Hidistro.Core/LicenseChecker.cs

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namespace Hidistro.Core
{
    using System;
    using System.Globalization;
    using System.IO;
    using System.Runtime.InteropServices;
    using System.Security.Cryptography;
    using System.Text;
    using System.Web;
    using System.Web.Caching;
    using System.Xml;

    public static class LicenseChecker
    {
        private const string CacheCommercialKey = "FileCache_CommercialLicenser";

        public static void Check(out bool isValid, out bool expired, out int siteQty)
        {
            siteQty = 0;
            isValid = false;
            expired = true;
            XmlDocument document = HiCache.Get("FileCache_CommercialLicenser") as XmlDocument;
            if (document == null)
            {
                string path = HttpContext.Current.Request.MapPath("/config/Certificates.cer");
                if (!File.Exists(path))
                {
                    return;
                }
                document = new XmlDocument();
                document.LoadXml(File.ReadAllText(path));
                HiCache.Max("FileCache_CommercialLicenser", document, new CacheDependency(path));
            }
            XmlNode node = document.DocumentElement.SelectSingleNode("//Host");
            XmlNode node2 = document.DocumentElement.SelectSingleNode("//LicenseDate");
            XmlNode node3 = document.DocumentElement.SelectSingleNode("//Expires");
            XmlNode node4 = document.DocumentElement.SelectSingleNode("//SiteQty");
            XmlNode node5 = document.DocumentElement.SelectSingleNode("//Signature");
            if (string.Compare(node.InnerText, HttpContext.Current.Request.Url.Host, true, CultureInfo.InvariantCulture) == 0)
            {
                string s = string.Format(CultureInfo.InvariantCulture, "Host={0}&Expires={1}&SiteQty={2}&LicenseDate={3}", new object[] { HttpContext.Current.Request.Url.Host, node3.InnerText, node4.InnerText, node2.InnerText });
                using (RSACryptoServiceProvider provider = new RSACryptoServiceProvider())
                {
                    provider.FromXmlString(LicenseHelper.GetPublicKey());
                    RSAPKCS1SignatureDeformatter deformatter = new RSAPKCS1SignatureDeformatter(provider);
                    deformatter.SetHashAlgorithm("SHA1");
                    byte[] rgbSignature = Convert.FromBase64String(node5.InnerText);
                    byte[] rgbHash = new SHA1Managed().ComputeHash(Encoding.UTF8.GetBytes(s));
                    isValid = deformatter.VerifySignature(rgbHash, rgbSignature);
                }
                expired = DateTime.Now > DateTime.Parse(node3.InnerText);
                if (!(!isValid ? true : expired))
                {
                    int.TryParse(node4.InnerText, out siteQty);
                }
            }
        }
    }
}