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/*
* Copyright (C) 2008, Damien Miller
* Copyright (C) 2011, Alex Hornung
*
* 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 <inttypes.h>
#define XTS_MAX_BLOCKSIZE 16
#define XTS_IVSIZE 8
#define XTS_ALPHA 0x87 /* GF(2^128) generator polynomial */
typedef int (*encrypt_decrypt_fn)(void *, size_t, const uint8_t *, uint8_t *);
typedef int (*set_key_fn)(void **, void *, void *, const uint8_t *, int);
typedef int (*zero_key_fn)(void **);
struct xts_ctx {
encrypt_decrypt_fn encrypt_fn;
encrypt_decrypt_fn decrypt_fn;
set_key_fn set_key_fn;
zero_key_fn zero_key_fn;
void *ctx1;
void *ctx2;
uint8_t tweak[XTS_MAX_BLOCKSIZE];
uint32_t blk_sz;
};
int xts_init(struct xts_ctx *ctxp, void *arg1, void *arg2, set_key_fn set_key_fn,
zero_key_fn zero_key_fn, encrypt_decrypt_fn encrypt_fn,
encrypt_decrypt_fn decrypt_fn, uint32_t blk_sz, uint8_t *key, int len);
int xts_encrypt(struct xts_ctx *ctx, uint8_t *data, size_t len, uint8_t *iv);
int xts_decrypt(struct xts_ctx *ctx, uint8_t *data, size_t len, uint8_t *iv);
int xts_uninit(struct xts_ctx *ctxp);