From b51fba365980525ffd7269f56b10908c53d929ee Mon Sep 17 00:00:00 2001
From: Xeophon <508704820@qq.com>
Date: Wed, 13 May 2026 02:04:38 +0800
Subject: [PATCH] FIX(#4852): move hmac import to module level and fix
 NameError crash

- Added hmac to module-level imports (was only in demo function)
- Removed broken 'if hmac in dir()' fallback that never executed
- Removed redundant import hmac in demo function
- generate_mutation_seed() no longer crashes with NameError
---
 rips/rustchain-core/src/mutator_oracle/multi_arch_oracles.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/rips/rustchain-core/src/mutator_oracle/multi_arch_oracles.py b/rips/rustchain-core/src/mutator_oracle/multi_arch_oracles.py
index 5f51f3a15..0a4a50bc9 100644
--- a/rips/rustchain-core/src/mutator_oracle/multi_arch_oracles.py
+++ b/rips/rustchain-core/src/mutator_oracle/multi_arch_oracles.py
@@ -51,6 +51,7 @@
 import hashlib
 import struct
 import secrets
+import hmac
 import time
 from datetime import datetime
 
@@ -289,7 +290,7 @@ def generate_mutation_seed(self, block_height: int) -> Optional[MultiArchMutatio
             final_seed,
             b''.join(a.encode() for a in sorted(contributions.keys())),
             hashlib.sha256
-        ).digest() if 'hmac' in dir() else hashlib.sha256(final_seed).digest()
+        ).digest()
 
         seed = MultiArchMutationSeed(
             seed=final_seed,