diff options
Diffstat (limited to 'include/crypto/xts.h')
| -rw-r--r-- | include/crypto/xts.h | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/include/crypto/xts.h b/include/crypto/xts.h index 0f8dba69feb4..15b16c4853d8 100644 --- a/include/crypto/xts.h +++ b/include/crypto/xts.h @@ -8,8 +8,8 @@ #define XTS_BLOCK_SIZE 16 -static inline int xts_check_key(struct crypto_tfm *tfm, - const u8 *key, unsigned int keylen) +static inline int xts_verify_key(struct crypto_skcipher *tfm, + const u8 *key, unsigned int keylen) { /* * key consists of keys of equal size concatenated, therefore @@ -18,24 +18,17 @@ static inline int xts_check_key(struct crypto_tfm *tfm, if (keylen % 2) return -EINVAL; - /* ensure that the AES and tweak key are not identical */ - if (fips_enabled && !crypto_memneq(key, key + (keylen / 2), keylen / 2)) - return -EINVAL; - - return 0; -} - -static inline int xts_verify_key(struct crypto_skcipher *tfm, - const u8 *key, unsigned int keylen) -{ /* - * key consists of keys of equal size concatenated, therefore - * the length must be even. + * In FIPS mode only a combined key length of either 256 or + * 512 bits is allowed, c.f. FIPS 140-3 IG C.I. */ - if (keylen % 2) + if (fips_enabled && keylen != 32 && keylen != 64) return -EINVAL; - /* ensure that the AES and tweak key are not identical */ + /* + * Ensure that the AES and tweak key are not identical when + * in FIPS mode or the FORBID_WEAK_KEYS flag is set. + */ if ((fips_enabled || (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) && !crypto_memneq(key, key + (keylen / 2), keylen / 2)) |