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Add periodic DRBG health checks as required by SP800-90.

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This commit is contained in:
Dr. Stephen Henson
2011-04-20 17:06:38 +00:00
parent 8da18ea1a5
commit 14264b19de
5 changed files with 36 additions and 0 deletions
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29
fips/rand/fips_drbg_lib.c
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@@ -71,6 +71,9 @@ int FIPS_drbg_init(DRBG_CTX *dctx, int type, unsigned int flags)
dctx->flags = flags;
dctx->type = type;
dctx->health_check_cnt = 0;
dctx->health_check_interval = DRBG_HEALTH_INTERVAL;
rv = fips_drbg_hash_init(dctx);
if (rv == -2)
@@ -277,6 +280,24 @@ int FIPS_drbg_reseed(DRBG_CTX *dctx,
return 0;
}
static int fips_drbg_check(DRBG_CTX *dctx)
{
if (dctx->flags & DRBG_FLAG_TEST)
return 1;
dctx->health_check_cnt++;
if (dctx->health_check_cnt >= dctx->health_check_interval)
{
DRBG_CTX tctx;
if (!fips_drbg_kat(&tctx, dctx->type,
dctx->flags | DRBG_FLAG_TEST))
{
FIPSerr(FIPS_F_FIPS_DRBG_CHECK, FIPS_R_SELFTEST_FAILURE);
return 0;
}
dctx->health_check_cnt = 0;
}
return 1;
}
int FIPS_drbg_generate(DRBG_CTX *dctx, unsigned char *out, size_t outlen,
int strength, int prediction_resistance,
@@ -284,6 +305,9 @@ int FIPS_drbg_generate(DRBG_CTX *dctx, unsigned char *out, size_t outlen,
{
int r = 0;
if (!fips_drbg_check(dctx))
return 0;
if (dctx->status != DRBG_STATUS_READY
&& dctx->status != DRBG_STATUS_RESEED)
{
@@ -408,6 +432,11 @@ int FIPS_drbg_get_strength(DRBG_CTX *dctx)
return dctx->strength;
}
void FIPS_drbg_set_check_interval(DRBG_CTX *dctx, int interval)
{
dctx->health_check_interval = interval;
}
static int drbg_stick = 0;
void FIPS_drbg_stick(void)