diff --git a/include/blowfish/blowfish.hpp b/include/blowfish/blowfish.hpp
new file mode 100644
index 0000000..e5730b3
--- /dev/null
+++ b/include/blowfish/blowfish.hpp
@@ -0,0 +1,33 @@
+/**
+ * @file blowfish.hpp
+ * @author Avinal Kumar
+ * @since February 15, 2021
+ *
+ * Blowfish Algorithm Header File
+ */
+
+#define MAXKEYBYTES 56 // 448 bits max
+
+#define DWORD unsigned long
+#define WORD unsigned int
+#define BYTE unsigned char
+
+#if !defined(BLOWFISH_HPP)
+#define BLOWFISH_HPP
+
+#include <algorithm>
+#include <array>
+
+class blowfish {
+private:
+  std::array<DWORD, 16 + 2> PArray;
+  std::array<std::array<DWORD, 256>, 4> Sboxes;
+  DWORD F(DWORD x);
+
+public:
+  blowfish(BYTE *key, WORD keylength);
+  void encrypt(DWORD *xl, DWORD *xr);
+  void decrypt(DWORD *xl, DWORD *xr);
+};
+
+#endif // BLOWFISH_HPP