WhatsApp Desktop Client Code

/*
 * by Swen Kooij aka Kirk - swenkooij@gmail.com 
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Net;
using System.IO;

/// <summary>
/// A class with some functions to verify accounts, register accounts
/// </summary>
class WhatsAppHelper
{
    /// <summary>
    /// Enum that can be used to identify the Operating System of the user's device.
    /// </summary>
    public enum DeviceOS { iOS, Other };

    /// <summary>
    /// Generates a password based on the IMEI or Wifi Mac adress
    /// </summary>
    /// <param name="ImeiMac">The IMEI number or the Wifi Mac Adress</param>
    /// <param name="OS">The mobile operating system the account was registered on.</param>
    /// <returns>The generated password</returns>
    public string generatePassword(string ImeiMac, DeviceOS OS)
    {
        if (OS == DeviceOS.iOS)
        {
            return md5(ImeiMac + ImeiMac);
        }
        else
        {
            return md5(ImeiMac.ToArray().Reverse().ToString());
        }
    }

    /// <summary>
    /// Checks if the account really exists
    /// </summary>
    /// <param name="Phonenumber">The phone number including the country code (eg: +316112233344)</param>
    /// <param name="Password">The password of the whatsapp account</param>
    /// <returns>True on existance and false when non-existent</returns>
    public bool verifyAccount(string Phonenumber, string Password)
    {
        // Extract country code (first 3 characters of phone number - +)
        string CountryCode = Phonenumber.Substring(0, 3).Replace("+", "");
        Phonenumber = Phonenumber.Replace("+" + CountryCode, "0");

        // Get page
        string Html = httpGet("https://r.whatsapp.net/v1/exist.php?cc=" + CountryCode + "&in=" + Phonenumber + "&udid=" + Password);

        // Verify
        if (Html.Contains("<response status=\"ok\""))
            return true;
        else
            return false;
    }

    /// <summary>
    /// Makes a HTTP Get request to specified URL
    /// </summary>
    /// <param name="Url">The URL the request needs to be made at</param>
    /// <param name="Timeout">Timeout specified in mili-seconds</param>
    /// <returns>The body of the request (string)</returns>
    private string httpGet(string Url, int Timeout)
    {
        try
        {
            System.Windows.Forms.MessageBox.Show(Url);
            HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(Url);
            Request.Method = "GET";
            Request.Timeout = Timeout;

            HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
            StreamReader Reader = new StreamReader(Response.GetResponseStream());
            return Reader.ReadToEnd();
        }
        catch (Exception e)
        {
            throw e;
        }
    }

    /// <summary>
    /// Makes a HTTP Get request to specified URL
    /// </summary>
    /// <param name="Url">The URL the request needs to be made at</param>
    /// <returns>The body of the request (string)</returns>
    public string httpGet(string Url)
    {
        return httpGet(Url, 3000000);
    }

    /// <summary>
    /// Generates a MD5 hash from a string
    /// </summary>
    /// <param name="input">The string that needs to be hashed</param>
    /// <returns>The MD5 hash in a string.</returns>
    public string md5(string input)
    {
        MD5 md5 = MD5.Create();
        byte[] inputBytes = Encoding.ASCII.GetBytes(input);
        byte[] hash = md5.ComputeHash(inputBytes);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < hash.Length; i++)
        {
            sb.Append(hash[i].ToString("X2"));
        }
        return sb.ToString().ToLower();
    }
}