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-rw-r--r--src/main.h8
-rw-r--r--src/test/sigopcount_tests.cpp177
2 files changed, 185 insertions, 0 deletions
diff --git a/src/main.h b/src/main.h
index 84a6044bc9..2ffe5770dc 100644
--- a/src/main.h
+++ b/src/main.h
@@ -333,6 +333,14 @@ unsigned int GetLegacySigOpCount(const CTransaction& tx);
*/
unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& mapInputs);
+/**
+ * Compute total signature operation cost of a transaction.
+ * @param[in] tx Transaction for which we are computing the cost
+ * @param[in] inputs Map of previous transactions that have outputs we're spending
+ * @param[out] flags Script verification flags
+ * @return Total signature operation cost of tx
+ */
+int64_t GetTransactionSigOpCost(const CTransaction& tx, const CCoinsViewCache& inputs, int flags);
/**
* Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts)
diff --git a/src/test/sigopcount_tests.cpp b/src/test/sigopcount_tests.cpp
index a207fd9216..8dea388332 100644
--- a/src/test/sigopcount_tests.cpp
+++ b/src/test/sigopcount_tests.cpp
@@ -2,6 +2,7 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#include "main.h"
#include "pubkey.h"
#include "key.h"
#include "script/script.h"
@@ -64,4 +65,180 @@ BOOST_AUTO_TEST_CASE(GetSigOpCount)
BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig2), 3U);
}
+/**
+ * Verifies script execution of the zeroth scriptPubKey of tx output and
+ * zeroth scriptSig and witness of tx input.
+ */
+ScriptError VerifyWithFlag(const CTransaction& output, const CMutableTransaction& input, int flags)
+{
+ ScriptError error;
+ CTransaction inputi(input);
+ bool ret = VerifyScript(inputi.vin[0].scriptSig, output.vout[0].scriptPubKey, inputi.wit.vtxinwit.size() > 0 ? &inputi.wit.vtxinwit[0].scriptWitness : NULL, flags, TransactionSignatureChecker(&inputi, 0, output.vout[0].nValue), &error);
+ BOOST_CHECK((ret == true) == (error == SCRIPT_ERR_OK));
+
+ return error;
+}
+
+/**
+ * Builds a creationTx from scriptPubKey and a spendingTx from scriptSig
+ * and witness such that spendingTx spends output zero of creationTx.
+ * Also inserts creationTx's output into the coins view.
+ */
+void BuildTxs(CMutableTransaction& spendingTx, CCoinsViewCache& coins, CMutableTransaction& creationTx, const CScript& scriptPubKey, const CScript& scriptSig, const CTxinWitness& witness)
+{
+ creationTx.nVersion = 1;
+ creationTx.vin.resize(1);
+ creationTx.vin[0].prevout.SetNull();
+ creationTx.vin[0].scriptSig = CScript();
+ creationTx.wit.vtxinwit.resize(1);
+ creationTx.vout.resize(1);
+ creationTx.vout[0].nValue = 1;
+ creationTx.vout[0].scriptPubKey = scriptPubKey;
+
+ spendingTx.nVersion = 1;
+ spendingTx.vin.resize(1);
+ spendingTx.vin[0].prevout.hash = creationTx.GetHash();
+ spendingTx.vin[0].prevout.n = 0;
+ spendingTx.vin[0].scriptSig = scriptSig;
+ spendingTx.wit.vtxinwit.resize(1);
+ spendingTx.wit.vtxinwit[0] = witness;
+ spendingTx.vout.resize(1);
+ spendingTx.vout[0].nValue = 1;
+ spendingTx.vout[0].scriptPubKey = CScript();
+
+ coins.ModifyCoins(creationTx.GetHash())->FromTx(creationTx, 0);
+}
+
+BOOST_AUTO_TEST_CASE(GetTxSigOpCost)
+{
+ // Transaction creates outputs
+ CMutableTransaction creationTx;
+ // Transaction that spends outputs and whose
+ // sig op cost is going to be tested
+ CMutableTransaction spendingTx;
+
+ // Create utxo set
+ CCoinsView coinsDummy;
+ CCoinsViewCache coins(&coinsDummy);
+ // Create key
+ CKey key;
+ key.MakeNewKey(true);
+ CPubKey pubkey = key.GetPubKey();
+ // Default flags
+ int flags = SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH;
+
+ // Multisig script (legacy counting)
+ {
+ CScript scriptPubKey = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
+ // Do not use a valid signature to avoid using wallet operations.
