Rename TxCreationKeys::new to not conflict w/ auto-gen'd C bindings

The C bindings automatically create a _new() function for structs
which contain only pub fields which we know how to map. This
conflicts with the actual TxCreationKeys::new() function, so we
simply rename it to capture its nature as a derivation function.

Author: TheBlueMatt

lightning/src/ln/chan_utils.rs

@@ -358,7 +358,7 @@ impl_writeable!(ChannelPublicKeys, 33*5, {
 
 impl TxCreationKeys {
 	/// Create a new TxCreationKeys from channel base points and the per-commitment point
-	pub fn new<T: secp256k1::Signing + secp256k1::Verification>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, a_delayed_payment_base: &PublicKey, a_htlc_base: &PublicKey, b_revocation_base: &PublicKey, b_htlc_base: &PublicKey) -> Result<TxCreationKeys, SecpError> {
+	pub fn derive_new<T: secp256k1::Signing + secp256k1::Verification>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, a_delayed_payment_base: &PublicKey, a_htlc_base: &PublicKey, b_revocation_base: &PublicKey, b_htlc_base: &PublicKey) -> Result<TxCreationKeys, SecpError> {
 		Ok(TxCreationKeys {
 			per_commitment_point: per_commitment_point.clone(),
 			revocation_key: derive_public_revocation_key(&secp_ctx, &per_commitment_point, &b_revocation_base)?,

lightning/src/ln/channel.rs

@@ -1126,7 +1126,7 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
 		let htlc_basepoint = &self.local_keys.pubkeys().htlc_basepoint;
 		let their_pubkeys = self.their_pubkeys.as_ref().unwrap();
 
-		Ok(secp_check!(TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, delayed_payment_base, htlc_basepoint, &their_pubkeys.revocation_basepoint, &their_pubkeys.htlc_basepoint), "Local tx keys generation got bogus keys".to_owned()))
+		Ok(secp_check!(TxCreationKeys::derive_new(&self.secp_ctx, &per_commitment_point, delayed_payment_base, htlc_basepoint, &their_pubkeys.revocation_basepoint, &their_pubkeys.htlc_basepoint), "Local tx keys generation got bogus keys".to_owned()))
 	}
 
 	#[inline]
@@ -1140,7 +1140,7 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
 		let htlc_basepoint = &self.local_keys.pubkeys().htlc_basepoint;
 		let their_pubkeys = self.their_pubkeys.as_ref().unwrap();
 
-		Ok(secp_check!(TxCreationKeys::new(&self.secp_ctx, &self.their_cur_commitment_point.unwrap(), &their_pubkeys.delayed_payment_basepoint, &their_pubkeys.htlc_basepoint, revocation_basepoint, htlc_basepoint), "Remote tx keys generation got bogus keys".to_owned()))
+		Ok(secp_check!(TxCreationKeys::derive_new(&self.secp_ctx, &self.their_cur_commitment_point.unwrap(), &their_pubkeys.delayed_payment_basepoint, &their_pubkeys.htlc_basepoint, revocation_basepoint, htlc_basepoint), "Remote tx keys generation got bogus keys".to_owned()))
 	}
 
 	/// Gets the redeemscript for the funding transaction output (ie the funding transaction output
@@ -4674,7 +4674,7 @@ mod tests {
 		let per_commitment_secret = SecretKey::from_slice(&hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
 		let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
 		let htlc_basepoint = &chan.local_keys.pubkeys().htlc_basepoint;
-		let keys = TxCreationKeys::new(&secp_ctx, &per_commitment_point, delayed_payment_base, htlc_basepoint, &their_pubkeys.revocation_basepoint, &their_pubkeys.htlc_basepoint).unwrap();
+		let keys = TxCreationKeys::derive_new(&secp_ctx, &per_commitment_point, delayed_payment_base, htlc_basepoint, &their_pubkeys.revocation_basepoint, &their_pubkeys.htlc_basepoint).unwrap();
 
