Node JS encryption code to Java encryption code

Question

I'm trying to find the similar java code for the below Node JS code,

Node JS Code:

     var crypto = require('crypto');

     var mykey = crypto.createCipher('aes-128-ecb', 'XXXXXXXX00000000');
     var mystr = mykey.update('HelloWorld', 'utf8', 'hex')
     mystr += mykey.final('hex');

      console.log(mystr);

Encryption Result: ce25d577457cf8113fa4d9eb16379529

Java Code:

 public static String toHex(String arg) throws UnsupportedEncodingException {
              return String.format("%x", new BigInteger(1, arg.getBytes("UTF-8")));
        }

 public static void main(String args[]) throws Exception{
 
    byte[] key = "XXXXXXXX".getBytes();
    String message = "HelloWorld";
        
    try {
        key = Arrays.copyOf(key, 16); 
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);         
        byte encstr[] = cipher.update(message.getBytes());
        String encData = new String(encstr, "UTF-8");
        encData = toHex(encData);
        byte encstr2[] = cipher.doFinal();
        String encData2 = new String(encstr2);
        encData  = encData + toHex(encData2);           
        System.out.println(encData);
    } catch (NoSuchAlgorithmException nsae) {
        throw new Exception("Invalid Java Version");
    } catch (NoSuchPaddingException nse) {
        throw new Exception("Invalid Key");
    }
    
}

Encryption Result: 056efbfbdefbfbd7c7760efbfbdefbfbdefbfbd39262cefbfbdefbfbd5166

Answer 1

Taking up the comments of @Robert and @Topaco I wrote a simple decryption program that is working for the given password 'XXXXXXXX00000000'.

Please keep in mind that this progrsm is using UNSECURE AES ECB mode and UNSECURE MD5 hash algorithm. The program does NOT provide any proper exception handling.

This is the result:

ciphertext Java:   ce25d577457cf8113fa4d9eb16379529
ciphertext NodeJS: ce25d577457cf8113fa4d9eb16379529

My code:

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MainSo {
    public static void main(String[] args) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        System.out.println("https://stackoverflow.com/questions/63263081/node-js-encryption-code-to-java-encryption-code");

        String plaintext = "HelloWorld";
        String keyString =  "XXXXXXXX00000000"; // 16 chars
        byte[] key = keyString.getBytes(StandardCharsets.UTF_8);
        // md5 hashing is unsecure !!
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] keyMd5 = md.digest(key);
        // aes ecb mode encryption is unsecure
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        SecretKeySpec secretKeySpec = new SecretKeySpec(keyMd5, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
        byte[] ciphertext = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));
        System.out.println("ciphertext Java:   " + bytesToHex(ciphertext));
        System.out.println("ciphertext NodeJS: " + "ce25d577457cf8113fa4d9eb16379529");
    }
    private static String bytesToHex(byte[] bytes) {
        // service method for displaying a byte array as hex string
        StringBuffer result = new StringBuffer();
        for (byte b : bytes) result.append(Integer.toString((b & 0xff) + 0x100, 16).substring(1));
        return result.toString();
    }
}