C# Mashape Authentication

gistfile1.cs

// Put the "header" value into a "X-Mashape-Authorization" header before making the HTTP request


// Util functions to generate a HMAC_SHA1 hash and Base64 encode a value

private static String hmac_sha1(String publicKey, String privateKey) {
    System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
    byte[] privateKeyBytes = encoding.GetBytes(privateKey);
    byte[] publicKeyBytes = encoding.GetBytes(publicKey);

    HMACSHA1 hmacsha1 = new HMACSHA1(privateKeyBytes);
   
    byte[] hash = hmacsha1.ComputeHash(publicKeyBytes);
    return BitConverter.ToString(hash).Replace("-","").ToLower();
}

private static String EncodeTo64(string toEncode)
{
    byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
    String returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
    return returnValue;
}

// Sample code using the functions above

static void Main(string[] args)
{
    String publicKey = "PUBLIC_KEY";
    String hash = hmac_sha1(publicKey, "PRIVATE_KEY");

    // Here we go, this is the final header value generated according to the spec: http://www.mashape.com/docs/consume/rest
    String header = EncodeTo64(publicKey + ":" + hash);


    // For example, let's use the header value above in the following GET request
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("URL");
    // Set the header
    request.Headers.Add("X-Mashape-Authorization", header);
    HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse();
    StreamReader resStream = new StreamReader(httpResponse.GetResponseStream());
    // This is the response stream converted to String
    String stringResponse = resStream.ReadToEnd();
}