linux-kernel - [PATCH] crypto: don't raise alarm for no ctr(aes*) tests in fips mode

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Date:	Tue, 28 Apr 2009 21:18:22 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	linux-crypto@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Neil Horman <nhorman@...driver.com>
Subject: [PATCH] crypto: don't raise alarm for no ctr(aes*) tests in fips mode

Per the NIST AESAVS document, Appendix A[1], it isn't possible to
have automated self-tests for counter-mode AES, but people are
misled to believe something is wrong by the message that says there
is no test for ctr(aes). Simply suppress all 'no test for ctr(aes*'
messages if fips_enabled is set to avoid confusion.

Dependent on earlier patch 'crypto: catch base cipher self-test
failures in fips mode', which adds the test_done label.

[1] http://csrc.nist.gov/groups/STM/cavp/documents/aes/AESAVS.pdf

Signed-off-by: Jarod Wilson <jarod@...hat.com>

---
 crypto/testmgr.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 5a50416..39ffa69 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -2134,6 +2134,17 @@ int alg_test(const char *driver, const char *alg, u32 type, u32 mask)
 				      type, mask);
 	goto test_done;
 notest:
+	/*
+	 * Per NIST AESAVS[1], it isn't possible to have automated self-tests
+	 * for counter mode aes vectors, they have to be covered by ecb mode
+	 * and code inspection. The ecb mode tests are trigger above in the
+	 * CRYPTO_ALG_TYPE_CIPHER section. Suppress warnings about missing
+	 * ctr tests if we're in fips mode to avoid confusion.
+	 *
+	 * [1] http://csrc.nist.gov/groups/STM/cavp/documents/aes/AESAVS.pdf
+	 */
+	if (fips_enabled && !strncmp(alg, "ctr(aes", 7))
+		goto test_done;
 	printk(KERN_INFO "alg: No test for %s (%s)\n", alg, driver);
 test_done:
 	if (fips_enabled && rc)

-- 
Jarod Wilson
jarod@...hat.com
--
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