- unsigned char *nonce = NULL, *entropy = NULL;
- size_t noncelen = 0, entropylen = 0;
-
- if (perslen > drbg->max_perslen) {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- RAND_R_PERSONALISATION_STRING_TOO_LONG);
- goto end;
- }
-
- if (drbg->meth == NULL)
- {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- RAND_R_NO_DRBG_IMPLEMENTATION_SELECTED);
- goto end;
- }
-
- if (drbg->state != DRBG_UNINITIALISED) {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- drbg->state == DRBG_ERROR ? RAND_R_IN_ERROR_STATE
- : RAND_R_ALREADY_INSTANTIATED);
- goto end;
- }
-
- drbg->state = DRBG_ERROR;
- if (drbg->get_entropy != NULL)
- entropylen = drbg->get_entropy(drbg, &entropy, drbg->strength,
- drbg->min_entropylen, drbg->max_entropylen);
- if (entropylen < drbg->min_entropylen
- || entropylen > drbg->max_entropylen) {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_RETRIEVING_ENTROPY);
- goto end;
- }
-
- if (drbg->max_noncelen > 0 && drbg->get_nonce != NULL) {
- noncelen = drbg->get_nonce(drbg, &nonce, drbg->strength / 2,
- drbg->min_noncelen, drbg->max_noncelen);
- if (noncelen < drbg->min_noncelen || noncelen > drbg->max_noncelen) {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- RAND_R_ERROR_RETRIEVING_NONCE);
- goto end;
- }
- }
-
- if (!drbg->meth->instantiate(drbg, entropy, entropylen,
- nonce, noncelen, pers, perslen)) {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE, RAND_R_ERROR_INSTANTIATING_DRBG);
- goto end;
- }
-
- drbg->state = DRBG_READY;
- drbg->generate_counter = 0;
- drbg->reseed_time = time(NULL);
- if (drbg->reseed_counter > 0) {
- if (drbg->parent == NULL)
- drbg->reseed_counter++;
- else
- drbg->reseed_counter = drbg->parent->reseed_counter;
- }
-
-end:
- if (entropy != NULL && drbg->cleanup_entropy != NULL)
- drbg->cleanup_entropy(drbg, entropy, entropylen);
- if (nonce != NULL && drbg->cleanup_nonce!= NULL )
- drbg->cleanup_nonce(drbg, nonce, noncelen);
- if (drbg->pool != NULL) {
- if (drbg->state == DRBG_READY) {
- RANDerr(RAND_F_RAND_DRBG_INSTANTIATE,
- RAND_R_ERROR_ENTROPY_POOL_WAS_IGNORED);
- drbg->state = DRBG_ERROR;
- }
- RAND_POOL_free(drbg->pool);
- drbg->pool = NULL;
- }
- if (drbg->state == DRBG_READY)
- return 1;
- return 0;