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crypto: drbg - leave cipher handles operational 

As the DRBG does not operate on shadow copies of the DRBG instance
any more, the cipher handles only need to be allocated once during
initalization time and deallocated during uninstantiate time.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stephan Mueller 2015-04-18 19:37:00 +02:00 committed by Herbert Xu
parent 76899a41f8
commit fa3ae6253c
1 changed files with 4 additions and 8 deletions
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12
crypto/drbg.c
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@ -1249,11 +1249,6 @@ static int drbg_generate(struct drbg_state *drbg,
if ((drbg_max_requests(drbg)) < drbg->reseed_ctr)
drbg->seeded = false;
/* allocate cipher handle */
len = drbg->d_ops->crypto_init(drbg);
if (len)
goto err;
if (drbg->pr || !drbg->seeded) {
pr_devel("DRBG: reseeding before generation (prediction "
"resistance: %s, state %s)\n",
@ -1325,7 +1320,6 @@ static int drbg_generate(struct drbg_state *drbg,
*/
len = 0;
err:
drbg->d_ops->crypto_fini(drbg);
return len;
}
@ -1424,9 +1418,10 @@ static int drbg_instantiate(struct drbg_state *drbg, struct drbg_string *pers,
if (drbg->d_ops->crypto_init(drbg))
goto err;
ret = drbg_seed(drbg, pers, false);
drbg->d_ops->crypto_fini(drbg);
if (ret)
if (ret) {
drbg->d_ops->crypto_fini(drbg);
goto err;
}
mutex_unlock(&drbg->drbg_mutex);
return 0;
@ -1450,6 +1445,7 @@ unlock:
static int drbg_uninstantiate(struct drbg_state *drbg)
{
mutex_lock(&drbg->drbg_mutex);
drbg->d_ops->crypto_fini(drbg);
drbg_dealloc_state(drbg);
/* no scrubbing of test_data -- this shall survive an uninstantiate */
mutex_unlock(&drbg->drbg_mutex);