internal-skinny-plus.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
 * 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_SKINNY_PLUS_H
#define LW_INTERNAL_SKINNY_PLUS_H

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

#ifdef __cplusplus
extern "C" {
#endif

#define SKINNY_PLUS_BLOCK_SIZE 16

#define SKINNY_PLUS_ROUNDS 40

typedef struct
{
    uint8_t TK1[16];

#if SKINNY_PLUS_VARIANT == SKINNY_PLUS_VARIANT_TINY

    uint8_t TK2[16];

    uint8_t TK3[16];
#elif SKINNY_PLUS_VARIANT == SKINNY_PLUS_VARIANT_FULL

    uint32_t k[SKINNY_PLUS_ROUNDS * 4];
#else

    uint32_t k[SKINNY_PLUS_ROUNDS * 2];
#endif

} skinny_plus_key_schedule_t;

void skinny_plus_init
    (skinny_plus_key_schedule_t *ks, const unsigned char key[48]);

void skinny_plus_init_without_tk1
    (skinny_plus_key_schedule_t *ks, const unsigned char *tk2,
     const unsigned char *tk3);

void skinny_plus_encrypt
    (const skinny_plus_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input);

void skinny_plus_decrypt
    (const skinny_plus_key_schedule_t *ks, unsigned char *output,
     const unsigned char *input);

void skinny_plus_encrypt_tk_full
    (const unsigned char key[48], unsigned char *output,
     const unsigned char *input);

void skinny_plus_decrypt_tk_full
    (const unsigned char key[48], unsigned char *output,
     const unsigned char *input);

#ifdef __cplusplus
}
#endif

#endif