append_data
append_data(desc, ctx->key + ctx->cdata.keylen, 4);
append_data(desc, req->iv, ivsize);
append_data(desc, data, len);
append_data(desc, data, data_len); \
append_data(desc, &data, sizeof(data)); \
append_data(desc, adata->key_virt, adata->keylen);