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/* xts.h

XEX-based tweaked-codebook mode with ciphertext stealing (XTS)

This file is part of GNU Nettle.

GNU Nettle is free software: you can redistribute it and/or
   modify it under the terms of either:

* the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

* the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

or both in parallel, as here.

GNU Nettle is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see http://www.gnu.org/licenses/.
*/

#ifndef NETTLE_XTS_H_INCLUDED
#define NETTLE_XTS_H_INCLUDED

#include "nettle-types.h"
#include "aes.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Name mangling */
#define xts_encrypt_message nettle_xts_encrypt_message
#define xts_decrypt_message nettle_xts_decrypt_message
#define xts_aes128_set_encrypt_key nettle_xts_aes128_set_encrypt_key
#define xts_aes128_set_decrypt_key nettle_xts_aes128_set_decrypt_key
#define xts_aes128_encrypt_message nettle_xts_aes128_encrypt_message
#define xts_aes128_decrypt_message nettle_xts_aes128_decrypt_message
#define xts_aes256_set_encrypt_key nettle_xts_aes256_set_encrypt_key
#define xts_aes256_set_decrypt_key nettle_xts_aes256_set_decrypt_key
#define xts_aes256_encrypt_message nettle_xts_aes256_encrypt_message
#define xts_aes256_decrypt_message nettle_xts_aes256_decrypt_message

#define XTS_BLOCK_SIZE 16

void
xts_encrypt_message(const void *enc_ctx, const void *twk_ctx,
                nettle_cipher_func *encf,
                const uint8_t *tweak, size_t length,
                uint8_t *dst, const uint8_t *src);
void
xts_decrypt_message(const void *dec_ctx, const void *twk_ctx,
                    nettle_cipher_func *decf, nettle_cipher_func *encf,
                    const uint8_t *tweak, size_t length,
                    uint8_t *dst, const uint8_t *src);

/* XTS Mode with AES-128 */
struct xts_aes128_key {
    struct aes128_ctx cipher;
    struct aes128_ctx tweak_cipher;
};

void
xts_aes128_set_encrypt_key(struct xts_aes128_key *xts_key,
                           const uint8_t *key);

void
xts_aes128_set_decrypt_key(struct xts_aes128_key *xts_key,
                           const uint8_t *key);

void
xts_aes128_encrypt_message(struct xts_aes128_key *xtskey,
                           const uint8_t *tweak, size_t length,
                           uint8_t *dst, const uint8_t *src);

void
xts_aes128_decrypt_message(struct xts_aes128_key *xts_key,
                           const uint8_t *tweak, size_t length,
                           uint8_t *dst, const uint8_t *src);

/* XTS Mode with AES-256 */
struct xts_aes256_key {
    struct aes256_ctx cipher;
    struct aes256_ctx tweak_cipher;
};

void
xts_aes256_set_encrypt_key(struct xts_aes256_key *xts_key,
                           const uint8_t *key);

void
xts_aes256_set_decrypt_key(struct xts_aes256_key *xts_key,
                           const uint8_t *key);

void
xts_aes256_encrypt_message(struct xts_aes256_key *xts_key,
                           const uint8_t *tweak, size_t length,
                           uint8_t *dst, const uint8_t *src);

void
xts_aes256_decrypt_message(struct xts_aes256_key *xts_key,
                           const uint8_t *tweak, size_t length,
                           uint8_t *dst, const uint8_t *src);

#ifdef __cplusplus
}
#endif

#endif /* NETTLE_XTS_H_INCLUDED */