perf(sandbox): optimize code encryption handling

sandbox/app/core/encryption.py

@@ -12,9 +12,10 @@ def encrypt_code(code: bytes, key: bytes) -> str:
     Returns:
         Base64 encoded encrypted code
     """
+    key_length = len(key)
     encrypted_code = bytearray(len(code))
     for i in range(len(code)):
-        encrypted_code[i] = code[i] ^ key[i % 64]
+        encrypted_code[i] = code[i] ^ key[i % key_length]
     encoded_code = base64.b64encode(encrypted_code).decode("utf-8")
     return encoded_code
 

sandbox/app/core/runners/python/prescript.py

@@ -17,7 +17,7 @@ sys.excepthook = excepthook
 # Load security library if available
 lib = ctypes.CDLL("./libpython.so")
 lib.init_seccomp.argtypes = [ctypes.c_uint32, ctypes.c_uint32, ctypes.c_bool]
-lib.init_seccomp.restype = None
+lib.init_seccomp.restype = None  # TODO: raise error info
 
 # Get running path
 running_path = sys.argv[1]