+ CScript scriptSig = CScript() << OP_0 << OP_0;
+
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, CTxinWitness());
+ // Legacy counting only includes signature operations in scriptSigs and scriptPubKeys
+ // of a transaction and does not take the actual executed sig operations into account.
+ // spendingTx in itself does not contain a signature operation.
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
+ // creationTx contains two signature operations in its scriptPubKey, but legacy counting
+ // is not accurate.
+ assert(GetTransactionSigOpCost(CTransaction(creationTx), coins, flags) == MAX_PUBKEYS_PER_MULTISIG * WITNESS_SCALE_FACTOR);
+ // Sanity check: script verification fails because of an invalid signature.
+ assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
+ }
+
+ // Multisig nested in P2SH
+ {
+ CScript redeemScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
+ CScript scriptPubKey = GetScriptForDestination(CScriptID(redeemScript));
+ CScript scriptSig = CScript() << OP_0 << OP_0 << ToByteVector(redeemScript);
+
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, CTxinWitness());
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2 * WITNESS_SCALE_FACTOR);
+ assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
+ }
+
+ // P2WPKH witness program
+ {
+ CScript p2pk = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
+ CScript scriptPubKey = GetScriptForWitness(p2pk);
+ CScript scriptSig = CScript();
+ CTxinWitness witness;
+ CScriptWitness scriptWitness;
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ witness.scriptWitness = scriptWitness;
+
+
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 1);
+ // No signature operations if we don't verify the witness.
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags & ~SCRIPT_VERIFY_WITNESS) == 0);
+ assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_EQUALVERIFY);
+
+ // The sig op cost for witness version != 0 is zero.
+ assert(scriptPubKey[0] == 0x00);
+ scriptPubKey[0] = 0x51;
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
+ scriptPubKey[0] = 0x00;
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
+
+ // The witness of a coinbase transaction is not taken into account.
+ spendingTx.vin[0].prevout.SetNull();
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
+ }
+
+ // P2WPKH nested in P2SH
+ {
+ CScript p2pk = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
+ CScript scriptSig = GetScriptForWitness(p2pk);
+ CScript scriptPubKey = GetScriptForDestination(CScriptID(scriptSig));
+ scriptSig = CScript() << ToByteVector(scriptSig);
+ CTxinWitness witness;
+ CScriptWitness scriptWitness;
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ witness.scriptWitness = scriptWitness;
+
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 1);
+ assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_EQUALVERIFY);
+ }
+
+ // P2WSH witness program
+ {
+ CScript witnessScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
+ CScript scriptPubKey = GetScriptForWitness(witnessScript);
+ CScript scriptSig = CScript();
+ CTxinWitness witness;
+ CScriptWitness scriptWitness;
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ scriptWitness.stack.push_back(vector<unsigned char>(witnessScript.begin(), witnessScript.end()));
+ witness.scriptWitness = scriptWitness;
+
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2);
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags & ~SCRIPT_VERIFY_WITNESS) == 0);
+ assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
+ }
+
+ // P2WSH nested in P2SH
+ {
+ CScript witnessScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
+ CScript redeemScript = GetScriptForWitness(witnessScript);
+ CScript scriptPubKey = GetScriptForDestination(CScriptID(redeemScript));
+ CScript scriptSig = CScript() << ToByteVector(redeemScript);
+ CTxinWitness witness;
+ CScriptWitness scriptWitness;
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ scriptWitness.stack.push_back(vector<unsigned char>(0));
+ scriptWitness.stack.push_back(vector<unsigned char>(witnessScript.begin(), witnessScript.end()));
+ witness.scriptWitness = scriptWitness;
+
+ BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
+ assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2);
+ assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
+ }
+}
+
BOOST_AUTO_TEST_SUITE_END()
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