 		chan.their_pubkeys = Some(their_pubkeys);
 

lightning/src/ln/functional_tests.rs

@@ -1636,7 +1636,7 @@ fn test_fee_spike_violation_fails_htlc() {
 	// Assemble the set of keys we can use for signatures for our commitment_signed message.
 	let commitment_secret = SecretKey::from_slice(&remote_secret1).unwrap();
 	let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &commitment_secret);
-	let commit_tx_keys = chan_utils::TxCreationKeys::new(&secp_ctx, &per_commitment_point, &remote_delayed_payment_basepoint,
+	let commit_tx_keys = chan_utils::TxCreationKeys::derive_new(&secp_ctx, &per_commitment_point, &remote_delayed_payment_basepoint,
 		&remote_htlc_basepoint, &local_revocation_basepoint, &local_htlc_basepoint).unwrap();
 
 	// Build the remote commitment transaction so we can sign it, and then later use the

lightning/src/ln/onchaintx.rs

@@ -583,7 +583,7 @@ impl<ChanSigner: ChannelKeys> OnchainTxHandler<ChanSigner> {
 			for (i, (outp, per_outp_material)) in cached_claim_datas.per_input_material.iter().enumerate() {
 				match per_outp_material {
 					&InputMaterial::Revoked { ref per_commitment_point, ref remote_delayed_payment_base_key, ref remote_htlc_base_key, ref per_commitment_key, ref input_descriptor, ref amount, ref htlc, ref on_remote_tx_csv } => {
-						if let Ok(chan_keys) = TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, remote_delayed_payment_base_key, remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) {
+						if let Ok(chan_keys) = TxCreationKeys::derive_new(&self.secp_ctx, &per_commitment_point, remote_delayed_payment_base_key, remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) {
 
 							let witness_script = if let Some(ref htlc) = *htlc {
 								chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &chan_keys.a_htlc_key, &chan_keys.b_htlc_key, &chan_keys.revocation_key)
@@ -607,7 +607,7 @@ impl<ChanSigner: ChannelKeys> OnchainTxHandler<ChanSigner> {
 						}
 					},
 					&InputMaterial::RemoteHTLC { ref per_commitment_point, ref remote_delayed_payment_base_key, ref remote_htlc_base_key, ref preimage, ref htlc } => {
-						if let Ok(chan_keys) = TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, remote_delayed_payment_base_key, remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) {
+						if let Ok(chan_keys) = TxCreationKeys::derive_new(&self.secp_ctx, &per_commitment_point, remote_delayed_payment_base_key, remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) {
 							let witness_script = chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &chan_keys.a_htlc_key, &chan_keys.b_htlc_key, &chan_keys.revocation_key);
 
 							if !preimage.is_some() { bumped_tx.lock_time = htlc.cltv_expiry }; // Right now we don't aggregate time-locked transaction, if we do we should set lock_time before to avoid breaking hash computation

lightning/src/util/enforcing_trait_impls.rs

@@ -46,12 +46,12 @@ impl EnforcingChannelKeys {
 	                                                               keys: &TxCreationKeys) {
 		let remote_points = self.inner.remote_pubkeys();
 
-		let keys_expected = TxCreationKeys::new(secp_ctx,
-		                                        &keys.per_commitment_point,
-		                                        &remote_points.delayed_payment_basepoint,
-		                                        &remote_points.htlc_basepoint,
-		                                        &self.inner.pubkeys().revocation_basepoint,
-		                                        &self.inner.pubkeys().htlc_basepoint).unwrap();
+		let keys_expected = TxCreationKeys::derive_new(secp_ctx,
+		                                               &keys.per_commitment_point,
+		                                               &remote_points.delayed_payment_basepoint,
+		                                               &remote_points.htlc_basepoint,
+		                                               &self.inner.pubkeys().revocation_basepoint,
+		                                               &self.inner.pubkeys().htlc_basepoint).unwrap();
 		if keys != &keys_expected { panic!("derived different per-tx keys") }
 	}
 }