entpool_extract
entpool_extract(&pool, &randhole, sizeof randhole);
entpool_extract(&pool, &randva, sizeof randva);
entpool_extract(&pool, &randhole, sizeof randhole);
entpool_extract(&pool, &randva, sizeof randva);
entpool_extract(&pool, buf, sizeof buf);
entpool_extract(ec->ec_pool, buf, sizeof buf);
entpool_extract(&E->pool, buf, len);
entpool_extract(ec->ec_pool, buf, sizeof buf);
entpool_extract(P, KAT_ACTUAL, KATLEN); \
entpool_extract(P, scratch, RATE-1 + 1);
entpool_extract(P, scratch, 1);
void entpool_extract(struct entpool *, void *, size_t);