Is there any sample Java code that does AES encryption exactly like this website?

Question

http://www.hanewin.net/encrypt/aes/aes-test.htm

If you go to this website and enter the following:

\"Key In Hex\":        000000000000000000000000001         


        

Answer 1

See the code below for the standard way to do this with JCE classes.

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;

public class EncryptionExample {

  public static void main(String[] args) throws Exception {
    final String keyHex = "00000000000000000000000000123456";
    final String plaintextHex = "00000000000000000000000000000000";

    SecretKey key = new SecretKeySpec(DatatypeConverter
        .parseHexBinary(keyHex), "AES");

    Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
    cipher.init(Cipher.ENCRYPT_MODE, key);

    byte[] result = cipher.doFinal(DatatypeConverter
        .parseHexBinary(plaintextHex));

    System.out.println(DatatypeConverter.printHexBinary(result));
  }
}

Prints:

3FA9F2A6E4C2B440FB6F676076A8BA04

Answer 2

instead of converting bytes to HEX, you may convert to Base64 as well. I like using Apache Commons for this. Here is an example.

To compile you need additional Apache Commons Codec jar, which is available here:

http://commons.apache.org/proper/commons-codec/download_codec.cgi

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class Encryptor {
    public static String encrypt(String key1, String key2, String value) {
        try {
            IvParameterSpec iv = new IvParameterSpec(key2.getBytes("UTF-8"));

            SecretKeySpec skeySpec = new SecretKeySpec(key1.getBytes("UTF-8"),
                    "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(value.getBytes());
            System.out.println("encrypted string:"
                    + Base64.encodeBase64String(encrypted));
            return Base64.encodeBase64String(encrypted);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    public static String decrypt(String key1, String key2, String encrypted) {
        try {
            IvParameterSpec iv = new IvParameterSpec(key2.getBytes("UTF-8"));

            SecretKeySpec skeySpec = new SecretKeySpec(key1.getBytes("UTF-8"),
                    "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));

            return new String(original);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {

        String key1 = "Bar12345Bar12345"; // 128 bit key
        String key2 = "ThisIsASecretKet";
        System.out.println(decrypt(key1, key2,
                encrypt(key1, key2, "Hello World")));
    }
}