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 27 struct aes_xts_ctx { 28 rijndael_ctx key1; 29 rijndael_ctx key2; 30 u_int8_t tweak[AES_XTS_BLOCKSIZE]; 31 }; 32 33 int aes_xts_setkey(struct aes_xts_ctx *, u_int8_t *, int); 34 void aes_xts_crypt(struct aes_xts_ctx *, u_int8_t *, u_int); 35 void aes_xts_encrypt(struct aes_xts_ctx *, u_int8_t *); 36 void aes_xts_decrypt(struct aes_xts_ctx *, u_int8_t *); 37 void aes_xts_zerokey(struct aes_xts_ctx *); 38 void aes_xts_reinit(struct aes_xts_ctx *, u_int8_t *); 39