1 files changed, 44 insertions, 0 deletions
diff --git a/src/fix/checksum.cpp b/src/fix/checksum.cpp
new file mode 100644
index 0000000..e8e155f
--- /dev/null
+++ b/src/fix/checksum.cpp
@@ -0,0 +1,44 @@
+/*
+ * File: fix/checksum.cpp
+ * Purpose: Financial Information Exchange parser in C++
+ * Author: Amlal El Mahrouss (amlal@nekernel.org)
+ * Copyright 2026, Amlal El Mahrouss, licensed under the Boost Software License.
+ */
+
+#include <ocl/fix/checksum.hpp>
+
+namespace ocl::fix
+{
+
+	std::string try_index_checksum(range_buffer& fix)
+	{
+		if (fix.is_valid())
+			return fix["10"];
+		else
+			detail::throw_runtime_error();
+
+    detail::unreachable();
+
+		return {};
+	}
+
+	namespace operators
+	{
+
+		checksum_type
+		checksum(const boost::string_view& in_) noexcept
+		{
+			checksum_type cks{};
+
+			for (std::size_t idx{};
+				 idx < in_.size(); ++idx)
+				cks += static_cast<uint8_t>(in_[idx]);
+
+			// add \0
+			cks += 1;
+			return cks % 256;
+		}
+
+	} // namespace operators
+
+} // namespace ocl::fix