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authorNicolai Stange <nstange@suse.de>2022-12-30 00:17:05 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2023-01-06 12:15:46 +0300
commit1c4428b295884316eaff16be9c1d85f7c2361696 (patch)
tree93daad08b6d207cffea11813ce6c96e641d92384 /include/crypto
parent39a76cf1f5cecec2256ab2d20cf714573c5d994c (diff)
downloadlinux-1c4428b295884316eaff16be9c1d85f7c2361696.tar.xz
crypto: xts - restrict key lengths to approved values in FIPS mode
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>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/xts.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/crypto/xts.h b/include/crypto/xts.h
index 0f8dba69feb4..a233c1054df2 100644
--- a/include/crypto/xts.h
+++ b/include/crypto/xts.h
@@ -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)) &&