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crypto: xts - restrict key lengths to approved values in FIPS mode

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According to FIPS 140-3 IG C.I., only (total) key lengths of either
256 bits or 512 bits are allowed with xts(aes). Make xts_verify_key() to
reject anything else in FIPS mode.

As xts(aes) is the only approved xts() template instantiation in FIPS mode,
the new restriction implemented in xts_verify_key() effectively only
applies to this particular construction.

Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Nicolai Stange 2022-12-29 22:17:05 +01:00 committed by Herbert Xu
parent 39a76cf1f5
commit 1c4428b295
1 changed files with 7 additions and 0 deletions
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7
include/crypto/xts.h
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@ -35,6 +35,13 @@ static inline int xts_verify_key(struct crypto_skcipher *tfm,
if (keylen % 2)
return -EINVAL;
/*
* 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 (fips_enabled && keylen != 32 && keylen != 64)
return -EINVAL;
/* ensure that the AES and tweak key are not identical */
if ((fips_enabled || (crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&