projects / linux.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 | ||
| ce004556 JK |
11 | #define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x)) |
| 12 | ||
| 28856a9e SM |
13 | static inline int xts_check_key(struct crypto_tfm *tfm, |
| 14 | const u8 *key, unsigned int keylen) | |
| 15 | { | |
| 16 | u32 *flags = &tfm->crt_flags; | |
| 17 | ||
| 18 | /* | |
| 19 | * key consists of keys of equal size concatenated, therefore | |
| 20 | * the length must be even. | |
| 21 | */ | |
| 22 | if (keylen % 2) { | |
| 23 | *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
| 24 | return -EINVAL; | |
| 25 | } | |
| 26 | ||
| 27 | /* ensure that the AES and tweak key are not identical */ | |
| 28 | if (fips_enabled && | |
| 29 | !crypto_memneq(key, key + (keylen / 2), keylen / 2)) { | |
| 30 | *flags |= CRYPTO_TFM_RES_WEAK_KEY; | |
| 31 | return -EINVAL; | |
| 32 | } | |
| 33 | ||
| 34 | return 0; | |
| 35 | } | |
| 36 | ||
| f1c131b4 HX |
37 | static inline int xts_verify_key(struct crypto_skcipher *tfm, |
| 38 | const u8 *key, unsigned int keylen) | |
| 39 | { | |
| 40 | /* | |
| 41 | * key consists of keys of equal size concatenated, therefore | |
| 42 | * the length must be even. | |
| 43 | */ | |
| 44 | if (keylen % 2) { | |
| 45 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
| 46 | return -EINVAL; | |
| 47 | } | |
| 48 | ||
| 49 | /* ensure that the AES and tweak key are not identical */ | |
| 50 | if ((fips_enabled || crypto_skcipher_get_flags(tfm) & | |
| 51 | CRYPTO_TFM_REQ_WEAK_KEY) && | |
| 52 | !crypto_memneq(key, key + (keylen / 2), keylen / 2)) { | |
| 53 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY); | |
| 54 | return -EINVAL; | |
| 55 | } | |
| 56 | ||
| 57 | return 0; | |
| 58 | } | |
| 59 | ||
| ce004556 | 60 | #endif /* _CRYPTO_XTS_H */ |