From c7abfa8eb1aaf9df56ab34884645c575d442980b Mon Sep 17 00:00:00 2001
From: fcarreiro <facundo@aztecprotocol.com>
Date: Wed, 27 May 2026 16:11:55 +0000
Subject: [PATCH] chore(foundation): return pre-allocated ZERO_BUFFER in field
 toBuffer

---
 yarn-project/foundation/src/curves/bn254/field.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/yarn-project/foundation/src/curves/bn254/field.ts b/yarn-project/foundation/src/curves/bn254/field.ts
index 54048344f24f..8583acf2b530 100644
--- a/yarn-project/foundation/src/curves/bn254/field.ts
+++ b/yarn-project/foundation/src/curves/bn254/field.ts
@@ -25,6 +25,7 @@ type DerivedField<T extends BaseField> = {
  */
 abstract class BaseField {
   static SIZE_IN_BYTES = 32;
+  private static readonly ZERO_BUFFER = Buffer.alloc(BaseField.SIZE_IN_BYTES);
   private readonly asBigInt: bigint;
 
   /**
@@ -67,7 +68,10 @@ abstract class BaseField {
    * Converts the bigint to a Buffer.
    */
   toBuffer(): Buffer {
-    return toBufferBE(this.asBigInt, 32);
+    if (this.asBigInt === 0n) {
+      return BaseField.ZERO_BUFFER;
+    }
+    return toBufferBE(this.asBigInt, BaseField.SIZE_IN_BYTES);
   }
 
   toString(): `0x${string}` {