[PATCH AUTOSEL 6.18] crypto: testmgr - allow authenc(hmac(sha{256,384}),cts(cbc(aes))) in FIPS mode

[Sasha Levin]

From: Ilya Dryomov <idryomov@xxxxxxxxx>

[ Upstream commit 6b7e97752854b1f7bccc41864428ea3b55c53cde ]

hmac(sha256), hmac(sha384) and cts(cbc(aes)) algorithms have been
marked as FIPS allowed for years.  Mark the respective authenc()
constructions per RFC 8009 ("AES Encryption with HMAC-SHA2 for
Kerberos 5") as such as well.

SP 800-57 Part 3 Rev. 1 from Jan 2015 [1] links the draft of what
became RFC 8009 in Oct 2016 as approved in section 6.3 Procurement
Guidance (item/recommendation 3).

[1] https://csrc.nist.gov/pubs/sp/800/57/pt3/r1/final

Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Reviewed-by: Viacheslav Dubeyko <Slava.Dubeyko@xxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---

LLM Generated explanations, may be completely bogus:

The background git searches finished and match what we already had:

- **Subject search** — No commit with “allow authenc” in this tree.
  Related hits are krb5/CTS/RFC 8009 work (`d1775a177f7f3`, SUNRPC RFC
  8009 KUnit tests, etc.).
- **Krb5 test vectors** — Added in `1b80b6f446ed2` (“crypto/krb5: Test
  manager data”), committed **2025-03-02**. That’s when the two
  `authenc(...,cts(cbc(aes)))` entries landed without `fips_allowed`.
- **Commit hash search** — Ilya Dryomov’s testmgr patch isn’t in 6.18.44
  yet; only his unrelated Ceph/RBD commits show up.

That supports the earlier **YES** verdict: the gap is in this tree, the
fix is a small metadata correction, and it unblocks RFC 8009 Kerberos
crypto in FIPS mode.

 crypto/testmgr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 6a490aaa71b9a..9a4d75782a486 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -4264,6 +4264,7 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.alg = "authenc(hmac(sha256),cts(cbc(aes)))",
 		.generic_driver = "authenc(hmac-sha256-lib,cts(cbc(aes-generic)))",
 		.test = alg_test_aead,
+		.fips_allowed = 1,
 		.suite = {
 			.aead = __VECS(krb5_test_aes128_cts_hmac_sha256_128)
 		}
@@ -4293,6 +4294,7 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.alg = "authenc(hmac(sha384),cts(cbc(aes)))",
 		.generic_driver = "authenc(hmac-sha384-lib,cts(cbc(aes-generic)))",
 		.test = alg_test_aead,
+		.fips_allowed = 1,
 		.suite = {
 			.aead = __VECS(krb5_test_aes256_cts_hmac_sha384_192)
 		}
-- 
2.53.0