1/*	$OpenBSD: aes_xts.h,v 1.1 2012/10/09 12:36:50 jsing Exp $	*/
2/*
3 * Copyright (C) 2008, Damien Miller
4 *
5 * Permission to use, copy, and modify this software with or without fee
6 * is hereby granted, provided that this entire notice is included in
7 * all copies of any software which is or includes a copy or
8 * modification of this software.
9 * You may use this code under the GNU public license if you so wish. Please
10 * contribute changes back to the authors under this freer than GPL license
11 * so that we may further the use of strong encryption without limitations to
12 * all.
13 *
14 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
15 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
16 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
17 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
18 * PURPOSE.
19 */
20
21#include "rijndael.h"
22
23#define AES_XTS_BLOCKSIZE	16
24#define AES_XTS_IVSIZE		8
25#define AES_XTS_ALPHA		0x87	/* GF(2^128) generator polynomial */
26
27struct aes_xts_ctx {
28	rijndael_ctx key1;
29	rijndael_ctx key2;
30	u_int8_t tweak[AES_XTS_BLOCKSIZE];
31};
32
33int  aes_xts_setkey(struct aes_xts_ctx *, u_int8_t *, int);
34void aes_xts_crypt(struct aes_xts_ctx *, u_int8_t *, u_int);
35void aes_xts_encrypt(struct aes_xts_ctx *, u_int8_t *);
36void aes_xts_decrypt(struct aes_xts_ctx *, u_int8_t *);
37void aes_xts_zerokey(struct aes_xts_ctx *);
38void aes_xts_reinit(struct aes_xts_ctx *, u_int8_t *);
39