diff --git a/include/blowfish/blowfish.h b/include/blowfish/blowfish.h
index f03223a..1163208 100644
--- a/include/blowfish/blowfish.h
+++ b/include/blowfish/blowfish.h
@@ -13,23 +13,25 @@
 #define MAXKEYBYTES 56 // 448 bits max
 #define N 16
 
-#define BYTE unsigned char
-#define DWORD unsigned long
-#define WORD unsigned int
 
 #if !defined(BLOWFISH_BLOWFISH_H_)
 #define BLOWFISH_BLOWFISH_H_
 
 class Blowfish {
 private:
-  std::array<DWORD, N + 2> PArray;
-  std::array<std::array<DWORD, 256>, 4> Sboxes;
-  DWORD F(DWORD x);
+  std::array<uint32_t, N + 2> PArray;
+  std::array<std::array<uint32_t, 256>, 4> Sboxes;
+  uint32_t F(uint32_t x);
 
 public:
+  Blowfish() {}
   Blowfish(std::string const &key);
-  void encrypt(DWORD &xl, DWORD &xr);
-  void decrypt(DWORD &xl, DWORD &xr);
+  Blowfish(Blowfish const &) = delete;
+
+  void initialize(std::string const &key);
+
+  void encrypt(uint32_t &xl, uint32_t &xr);
+  void decrypt(uint32_t &xl, uint32_t &xr);
 };
 
 #endif // BLOWFISH_BLOWFISH_H_