Tag: java

Floating licenses in Java

February 4, 2019

Floating licenses makes it easier for your customers to switch between machines that actively run your software, without having to deactivate them first. For instance, you can constrain the number of concurrent users to 10, but still allow the software to be installed on eg. 100 computers.

In Cryptolens, floating licensing works by letting your app to regularly poll the server to check if the number of concurrent users has been exceeded, which can be accomplished with the code snippet below:

import io.cryptolens.methods.*;
import io.cryptolens.models.*;

public static void main(String args[]) {
    String RSAPubKey = "RSA Public Key";
    String auth = "Access token";

    LicenseKey license = Key.Activate(auth, RSAPubKey, new ActivateModel(3349, "MTMPW-VZERP-JZVNZ-SCPZM", Helpers.GetMachineCode(), 300, 1));
    if (license == null || !Helpers.IsOnRightMachine(license, true, true)) {
        System.out.println("The license does not work.");
    } else {
        System.out.println("The license is valid!");
        System.out.println("It will expire: " + license.Expires);
    }
}

Normally, if the app stops polling the server, that user will be automatically deactivated within the specified period of time. However, if you want to deactivate it instantly, you can use the code below:

import io.cryptolens.methods.*;
import io.cryptolens.models.*;

public static void main(String args[]) {
    String auth = "";

    boolean result = Key.Deactivate(auth, new DeactivateModel(3349, "MTMPW-VZERP-JZVNZ-SCPZM", Helpers.GetMachineCode(), true));
    if (result == true) {
        System.out.println("Deactivation successful.");
    } else {
        System.out.println("Deactivation failed.");
    }
}

To see all the required parameters, please check out the GitHub repo of the Java client. Should you have any questions, please feel free to reach out.

Protect Java code with software licensing

January 28, 2019

Today, we have released an update to the Java client API that allows you to easily verify license keys. You can read more about how to add it to your project in the GitHub repo. Below is an example of the code that you can use in your application.

import io.cryptolens.Cryptolens;
import io.cryptolens.Helpers;
import io.cryptolens.LicenseKey;

public class Main {

    public static void main(String[] args) {
        String RSAPubKey = "<RSAKeyValue><Modulus>sGbvxwdlDbqFXOMlVUnAF5ew0t0WpPW7rFpI5jHQOFkht/326dvh7t74RYeMpjy357NljouhpTLA3a6idnn4j6c3jmPWBkjZndGsPL4Bqm+fwE48nKpGPjkj4q/yzT4tHXBTyvaBjA8bVoCTnu+LiC4XEaLZRThGzIn5KQXKCigg6tQRy0GXE13XYFVz/x1mjFbT9/7dS8p85n8BuwlY5JvuBIQkKhuCNFfrUxBWyu87CFnXWjIupCD2VO/GbxaCvzrRjLZjAngLCMtZbYBALksqGPgTUN7ZM24XbPWyLtKPaXF2i4XRR9u6eTj5BfnLbKAU5PIVfjIS+vNYYogteQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

        Cryptolens cryptolens = Cryptolens.getDefault();
        cryptolens.setRSAPublicKey(RSAPubKey);

        Cryptolens.ActivateResponse response =
                cryptolens.activate( "WyIyNTk1IiwidVVrQm94OGlYS3pHZlhTc0x6Rm9mN1piektrT0FSd0REaFZ0ZXZJMSJd"
                        , 3349
                        , "ICVLD-VVSZR-ZTICT-YKGXL"
                        , Helpers.GetMachineCode()
                );

        if (!response.successful()) {
            System.out.println("Failed to activate!");
            Cryptolens.ActivateServerError er = response.getServerError();
            Exception ex = response.getException();

            if (er != null) {
                System.out.println("Server error: " + er);
            }

            if (ex != null) {
                ex.printStackTrace(System.out);
            }

            return;
        }

        LicenseKey licenseKey = response.getLicenseKey();

        System.out.println("Activation was successful!");
        System.out.println(licenseKey.getKey());
        System.out.println(licenseKey.getF1());
    }
}