code: def process_wide(cls) -> RSAPrivateKey:
      if cls._process_wide_key is None:
          with cls._process_wide_key_lock:
              if cls._process_wide_key is None:
                  cls._process_wide_key = cls()
      return cls._process_wide_key
  
imports: from __future__ import annotations
  import base64
  import threading
  from abc import ABC, abstractmethod
  from cryptography import exceptions
  from cryptography.hazmat.primitives import hashes, serialization
  from cryptography.hazmat.primitives.asymmetric import padding, rsa
label_desc: Use image node_id 2 for calling the RSAPrivateKey obj's underlying member method code with example usage: obj.process_wide(cls) and returns: cls