mantis-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 MANTIS_CIPHER_h
#define MANTIS_CIPHER_h

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

#ifdef __cplusplus
extern "C" {
#endif

#define MANTIS_BLOCK_SIZE 8

#define MANTIS_KEY_SIZE 16

#define MANTIS_TWEAK_SIZE 8

#define MANTIS_MIN_ROUNDS 5

#define MANTIS_MAX_ROUNDS 8

#define MANTIS_ENCRYPT 1

#define MANTIS_DECRYPT 0

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

typedef struct
{
    MantisCells_t k0;

    MantisCells_t k0prime;

    MantisCells_t k1;

    MantisCells_t tweak;

    unsigned rounds;

} MantisKey_t;

typedef struct
{
    const void *vtable;

    void *ctx;

} MantisCTR_t;

int mantis_set_key
    (MantisKey_t *ks, const void *key, unsigned size,
     unsigned rounds, int mode);

int mantis_set_tweak(MantisKey_t *ks, const void *tweak, unsigned size);

void mantis_swap_modes(MantisKey_t *ks);

void mantis_ecb_crypt(void *output, const void *input, const MantisKey_t *ks);

void mantis_ecb_crypt_tweaked
    (void *output, const void *input, const void *tweak, const MantisKey_t *ks);

int mantis_ctr_init(MantisCTR_t *ctr);

void mantis_ctr_cleanup(MantisCTR_t *ctr);

int mantis_ctr_set_key
    (MantisCTR_t *ctr, const void *key, unsigned size, unsigned rounds);

int mantis_ctr_set_tweak
    (MantisCTR_t *ctr, const void *tweak, unsigned tweak_size);

int mantis_ctr_set_counter
    (MantisCTR_t *ctr, const void *counter, unsigned size);

int mantis_ctr_encrypt
    (void *output, const void *input, size_t size, MantisCTR_t *ctr);

#ifdef __cplusplus
}
#endif

#endif