微信小程序，重置登录 ResetUserSessionKey接口，session_key加密生成签名，一直报无效，签名方法如下：

public static String hmacSHA256(String secret, String message) throws Exception {
    String hash = "";
    Mac hmacSha256 = Mac.getInstance("HmacSHA256");
    SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(), "HmacSHA256");
    hmacSha256.init(secret_key);

    byte[] bytes = hmacSha256.doFinal(message.getBytes());
    hash = byteArrayToHexString(bytes);
    return hash;
}
调用
HmacSHA256Util.hmacSHA256(wxResetSessionKeyInDTO.getSessionKey(),"")