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authorStephan Mueller <smueller@chronox.de>2015-05-25 16:09:59 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2015-05-27 12:51:53 +0300
commitb8ec5ba42c4a3854e27c44e697d9b4f0b84b32bb (patch)
tree45522a56a48f8391f925689f78333a5344977a75 /include/crypto
parent4c7879907eddd5b3ec09489bc980aab4f44e38dd (diff)
downloadlinux-b8ec5ba42c4a3854e27c44e697d9b4f0b84b32bb.tar.xz
crypto: drbg - use Jitter RNG to obtain seed
During initialization, the DRBG now tries to allocate a handle of the Jitter RNG. If such a Jitter RNG is available during seeding, the DRBG pulls the required entropy/nonce string from get_random_bytes and concatenates it with a string of equal size from the Jitter RNG. That combined string is now the seed for the DRBG. Written differently, the initial seed of the DRBG is now: get_random_bytes(entropy/nonce) || jitterentropy (entropy/nonce) If the Jitter RNG is not available, the DRBG only seeds from get_random_bytes. CC: Andreas Steffen <andreas.steffen@strongswan.org> CC: Theodore Ts'o <tytso@mit.edu> CC: Sandy Harris <sandyinchina@gmail.com> Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/drbg.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 46994b25dc85..c3f208dc83ee 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -123,6 +123,7 @@ struct drbg_state {
struct work_struct seed_work; /* asynchronous seeding support */
u8 *seed_buf; /* buffer holding the seed */
size_t seed_buf_len;
+ struct crypto_rng *jent;
const struct drbg_state_ops *d_ops;
const struct drbg_core *core;
struct drbg_string test_data;