#include <openssl/err.h>
#include <openssl/fips_rand.h>
#include "fips_rand_lcl.h"
+#include "fips_locl.h"
typedef struct {
int nid;
size_t katlen;
} DRBG_SELFTEST_DATA;
-#define make_drbg_test_data(nid, flag, pr) { nid, flag, \
+#define make_drbg_test_data(nid, flag, pr) { nid, flag | DRBG_FLAG_TEST, \
pr##_entropyinput, sizeof(pr##_entropyinput), \
pr##_nonce, sizeof(pr##_nonce), \
pr##_personalizationstring, sizeof(pr##_personalizationstring), \
0x41,0xbe,0x14,0x87,0x81,0x08,0x0d,0xee
};
/* NB: not constant so we can corrupt it */
-static unsigned char sha512_entropyinputpr2[] =
+static const unsigned char sha512_entropyinputpr2[] =
{
0xed,0x22,0x42,0x61,0xa7,0x4c,0xed,0xc7,0x10,0x82,0x61,0x17,
0xaa,0x7d,0xdb,0x4e,0x1c,0x96,0x61,0x23,0xcd,0x8f,0x84,0x77,
static DRBG_SELFTEST_DATA drbg_test[] = {
make_drbg_test_data_df(NID_aes_128_ctr, aes_128_use_df),
make_drbg_test_data_df(NID_aes_192_ctr, aes_192_use_df),
- make_drbg_test_data_df(NID_aes_192_ctr, aes_192_use_df),
+ make_drbg_test_data_df(NID_aes_256_ctr, aes_256_use_df),
make_drbg_test_data(NID_aes_128_ctr, 0, aes_128_no_df),
make_drbg_test_data(NID_aes_192_ctr, 0, aes_192_no_df),
make_drbg_test_data(NID_aes_256_ctr, 0, aes_256_no_df),
{
const unsigned char *ent;
size_t entlen;
+ int entcnt;
const unsigned char *nonce;
size_t noncelen;
+ int noncecnt;
} TEST_ENT;
-static size_t test_entropy(DRBG_CTX *dctx, unsigned char *out,
+static size_t test_entropy(DRBG_CTX *dctx, unsigned char **pout,
int entropy, size_t min_len, size_t max_len)
{
TEST_ENT *t = FIPS_drbg_get_app_data(dctx);
- memcpy(out, t->ent, t->entlen);
+ *pout = (unsigned char *)t->ent;
+ t->entcnt++;
return t->entlen;
}
-static size_t test_nonce(DRBG_CTX *dctx, unsigned char *out,
+static size_t test_nonce(DRBG_CTX *dctx, unsigned char **pout,
int entropy, size_t min_len, size_t max_len)
{
TEST_ENT *t = FIPS_drbg_get_app_data(dctx);
- memcpy(out, t->nonce, t->noncelen);
+ *pout = (unsigned char *)t->nonce;
+ t->noncecnt++;
return t->noncelen;
}
-void FIPS_corrupt_drbg(void)
- {
- sha512_entropyinputpr2[0]++;
- }
-
static int fips_drbg_single_kat(DRBG_CTX *dctx, DRBG_SELFTEST_DATA *td)
{
TEST_ENT t;
int rv = 0;
+ size_t adinlen;
unsigned char randout[1024];
if (!FIPS_drbg_init(dctx, td->nid, td->flags))
return 0;
- if (!FIPS_drbg_set_test_mode(dctx, test_entropy, test_nonce))
+ if (!FIPS_drbg_set_callbacks(dctx, test_entropy, 0, 0, test_nonce, 0))
return 0;
FIPS_drbg_set_app_data(dctx, &t);
t.entlen = td->entlen;
t.nonce = td->nonce;
t.noncelen = td->noncelen;
+ t.entcnt = 0;
+ t.noncecnt = 0;
- if (!FIPS_drbg_instantiate(dctx, 0, td->pers, td->perslen))
+ if (!FIPS_drbg_instantiate(dctx, td->pers, td->perslen))
goto err;
t.ent = td->entpr;
t.entlen = td->entprlen;
+ /* Note for CTR without DF some additional input values
+ * ignore bytes after the keylength: so reduce adinlen
+ * to half to ensure invalid data is fed in.
