internal-gift128.h

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/*
 * Copyright (C) 2021 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
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 */

#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_BLK_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_preloaded
    (const gift128b_key_schedule_t *ks, uint32_t output[4],
     const uint32_t input[4]);

void gift128b_decrypt_preloaded
    (const gift128b_key_schedule_t *ks, uint32_t output[4],
     const uint32_t input[4]);

void gift128_nibbles_to_words(uint32_t block[4]);

void gift128_words_to_nibbles(uint32_t block[4]);

#ifdef __cplusplus
}
#endif

#endif