public static LicenseRequest FromOfflineData(string data)
{
using (var memoryStream = new MemoryStream(DataEncoder.FromHexString(data)))
{
using (var reader = new BinaryReader(memoryStream))
{
var header = reader.ReadByte();
var type = (RequestType)(header >> 7);
var cidLength = header ^ (byte)type << 7;
var request = new LicenseRequest(type)
{
ClientId = reader.ReadBytes(cidLength)
};
if (type == RequestType.Activate)
{
request.Certificate = reader.ReadBytes(reader.ReadUInt16());
if (memoryStream.Position < memoryStream.Length - 66 /*UInt32+SHA512*/)
{
var licenseLength = reader.ReadUInt16();
if (licenseLength > 0)
{
request.LicenseKey = reader.ReadBytes(licenseLength);
}
}
else
{
request.LicenseKey = new byte[0];
}
}
var dataEnd = memoryStream.Position;
var sign = reader.ReadBytes(64);
//Verify sign
memoryStream.Position = 0;
var databuffer = reader.ReadBytes((int)dataEnd);
var signBuffer = RSASigner.GetSignBuffer(databuffer, new[] { HashSecret.GetSecret() });
var signToValidate = SHA512.Create().ComputeHash(signBuffer);
if (sign.Where((t, i) => t != signToValidate[i]).Any())
{
throw new LicenseValidationException("Signatures doesn't match");
}
return(request);
}
}
}
public static LicenseResult FromOfflineString(string offlineString, Client client)
{
return(new LicenseResult(DataEncoder.FromHexString(offlineString), client));
}
