xor_set_peer
static OSSL_FUNC_keyexch_set_peer_fn xor_set_peer;
{ OSSL_FUNC_KEYEXCH_SET_PEER, (void (*)(void))xor_set_peer },
|| !xor_set_peer(derivectx, pxorctx->key)
|| !xor_set_peer(derivectx, peerkey)