skinny64-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 SKINNY64_CIPHER_h
#define SKINNY64_CIPHER_h

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

#ifdef __cplusplus
extern "C" {
#endif

#define SKINNY64_BLOCK_SIZE 8

#define SKINNY64_MAX_ROUNDS 40

typedef union
{
    uint16_t row[4];        
    uint32_t lrow[2];       
    uint64_t llrow;         
} Skinny64Cells_t;

typedef union
{
    uint16_t row[2];        
    uint32_t lrow;          
} Skinny64HalfCells_t;

typedef struct
{
    unsigned rounds;

    Skinny64HalfCells_t schedule[SKINNY64_MAX_ROUNDS];

} Skinny64Key_t;

typedef struct
{
    Skinny64Key_t ks;

    uint8_t tweak[SKINNY64_BLOCK_SIZE];

} Skinny64TweakedKey_t;

typedef struct
{
    const void *vtable;

    void *ctx;

} Skinny64CTR_t;

int skinny64_set_key(Skinny64Key_t *ks, const void *key, unsigned size);

int skinny64_set_tweaked_key
    (Skinny64TweakedKey_t *ks, const void *key, unsigned key_size);

int skinny64_set_tweak
    (Skinny64TweakedKey_t *ks, const void *tweak, unsigned tweak_size);

void skinny64_ecb_encrypt
    (void *output, const void *input, const Skinny64Key_t *ks);

void skinny64_ecb_decrypt
    (void *output, const void *input, const Skinny64Key_t *ks);

int skinny64_ctr_init(Skinny64CTR_t *ctr);

void skinny64_ctr_cleanup(Skinny64CTR_t *ctr);

int skinny64_ctr_set_key(Skinny64CTR_t *ctr, const void *key, unsigned size);

int skinny64_ctr_set_tweaked_key
    (Skinny64CTR_t *ctr, const void *key, unsigned key_size);

int skinny64_ctr_set_tweak
    (Skinny64CTR_t *ctr, const void *tweak, unsigned tweak_size);

int skinny64_ctr_set_counter
    (Skinny64CTR_t *ctr, const void *counter, unsigned size);

int skinny64_ctr_encrypt
    (void *output, const void *input, size_t size, Skinny64CTR_t *ctr);

#ifdef __cplusplus
}
#endif

#endif