Add decentralized similarity routing

crates/federation-net/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "federation-net"
-version = "0.2.0"
+version = "0.3.0"
 description = "Generic peer-to-peer networking engine built on Iroh"
 readme = "README.md"
 documentation = "https://docs.rs/federation-net"

crates/federation-net/src/engine.rs

@@ -8,7 +8,7 @@ use std::time::Duration;
 
 use iroh::endpoint::{Connection, RecvStream, SendStream, VarInt, presets};
 use iroh::protocol::{AcceptError, ProtocolHandler, Router};
-use iroh::{Endpoint, EndpointAddr, EndpointId, SecretKey};
+use iroh::{Endpoint, EndpointAddr, EndpointId, SecretKey, Signature};
 use serde::Serialize;
 use serde::de::DeserializeOwned;
 use tokio::sync::{Semaphore, mpsc, watch};
@@ -1041,6 +1041,15 @@ impl<M: Message> NetworkEngine<M> {
         self.shared.endpoint.id()
     }
 
+    /// Signs application data with this peer's persistent transport identity.
+    ///
+    /// The secret key never leaves the engine. Protocols can attach the
+    /// returned signature to records that may be forwarded by other peers;
+    /// recipients verify it against [`Self::endpoint_id`].
+    pub fn sign_identity(&self, message: &[u8]) -> Signature {
+        self.shared.endpoint.secret_key().sign(message)
+    }
+
     /// Returns the network this engine participates in.
     pub fn network_id(&self) -> NetworkId {
         self.shared.config.network_id

crates/federation-net/src/lib.rs

@@ -78,6 +78,6 @@ pub use ticket::{PeerTicket, TICKET_VERSION};
 
 // Re-exported Iroh types that appear in the public API.
 pub use iroh::endpoint::{RecvStream, SendStream};
-pub use iroh::{EndpointAddr, EndpointId, SecretKey};
+pub use iroh::{EndpointAddr, EndpointId, SecretKey, Signature};
 // Re-exported so applications can use the generic ticket helpers.
 pub use iroh_tickets::Ticket;