Fix orphan !

Cargo.lock

@@ -6778,6 +6778,7 @@ dependencies = [
  "rand 0.8.5",
  "rand_chacha 0.3.1",
  "serde",
+ "sphinx-packet",
  "thiserror 2.0.11",
  "wasm-bindgen",
 ]
@@ -6832,6 +6833,7 @@ name = "nym-sphinx-framing"
 version = "0.1.0"
 dependencies = [
  "bytes",
+ "cfg-if",
  "log",
  "nym-metrics",
  "nym-sphinx-acknowledgements",

common/nymsphinx/anonymous-replies/Cargo.toml

@@ -12,6 +12,7 @@ rand = { workspace = true }
 bs58 = { workspace = true }
 serde = { workspace = true }
 thiserror = { workspace = true }
+sphinx-packet = { workspace = true }
 
 nym-crypto = { path = "../../crypto", features = ["stream_cipher", "rand"] }
 nym-sphinx-addressing = { path = "../addressing" }

common/nymsphinx/anonymous-replies/src/reply_surb.rs

@@ -7,11 +7,12 @@ use nym_sphinx_addressing::clients::Recipient;
 use nym_sphinx_addressing::nodes::{NymNodeRoutingAddress, MAX_NODE_ADDRESS_UNPADDED_LEN};
 use nym_sphinx_params::packet_sizes::PacketSize;
 use nym_sphinx_params::{PacketType, ReplySurbKeyDigestAlgorithm};
-use nym_sphinx_types::{NymPacket, SURBMaterial, SphinxError, SURB};
+use nym_sphinx_types::{Destination, NymPacket, SURBMaterial, SphinxError, SURB};
 use nym_topology::{NymRouteProvider, NymTopologyError};
 use rand::{CryptoRng, RngCore};
 use serde::de::{Error as SerdeError, Visitor};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
+use sphinx_packet::route::Node;
 
 use std::fmt::{self, Formatter};
 use std::time;
@@ -83,6 +84,25 @@ impl ReplySurb {
         packet_size.plaintext_size() - ack_overhead - ReplySurbKeyDigestAlgorithm::output_size() - 1
     }
 
+    pub fn construct_with_route<R>(
+        rng: &mut R,
+        destination: Destination,
+        average_delay: time::Duration,
+        route: &[Node],
+    ) -> Result<Self, NymTopologyError>
+    where
+        R: RngCore + CryptoRng,
+    {
+        let delays = nym_sphinx_routing::generate_hop_delays(average_delay, route.len());
+        let surb_material = SURBMaterial::new(route.to_vec(), delays, destination);
+
+        // this can't fail as we know we have a valid route to gateway and have correct number of delays
+        Ok(ReplySurb {
+            surb: surb_material.construct_SURB().unwrap(),
+            encryption_key: SurbEncryptionKey::new(rng),
+        })
+    }
+
     // TODO: should this return `ReplySURBError` for consistency sake
     // or keep `NymTopologyError` because it's the only error it can actually return?
     pub fn construct<R>(
@@ -123,11 +143,15 @@ impl ReplySurb {
 
     pub fn to_bytes(&self) -> Vec<u8> {
         // KEY || SURB_BYTES
-        self.encryption_key
+        let bytes: Vec<u8> = self.encryption_key
             .to_bytes()
             .into_iter()
             .chain(self.surb.to_bytes())
-            .collect()
+            .collect();
+
+        assert_eq!(bytes.len(), ReplySurb::serialized_len());
+
+        bytes
     }
 
     pub fn from_bytes(bytes: &[u8]) -> Result<Self, ReplySurbError> {

common/nymsphinx/anonymous-replies/src/requests.rs

@@ -170,6 +170,7 @@ impl RepliableMessage {
     }
 
     pub fn try_from_bytes(bytes: &[u8]) -> Result<Self, InvalidReplyRequestError> {
+        // println!("Trying to deserialize message: {} bytes", bytes.len());
         if bytes.len() < SENDER_TAG_SIZE + 1 {
             return Err(InvalidReplyRequestError::RequestTooShortToDeserialize);
         }

common/nymsphinx/framing/Cargo.toml

@@ -9,6 +9,7 @@ repository = { workspace = true }
 
 [dependencies]
 bytes = { workspace = true }
+cfg-if = { workspace = true }
 tokio-util = { workspace = true, features = ["codec"] }
 thiserror = { workspace = true }
 log = { workspace = true }
@@ -20,5 +21,8 @@ nym-metrics = { path = "../../nym-metrics" }
 nym-sphinx-addressing = { path = "../addressing" }
 nym-sphinx-acknowledgements = { path = "../acknowledgements" }
 
+[features]
+no-acks = []
+
 [dev-dependencies]
 tokio = { workspace = true, features = ["full"] }

common/nymsphinx/framing/src/processing.rs

@@ -230,8 +230,12 @@ fn split_into_ack_and_message(
         | PacketSize::ExtendedPacket32
         | PacketSize::OutfoxRegularPacket => {
             trace!("received a normal packet!");
-            let (ack_data, message) = split_hop_data_into_ack_and_message(data, packet_type)?;
+            cfg_if::cfg_if! {
-            let (ack_first_hop, ack_packet) =
+                if #[cfg(feature = "no-acks")] {
+                    return Ok((None, data));
+                } else {
+                    let (ack_data, message) = split_hop_data_into_ack_and_message(data, packet_type)?;
+                    let (ack_first_hop, ack_packet) =
                 match SurbAck::try_recover_first_hop_packet(&ack_data, packet_type) {
                     Ok((first_hop, packet)) => (first_hop, packet),
                     Err(err) => {
@@ -239,8 +243,10 @@ fn split_into_ack_and_message(
                         return Err(err.into());
                     }
                 };
-            let forward_ack = MixPacket::new(ack_first_hop, ack_packet, packet_type);
+                    let forward_ack = MixPacket::new(ack_first_hop, ack_packet, packet_type);
-            Ok((Some(forward_ack), message))
+                    Ok((Some(forward_ack), message))
+                }
+            }
         }
     }
 }