LTAP Token Generator

LtpaTokenGenerator.java

import java.io.FileInputStream;
import java.util.Properties;
import javax.security.auth.Subject;
import java.security.Principal;

import com.ibm.websphere.security.ltpa.LTPAToken2;
import com.ibm.websphere.security.ltpa.LTPATokenFactory;

public class LtpaTokenGenerator {

    public static void main(String[] args) throws Exception {

        if (args.length < 4) {
            System.err.println(
                "Usage: java LtpaTokenGenerator <ltpa.keys> <password> <username> <realm>"
            );
            System.exit(1);
        }

        String keyPath = args[0];
        String password = args[1];
        String username = args[2];
        String realm = args[3];

        // Load ltpa.keys
        Properties ltpaProps = new Properties();
        try (FileInputStream fis = new FileInputStream(keyPath)) {
            ltpaProps.load(fis);
        }

        // Create Subject
        Subject subject = new Subject();
        subject.getPrincipals().add(new SimplePrincipal(username));

        // Get LTPA factory
        LTPATokenFactory factory = LTPATokenFactory.getInstance();

        // Generate LTPA2 token
        LTPAToken2 token = factory.createLTPAToken2(
                subject,
                realm,
                ltpaProps,
                password
        );

        if (token == null) {
            throw new RuntimeException("Token generation failed");
        }

        System.out.println("LtpaToken2=" + token.getEncodedToken());
    }

    // Minimal Principal implementation
    static class SimplePrincipal implements Principal {
        private final String name;
        SimplePrincipal(String name) { this.name = name; }
        public String getName() { return name; }
    }
}