Spawn key pair worker on launch

talpid-core/src/tunnel_state_machine/mod.rs

@@ -25,6 +25,7 @@ use talpid_routing::RouteManagerHandle;
 #[cfg(target_os = "macos")]
 use talpid_tunnel::TunnelMetadata;
 use talpid_tunnel::{tun_provider::TunProvider, TunnelEvent};
+use talpid_tunnel_config_client::classic_mceliece::{spawn_keypair_worker, BUFSIZE, KEYPAIR_RX};
 #[cfg(target_os = "macos")]
 use talpid_types::ErrorExt;
 

talpid-tunnel-config-client/src/classic_mceliece.rs

@@ -10,22 +10,22 @@ const STACK_SIZE: usize = 2 * 1024 * 1024;
 
 /// Number of McEliece key pairs to buffer. Note that, using the below algorithm, they take up around
 /// 537 kB each. We therefore only buffer two, which is the largest useful amount, in case of multihop.
-const BUFSIZE: usize = 2;
+pub const BUFSIZE: usize = 2;
 
 /// Use the smallest CME variant with NIST security level 3. This variant has significantly smaller
 /// keys than the larger variants, and is considered safe.
 pub const ALGORITHM_NAME: &str = "Classic-McEliece-460896f-round3";
 
 type KeyPair = (PublicKey<'static>, SecretKey<'static>);
 
-static KEYPAIR_RX: OnceLock<Mutex<mpsc::Receiver<KeyPair>>> = OnceLock::new();
+pub static KEYPAIR_RX: OnceLock<Mutex<mpsc::Receiver<KeyPair>>> = OnceLock::new();
 
 /// Spawn a worker that pre computes `bufsize` McEliece key pairs in a separate thread, which can be
 /// fetched asynchronously using the returned channel.
 ///
 /// As it can take upwards of 200 ms to generate McEliece key pairs, it needs to be done before we
 /// start connecting to the tunnel.
-fn spawn_keypair_worker(bufsize: usize) -> mpsc::Receiver<KeyPair> {
+pub fn spawn_keypair_worker(bufsize: usize) -> mpsc::Receiver<KeyPair> {
     // As one of the key pairs will be buffered by the stack of the spawned thread, we reduce the
     // capacity of the channel by one
     let bufsize = bufsize.checked_sub(1).expect("bufsize must be at least 1");

talpid-tunnel-config-client/src/lib.rs

@@ -12,7 +12,7 @@ use tonic::transport::Endpoint;
 use tower::service_fn;
 use zeroize::Zeroize;
 
-mod classic_mceliece;
+pub mod classic_mceliece;
 mod ml_kem;
 #[cfg(not(target_os = "ios"))]
 mod socket;