MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

public class MainClass {
    public static void main(String[] args) {
        if (args.length != 2) {
            String err = "Usage: KeyGeneratorApp algorithmName keySize";
            System.out.println(err);
            System.exit(0);
        }
        int keySize = (new Integer(args[1])).intValue();
        SecretKey skey = null;
        KeyPair keys = null;
        String algorithm = args[0];

        try {
            KeyPairGenerator kpg = KeyPairGenerator.getInstance(algorithm);
            kpg.initialize(keySize);
            keys = kpg.genKeyPair();
        } catch (NoSuchAlgorithmException ex1) {
            try {
                KeyGenerator kg = KeyGenerator.getInstance(algorithm);
                kg.init(keySize);
                skey = kg.generateKey();
            } catch (NoSuchAlgorithmException ex2) {
                System.out.println("Algorithm not supported: " + algorithm);
                System.exit(0);

            }
        }
    }
}