Add benchmarking code and optimization option.

benchmark/CMakeLists.txt

@@ -0,0 +1,14 @@
+set(BENCHMARK_SRC
+  "main.cpp"
+)
+
+if(WITH_BENCHMARK)
+    add_executable(${BENCHMARK_NAME} ${BENCHMARK_SRC})
+    target_link_libraries(
+        ${BENCHMARK_NAME} ${CORE_NAME} ${DL_LIB} ${Boost_LIBRARIES} ${CRYPTO++_LIBRARIES}
+        ${CMAKE_THREAD_LIBS_INIT}
+    )
+    install(TARGETS
+        ${BENCHMARK_NAME} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    )
+endif()