Use 64 byte preimage.

Author: tnull

lightning/src/ln/channelmanager.rs

@@ -2747,9 +2747,9 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 	pub fn send_probe_payment(&self, route: &Route) -> Result<(PaymentHash, PaymentId), PaymentSendFailure> {
 		let payment_id = PaymentId(self.keys_manager.get_secure_random_bytes());
 
-		let mut preimage = [0u8; 32];
-		preimage[..16].copy_from_slice(&self.probing_cookie_secret[..16]);
-		preimage[16..].copy_from_slice(&payment_id.0[..16]);
+		let mut preimage = [0u8; 64];
+		preimage[..32].copy_from_slice(&self.probing_cookie_secret);
+		preimage[32..].copy_from_slice(&payment_id.0);
 
 		let payment_hash = PaymentHash(Sha256::hash(&preimage).into_inner());
 
@@ -2768,9 +2768,9 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 	/// Returns whether a payment with the given [`PaymentHash`] and [`PaymentId`] is, in fact, a
 	/// payment probe.
 	pub fn payment_is_probe(&self, payment_hash: PaymentHash, payment_id: PaymentId) -> bool {
-		let mut preimage = [0u8; 32];
-		preimage[..16].copy_from_slice(&self.probing_cookie_secret[..16]);
-		preimage[16..].copy_from_slice(&payment_id.0[..16]);
+		let mut preimage = [0u8; 64];
+		preimage[..32].copy_from_slice(&self.probing_cookie_secret);
+		preimage[32..].copy_from_slice(&payment_id.0);
 		let target_payment_hash = PaymentHash(Sha256::hash(&preimage).into_inner());
 		target_payment_hash == payment_hash
 	}