/* des3.h
 *
 * Copyright (C) 2006-2017 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */


#ifndef WOLF_CRYPT_DES3_H
# define WOLF_CRYPT_DES3_H

# include "types.h"

# ifndef NO_DES3

#  ifdef HAVE_FIPS
/* included for fips @wc_fips */
#   include <cyassl/ctaocrypt/des3.h>
#  endif

#  ifdef __cplusplus
extern "C" {
#  endif

#  ifndef HAVE_FIPS /* to avoid redefinition of macros */

#   ifdef WOLFSSL_ASYNC_CRYPT
#    include "async.h"
#   endif

#   if defined(FREESCALE_LTC)
/**================= Use KSDK 1.3 LTC DPA Driver - Dec 29, 2016 =================**/
#    include "fsl_ltc_dpa.h"
/**==========================================================================**/
#   endif

enum {
    DES_ENC_TYPE   = 2, /* cipher unique type */
    DES3_ENC_TYPE  = 3, /* cipher unique type */
    DES_BLOCK_SIZE = 8,
    DES_KS_SIZE    = 32,

    DES_ENCRYPTION = 0,
    DES_DECRYPTION = 1,

    DES_WO_DPA     = 0x7f
};

#   define DES_IVLEN   8
#   define DES_KEYLEN  8
#   define DES3_IVLEN  8
#   define DES3_KEYLEN 24


#   if defined(STM32_CRYPTO)
enum {
    DES_CBC = 0,
    DES_ECB = 1
};
#   endif


/* DES encryption and decryption */
typedef struct Des {
    word32           reg[DES_BLOCK_SIZE / sizeof(word32)]; /* for CBC mode */
    word32           tmp[DES_BLOCK_SIZE / sizeof(word32)]; /* same         */
    word32           key[DES_KS_SIZE];
    #   if defined(FREESCALE_LTC)
    /**================= Use KSDK 1.3 LTC DPA Driver - Dec 29, 2016 =================**/
    word32           dpa;
    ltc_dpa_handle_t dpa_data;
    /**==========================================================================**/
    #   endif
} Des;


/* DES3 encryption and decryption */
typedef struct Des3 {
    word32           key[3][DES_KS_SIZE];
    word32           reg[DES_BLOCK_SIZE / sizeof(word32)]; /* for CBC mode */
    word32           tmp[DES_BLOCK_SIZE / sizeof(word32)]; /* same         */
    #   ifdef WOLFSSL_ASYNC_CRYPT
    const byte *     key_raw;
    const byte *     iv_raw;
    WC_ASYNC_DEV     asyncDev;
    #   endif
    void *           heap;
    #   if defined(FREESCALE_LTC)
    /**================= Use KSDK 1.3 LTC DPA Driver - Dec 29, 2016 =================**/
    word32           dpa;
    ltc_dpa_handle_t dpa_data;
    /**==========================================================================**/
    #   endif
} Des3;
#  endif /* HAVE_FIPS */


WOLFSSL_API int
wc_Des_SetKey(Des * des, const byte * key,
  const byte * iv, int dir);
WOLFSSL_API void
wc_Des_SetIV(Des * des, const byte * iv);
WOLFSSL_API int
wc_Des_CbcEncrypt(Des * des, byte * out,
  const byte * in, word32 sz);
WOLFSSL_API int
wc_Des_CbcDecrypt(Des * des, byte * out,
  const byte * in, word32 sz);
WOLFSSL_API int
wc_Des_EcbEncrypt(Des * des, byte * out,
  const byte * in, word32 sz);
WOLFSSL_API int
wc_Des_EcbDecrypt(Des * des, byte * out,
  const byte * in, word32 sz);
WOLFSSL_API int
wc_Des3_EcbEncrypt(Des3 * des, byte * out,
  const byte * in, word32 sz);
WOLFSSL_API int
wc_Des3_EcbDecrypt(Des3 * des, byte * out,
  const byte * in, word32 sz);

WOLFSSL_API int
wc_Des3_Set2Key(Des3 * des, const byte * key,
  const byte * iv, int dir);

/* ECB decrypt same process as encrypt but with decrypt key */
// #define wc_Des_EcbDecrypt  wc_Des_EcbEncrypt
// #define wc_Des3_EcbDecrypt wc_Des3_EcbEncrypt

WOLFSSL_API int
wc_Des3_SetKey(Des3 * des, const byte * key,
  const byte * iv, int dir);
WOLFSSL_API int
wc_Des3_SetIV(Des3 * des, const byte * iv);
WOLFSSL_API int
wc_Des3_CbcEncrypt(Des3 * des, byte * out,
  const byte * in, word32 sz);
WOLFSSL_API int
wc_Des3_CbcDecrypt(Des3 * des, byte * out,
  const byte * in, word32 sz);

/* These are only required when using either:
 * static memory (WOLFSSL_STATIC_MEMORY) or asynchronous (WOLFSSL_ASYNC_CRYPT) */
WOLFSSL_API int
wc_Des3Init(Des3 *, void *, int);
WOLFSSL_API void
wc_Des3Free(Des3 *);

#  ifdef __cplusplus
} /* extern "C" */
#  endif

# endif /* NO_DES3 */
#endif  /* WOLF_CRYPT_DES3_H */
