AES Key generator : Advanced Encryption Standard « Security « Java Tutorial

1. Java Tutorial
2. Security
3. Advanced Encryption Standard

import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

public class MainClass {

  public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
    generator.init(128);

    Key keyToBeWrapped = generator.generateKey();

    System.out.println("input    : " + new String(keyToBeWrapped.getEncoded()));
    Cipher cipher = Cipher.getInstance("AESWrap", "BC");

    KeyGenerator KeyGen = KeyGenerator.getInstance("AES", "BC");
    KeyGen.init(256);

    Key wrapKey = KeyGen.generateKey();
    cipher.init(Cipher.WRAP_MODE, wrapKey);
    byte[] wrappedKey = cipher.wrap(keyToBeWrapped);

    System.out.println("wrapped : " + new String(wrappedKey));

    cipher.init(Cipher.UNWRAP_MODE, wrapKey);
    Key key = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);
    System.out.println("unwrapped: " + new String(key.getEncoded()));
  }
}