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authorStephan Mueller <smueller@chronox.de>2019-05-08 17:19:24 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2019-05-23 09:01:06 +0300
commitdb07cd26ac6a418dc2823187958edcfdb415fa83 (patch)
tree7b9edef481bf6ab03778a904078ac6020bfeb237 /include/crypto/drbg.h
parenta7cd942bb6e3559d86257fe3b57844e55341a3a0 (diff)
downloadlinux-db07cd26ac6a418dc2823187958edcfdb415fa83.tar.xz
crypto: drbg - add FIPS 140-2 CTRNG for noise source
FIPS 140-2 section 4.9.2 requires a continuous self test of the noise source. Up to kernel 4.8 drivers/char/random.c provided this continuous self test. Afterwards it was moved to a location that is inconsistent with the FIPS 140-2 requirements. The relevant patch was e192be9d9a30555aae2ca1dc3aad37cba484cd4a . Thus, the FIPS 140-2 CTRNG is added to the DRBG when it obtains the seed. This patch resurrects the function drbg_fips_continous_test that existed some time ago and applies it to the noise sources. The patch that removed the drbg_fips_continous_test was b3614763059b82c26bdd02ffcb1c016c1132aad0 . The Jitter RNG implements its own FIPS 140-2 self test and thus does not need to be subjected to the test in the DRBG. The patch contains a tiny fix to ensure proper zeroization in case of an error during the Jitter RNG data gathering. Signed-off-by: Stephan Mueller <smueller@chronox.de> Reviewed-by: Yann Droneaud <ydroneaud@opteya.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto/drbg.h')
-rw-r--r--include/crypto/drbg.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 3fb581bf3b87..8c9af21efce1 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -129,6 +129,8 @@ struct drbg_state {
bool seeded; /* DRBG fully seeded? */
bool pr; /* Prediction resistance enabled? */
+ bool fips_primed; /* Continuous test primed? */
+ unsigned char *prev; /* FIPS 140-2 continuous test value */
struct work_struct seed_work; /* asynchronous seeding support */
struct crypto_rng *jent;
const struct drbg_state_ops *d_ops;