The Java™ Tutorials
Hide TOC
Prepare Initial Program Structure
Trail: Security Features in Java SE
Lesson: Generating and Verifying Signatures
Section: Generating a Digital Signature

Prepare Initial Program Structure

Here's the basic structure of the GenSig program. Place it in a file called


class GenSig {

    public static void main(String[] args) {

        /* Generate a DSA signature */

        if (args.length != 1) {
            System.out.println("Usage: GenSig nameOfFileToSign");
        else try {

        // the rest of the code goes here

        } catch (Exception e) {
            System.err.println("Caught exception " + e.toString());


Previous page: Generating a Digital Signature
Next page: Generate Public and Private Keys