code: def serialize_raw_master_key_prefix(raw_master_key):
      
      if raw_master_key.config.wrapping_key.wrapping_algorithm.encryption_type is EncryptionType.ASYMMETRIC:
          return to_bytes(raw_master_key.key_id)
      return struct.pack(
          ">{}sII".format(len(raw_master_key.key_id)),
          to_bytes(raw_master_key.key_id),
          # Tag Length is stored in bits, not bytes
          raw_master_key.config.wrapping_key.wrapping_algorithm.algorithm.tag_len * 8,
          raw_master_key.config.wrapping_key.wrapping_algorithm.algorithm.iv_len,
      )
docs: Produces the prefix that a RawMasterKey will always use for the
      key_info value of keys which require additional information.
  
      :param raw_master_key: RawMasterKey for which to produce a prefix
      :type raw_master_key: aws_encryption_sdk.key_providers.raw.RawMasterKey
      :returns: Serialized key_info prefix
      :rtype: bytes