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Perform health check on all reseed operations not associated with

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prediction resistance requests. Although SP 800-90 is arguably unclear
on whether this is necessary adding an additional check has minimal
penalty (very few applications will make an explicit reseed request).
This commit is contained in:
Dr. Stephen Henson 2011-09-21 18:24:12 +00:00
parent 4420b3b17a
commit 05272d4c51
2 changed files with 26 additions and 7 deletions
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28
fips/rand/fips_drbg_lib.c
View File

@ -273,8 +273,8 @@ int FIPS_drbg_instantiate(DRBG_CTX *dctx,
}
int FIPS_drbg_reseed(DRBG_CTX *dctx,
const unsigned char *adin, size_t adinlen)
static int drbg_reseed(DRBG_CTX *dctx,
const unsigned char *adin, size_t adinlen, int hcheck)
{
unsigned char *entropy = NULL;
size_t entlen;
@ -303,6 +303,17 @@ int FIPS_drbg_reseed(DRBG_CTX *dctx,
}
dctx->status = DRBG_STATUS_ERROR;
/* Peform health check on all reseed operations if not a prediction
* resistance request and not in test mode.
*/
if (hcheck && !(dctx->xflags & DRBG_FLAG_TEST))
{
if (!FIPS_drbg_test(dctx))
{
r = FIPS_R_SELFTEST_FAILURE;
goto end;
}
}
entlen = fips_get_entropy(dctx, &entropy, dctx->strength,
dctx->min_entropy, dctx->max_entropy);
@ -333,6 +344,12 @@ int FIPS_drbg_reseed(DRBG_CTX *dctx,
return 0;
}
int FIPS_drbg_reseed(DRBG_CTX *dctx,
const unsigned char *adin, size_t adinlen)
{
return drbg_reseed(dctx, adin, adinlen, 1);
}
static int fips_drbg_check(DRBG_CTX *dctx)
{
if (dctx->xflags & DRBG_FLAG_TEST)
@ -340,7 +357,7 @@ static int fips_drbg_check(DRBG_CTX *dctx)
dctx->health_check_cnt++;
if (dctx->health_check_cnt >= dctx->health_check_interval)
{
if (FIPS_drbg_test(dctx) <= 0)
if (!FIPS_drbg_test(dctx))
{
FIPSerr(FIPS_F_FIPS_DRBG_CHECK, FIPS_R_SELFTEST_FAILURE);
dctx->status = DRBG_STATUS_ERROR;
@ -389,7 +406,10 @@ int FIPS_drbg_generate(DRBG_CTX *dctx, unsigned char *out, size_t outlen,
if (dctx->status == DRBG_STATUS_RESEED || prediction_resistance)
{
if (!FIPS_drbg_reseed(dctx, adin, adinlen))
/* If prediction resistance request don't do health check */
int hcheck = prediction_resistance ? 0 : 1;
if (!drbg_reseed(dctx, adin, adinlen, hcheck))
{
r = FIPS_R_RESEED_ERROR;
goto end;

5
fips/rand/fips_drbg_selftest.c
View File

@ -772,9 +772,8 @@ int fips_drbg_kat(DRBG_CTX *dctx, int nid, unsigned int flags)
{
if (td->nid == nid && td->flags == flags)
{
rv = fips_drbg_single_kat(dctx, td, 0);
if (rv <= 0)
return rv;
if (!fips_drbg_single_kat(dctx, td, 0))
return 0;
return fips_drbg_health_check(dctx, td);
}
}