CEPH_GCM_KEY_LEN
if (con_secret_len < CEPH_GCM_KEY_LEN + 2 * CEPH_GCM_IV_LEN) {
ret = crypto_aead_setkey(con->v2.gcm_tfm, con_secret, CEPH_GCM_KEY_LEN);
memcpy(&con->v2.in_gcm_nonce, con_secret + CEPH_GCM_KEY_LEN,
con_secret + CEPH_GCM_KEY_LEN + CEPH_GCM_IV_LEN,