Merge pull request #2661 from TheBlueMatt/2023-10-dup-claim-chan-hang

[rust-lightning] / lightning / src / blinded_path / mod.rs

diff --git a/lightning/src/blinded_path/mod.rs b/lightning/src/blinded_path/mod.rs
index 89bf7ce5d2f405c4ab7dd87e9ae5347875ad99a1..1415836c01fee6cacaa8d2808f28d6d9ecfba37a 100644 (file)
--- a/lightning/src/blinded_path/mod.rs
+++ b/lightning/src/blinded_path/mod.rs
@@ -56,15 +56,22 @@ pub struct BlindedHop {
 }
 
 impl BlindedPath {
+       /// Create a one-hop blinded path for a message.
+       pub fn one_hop_for_message<ES: EntropySource + ?Sized, T: secp256k1::Signing + secp256k1::Verification>(
+               recipient_node_id: PublicKey, entropy_source: &ES, secp_ctx: &Secp256k1<T>
+       ) -> Result<Self, ()> {
+               Self::new_for_message(&[recipient_node_id], entropy_source, secp_ctx)
+       }
+
        /// Create a blinded path for an onion message, to be forwarded along `node_pks`. The last node
        /// pubkey in `node_pks` will be the destination node.
        ///
-       /// Errors if less than two hops are provided or if `node_pk`(s) are invalid.
+       /// Errors if no hops are provided or if `node_pk`(s) are invalid.
        //  TODO: make all payloads the same size with padding + add dummy hops
-       pub fn new_for_message<ES: EntropySource, T: secp256k1::Signing + secp256k1::Verification>
-               (node_pks: &[PublicKey], entropy_source: &ES, secp_ctx: &Secp256k1<T>) -> Result<Self, ()>
-       {
-               if node_pks.len() < 2 { return Err(()) }
+       pub fn new_for_message<ES: EntropySource + ?Sized, T: secp256k1::Signing + secp256k1::Verification>(
+               node_pks: &[PublicKey], entropy_source: &ES, secp_ctx: &Secp256k1<T>
+       ) -> Result<Self, ()> {
+               if node_pks.is_empty() { return Err(()) }
                let blinding_secret_bytes = entropy_source.get_secure_random_bytes();
                let blinding_secret = SecretKey::from_slice(&blinding_secret_bytes[..]).expect("RNG is busted");
                let introduction_node_id = node_pks[0];