bits_len
bits_len(orig_key));
bits_len(orig_key), 0);
bits_len(orig_key), 1);
nbits = bits_len(p->key);
bits_getbuf(key), BITS2BYTES(bits_len(key)),
bits_getbuf(info), BITS2BYTES(bits_len(info)))) {
kg->kg_sharedlen == bits_len(sk->key) &&
bits_getbuf(kg->kg_salt), BITS2BYTES(bits_len(kg->kg_salt)),
BITS2BYTES(bits_len(kg->kg_salt)),
size_t bits_len(bits_t *);