skinny128-cipher.h

/*
 * Copyright (C) 2017 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 SKINNY128_CIPHER_h
#define SKINNY128_CIPHER_h

#include <stdint.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#define SKINNY128_BLOCK_SIZE 16

#define SKINNY128_MAX_ROUNDS 56

typedef union
{
    uint32_t row[4];        
    uint64_t lrow[2];       
} Skinny128Cells_t;

typedef union
{
    uint32_t row[2];        
    uint64_t lrow;          
} Skinny128HalfCells_t;

typedef struct
{
    unsigned rounds;

    Skinny128HalfCells_t schedule[SKINNY128_MAX_ROUNDS];

} Skinny128Key_t;

typedef struct
{
    Skinny128Key_t ks;

    uint8_t tweak[SKINNY128_BLOCK_SIZE];

} Skinny128TweakedKey_t;

typedef struct
{
    const void *vtable;

    void *ctx;

} Skinny128CTR_t;

int skinny128_set_key(Skinny128Key_t *ks, const void *key, unsigned size);

int skinny128_set_tweaked_key
    (Skinny128TweakedKey_t *ks, const void *key, unsigned key_size);

int skinny128_set_tweak
    (Skinny128TweakedKey_t *ks, const void *tweak, unsigned tweak_size);

void skinny128_ecb_encrypt
    (void *output, const void *input, const Skinny128Key_t *ks);

void skinny128_ecb_decrypt
    (void *output, const void *input, const Skinny128Key_t *ks);

int skinny128_ctr_init(Skinny128CTR_t *ctr);

void skinny128_ctr_cleanup(Skinny128CTR_t *ctr);

int skinny128_ctr_set_key(Skinny128CTR_t *ctr, const void *key, unsigned size);

int skinny128_ctr_set_tweaked_key
    (Skinny128CTR_t *ctr, const void *key, unsigned key_size);

int skinny128_ctr_set_tweak
    (Skinny128CTR_t *ctr, const void *tweak, unsigned tweak_size);

int skinny128_ctr_set_counter
    (Skinny128CTR_t *ctr, const void *counter, unsigned size);

int skinny128_ctr_encrypt
    (void *output, const void *input, size_t size, Skinny128CTR_t *ctr);

#ifdef __cplusplus
}
#endif

#endif