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[SMTChecker] Support crypto functions in CHC

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This commit is contained in:
Leonardo Alt
2020-10-16 14:57:13 +01:00
parent 25b10b9643
commit 54f76e081a
22 changed files with 308 additions and 51 deletions
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libsolidity/formal/SMTEncoder.cpp
+33
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@@ -633,6 +633,7 @@ void SMTEncoder::endVisit(FunctionCall const& _funCall)
case FunctionType::Kind::ECRecover:
case FunctionType::Kind::SHA256:
case FunctionType::Kind::RIPEMD160:
visitCryptoFunction(_funCall);
break;
case FunctionType::Kind::BlockHash:
defineExpr(_funCall, m_context.state().blockhash(expr(*_funCall.arguments().at(0))));
@@ -730,6 +731,38 @@ void SMTEncoder::visitRequire(FunctionCall const& _funCall)
addPathImpliedExpression(expr(*args.front()));
}
void SMTEncoder::visitCryptoFunction(FunctionCall const& _funCall)
{
auto const& funType = dynamic_cast<FunctionType const&>(*_funCall.expression().annotation().type);
auto kind = funType.kind();
auto arg0 = expr(*_funCall.arguments().at(0));
optional<smtutil::Expression> result;
if (kind == FunctionType::Kind::KECCAK256)
result = smtutil::Expression::select(m_context.state().cryptoFunction("keccak256"), arg0);
else if (kind == FunctionType::Kind::SHA256)
result = smtutil::Expression::select(m_context.state().cryptoFunction("sha256"), arg0);
else if (kind == FunctionType::Kind::RIPEMD160)
result = smtutil::Expression::select(m_context.state().cryptoFunction("ripemd160"), arg0);
else if (kind == FunctionType::Kind::ECRecover)
{
auto e = m_context.state().cryptoFunction("ecrecover");
auto arg0 = expr(*_funCall.arguments().at(0));
auto arg1 = expr(*_funCall.arguments().at(1));
auto arg2 = expr(*_funCall.arguments().at(2));
auto arg3 = expr(*_funCall.arguments().at(3));
auto inputSort = dynamic_cast<smtutil::ArraySort&>(*e.sort).domain;
auto ecrecoverInput = smtutil::Expression::tuple_constructor(
smtutil::Expression(make_shared<smtutil::SortSort>(inputSort), ""),
{arg0, arg1, arg2, arg3}
);
result = smtutil::Expression::select(e, ecrecoverInput);
}
else
solAssert(false, "");
defineExpr(_funCall, *result);
}
void SMTEncoder::visitGasLeft(FunctionCall const& _funCall)
{
string gasLeft = "gasleft()";