GoEasy-OTP - C#生成GoEasy-OTP

C#

    public string goEasyOTP(string secretKey)
    {
        string otp = null;
        byte[] encrypted = null;
        string currentTimeMills=string.Format("000{0}",(long)(DateTime.UtcNow-new
        DateTime(1970,1,1,0,0,0,DateTimeKind.Utc)).TotalMilliseconds);
        //"0001490325990593"
        byte[] byteSecretKey = Encoding.ASCII.GetBytes(secretKey);
        using (AesManaged aesAlg = new AesManaged(){Key = byteSecretKey,Mode = CipherMode.ECB,Padding = PaddingMode.None})
        {
        ICryptoTransform encryptor = aesAlg.CreateEncryptor();
        using (MemoryStream msEncrypt = new MemoryStream())
            {
            using(CryptoStream csEncrypt = new CryptoStream(msEncrypt,encryptor,CryptoStreamMode.Write))
                {
                    using(StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        swEncrypt.Write(currentTimeMills);
                    }
                    encrypted = msEncrypt.ToArray();
                }
            }
        }
        otp = Convert.ToBase64String(encrypted);
        return otp;
    }