public static string GenerateLicenseBASE64String(LicenseEntity lic, byte[] certPrivateKeyData, SecureString certFilePwd)
{
//Serialize license object into XML
var _licenseObject = new XmlDocument();
using (var _writer = new StringWriter())
{
var _serializer = new XmlSerializer(typeof(LicenseEntity), new Type[] { lic.GetType() });
_serializer.Serialize(_writer, lic);
_licenseObject.LoadXml(_writer.ToString());
}
//Get RSA key from certificate
var cert = new X509Certificate2(certPrivateKeyData, certFilePwd);
var rsaKey = (RSA)cert.PrivateKey;
//Sign the XML
SignXML(_licenseObject, rsaKey);
//Convert the signed XML into BASE64 string
return(Convert.ToBase64String(Encoding.UTF8.GetBytes(_licenseObject.OuterXml)));
}
public static LicenseEntity ParseLicenseFromBASE64String(Type licenseObjType, string licenseString, byte[] certPubKeyData, out LicenseStatus licStatus)
{
licStatus = LicenseStatus.UNDEFINED;
if (string.IsNullOrWhiteSpace(licenseString))
{
licStatus = LicenseStatus.CRACKED;
return(null);
}
var _licXML = string.Empty;
LicenseEntity _lic = null;
try
{
//Get RSA key from certificate
var cert = new X509Certificate2(certPubKeyData);
var rsaKey = (RSA)cert.PublicKey.Key;
var xmlDoc = new XmlDocument();
// Load an XML file into the XmlDocument object.
xmlDoc.PreserveWhitespace = true;
xmlDoc.LoadXml(Encoding.UTF8.GetString(Convert.FromBase64String(licenseString)));
// Verify the signature of the signed XML.
if (VerifyXml(xmlDoc, rsaKey))
{
var nodeList = xmlDoc.GetElementsByTagName("Signature");
xmlDoc.DocumentElement.RemoveChild(nodeList[0]);
_licXML = xmlDoc.OuterXml;
//Deserialize license
var _serializer = new XmlSerializer(typeof(LicenseEntity), new Type[] { licenseObjType });
using (var _reader = new StringReader(_licXML))
{
_lic = (LicenseEntity)_serializer.Deserialize(_reader);
}
licStatus = LicenseStatus.VALID;
licStatus = _lic.DoExtraValidation();
if (_lic.IsTimeTrial && DateTime.Now > _lic.ValidUntil.AddDays(1))
{
licStatus = LicenseStatus.TRIALEXPIRED;
}
}
else
{
licStatus = LicenseStatus.INVALID;
}
}
catch (Exception e)
{
licStatus = LicenseStatus.CRACKED;
}
return(_lic);
}
