ctr_update
if (!ctr_update(drbg, entropy, entropylen, pers, perslen, nonce, noncelen))
if (!ctr_update(drbg, entropy, entropylen, adin, adinlen, NULL, 0))
if (!ctr_update(drbg, adin, adinlen, NULL, 0, NULL, 0))
if (!ctr_update(drbg, adin, adinlen, NULL, 0, NULL, 0))
if (!ctr_update(drbg, adin, adinlen, NULL, 0, NULL, 0))