From 06c23368f2522f1f3f4ba93734ffd365c8d059d2 Mon Sep 17 00:00:00 2001
From: Luke Parker <lukeparker5132@gmail.com>
Date: Wed, 6 Mar 2024 21:37:40 -0500
Subject: [PATCH] Mitigate https://github.com/serai-dex/serai/issues/539 by
 making keystore deterministic

---
 substrate/node/src/keystore.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/substrate/node/src/keystore.rs b/substrate/node/src/keystore.rs
index 333cd9c3..ca00e79b 100644
--- a/substrate/node/src/keystore.rs
+++ b/substrate/node/src/keystore.rs
@@ -1,5 +1,4 @@
 use zeroize::Zeroize;
-use rand_core::RngCore;
 
 use sp_core::{crypto::*, ed25519, sr25519};
 use sp_keystore::*;
@@ -13,8 +12,7 @@ impl Keystore {
     key_hex.zeroize();
 
     assert_eq!(key.len(), 32, "KEY from environment wasn't 32 bytes");
-    key.extend([0; 32]);
-    rand_core::OsRng.fill_bytes(&mut key[32 ..]);
+    key.extend(sp_core::blake2_256(&key));
 
     let res = Self(sr25519::Pair::from(schnorrkel::SecretKey::from_bytes(&key).unwrap()));
     key.zeroize();