From a169d8a1c5017ca073b8c9b863620bfdbd7f52f5 Mon Sep 17 00:00:00 2001
From: daxpedda <daxpedda@gmail.com>
Date: Sun, 1 Aug 2021 01:40:59 +0200
Subject: [PATCH] Fix small numbers (#221)

---
 src/map_to_curve.rs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/map_to_curve.rs b/src/map_to_curve.rs
index 630329a..baa9ff1 100644
--- a/src/map_to_curve.rs
+++ b/src/map_to_curve.rs
@@ -77,11 +77,14 @@ impl GroupWithMapToCurve for p256_::ProjectivePoint {
 
         let uniform_bytes = expand_message_xmd::<H>(input, dst, crate::group::p256::L)?;
         #[allow(clippy::borrow_interior_mutable_const)]
-        let bytes =
-            BigInt::from_bytes_be(Sign::Plus, &uniform_bytes).mod_floor(&crate::group::p256::R);
+        let mut bytes = BigInt::from_bytes_be(Sign::Plus, &uniform_bytes)
+            .mod_floor(&crate::group::p256::R)
+            .to_bytes_be()
+            .1;
+        bytes.resize(32, 0);
 
         Ok(p256_::Scalar::from_bytes_reduced(GenericArray::from_slice(
-            &bytes.to_bytes_be().1,
+            &bytes,
         )))
     }
 }