);
}
unsigned int bitcoinconsensus_version()

19
src/script/bitcoinconsensus.h
View File

@@ -31,7 +31,7 @@
extern "C" {
#endif
#define BITCOINCONSENSUS_API_VER 1
#define BITCOINCONSENSUS_API_VER 2
typedef enum bitcoinconsensus_error_t
{
@@ -41,6 +41,8 @@ typedef enum bitcoinconsensus_error_t
bitcoinconsensus_ERR_TX_DESERIALIZE,
bitcoinconsensus_ERR_AMOUNT_REQUIRED,
bitcoinconsensus_ERR_INVALID_FLAGS,
bitcoinconsensus_ERR_SPENT_OUTPUTS_REQUIRED,
bitcoinconsensus_ERR_SPENT_OUTPUTS_MISMATCH
} bitcoinconsensus_error;
/** Script verification flags */
@@ -53,11 +55,19 @@ enum
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_CHECKLOCKTIMEVERIFY = (1U << 9), // enable CHECKLOCKTIMEVERIFY (BIP65)
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_CHECKSEQUENCEVERIFY = (1U << 10), // enable CHECKSEQUENCEVERIFY (BIP112)
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_WITNESS = (1U << 11), // enable WITNESS (BIP141)
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_TAPROOT = (1U << 17), // enable TAPROOT (BIPs 341 & 342)
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_ALL = bitcoinconsensus_SCRIPT_FLAGS_VERIFY_P2SH | bitcoinconsensus_SCRIPT_FLAGS_VERIFY_DERSIG |
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_NULLDUMMY | bitcoinconsensus_SCRIPT_FLAGS_VERIFY_CHECKLOCKTIMEVERIFY |
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_CHECKSEQUENCEVERIFY | bitcoinconsensus_SCRIPT_FLAGS_VERIFY_WITNESS
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_CHECKSEQUENCEVERIFY | bitcoinconsensus_SCRIPT_FLAGS_VERIFY_WITNESS |
bitcoinconsensus_SCRIPT_FLAGS_VERIFY_TAPROOT
};
typedef struct {
const unsigned char *scriptPubKey;
unsigned int scriptPubKeySize;
int64_t value;
} UTXO;
/// Returns 1 if the input nIn of the serialized transaction pointed to by
/// txTo correctly spends the scriptPubKey pointed to by scriptPubKey under
/// the additional constraints specified by flags.
@@ -70,6 +80,11 @@ EXPORT_SYMBOL int bitcoinconsensus_verify_script_with_amount(const unsigned char
const unsigned char *txTo , unsigned int txToLen,
unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err);
EXPORT_SYMBOL int bitcoinconsensus_verify_script_with_spent_outputs(const unsigned char *scriptPubKey, unsigned int scriptPubKeyLen, int64_t amount,
const unsigned char *txTo , unsigned int txToLen,
const UTXO *spentOutputs, unsigned int spentOutputsLen,
unsigned int nIn, unsigned int flags, bitcoinconsensus_error* err);
EXPORT_SYMBOL unsigned int bitcoinconsensus_version();
#ifdef __cplusplus