internal-gift128.h

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/*
 * Copyright (C) 2020 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef LW_INTERNAL_GIFT128_H
#define LW_INTERNAL_GIFT128_H

#include <stddef.h>
#include <stdint.h>
#include "internal-gift128-config.h"

#ifdef __cplusplus
extern "C" {
#endif

#define GIFT128_BLOCK_SIZE 16

#if GIFT128_VARIANT == GIFT128_VARIANT_TINY
#define GIFT128_ROUND_KEYS 4
#elif GIFT128_VARIANT == GIFT128_VARIANT_SMALL
#define GIFT128_ROUND_KEYS 20
#else
#define GIFT128_ROUND_KEYS 80
#endif

typedef struct
{
    uint32_t k[GIFT128_ROUND_KEYS];

} gift128b_key_schedule_t;

void gift128b_init(gift128b_key_schedule_t *ks, const unsigned char *key);

void gift128b_encrypt
    (const gift128b_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input);

void gift128b_encrypt_preloaded
    (const gift128b_key_schedule_t *ks, uint32_t output[4],
     const uint32_t input[4]);

void gift128b_decrypt
    (const gift128b_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input);

typedef gift128b_key_schedule_t gift128n_key_schedule_t;

void gift128n_init(gift128n_key_schedule_t *ks, const unsigned char *key);

void gift128n_encrypt
    (const gift128n_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input);

void gift128n_decrypt
    (const gift128n_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input);

/* 4-bit tweak values expanded to 32-bit for TweGIFT-128 */
#define GIFT128T_TWEAK_0    0x00000000      
#define GIFT128T_TWEAK_1    0xe1e1e1e1      
#define GIFT128T_TWEAK_2    0xd2d2d2d2      
#define GIFT128T_TWEAK_3    0x33333333      
#define GIFT128T_TWEAK_4    0xb4b4b4b4      
#define GIFT128T_TWEAK_5    0x55555555      
#define GIFT128T_TWEAK_6    0x66666666      
#define GIFT128T_TWEAK_7    0x87878787      
#define GIFT128T_TWEAK_8    0x78787878      
#define GIFT128T_TWEAK_9    0x99999999      
#define GIFT128T_TWEAK_10   0xaaaaaaaa      
#define GIFT128T_TWEAK_11   0x4b4b4b4b      
#define GIFT128T_TWEAK_12   0xcccccccc      
#define GIFT128T_TWEAK_13   0x2d2d2d2d      
#define GIFT128T_TWEAK_14   0x1e1e1e1e      
#define GIFT128T_TWEAK_15   0xffffffff      
void gift128t_encrypt
    (const gift128n_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input, uint32_t tweak);

void gift128t_decrypt
    (const gift128n_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input, uint32_t tweak);

#ifdef __cplusplus
}
#endif

#endif