+ */
+ if (!fips_post_corrupt(FIPS_TEST_DRBG, dctx->type, &dctx->flags))
+ adinlen = td->adinlen / 2;
+ else
+ adinlen = td->adinlen;
if (!FIPS_drbg_generate(dctx, randout, td->katlen, 0, 1,
- td->adin, td->adinlen))
+ td->adin, adinlen))
goto err;
t.ent = td->entg;
rv = 1;
err:
+ if (rv == 0)
+ FIPSerr(FIPS_F_FIPS_DRBG_SINGLE_KAT, FIPS_R_SELFTEST_FAILED);
FIPS_drbg_uninstantiate(dctx);
return rv;
}
+/* This is the "health check" function required by SP800-90. Induce several
+ * failure modes and check an error condition is set.
+ */
+
+static int fips_drbg_health_check(DRBG_CTX *dctx, DRBG_SELFTEST_DATA *td)
+ {
+ unsigned char randout[1024];
+ TEST_ENT t;
+ size_t i;
+ unsigned char *p = (unsigned char *)dctx;
+
+ /* Initialise DRBG */
+
+ if (!FIPS_drbg_init(dctx, td->nid, td->flags))
+ goto err;
+
+ if (!FIPS_drbg_set_callbacks(dctx, test_entropy, 0, 0, test_nonce, 0))
+ goto err;
+
+ FIPS_drbg_set_app_data(dctx, &t);
+
+ t.ent = td->ent;
+ t.entlen = td->entlen;
+ t.nonce = td->nonce;
+ t.noncelen = td->noncelen;
+ t.entcnt = 0;
+ t.noncecnt = 0;
+
+ /* Don't report induced errors */
+ dctx->flags |= DRBG_FLAG_NOERR;
+
+ /* Try too large a personalisation length */
+ if (FIPS_drbg_instantiate(dctx, td->pers, dctx->max_pers + 1) > 0)
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_PERSONALISATION_ERROR_UNDETECTED);
+ goto err;
+ }
+
+ /* Test entropy source failure detection */
+
+ t.entlen = 0;
+ if (FIPS_drbg_instantiate(dctx, td->pers, td->perslen) > 0)
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_ENTROPY_ERROR_UNDETECTED);
+ goto err;
+ }
+
+ /* Try to generate output from uninstantiated DRBG */
+ if (FIPS_drbg_generate(dctx, randout, td->katlen, 0, 0,
+ td->adin, td->adinlen))
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_GENERATE_ERROR_UNDETECTED);
+ goto err;
+ }
+
+ dctx->flags &= ~DRBG_FLAG_NOERR;
+ if (!FIPS_drbg_uninstantiate(dctx))
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_UNINSTANTIATE_ERROR);
+ goto err;
+ }
+
+ /* Instantiate with valid data. NB: errors now reported again */
+ if (!FIPS_drbg_init(dctx, td->nid, td->flags))
+ goto err;
+ if (!FIPS_drbg_set_callbacks(dctx, test_entropy, 0, 0, test_nonce, 0))
+ goto err;
+ FIPS_drbg_set_app_data(dctx, &t);
+
+ t.entlen = td->entlen;
+ if (!FIPS_drbg_instantiate(dctx, td->pers, td->perslen))
+ goto err;
+
+ /* Check generation is now OK */
+ if (!FIPS_drbg_generate(dctx, randout, td->katlen, 0, 0,
+ td->adin, td->adinlen))
+ goto err;
+
+ /* Try to generate with too high a strength.
+ */
+
+ dctx->flags |= DRBG_FLAG_NOERR;
+ if (dctx->strength != 256)
+ {
+ if (FIPS_drbg_generate(dctx, randout, td->katlen, 256, 0,
+ td->adin, td->adinlen))
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_STRENGTH_ERROR_UNDETECTED);
+
+ goto err;
+ }
+ }
+
+ /* Request too much data for one request */
+ if (FIPS_drbg_generate(dctx, randout, dctx->max_request + 1, 0, 0,
+ td->adin, td->adinlen))
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_REQUEST_LENGTH_ERROR_UNDETECTED);
+ goto err;
+ }
+
+ /* Check prediction resistance request fails if entropy source
+ * failure.
