From 4536e09c99da93bf4f4617ba286ce974300b10e0 Mon Sep 17 00:00:00 2001
From: Dan Cline <6798349+Rjected@users.noreply.github.com>
Date: Thu, 20 Oct 2022 04:26:08 -0400
Subject: [PATCH] feat(primitives): use with_capacity for sighash (#108)

---
 crates/primitives/src/transaction/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/primitives/src/transaction/mod.rs b/crates/primitives/src/transaction/mod.rs
index 3603cd587..78fe80bb2 100644
--- a/crates/primitives/src/transaction/mod.rs
+++ b/crates/primitives/src/transaction/mod.rs
@@ -130,7 +130,7 @@ impl Transaction {
     /// Heavy operation that return hash over rlp encoded transaction.
     /// It is only used for signature signing.
     pub fn signature_hash(&self) -> TxHash {
-        let mut encoded = vec![];
+        let mut encoded = Vec::with_capacity(self.length());
         self.encode(&mut encoded);
         keccak256(encoded).into()
     }