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1#ifndef _CRYPTO_XTS_H
2#define _CRYPTO_XTS_H
3
4#include <crypto/b128ops.h>
5#include <linux/crypto.h>
6#include <crypto/algapi.h>
7#include <linux/fips.h>
8
9struct scatterlist;
10struct blkcipher_desc;
11
12#define XTS_BLOCK_SIZE 16
13
14struct xts_crypt_req {
15 be128 *tbuf;
16 unsigned int tbuflen;
17
18 void *tweak_ctx;
19 void (*tweak_fn)(void *ctx, u8* dst, const u8* src);
20 void *crypt_ctx;
21 void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
22};
23
24#define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x))
25
26int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
27 struct scatterlist *src, unsigned int nbytes,
28 struct xts_crypt_req *req);
29
30static inline int xts_check_key(struct crypto_tfm *tfm,
31 const u8 *key, unsigned int keylen)
32{
33 u32 *flags = &tfm->crt_flags;
34
35 /*
36 * key consists of keys of equal size concatenated, therefore
37 * the length must be even.
38 */
39 if (keylen % 2) {
40 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
41 return -EINVAL;
42 }
43
44 /* ensure that the AES and tweak key are not identical */
45 if (fips_enabled &&
46 !crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
47 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
48 return -EINVAL;
49 }
50
51 return 0;
52}
53
54#endif /* _CRYPTO_XTS_H */