tcp_ao_digest_size
.outlen = htons(tcp_ao_digest_size(mkt) * 8), /* in bits */
*traffic_key = kmalloc(tcp_ao_digest_size(*key), GFP_ATOMIC);
key.traffic_key = kmalloc(tcp_ao_digest_size(key.ao_key), GFP_ATOMIC);
.outlen = htons(tcp_ao_digest_size(mkt) * 8), /* in bits */
key.traffic_key = kmalloc(tcp_ao_digest_size(key.ao_key), GFP_ATOMIC);