send.java

wendang for java. 124342423 432

package javasec.samples.ch13;

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class Send {
    public static void main(String args[]) {
        try {
            KeyGenerator kg = KeyGenerator.getInstance("DES");
            kg.init(new SecureRandom());
            SecretKey key = kg.generateKey();
            SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
            Class spec = Class.forName("javax.crypto.spec.DESKeySpec");
            DESKeySpec ks = (DESKeySpec) skf.getKeySpec(key, spec);
            ObjectOutputStream oos = new ObjectOutputStream(
                        new FileOutputStream("keyfile"));
            oos.writeObject(ks.getKey());

            Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");
            c.init(Cipher.ENCRYPT_MODE, key);
            CipherOutputStream cos = new CipherOutputStream(
                        new FileOutputStream("ciphertext"), c);
            PrintWriter pw = new PrintWriter(
                        new OutputStreamWriter(cos));
            pw.println("Stand and unfold yourself");
            pw.close();
            oos.writeObject(c.getIV());
            oos.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}