Authentication failed: Invalid signature.

[Roman Chyzh]

Currently I am trying to get some companies using your API and geo-endpoint.

I've  added lat and lon as query parameters to request url. And also have added api_key, timestamp and signature to query... 

As result I get error :

"response": {

    "status": 500,

    "seconds": 0.105,

    "errors": [

      {

        "msg": "Authentication failed: Invalid signature.",

        "code": 21

      }

    ]

  }

What is wrong? Cause previously generation of signature works fine...

Here is code-sample that generates signature (C# code)

using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

public static void Main()

{

var apikey = "testApiKey";

var secretKey = "someSecretKey";

var timestamp = DateTime.UtcNow.ToString("yyyyMMddHHmmssffff");

var sign = ToMD5(apikey + ":" + secretKey + ":" + timestamp);

Console.WriteLine("api_key={0}&timestamp={1}&signature={2}", apikey, timestamp, sign);

}

public static string ToMD5(string value, bool upperCase = true, string additionalString = null)

{

byte[] hash;

using (MD5 md5 = MD5.Create())

{

hash = md5.ComputeHash(Encoding.UTF8.GetBytes(value + additionalString));

}

return ToHex(hash,upperCase);

}

public static string ToHex(byte[] bytes, bool upperCase)

{

var result = new StringBuilder(bytes.Length * 2);

foreach (byte @byte in bytes)

{

result.Append(@byte.ToString(upperCase ? "X2" : "x2"));

}

return result.ToString();

}

}