root/include/crypto/xts.h

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#ifndef _CRYPTO_XTS_H
#define _CRYPTO_XTS_H

#include <crypto/b128ops.h>

struct scatterlist;
struct blkcipher_desc;

#define XTS_BLOCK_SIZE 16

struct xts_crypt_req {
        be128 *tbuf;
        unsigned int tbuflen;

        void *tweak_ctx;
        void (*tweak_fn)(void *ctx, u8* dst, const u8* src);
        void *crypt_ctx;
        void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
};

#define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x))

int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
              struct scatterlist *src, unsigned int nbytes,
              struct xts_crypt_req *req);

#endif  /* _CRYPTO_XTS_H */
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