1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _CRYPTO_XTS_H
 3#define _CRYPTO_XTS_H
 4
 5#include <crypto/b128ops.h>
 6#include <crypto/internal/skcipher.h>
 7#include <linux/fips.h>
 8
 
 
 
 9#define XTS_BLOCK_SIZE 16
10
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
11static inline int xts_check_key(struct crypto_tfm *tfm,
12				const u8 *key, unsigned int keylen)
13{
 
 
14	/*
15	 * key consists of keys of equal size concatenated, therefore
16	 * the length must be even.
17	 */
18	if (keylen % 2)
 
19		return -EINVAL;
 
20
21	/* ensure that the AES and tweak key are not identical */
22	if (fips_enabled && !crypto_memneq(key, key + (keylen / 2), keylen / 2))
 
 
23		return -EINVAL;
 
24
25	return 0;
26}
27
28static inline int xts_verify_key(struct crypto_skcipher *tfm,
29				 const u8 *key, unsigned int keylen)
30{
31	/*
32	 * key consists of keys of equal size concatenated, therefore
33	 * the length must be even.
34	 */
35	if (keylen % 2)
 
36		return -EINVAL;
 
37
38	/* ensure that the AES and tweak key are not identical */
39	if ((fips_enabled || (crypto_skcipher_get_flags(tfm) &
40			      CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&
41	    !crypto_memneq(key, key + (keylen / 2), keylen / 2))
 
42		return -EINVAL;
 
43
44	return 0;
45}
46
47#endif  /* _CRYPTO_XTS_H */

 
 1#ifndef _CRYPTO_XTS_H
 2#define _CRYPTO_XTS_H
 3
 4#include <crypto/b128ops.h>
 5#include <crypto/internal/skcipher.h>
 6#include <linux/fips.h>
 7
 8struct scatterlist;
 9struct blkcipher_desc;
10
11#define XTS_BLOCK_SIZE 16
12
13struct xts_crypt_req {
14	be128 *tbuf;
15	unsigned int tbuflen;
16
17	void *tweak_ctx;
18	void (*tweak_fn)(void *ctx, u8* dst, const u8* src);
19	void *crypt_ctx;
20	void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
21};
22
23#define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x))
24
25int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
26	      struct scatterlist *src, unsigned int nbytes,
27	      struct xts_crypt_req *req);
28
29static inline int xts_check_key(struct crypto_tfm *tfm,
30				const u8 *key, unsigned int keylen)
31{
32	u32 *flags = &tfm->crt_flags;
33
34	/*
35	 * key consists of keys of equal size concatenated, therefore
36	 * the length must be even.
37	 */
38	if (keylen % 2) {
39		*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
40		return -EINVAL;
41	}
42
43	/* ensure that the AES and tweak key are not identical */
44	if (fips_enabled &&
45	    !crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
46		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
47		return -EINVAL;
48	}
49
50	return 0;
51}
52
53static inline int xts_verify_key(struct crypto_skcipher *tfm,
54				 const u8 *key, unsigned int keylen)
55{
56	/*
57	 * key consists of keys of equal size concatenated, therefore
58	 * the length must be even.
59	 */
60	if (keylen % 2) {
61		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
62		return -EINVAL;
63	}
64
65	/* ensure that the AES and tweak key are not identical */
66	if ((fips_enabled || crypto_skcipher_get_flags(tfm) &
67			     CRYPTO_TFM_REQ_WEAK_KEY) &&
68	    !crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
69		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
70		return -EINVAL;
71	}
72
73	return 0;
74}
75
76#endif  /* _CRYPTO_XTS_H */