public class CryptoUtils {
    private static final String SHA_256 = "SHA-256";
    private static final String HMAC_SHA_256 = "HmacSHA256";

    private CryptoUtils() {
    }

    /**
     * SHA-256 加密算法
     */
    public static String sha256(String message) {
        String res;
        try {
            MessageDigest messageDigest = MessageDigest.getInstance(SHA_256);
            byte[] hash = messageDigest.digest(message.getBytes(StandardCharsets.UTF_8));
            res = Hex.encodeHexString(hash);
        } catch (NoSuchAlgorithmException e) {
            return null;
        }
        return res;
    }

    /**
     * HMAC-SHA256 签名算法
     */
    public static String hmacSha256(String secret, String message) {
        String res;
        try {
            Mac mac = Mac.getInstance(HMAC_SHA_256);
            SecretKey secretKey = new SecretKeySpec(secret.getBytes(), HMAC_SHA_256);
            mac.init(secretKey);
            byte[] hash = mac.doFinal(message.getBytes());
            res = Hex.encodeHexString(hash);
        } catch (Exception e) {
            return null;
        }
        return res;
    }
}