uint8_t ntru_rand_default_init(NtruRandContext *rand_ctx, struct NtruRandGen *rand_gen) {
uint8_t result = 1;
result &= nist_ctr_initialize() == 0;
rand_ctx->state = malloc(sizeof(NIST_CTR_DRBG));
if (!rand_ctx->state)
return 0;
uint8_t entropy[32];
result &= ntru_get_entropy(entropy, 32);
uint16_t pers_string_size = strlen(NTRU_PERS_STRING) * sizeof(NTRU_PERS_STRING[0]);
result &= nist_ctr_drbg_instantiate(rand_ctx->state, entropy, 10, NULL, 0, NTRU_PERS_STRING, pers_string_size) == 0;
return result;
}
struct cprng_strong *
cprng_strong_create(const char *name, int ipl, int flags)
{
const uint32_t cc = cprng_counter();
struct cprng_strong *const cprng = kmem_alloc(sizeof(*cprng),
KM_SLEEP);
/*
* rndsink_request takes a spin lock at IPL_VM, so we can be no
* higher than that.
*/
KASSERT(ipl != IPL_SCHED && ipl != IPL_HIGH);
/* Initialize the easy fields. */
(void)strlcpy(cprng->cs_name, name, sizeof(cprng->cs_name));
cprng->cs_flags = flags;
mutex_init(&cprng->cs_lock, MUTEX_DEFAULT, ipl);
cv_init(&cprng->cs_cv, cprng->cs_name);
selinit(&cprng->cs_selq);
cprng->cs_rndsink = rndsink_create(NIST_BLOCK_KEYLEN_BYTES,
&cprng_strong_rndsink_callback, cprng);
/* Get some initial entropy. Record whether it is full entropy. */
uint8_t seed[NIST_BLOCK_KEYLEN_BYTES];
mutex_enter(&cprng->cs_lock);
cprng->cs_ready = rndsink_request(cprng->cs_rndsink, seed,
sizeof(seed));
if (nist_ctr_drbg_instantiate(&cprng->cs_drbg, seed, sizeof(seed),
&cc, sizeof(cc), cprng->cs_name, sizeof(cprng->cs_name)))
/* XXX Fix nist_ctr_drbg API so this can't happen. */
panic("cprng %s: NIST CTR_DRBG instantiation failed",
cprng->cs_name);
explicit_memset(seed, 0, sizeof(seed));
if (ISSET(flags, CPRNG_HARD))
cprng->cs_remaining = NIST_BLOCK_KEYLEN_BYTES;
else
cprng->cs_remaining = 0;
if (!cprng->cs_ready && !ISSET(flags, CPRNG_INIT_ANY))
printf("cprng %s: creating with partial entropy\n",
cprng->cs_name);
mutex_exit(&cprng->cs_lock);
return cprng;
}
