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