{ERR_FUNC(FIPS_F_FIPS_CIPHERINIT), "FIPS_CIPHERINIT"},
{ERR_FUNC(FIPS_F_FIPS_DIGESTINIT), "FIPS_DIGESTINIT"},
{ERR_FUNC(FIPS_F_FIPS_DRBG_BYTES), "FIPS_DRBG_BYTES"},
+{ERR_FUNC(FIPS_F_FIPS_DRBG_CHECK), "FIPS_DRBG_CHECK"},
{ERR_FUNC(FIPS_F_FIPS_DRBG_CPRNG_TEST), "FIPS_DRBG_CPRNG_TEST"},
{ERR_FUNC(FIPS_F_FIPS_DRBG_GENERATE), "FIPS_drbg_generate"},
{ERR_FUNC(FIPS_F_FIPS_DRBG_HEALTH_CHECK), "FIPS_DRBG_HEALTH_CHECK"},
#define FIPS_F_FIPS_CIPHERINIT 109
#define FIPS_F_FIPS_DIGESTINIT 110
#define FIPS_F_FIPS_DRBG_BYTES 111
+#define FIPS_F_FIPS_DRBG_CHECK 146
#define FIPS_F_FIPS_DRBG_CPRNG_TEST 112
#define FIPS_F_FIPS_DRBG_GENERATE 113
#define FIPS_F_FIPS_DRBG_HEALTH_CHECK 114
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)
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,
{
int r = 0;
+ if (!fips_drbg_check(dctx))
+ return 0;
+
if (dctx->status != DRBG_STATUS_READY
&& dctx->status != DRBG_STATUS_RESEED)
{
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)
void FIPS_drbg_set_app_data(DRBG_CTX *ctx, void *app_data);
size_t FIPS_drbg_get_blocklength(DRBG_CTX *dctx);
int FIPS_drbg_get_strength(DRBG_CTX *dctx);
+void FIPS_drbg_set_check_interval(DRBG_CTX *dctx, int interval);
DRBG_CTX *FIPS_get_default_drbg(void);
const RAND_METHOD *FIPS_drbg_method(void);
*/
#define DRBG_MAX_BLOCK EVP_MAX_MD_SIZE
+#define DRBG_HEALTH_INTERVAL (1 << 24)
+
/* DRBG context structure */
struct drbg_ctx_st
int type;
/* Various flags */
unsigned int flags;
+ /* Used for periodic health checks */
+ int health_check_cnt, health_check_interval;
/* The following parameters are setup by mechanism drbg_init() call */
int strength;