+ */
+
+ t.entlen = 0;
+
+ if (FIPS_drbg_generate(dctx, randout, td->katlen, 0, 1,
+ td->adin, td->adinlen))
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_ENTROPY_ERROR_UNDETECTED);
+ goto err;
+ }
+
+ dctx->flags &= ~DRBG_FLAG_NOERR;
+
+ if (!FIPS_drbg_uninstantiate(dctx))
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_UNINSTANTIATE_ERROR);
+ goto err;
+ }
+
+
+ /* Instantiate again with valid data */
+
+ if (!FIPS_drbg_init(dctx, td->nid, td->flags))
+ goto err;
+ if (!FIPS_drbg_set_callbacks(dctx, test_entropy, 0, 0, test_nonce, 0))
+ goto err;
+ FIPS_drbg_set_app_data(dctx, &t);
+
+ t.entlen = td->entlen;
+ /* Test reseeding works */
+ dctx->reseed_interval = 2;
+ if (!FIPS_drbg_instantiate(dctx, td->pers, td->perslen))
+ goto err;
+
+ /* Check generation is now OK */
+ if (!FIPS_drbg_generate(dctx, randout, td->katlen, 0, 0,
+ td->adin, td->adinlen))
+ goto err;
+ if (!FIPS_drbg_generate(dctx, randout, td->katlen, 0, 0,
+ td->adin, td->adinlen))
+ goto err;
+
+ /* DRBG should now require a reseed */
+ if (dctx->status != DRBG_STATUS_RESEED)
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_RESEED_COUNTER_ERROR);
+ goto err;
+ }
+
+
+ /* Generate again and check entropy has been requested for reseed */
+ t.entcnt = 0;
+ if (!FIPS_drbg_generate(dctx, randout, td->katlen, 0, 0,
+ td->adin, td->adinlen))
+ goto err;
+ if (t.entcnt != 1)
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_ENTROPY_NOT_REQUESTED_FOR_RESEED);
+ goto err;
+ }
+
+ FIPS_drbg_uninstantiate(dctx);
+ p = (unsigned char *)&dctx->d;
+ /* Standard says we have to check uninstantiate really zeroes
+ * the data...
+ */
+ for (i = 0; i < sizeof(dctx->d); i++)
+ {
+ if (*p != 0)
+ {
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_UNINSTANTIATE_ZEROISE_ERROR);
+ goto err;
+ }
+ p++;
+ }
+
+ return 1;
+
+ err:
+ /* A real error as opposed to an induced one: underlying function will
+ * indicate the error.
+ */
+ if (!(dctx->flags & DRBG_FLAG_NOERR))
+ FIPSerr(FIPS_F_FIPS_DRBG_HEALTH_CHECK, FIPS_R_FUNCTION_ERROR);
+ FIPS_drbg_uninstantiate(dctx);
+ return 0;
+
+ }
+
+
int fips_drbg_kat(DRBG_CTX *dctx, int nid, unsigned int flags)
{
+ int rv;
DRBG_SELFTEST_DATA *td;
for (td = drbg_test; td->nid != 0; td++)
{
if (td->nid == nid && td->flags == flags)
- return fips_drbg_single_kat(dctx, td);
+ {
+ rv = fips_drbg_single_kat(dctx, td);
+ if (rv <= 0)
+ return rv;
+ return fips_drbg_health_check(dctx, td);
+ }
}
return 0;
}
{
DRBG_CTX *dctx;
DRBG_SELFTEST_DATA *td;
+ int rv = 1;
dctx = FIPS_drbg_new(0, 0);
if (!dctx)
return 0;
for (td = drbg_test; td->nid != 0; td++)
+ {
+ if (!fips_post_started(FIPS_TEST_DRBG, td->nid, &td->flags))
+ return 1;
if (!fips_drbg_single_kat(dctx, td))
- break;
- if (td->nid == 0)
- return 1;
- return 0;
+ {
+ fips_post_failed(FIPS_TEST_DRBG, td->nid, &td->flags);
+ rv = 0;
+ continue;
+ }
+ if (!fips_drbg_health_check(dctx, td))
+ {
+ fips_post_failed(FIPS_TEST_DRBG, td->nid, &td->flags);
+ rv = 0;
+ continue;
+ }
+ if (!fips_post_success(FIPS_TEST_DRBG, td->nid, &td->flags))
+ return 0;
+ }
+ FIPS_drbg_free(dctx);
+ return rv;
}
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