From c79acc0e083322d2769f18389cd37ef04d6982e6 Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@electriccoin.co>
Date: Thu, 12 Aug 2021 13:40:56 +0100
Subject: [PATCH] Fix length of output Vec for `SharedSecret::batch_to_affine`

It was too long, and `group::Curve::batch_normalize` panics if its
inputs are not the same length (which would be the case if a batch
included an output with an invalid `ephemeral_key`).
---
 src/keys.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/keys.rs b/src/keys.rs
index 4ed263a9..5ea66bd2 100644
--- a/src/keys.rs
+++ b/src/keys.rs
@@ -573,7 +573,7 @@ impl SharedSecret {
             .iter()
             .filter_map(|s| s.as_ref().map(|s| *(s.0)))
             .collect();
-        let mut secrets_affine = vec![pallas::Affine::identity(); shared_secrets.len()];
+        let mut secrets_affine = vec![pallas::Affine::identity(); secrets.len()];
         group::Curve::batch_normalize(&secrets, &mut secrets_affine);
         secrets_affine
     }