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// Copyright (c) 2009-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <script/interpreter.h>
#include <streams.h>
#include <version.h>
#include <test/fuzz/fuzz.h>
/** Flags that are not forbidden by an assert */
static bool IsValidFlagCombination(unsigned flags);
void test_one_input(const std::vector<uint8_t>& buffer)
{
CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
try {
int nVersion;
ds >> nVersion;
ds.SetVersion(nVersion);
} catch (const std::ios_base::failure&) {
return;
}
try {
const CTransaction tx(deserialize, ds);
const PrecomputedTransactionData txdata(tx);
unsigned int verify_flags;
ds >> verify_flags;
if (!IsValidFlagCombination(verify_flags)) return;
unsigned int fuzzed_flags;
ds >> fuzzed_flags;
for (unsigned i = 0; i < tx.vin.size(); ++i) {
CTxOut prevout;
ds >> prevout;
const TransactionSignatureChecker checker{&tx, i, prevout.nValue, txdata};
ScriptError serror;
const bool ret = VerifyScript(tx.vin.at(i).scriptSig, prevout.scriptPubKey, &tx.vin.at(i).scriptWitness, verify_flags, checker, &serror);
assert(ret == (serror == SCRIPT_ERR_OK));
// Verify that removing flags from a passing test or adding flags to a failing test does not change the result
if (ret) {
verify_flags &= ~fuzzed_flags;
} else {
verify_flags |= fuzzed_flags;
}
if (!IsValidFlagCombination(verify_flags)) return;
ScriptError serror_fuzzed;
const bool ret_fuzzed = VerifyScript(tx.vin.at(i).scriptSig, prevout.scriptPubKey, &tx.vin.at(i).scriptWitness, verify_flags, checker, &serror_fuzzed);
assert(ret_fuzzed == (serror_fuzzed == SCRIPT_ERR_OK));
assert(ret_fuzzed == ret);
}
} catch (const std::ios_base::failure&) {
return;
}
}
static bool IsValidFlagCombination(unsigned flags)
{
if (flags & SCRIPT_VERIFY_CLEANSTACK && ~flags & (SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS)) return false;
if (flags & SCRIPT_VERIFY_WITNESS && ~flags & SCRIPT_VERIFY_P2SH) return false;
return true;
}
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