Welcome to the Kelkoo Group Customer Service

Signing URL – C#

This example illustrates how to sign request URL’s using .NET C#. To use this sample you need the latest version of the .NET framework.


Name Type Summary
domain string The protocol + domain of the web service you are calling. ex. http://uk.shoppingapis.kelkoo.com
path string The path + query string of the web service you are calling. ex. /V3/productSearch?query=ipod
id string Your authentication ID provided to you by Kelkoo.
key string Your authentication key provided to you by Kelkoo.

Don’t forget to encode the values in your query string. In .NET C# you can use Server.UrlEncode(string url).

Sample Class

Top level Elements

 using System;
 using System.IO;
 using System.Text;
 using System.Security.Cryptography;
namespace Kelkoo
public static class RequestSigner
public static string Sign(string domain, string path, string id, string key)
 /// Get Timestamp
 int timestamp = (int)(((int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds));
// Clean up path
 path = path.Replace(" ", "+");
// Get url
 string url = path + "&aid=" + auth_id + "&timestamp=" + timestamp;
// Get url+key byte array
 byte[] tokken = Encoding.GetEncoding("iso-8859-1").GetBytes(url + auth_key);
// Get MD5 instance
 MD5 md5 = MD5CryptoServiceProvider.Create();
// Compute MD5 hash
 byte[] md5tokken = md5.ComputeHash(tokken);
//Convert to base 64 string
 string base64tokken = Convert.ToBase64String(md5tokken);
// Clean up tokken
 base64tokken = base64tokken.Replace("+", ".").Replace("/", "_").Replace("=", "-");
// return signed url;
 return domain + url + "&hash=" + base64tokken;


Call: RequestSigner.Sign("http://fr.shoppingapis.kelkoo.com", "/V3/productSearch?query=sony","96912377", "KeyOfPartner96912377");

Output: 'http://fr.shoppingapis.kelkoo.com/V3/productSearch?query=sony&aid=96912377&timestamp=1166428730&hash=oVsgSMxjHws4UVgPzxklmw--'


Download a full sample class: