RLP

test/state/CMakeLists.txt

@@ -4,7 +4,9 @@
 
 add_library(evmone-state INTERFACE)
 add_library(evmone::state ALIAS evmone-state)
+target_link_libraries(evmone-state INTERFACE ethash::keccak)
 target_sources(
     evmone-state PRIVATE
     rlp.hpp
+    utils.hpp
 )

test/state/utils.hpp

@@ -0,0 +1,27 @@
+// evmone: Fast Ethereum Virtual Machine implementation
+// Copyright 2022 The evmone Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <ethash/keccak.hpp>
+#include <evmc/evmc.hpp>
+#include <evmc/hex.hpp>
+#include <cstring>
+
+namespace evmone
+{
+using evmc::bytes;
+using evmc::bytes_view;
+
+/// Better than ethash::hash256 because has some additional handy constructors.
+using hash256 = evmc::bytes32;
+
+inline hash256 keccak256(bytes_view data) noexcept
+{
+    const auto eh = ethash::keccak256(data.data(), data.size());
+    hash256 h;
+    std::memcpy(h.bytes, eh.bytes, sizeof(h));  // TODO: Use std::bit_cast.
+    return h;
+}
+}  // namespace evmone