| 1 | /********************************************************************* |
| 2 | * Filename: des.h |
| 3 | * Author: Brad Conte (brad AT bradconte.com) |
| 4 | * Copyright: |
| 5 | * Disclaimer: This code is presented "as is" without any guarantees. |
| 6 | * Details: Defines the API for the corresponding DES implementation. |
| 7 | Note that encryption and decryption are defined by how |
| 8 | the key setup is performed, the actual en/de-cryption is |
| 9 | performed by the same function. |
| 10 | *********************************************************************/ |
| 11 | |
| 12 | #ifndef DES_H |
| 13 | #define DESH |
| 14 | |
| 15 | /*************************** HEADER FILES ***************************/ |
| 16 | #include <stddef.h> |
| 17 | |
| 18 | /****************************** MACROS ******************************/ |
| 19 | #define DES_BLOCK_SIZE 8 // DES operates on 8 bytes at a time |
| 20 | |
| 21 | /**************************** DATA TYPES ****************************/ |
| 22 | typedef unsigned char BYTE; // 8-bit byte |
| 23 | typedef unsigned int WORD; // 32-bit word, change to "long" for 16-bit machines |
| 24 | |
| 25 | typedef enum { |
| 26 | DES_ENCRYPT, |
| 27 | DES_DECRYPT |
| 28 | } DES_MODE; |
| 29 | |
| 30 | /*********************** FUNCTION DECLARATIONS **********************/ |
| 31 | void des_key_setup(const BYTE key[], BYTE schedule[][6], DES_MODE mode); |
| 32 | void des_crypt(const BYTE in[], BYTE out[], const BYTE key[][6]); |
| 33 | |
| 34 | void three_des_key_setup(const BYTE key[], BYTE schedule[][16][6], DES_MODE mode); |
| 35 | void three_des_crypt(const BYTE in[], BYTE out[], const BYTE key[][16][6]); |
| 36 | |
| 37 | #endif // DES_H |