#cert_args = " ".join(['--trusted-pem %s' % x for x in trusted_certs])
#command = '{} --verify --node-id "{}" {} {} 2>&1'.\
# format(self.xmlsec_path, ref, cert_args, filename)
#cert_args = " ".join(['--trusted-pem %s' % x for x in trusted_certs])
#command = '{} --verify --node-id "{}" {} {} 2>&1'.\
# format(self.xmlsec_path, ref, cert_args, filename)