我需要帮助aws s3休息授权。
我有下一个代码：

string url = "http://fxstestcandles.cloudapp.net/pairs/history/eurusd";
        HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
        request.Method = "GET";
        WebHeaderCollection headers = (request as HttpWebRequest).Headers;
        string httpDate = DateTime.UtcNow.ToString("ddd, dd MMM yyyy HH:mm:ss ") + "+0000";

        string canonicalString = "GET\n\n\n " + httpDate + "\n/";
        Encoding ae = new UTF8Encoding();
        HMACSHA1 signature = new HMACSHA1();
        signature.Key = ae.GetBytes("551a656b548e8466f555d540156b5a");
        byte[] bytes  = ae.GetBytes(canonicalString);
        byte[] moreBytes = signature.ComputeHash(bytes);
        string encodedCanonical = Convert.ToBase64String(moreBytes);
        headers.Add("Authorization", "AWS " + "25496a25b6554f54b5e6" + ":" + encodedCanonical);
        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
        Stream stream =  response.GetResponseStream() as Stream;
        byte[] buffer = new byte[32 * 1024];
        int nRead =0;

        MemoryStream ms = new MemoryStream();
        do
        {
            nRead = stream.Read(buffer, 0, buffer.Length);
            ms.Write(buffer, 0, nRead);
        } while (nRead > 0);

        ASCIIEncoding encoding = new ASCIIEncoding();
        string responseString = encoding.GetString(ms.ToArray());
        System.Console.Write(responseString);

我需要帮助，我遇到下一个错误：（403）禁止。
按照此链接上的步骤完成身份验证：http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html。凭据为：公钥：25496a25b6554f54b5e6私钥：551a656b548e8466f555d540156b5a您只需要使用SHA1的日期，而不需要使用整个请求字符串。日期：2007年3月26日星期一19：37：58 +0000授权人：例如：从九月八日起，每日一次，每日一次