code: def decrypt_file(filename, set_env=True, override_env=False):
      
      data = json.load(open(filename))
  
      results = {}
  
      for key, v in data.iteritems():
          v_decrypt = decrypt_secret(v)
  
          results[key] = v_decrypt
          if set_env:
              if key in os.environ and not override_env:
                  break
              os.environ[str(key)] = v_decrypt
  
      return results
docs: Decrypts a JSON file containing encrypted secrets. This file should contain an object mapping the key names to
      encrypted secrets. This encrypted file can be created using `credkeep.encrypt_file` or the commandline utility.
  
      :param filename:  filename of the JSON file
      :param set_env: If True, an environment variable representing the key is created.
      :param override_env: If True, an existing environment variable with the same key name will be overridden with the
          new decrypted value. If False, the environment variable will not be set.
      :return: Dict containing the decrypted keys