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The casts to RSACryptoProvider in the LicenseHandler need to be adjusted for .NET 4.6 and later. In .NET 4.7.2, these break completely due to the deprecation of SHA1 and the cast defaults to this busted algorithm so the code aborts

The fix appears to be to change the private/public key lines of the form:

RSACryptoServiceProvider rsaKey = (RSACryptoServiceProvider)cert.PublicKey.Key;

to :

RSA rsaKey = cert.getRSAPublicKey();

Hi,

How to fix this error on LicenseHandler.cs Line 141 signedXml.ComputeSignature();

System.Security.Cryptography.CryptographicException
HResult=0x80090008
Message=Invalid algorithm specified.

Thanks

Where can I set the creation time? For me it is always 1.1.0001 for some reason...

Hi

I created a PFK and CER file and copied both into the demo project.

I adjusted the password.

I also set the target framework to 4.7.2 but it will not compile:

Severity	Code	Description	Project	File	Line	Suppression State
Error	CS0246	The type or namespace name 'QLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoActivationTool	D:\My Programs\2022\QLicense-master\Demo\DemoActivationTool\frmMain.cs	6	Active
Error	CS0246	The type or namespace name 'DemoLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoActivationTool	D:\My Programs\2022\QLicense-master\Demo\DemoActivationTool\frmMain.cs	7	Active
Error	CS0246	The type or namespace name 'QLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoActivationTool	D:\My Programs\2022\QLicense-master\Demo\DemoActivationTool\frmMain.cs	50	Active
Error	CS0246	The type or namespace name 'QLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoActivationTool	D:\My Programs\2022\QLicense-master\Demo\DemoActivationTool\frmMain.Designer.cs	91	Active
Error	CS0246	The type or namespace name 'QLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoActivationTool	D:\My Programs\2022\QLicense-master\Demo\DemoActivationTool\frmMain.Designer.cs	93	Active
Error	CS0246	The type or namespace name 'QLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoWinFormApp	D:\My Programs\2022\QLicense-master\Demo\DemoWinFormApp\frmActivation.Designer.cs	83	Active
Error	CS0246	The type or namespace name 'QLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoWinFormApp	D:\My Programs\2022\QLicense-master\Demo\DemoWinFormApp\frmMain.cs	5	Active
Error	CS0246	The type or namespace name 'DemoLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoWinFormApp	D:\My Programs\2022\QLicense-master\Demo\DemoWinFormApp\frmMain.cs	6	Active
Error	CS0246	The type or namespace name 'QLicense' could not be found (are you missing a using directive or an assembly reference?)	DemoWinFormApp	D:\My Programs\2022\QLicense-master\Demo\DemoWinFormApp\frmMain.Designer.cs	58	Active

Yet, I can see it there.

Please.

Thanks.

I want to set 30 days trial using this how to manage the time period using Qlicense Library?

How to get and create LicenseSign.pfx file. I'm not found licenseSign.pfx file under demo folder.

Great job.
Now I am able to introduce license into my sw and also features specific license for different customers type.
The only doubt is what is the Volume license.
How I can control what computers can run a sw?
There is something that I have not understood on this license type.
Anyway thank you

If you are trying to add this to a DLL which is run by a CAD application, you need to change the way you find the path to the license file:

System.Reflection.Module mod = GetType().Module;
string pathlic = Path.Combine(Path.GetDirectoryName(mod.FullyQualifiedName), "license.lic");

additional embeded res or not a lot of metter;
same like use in mem in demo;
but nice starting point

Saw this on code project, but this repo doesn't have a license file. Is this also to be CPOL?

Hello soldierq，
when i check out your code ,i found the LicenseSign.pfx file can't find when i build the project?
Can you help to fix that?Thanks a lot.

the sample demo works, but when i try to apply it on my proj
it got an error, Object reference not set to an instance of an object.

//Read public key from assembly

        Assembly _assembly = Assembly.GetExecutingAssembly();
        using (MemoryStream _mem = new MemoryStream())
        {
           
           // this line got an error
          _assembly.GetManifestResourceStream("Form1.LicenseVerify.cer").CopyTo(_mem);

            _certPubicKeyData = _mem.ToArray();
        }

can you help on this? I've recently download the update version from your article on codeproject, before your update, i got this form working, but it got some issues after

I notice this is empty and yet it part of the GenerateUID function call.

tested on Win10 works fine.
But when ran on win7, it was always failed.
I tracked the problem was :

// Check the signature and return the result.
return signedXml.CheckSignature(Key);

Always false on Win7

for example:
qlicense.snk file

Hello, the project looks pretty interesting to me. Are there any experiences or maybe known issues using QLicense in an .NET Standard (2.0) library?
Best regards, adrian

hOW CAN I CREATE / GET DemoActivationTool.LicenseSign.pfx FILE?

Hi,
I built the project with no errors also had LicenseSign.pfx in DemoActivationTool folder. When trying to generate the license having the following error "System.Security.Cryptography.CryptographicException: 'The specified network password is not correct".
Do I have to do any modifications to the certificate?

Thanks in advance!