This example demonstrate encrypting an object using DES algorithm. After the object was encrypted we store it in a file which will be decrypted in the next example here How do I decrypt an object with DES.
package org.kodejava.crypto;
import java.io.*;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SealedObject;
import javax.crypto.SecretKey;
public class ObjectEncrypt {
public static void main(String[] args) throws Exception {
// Generating a temporary key and store it in a file.
SecretKey key = KeyGenerator.getInstance("DES").generateKey();
writeToFile("secretkey.dat", key);
// Preparing Cipher object for encryption.
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
// Here we seal (encrypt) a simple string message (a string object).
SealedObject sealedObject = new SealedObject("THIS IS A SECRET MESSAGE!", cipher);
// Write the object out as a binary file.
writeToFile("sealed.dat", sealedObject);
}
// Store object in a file for future use.
private static void writeToFile(String filename, Object object) throws Exception {
try (FileOutputStream fos = new FileOutputStream(filename);
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
oos.writeObject(object);
}
}
}
Latest posts by Wayan (see all)
- How do I handle cookies using Jakarta Servlet API? - April 19, 2025
- How do I set response headers with HttpServletResponse? - April 18, 2025
- How do I apply gain and balance using FloatControl? - April 18, 2025