'Return a single encryption item.'

def show(self, req, type_id, id):

    context = req.environ['cinder.context']
    authorize(context)
    self._check_type(context, type_id)
    encryption_specs = self._get_volume_type_encryption(context, type_id)
    if (id not in encryption_specs):
        raise exception.VolumeTypeEncryptionNotFound(type_id=type_id)
    return {id: encryption_specs[id]}
