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/*********************************************************************
* Filename: des.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 DES implementation.
Note that encryption and decryption are defined by how
the key setup is performed, the actual en/de-cryption is
performed by the same function.
*********************************************************************/
#ifndef DES_H
#define DESH
/*************************** HEADER FILES ***************************/
#include <stddef.h>
/****************************** MACROS ******************************/
#define DES_BLOCK_SIZE 8 // DES 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 enum {
DES_ENCRYPT,
DES_DECRYPT
} DES_MODE;
/*********************** FUNCTION DECLARATIONS **********************/
void des_key_setup(const BYTE key[], BYTE schedule[][6], DES_MODE mode);
void des_crypt(const BYTE in[], BYTE out[], const BYTE key[][6]);
void three_des_key_setup(const BYTE key[], BYTE schedule[][16][6], DES_MODE mode);
void three_des_crypt(const BYTE in[], BYTE out[], const BYTE key[][16][6]);
#endif // DES_H
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