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TOMOYO Linux Cross Reference
Linux/include/crypto/xts.h

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  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 
 11 #define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x))
 12 
 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 
 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 
 60 #endif  /* _CRYPTO_XTS_H */
 61 

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