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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 static 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 
 28 static 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 */
 48 

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