witness_hash_djb2
hash = witness_hash_djb2(key, 0) % w_hash.wh_size;
hash = witness_hash_djb2(w->w_name, 0) % w_hash.wh_size;
static uint32_t witness_hash_djb2(const uint8_t *key, uint32_t size);
hash = witness_hash_djb2((const char *)&key,
hash = witness_hash_djb2((const char *)&key,