Vuforia Cloud中的授权失败

Question

我用C＃语言编写。我在c＃上重写了Java示例中的代码，但是，当我尝试发送请求并获得响应时，我收到身份验证失败（401）（签名身份验证失败）的信息。自动化本身看起来像： 授权：VWS {provision_access_key}：{签名} 获得签名的位置：

Signature = Base64(HMAC-SHA1(server_secret_key, StringToSign ) ) ;
StringToSign =
HTTP-Verb + "\n" +
Content-MD5 + "\n" +
Content-Type + "\n" +
Date + "\n" +
Request-Path;

在代码中，我具有函数setHeaders，这是用于请求的函数集标头，她看起来是这样的：

        public void setHeaders(HttpWebRequest request)
    {
        string secret_key = "da6048fa067245b751a1d7ca5dca61b4ca751ac7";
        string access_key = "e34c6fe8a8ad99c48e436791c863a738df2b9113";
        SignatureBuilder sc = new SignatureBuilder();
        request.Date = DateTime.UtcNow.ToUniversalTime();
        request.Headers.Add("Autorization", "VWS" + access_key + ":" + sc.tmsSignature(request, secret_key));
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream stream = request.GetRequestStream();
        stream = response.GetResponseStream();
        StreamReader reader = new StreamReader(stream);
        Console.WriteLine(reader.ReadToEnd());
    }

我有SignatureBuilder类，其中定义了函数tmsSignature,ContentMD5,CalculateRFC2104HMAC。

    class SignatureBuilder
{
    public string tmsSignature(HttpWebRequest request, string seckretKey)
    {
        WebClient webClient = new WebClient();

        string method = request.Method;
        request.Date = Convert.ToDateTime(DateTime.UtcNow.ToString("R"));
        string ContentType = "";
        string HexDigest = "d41d8cd98f00b204e9800998ecf8427e";//for request types without request body include the MD5 hash of an empty string which is “d41d8cd98f00b204e9800998ecf8427e”.
        if (method.Equals("GET", StringComparison.OrdinalIgnoreCase) || method.Equals("DELETE", StringComparison.OrdinalIgnoreCase))
        { }
        else if (method.Equals("POST", StringComparison.OrdinalIgnoreCase) || method.Equals("PUT", StringComparison.OrdinalIgnoreCase))
        {
            ContentType = "application/json";
            HexDigest = contentMD5(request);
        }
        else
        { System.Console.WriteLine("Error: invalid content type passed to Sig Builder"); }
        string dateValue = request.Date.ToString("R");
        Console.WriteLine(dateValue);
        string requestPath = request.RequestUri.ToString();
        string toDigest = method + '\n' + HexDigest + '\n' + ContentType + '\n' + dateValue + '\n' + requestPath;
        Console.WriteLine(toDigest);
        string shaHashed = "";
        try
        {
            shaHashed = CalculateRFC2104HMAC(seckretKey, toDigest);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
        return shaHashed;
    }

    private string contentMD5(HttpWebRequest request)//Compute hash md5
    {
        byte[] buffer = new byte[16];
        using (Stream stream = request.GetRequestStream())
        {
            stream.Write(buffer, 0, 16);
        }
        byte[] hash = Encoding.UTF8.GetBytes(Encoding.UTF8.GetString(buffer));
        MD5 md5 = new MD5CryptoServiceProvider();
        byte[] hashenc = md5.ComputeHash(hash);
        string result = "";
        foreach (var b in hashenc)
        {
            result += b.ToString("x2");
        }
        Console.WriteLine(result);
        return result;
    }
    public static string CalculateRFC2104HMAC(string key, string data)//Compute hash base 64 with HMACSHA1
    {
        UTF8Encoding utf8 = new UTF8Encoding();
        string result = "";
        var sha = KeyedHashAlgorithm.Create("HMACSHA1");
        sha.Key = Encoding.UTF8.GetBytes(key);
        result = Convert.ToBase64String(sha.ComputeHash(System.Text.Encoding.UTF8.GetBytes(data)));
        Console.ForegroundColor = ConsoleColor.White;
        Console.WriteLine(result);
        Console.ResetColor();
        return result;
    }
}

但是，如果我尝试发送get或post请求，我总是会收到错误身份验证失败。也许每个人都会发现隐藏错误在哪里？

        static void Main(string[] args)
    {
        HttpWebRequest qwe = (HttpWebRequest)WebRequest.Create("https://vws.vuforia.com/targets");
        qwe.Method = "GET";

        PostNewTarget postNewTarget = new PostNewTarget();
        postNewTarget.setHeaders(qwe);

    }