/*
 * rijndael-api-fst.h   v2.3   April '2000
 *
 * Optimised ANSI C code
 *
 * #define INTERMEDIATE_VALUE_KAT to generate the Intermediate Value Known Answer Test.
 */

#ifndef __RIJNDAEL_API_FST_H
#define __RIJNDAEL_API_FST_H

#include <stdio.h>
#include "rijndael-alg-fst.h"

/*  Defines:
        Add any additional defines you need
*/

#define     DIR_ENCRYPT           0 /*  Are we encrpyting?  */
#define     DIR_DECRYPT           1 /*  Are we decrpyting?  */
#define     MODE_ECB              1 /*  Are we ciphering in ECB mode?   */
#define     MODE_CBC              2 /*  Are we ciphering in CBC mode?   */
#define     MODE_CFB1             3 /*  Are we ciphering in 1-bit CFB mode? */
#ifndef TRUE
#define     TRUE                  1
#endif
#ifndef FALSE
#define     FALSE                 0
#endif
#define     BITSPERBLOCK        128 /* Default number of bits in a cipher block */

/*  Error Codes - CHANGE POSSIBLE: inclusion of additional error codes  */
#define     BAD_KEY_DIR          -1 /*  Key direction is invalid, e.g., unknown value */
#define     BAD_KEY_MAT          -2 /*  Key material not of correct length */
#define     BAD_KEY_INSTANCE     -3 /*  Key passed is not valid */
#define     BAD_CIPHER_MODE      -4 /*  Params struct passed to rijndael_cipherInit invalid */
#define     BAD_CIPHER_STATE     -5 /*  Cipher in wrong state (e.g., not initialized) */
#define     BAD_BLOCK_LENGTH     -6
#define     BAD_CIPHER_INSTANCE  -7
#define     BAD_DATA             -8 /*  Data contents are invalid, e.g., invalid padding */
#define     BAD_OTHER            -9 /*  Unknown error */

/*  CHANGE POSSIBLE:  inclusion of algorithm specific defines  */
#define     MAX_KEY_SIZE         64 /* # of ASCII char's needed to represent a key */
#define     MAX_IV_SIZE          16 /* # bytes needed to represent an IV  */

/*  Typedefs:

        Typedef'ed data storage elements.  Add any algorithm specific
parameters at the bottom of the structs as appropriate.
*/

#ifndef __BYTE_TYPEDEF
#define __BYTE_TYPEDEF
typedef unsigned char BYTE;
#endif

/*  The structure for key information */
typedef struct {
    BYTE  direction;                /* Key used for encrypting or decrypting? */
    int   keyLen;                   /* Length of the key  */
    char  keyMaterial[MAX_KEY_SIZE+1];  /* Raw key data in ASCII, e.g., user input or KAT values */
        /*  The following parameters are algorithm dependent, replace or add as necessary  */
        int   ROUNDS;                   /* key-length-dependent number of rounds */
    int   blockLen;                 /* block length */
    word8 keySched[MAXROUNDS+1][4][4];  /* key schedule         */
} rijndael_keyInstance;

/*  The structure for cipher information */
typedef struct {                    /* changed order of the components */
    BYTE  mode;                     /* MODE_ECB, MODE_CBC, or MODE_CFB1 */
    BYTE  IV[MAX_IV_SIZE];          /* A possible Initialization Vector for ciphering */
        /*  Add any algorithm specific parameters needed here  */
    int   blockLen;                 /* Sample: Handles non-128 bit block sizes (if available) */
} rijndael_cipherInstance;

/*  Function prototypes  */
/*  CHANGED: nothing
        TODO: implement the following extensions to setup 192-bit and 256-bit block lengths:
        rijndael_makeKeyEx():    parameter blockLen added
                        -- this parameter is absolutely necessary if you want to
                        setup the round keys in a variable block length setting
            rijndael_cipherInitEx(): parameter blockLen added (for obvious reasons)
 */

int rijndael_makeKey(rijndael_keyInstance *key, BYTE direction, int keyLen, const char *keyMaterial);

int rijndael_cipherInit(rijndael_cipherInstance *cipher, BYTE mode, char *IV);

int rijndael_blockEncrypt(rijndael_cipherInstance *cipher, rijndael_keyInstance *key,
        const BYTE *input, int inputLen, BYTE *outBuffer);

int rijndael_padEncrypt(rijndael_cipherInstance *cipher, rijndael_keyInstance *key,
                BYTE *input, int inputOctets, BYTE *outBuffer);

int rijndael_blockDecrypt(rijndael_cipherInstance *cipher, rijndael_keyInstance *key,
        BYTE *input, int inputLen, BYTE *outBuffer);

int rijndael_padDecrypt(rijndael_cipherInstance *cipher, rijndael_keyInstance *key,
                BYTE *input, int inputOctets, BYTE *outBuffer);

#ifdef INTERMEDIATE_VALUE_KAT
int cipherUpdateRounds(rijndael_cipherInstance *cipher, rijndael_keyInstance *key,
        BYTE *input, int inputLen, BYTE *outBuffer, int Rounds);
#endif /* INTERMEDIATE_VALUE_KAT */

#endif /*  __RIJNDAEL_API_FST_H */
