Create OAuth Signature with HMAC-SHA1 Encryption r

Question

The Question
Hello, I need to authenticate to an API wich needs OAuth encryption.
I'm in the right direction but I am sure something is wrong with my signature base string. Since the HMACSHA1 Hash is based on a Key and BaseString, I get a wrong oauth_signature.
OAuth Signing Process

So far
I have been able to collect all the required pieces of data, which includes:

• Consumer Key
• Consumer Secret
• Acces Token
• Acces Secret
• Sha1Hased Value (Based on Key and Message, where Message is the signature Base string)
• Signature Base String

The Problem
I get a HTTP(401 Bad Request) returned because of a invalid signature.
note: I'm pretty sure it is how I build my Signature Base String. For info about the API Docs I used, please check bottom page.

The Code

GetOAuthToken (Doing the actual request)

public static string GetAuthorizationToken()
{
    string TimeInSecondsSince1970 = ((int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds).ToString();
    string Nonce = System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(TimeInSecondsSince1970
    + TimeInSecondsSince1970 + TimeInSecondsSince1970));
    HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(GetAppleApiUrl.GetUrl(AppleApiUrl.SESSION_TOKEN));
    httpWebRequest.Method = "GET";

    string consumer_secret = Uri.EscapeDataString(Settings.SettingsManager.consumer_secret);
    string token_secret = Uri.EscapeDataString(Settings.SettingsManager.access_secret);

    string signature_base_string = GetSignatureBaseString(TimeInSecondsSince1970, Nonce);
    string SHA1HASH = GetSha1Hash(consumer_secret + "&" + token_secret, signature_base_string);

    string Header =
       "OAuth realm=" + '"' + "ADM" + '"' + "," +
       "oauth_consumer_key=" + '"' + Settings.SettingsManager.consumer_key + '"' + "," +
       "oauth_token=" + '"' + Settings.SettingsManager.access_token + '"' + "," +
       "oauth_signature_method=" + '"' + "HMAC-SHA1" + '"' + "," +
       "oauth_signature= " + '"' + SHA1HASH + '"' + "," + 
       "oauth_timestamp=" + '"' + TimeInSecondsSince1970 + '"' + "," +
       "oauth_nonce=" + '"' + Nonce + '"' + "," +
       "oauth_version=" + '"' + "1.0" + '"' + ",";

    httpWebRequest.Headers.Add(HttpRequestHeader.Authorization, Header);
    var Result = httpWebRequest.GetResponse();

    return Result.ToString();
}

GetSha1Hash

public static string GetSha1Hash(string key, string message)
{
    var encoding = new System.Text.ASCIIEncoding();

    byte[] keyBytes = encoding.GetBytes(key);
    byte[] messageBytes = encoding.GetBytes(message);

    string Sha1Result = string.Empty;

    using (HMACSHA1 SHA1 = new HMACSHA1(keyBytes))
    {
        var Hashed = SHA1.ComputeHash(messageBytes);
        Sha1Result = Convert.ToBase64String(Hashed);
    }

    return Sha1Result;
}

GetSignatureBaseString

public static string GetSignatureBaseString(string TimeStamp, string Nonce)
{
    //1.Convert the HTTP Method to uppercase and set the output string equal to this value.
    string Signature_Base_String = "Get";
    Signature_Base_String = Signature_Base_String.ToUpper();

    //2.Append the ‘&’ character to the output string.
    Signature_Base_String = Signature_Base_String + "&";

    //3.Percent encode the URL and append it to the output string.
    string PercentEncodedURL = Uri.EscapeDataString(GetAppleApiUrl.GetUrl(AppleApiUrl.SESSION_TOKEN));
    Signature_Base_String = Signature_Base_String + PercentEncodedURL;

    //4.Append the ‘&’ character to the output string.
    Signature_Base_String = Signature_Base_String + "&";

    //5.append parameter string to the output string.
    Signature_Base_String = Signature_Base_String + Uri.EscapeDataString("oauth_consumer_key=" + Settings.SettingsManager.consumer_key);
    Signature_Base_String = Signature_Base_String + Uri.EscapeDataString("&oauth_token=" + Settings.SettingsManager.access_token);
    Signature_Base_String = Signature_Base_String + Uri.EscapeDataString("&oauth_signature_method=" +"HMAC-SHA1");
    Signature_Base_String = Signature_Base_String + Uri.EscapeDataString("&oauth_timestamp=" + TimeStamp);
    Signature_Base_String = Signature_Base_String + Uri.EscapeDataString("&oauth_nonce=" + Nonce);
    Signature_Base_String = Signature_Base_String + Uri.EscapeDataString("&oauth_version=" + "1.0");

    return Signature_Base_String;
}

Result (Fiddler)
API Doc

Answer 1

It looks like you should sort parameters alphabetically in Header string and within GetSignatureBaseString method as described in this comment and Twitter OAuth documentation