projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| ce004556 JK |
2 | #ifndef _CRYPTO_XTS_H |
| 3 | #define _CRYPTO_XTS_H | |
| 4 | ||
| 5 | #include <crypto/b128ops.h> | |
| f1c131b4 | 6 | #include <crypto/internal/skcipher.h> |
| 28856a9e | 7 | #include <linux/fips.h> |
| ce004556 | 8 | |
| ce004556 JK |
9 | #define XTS_BLOCK_SIZE 16 |
| 10 | ||
| f1c131b4 HX |
11 | static inline int xts_verify_key(struct crypto_skcipher *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 | */ | |
| 674f368a | 18 | if (keylen % 2) |
| f1c131b4 | 19 | return -EINVAL; |
| f1c131b4 | 20 | |
| 1c4428b2 NS |
21 | /* |
| 22 | * In FIPS mode only a combined key length of either 256 or | |
| 23 | * 512 bits is allowed, c.f. FIPS 140-3 IG C.I. | |
| 24 | */ | |
| 25 | if (fips_enabled && keylen != 32 && keylen != 64) | |
| 26 | return -EINVAL; | |
| 27 | ||
| 0ee43367 VD |
28 | /* |
| 29 | * Ensure that the AES and tweak key are not identical when | |
| 30 | * in FIPS mode or the FORBID_WEAK_KEYS flag is set. | |
| 31 | */ | |
| 231baecd EB |
32 | if ((fips_enabled || (crypto_skcipher_get_flags(tfm) & |
| 33 | CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) && | |
| c4c4db0d | 34 | !crypto_memneq(key, key + (keylen / 2), keylen / 2)) |
| f1c131b4 | 35 | return -EINVAL; |
| f1c131b4 HX |
36 | |
| 37 | return 0; | |
| 38 | } | |
| 39 | ||
| ce004556 | 40 | #endif /* _CRYPTO_XTS_H */ |