static int Hash_DBRG_Reseed(RNG* rng, byte* entropy, word32 entropySz)
{
byte seed[DBRG_SEED_LEN];
Hash_df(rng, seed, sizeof(seed), dbrgInitV, rng->V, sizeof(rng->V),
entropy, entropySz, NULL, 0);
XMEMCPY(rng->V, seed, sizeof(rng->V));
XMEMSET(seed, 0, sizeof(seed));
Hash_df(rng, rng->C, sizeof(rng->C), dbrgInitC, rng->V, sizeof(rng->V),
NULL, 0, NULL, 0);
rng->reseed_ctr = 1;
return 0;
}
/* Returns: DRBG_SUCCESS or DRBG_FAILURE */
static int Hash_DRBG_Reseed(RNG* rng, const byte* entropy, word32 entropySz)
{
byte seed[DRBG_SEED_LEN];
if (Hash_df(rng, seed, sizeof(seed), drbgReseed, rng->V, sizeof(rng->V),
entropy, entropySz) != DRBG_SUCCESS) {
return DRBG_FAILURE;
}
XMEMCPY(rng->V, seed, sizeof(rng->V));
XMEMSET(seed, 0, sizeof(seed));
if (Hash_df(rng, rng->C, sizeof(rng->C), drbgInitC, rng->V,
sizeof(rng->V), NULL, 0) != DRBG_SUCCESS) {
return DRBG_FAILURE;
}
rng->reseedCtr = 1;
return DRBG_SUCCESS;
}
/* Returns: DRBG_SUCCESS or DRBG_FAILURE */
static int Hash_DRBG_Reseed(DRBG* drbg, const byte* entropy, word32 entropySz)
{
byte seed[DRBG_SEED_LEN];
if (Hash_df(drbg, seed, sizeof(seed), drbgReseed, drbg->V, sizeof(drbg->V),
entropy, entropySz) != DRBG_SUCCESS) {
return DRBG_FAILURE;
}
XMEMCPY(drbg->V, seed, sizeof(drbg->V));
ForceZero(seed, sizeof(seed));
if (Hash_df(drbg, drbg->C, sizeof(drbg->C), drbgInitC, drbg->V,
sizeof(drbg->V), NULL, 0) != DRBG_SUCCESS) {
return DRBG_FAILURE;
}
drbg->reseedCtr = 1;
drbg->lastBlock = 0;
drbg->matchCount = 0;
return DRBG_SUCCESS;
}