TLS_AAD_SPACE_SIZE
#define TLS_MAX_AAD_SIZE TLS_AAD_SPACE_SIZE
char aad_space[TLS_AAD_SPACE_SIZE];
aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
buf_len = cipher_desc->salt + cipher_desc->iv + TLS_AAD_SPACE_SIZE +
dummy_buf = aad + TLS_AAD_SPACE_SIZE;
sg_set_buf(sg_in, aad, TLS_AAD_SPACE_SIZE);
sg_set_buf(sg_out, aad, TLS_AAD_SPACE_SIZE);
prot->aad_size = TLS_AAD_SPACE_SIZE;