diff --git a/Source/Utility/Md5State.h b/Source/Utility/Md5State.h
new file mode 100644
index 0000000..eef2491
--- /dev/null
+++ b/Source/Utility/Md5State.h
@@ -0,0 +1,26 @@
+#ifndef RAGNAROK_SOURCE_UTILITY_MD5STATE_H
+#define RAGNAROK_SOURCE_UTILITY_MD5STATE_H
+
+#include <cstddef>
+#include <cstdint>
+
+class MD5State {
+public:
+  void Init();
+  void Append(const unsigned char* data, int nbytes);
+  void Finish(unsigned char* digest);
+
+  void Process(const unsigned char* data);
+
+  /* 0000 */ std::uint32_t count[2];
+  /* 0008 */ std::uint32_t abcd[4];
+  /* 0018 */ unsigned char buf[64];
+};
+
+#if defined(_WIN32) && !defined(_WIN64)
+static_assert(offsetof(MD5State, abcd) == 0x08);
+static_assert(offsetof(MD5State, buf) == 0x18);
+static_assert(sizeof(MD5State) == 0x58);
+#endif
+
+#endif
diff --git a/data/compile.json b/data/compile.json
index 3721fed..ee6f112 100644
--- a/data/compile.json
+++ b/data/compile.json
@@ -716,6 +716,7 @@
   "Source/Utility/Math/ClientAngles.cpp": 0,
   "Source/Utility/Math/RadialGrid.cpp": 0,
   "Source/Utility/Math/RayTriangle.cpp": 0,
+  "Source/Utility/Md5.cpp": 0,
   "Source/Utility/NFileLog.cpp": 0,
   "Source/Utility/NIPAddr.cpp": 0,
   "Source/Utility/ProcessSecurity.cpp": 0,