spa_bits_to_base64(US msgbuf, US &response, spa_request_length(&response));
DSPA("\n\n%s authenticator: challenge response (%s)\n\n", ablock->name, msgbuf);
spa_bits_to_base64(US msgbuf, US &response, spa_request_length(&response));
DSPA("\n\n%s authenticator: challenge response (%s)\n\n", ablock->name, msgbuf);