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// Copyright (c) 2009-2020 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 <pubkey.h>
#include <script/interpreter.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <util/memory.h>
#include <cstdint>
#include <limits>
#include <string>
#include <vector>
void initialize_signature_checker()
{
static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
}
namespace {
class FuzzedSignatureChecker : public BaseSignatureChecker
{
FuzzedDataProvider& m_fuzzed_data_provider;
public:
explicit FuzzedSignatureChecker(FuzzedDataProvider& fuzzed_data_provider) : m_fuzzed_data_provider(fuzzed_data_provider)
{
}
bool CheckECDSASignature(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const override
{
return m_fuzzed_data_provider.ConsumeBool();
}
bool CheckSchnorrSignature(Span<const unsigned char> sig, Span<const unsigned char> pubkey, SigVersion sigversion, const ScriptExecutionData& execdata, ScriptError* serror = nullptr) const override
{
return m_fuzzed_data_provider.ConsumeBool();
}
bool CheckLockTime(const CScriptNum& nLockTime) const override
{
return m_fuzzed_data_provider.ConsumeBool();
}
bool CheckSequence(const CScriptNum& nSequence) const override
{
return m_fuzzed_data_provider.ConsumeBool();
}
virtual ~FuzzedSignatureChecker() {}
};
} // namespace
FUZZ_TARGET_INIT(signature_checker, initialize_signature_checker)
{
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
const unsigned int flags = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
const SigVersion sig_version = fuzzed_data_provider.PickValueInArray({SigVersion::BASE, SigVersion::WITNESS_V0});
const std::string script_string_1 = fuzzed_data_provider.ConsumeRandomLengthString(65536);
const std::vector<uint8_t> script_bytes_1{script_string_1.begin(), script_string_1.end()};
const std::string script_string_2 = fuzzed_data_provider.ConsumeRandomLengthString(65536);
const std::vector<uint8_t> script_bytes_2{script_string_2.begin(), script_string_2.end()};
std::vector<std::vector<unsigned char>> stack;
(void)EvalScript(stack, {script_bytes_1.begin(), script_bytes_1.end()}, flags, FuzzedSignatureChecker(fuzzed_data_provider), sig_version, nullptr);
if ((flags & SCRIPT_VERIFY_CLEANSTACK) != 0 && ((flags & SCRIPT_VERIFY_P2SH) == 0 || (flags & SCRIPT_VERIFY_WITNESS) == 0)) {
return;
}
if ((flags & SCRIPT_VERIFY_WITNESS) != 0 && (flags & SCRIPT_VERIFY_P2SH) == 0) {
return;
}
(void)VerifyScript({script_bytes_1.begin(), script_bytes_1.end()}, {script_bytes_2.begin(), script_bytes_2.end()}, nullptr, flags, FuzzedSignatureChecker(fuzzed_data_provider), nullptr);
}
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