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+/*********************************************************************
+* Filename: blowfish.h
+* Author: Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details: Defines the API for the corresponding Blowfish implementation.
+*********************************************************************/
+
+#ifndef BLOWFISH_H
+#define BLOWFISH_H
+
+/*************************** HEADER FILES ***************************/
+#include <stddef.h>
+
+/****************************** MACROS ******************************/
+#define BLOWFISH_BLOCK_SIZE 8 // Blowfish operates on 8 bytes at a time
+
+/**************************** DATA TYPES ****************************/
+typedef unsigned char BYTE; // 8-bit byte
+typedef unsigned int WORD; // 32-bit word, change to "long" for 16-bit machines
+
+typedef struct {
+ WORD p[18];
+ WORD s[4][256];
+} BLOWFISH_KEY;
+
+/*********************** FUNCTION DECLARATIONS **********************/
+void blowfish_key_setup(const BYTE user_key[], BLOWFISH_KEY *keystruct, size_t len);
+void blowfish_encrypt(const BYTE in[], BYTE out[], const BLOWFISH_KEY *keystruct);
+void blowfish_decrypt(const BYTE in[], BYTE out[], const BLOWFISH_KEY *keystruct);
+
+#endif // BLOWFISH_H