generar api key y api secret en HmacSHA256 y cifrarlas en java

public String generateApiKeyAndCipher(String apiKey, String apiSecret) {
        String apiKeyAndSecret = apiKey + "-" + apiSecret;
        String cipherApiKeyAndSecret = null;
        try {
            cipherApiKeyAndSecret = CipherUtil.encrypt(CipherUtil.ENCRYPTION_KEY, apiKeyAndSecret);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return cipherApiKeyAndSecret;
    }