Add zcash_script V5 functions
Co-authored-by: Jack Grigg <jack@z.cash>
This commit is contained in:
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24fb0c97df
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@ -127,6 +127,39 @@ void* zcash_script_new_precomputed_tx(
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}
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}
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void* zcash_script_new_precomputed_tx_v5(
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const unsigned char* txTo,
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unsigned int txToLen,
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const unsigned char* allPrevOutputs,
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unsigned int allPrevOutputsLen,
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zcash_script_error* err)
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{
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try {
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TxInputStream stream(SER_NETWORK, PROTOCOL_VERSION, txTo, txToLen);
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CTransaction tx;
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stream >> tx;
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if (GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION) != txToLen) {
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set_error(err, zcash_script_ERR_TX_SIZE_MISMATCH);
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return nullptr;
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}
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try {
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auto preTx = new PrecomputedTransaction(tx, allPrevOutputs, allPrevOutputsLen);
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// Deserializing the tx did not error.
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set_error(err, zcash_script_ERR_OK);
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return preTx;
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} catch (const std::exception&) {
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// We had some error when parsing allPrevOutputs inside the
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// PrecomputedTransactionData constructor.
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set_error(err, zcash_script_ERR_ALL_PREV_OUTPUTS_DESERIALIZE);
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return nullptr;
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}
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} catch (const std::exception&) {
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set_error(err, zcash_script_ERR_TX_DESERIALIZE); // Error deserializing
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return nullptr;
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}
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}
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void zcash_script_free_precomputed_tx(void* pre_preTx)
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{
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PrecomputedTransaction* preTx = static_cast<PrecomputedTransaction*>(pre_preTx);
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@ -196,6 +229,53 @@ int zcash_script_verify(
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}
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}
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int zcash_script_verify_v5(
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const unsigned char* txTo,
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unsigned int txToLen,
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const unsigned char* allPrevOutputs,
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unsigned int allPrevOutputsLen,
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unsigned int nIn,
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unsigned int flags,
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uint32_t consensusBranchId,
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zcash_script_error* err)
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{
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try {
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TxInputStream stream(SER_NETWORK, PROTOCOL_VERSION, txTo, txToLen);
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CTransaction tx;
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stream >> tx;
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if (nIn >= tx.vin.size())
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return set_error(err, zcash_script_ERR_TX_INDEX);
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if (GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION) != txToLen)
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return set_error(err, zcash_script_ERR_TX_SIZE_MISMATCH);
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// TODO: we can swap this second deserialization for an FFI call by
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// fetching this through PrecomputedTransactionData. Simplicity for now.
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CDataStream sAllPrevOutputs(
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reinterpret_cast<const char*>(allPrevOutputs),
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reinterpret_cast<const char*>(allPrevOutputs + allPrevOutputsLen),
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SER_NETWORK,
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PROTOCOL_VERSION);
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std::vector<CTxOut> prevOutputs;
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sAllPrevOutputs >> prevOutputs;
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if (!(tx.IsCoinBase() ? prevOutputs.empty() : tx.vin.size() == prevOutputs.size())) {
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return set_error(err, zcash_script_ERR_ALL_PREV_OUTPUTS_SIZE_MISMATCH);
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}
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// Regardless of the verification result, the tx did not error.
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set_error(err, zcash_script_ERR_OK);
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PrecomputedTransactionData txdata(tx, allPrevOutputs, allPrevOutputsLen);
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return VerifyScript(
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tx.vin[nIn].scriptSig,
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prevOutputs[nIn].scriptPubKey,
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flags,
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TransactionSignatureChecker(&tx, txdata, nIn, prevOutputs[nIn].nValue),
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consensusBranchId,
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NULL);
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} catch (const std::exception&) {
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return set_error(err, zcash_script_ERR_TX_DESERIALIZE); // Error deserializing
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}
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}
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unsigned int zcash_script_legacy_sigop_count_precomputed(
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const void* pre_preTx,
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zcash_script_error* err)
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@ -33,7 +33,7 @@
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extern "C" {
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#endif
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#define ZCASH_SCRIPT_API_VER 2
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#define ZCASH_SCRIPT_API_VER 3
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typedef enum zcash_script_error_t
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{
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@ -43,6 +43,8 @@ typedef enum zcash_script_error_t
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zcash_script_ERR_TX_DESERIALIZE,
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// Defined since API version 3.
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zcash_script_ERR_TX_VERSION,
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zcash_script_ERR_ALL_PREV_OUTPUTS_SIZE_MISMATCH,
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zcash_script_ERR_ALL_PREV_OUTPUTS_DESERIALIZE,
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} zcash_script_error;
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/** Script verification flags */
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@ -70,6 +72,27 @@ void* zcash_script_new_precomputed_tx(
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unsigned int txToLen,
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zcash_script_error* err);
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/// Deserializes the given transaction and precomputes values to improve
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/// script verification performance. Must be used for V5 transactions;
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/// may also be used for previous versions.
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///
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/// allPrevOutputs must point to the encoding of the vector of all outputs
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/// from previous transactions that are spent by the inputs of the given transaction.
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/// The outputs must be encoded as specified by Bitcoin. The full encoding will thus
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/// consist of a CompactSize prefix containing the number of outputs, followed by
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/// the concatenated outputs, each of them encoded as (value, CompactSize, pk_script).
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///
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/// Returns a pointer to the precomputed transaction. Free this with
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/// zcash_script_free_precomputed_tx once you are done.
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///
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/// If not NULL, err will contain an error/success code for the operation.
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void* zcash_script_new_precomputed_tx_v5(
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const unsigned char* txTo,
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unsigned int txToLen,
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const unsigned char* allPrevOutputs,
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unsigned int allPrevOutputsLen,
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zcash_script_error* err);
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/// Frees a precomputed transaction previously created with
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/// zcash_script_new_precomputed_tx.
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void zcash_script_free_precomputed_tx(void* preTx);
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@ -108,6 +131,30 @@ EXPORT_SYMBOL int zcash_script_verify(
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uint32_t consensusBranchId,
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zcash_script_error* err);
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/// Returns 1 if the input nIn of the serialized transaction pointed to by
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/// txTo correctly spends the matching output in allPrevOutputs under
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/// the additional constraints specified by flags. Must be used for V5 transactions;
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/// may also be used for previous versions.
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///
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/// allPrevOutputs must point to the encoding of the vector of all outputs
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/// from previous transactions that are spent by the inputs of the given transaction.
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/// The outputs must be encoded as specified by Bitcoin. The full encoding will thus
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/// consist of a CompactSize prefix containing the number of outputs, followed by
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/// the concatenated outputs, each of them encoded as (value, CompactSize, pk_script).
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///
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/// If not NULL, err will contain an error/success code for the operation.
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/// Note that script verification failure is indicated by err being set to
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/// zcash_script_ERR_OK and a return value of 0.
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EXPORT_SYMBOL int zcash_script_verify_v5(
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const unsigned char* txTo,
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unsigned int txToLen,
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const unsigned char* allPrevOutputs,
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unsigned int allPrevOutputsLen,
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unsigned int nIn,
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unsigned int flags,
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uint32_t consensusBranchId,
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zcash_script_error* err);
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/// Returns the number of transparent signature operations in the
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/// transparent inputs and outputs of the precomputed transaction
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/// pointed to by preTx.
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