Java Encryption using XTEA

Question

How would I encrypt a string using the XTEA scheme in Java.

Thanks

    public class run {
        public static void main(String[] args) throws Exception{

         XTEA2 x= new XTEA2("keykey");
         String s = "hi there";
         byte[] theBytes = s.getBytes();


         System.out.println("Plaintext: " + new String(theBytes));

         x.encrypt(theBytes); //theBytes now contains the encrypted data

         System.out.println("Crypo Text: " + new String(theBytes));


         x.decrypt(theBytes); //theBytes now contains the decrypted data

         System.out.println("Decrypted: " + new String(theBytes));
         String str = new String(theBytes); //decrypted String




        }
    }
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Works if it is padded properly. Thanks guys

Answer 1

This:

http://www.google.com/search?q=java+encryption+XTEA gave me this

http://en.wikipedia.org/wiki/XTEA which finally gave me this:

http://code.google.com/p/h2database/source/browse/trunk/h2/src/main/org/h2/security/XTEA.java

Which I think is what you want

EDIT

I don't know if you have read this already but here it goes.

Java security API provide the architecture needed for cryptography

You get a Cypher using Cipher.getInstace() method:

like

Cipher c = Cipher.getInstance("DES/CBC/PKCS5Padding");

But by default java do not provide a cipher for XTEA

However you are given the means to register your own .

I've never had the need to follow the complete process, I guess you have to fulfill a number of interfaces and register your implementation.

In case you need to go that far, you can use the implementation mentioned earlier. It is the one used by H2 DB.

I hope this helps.

Answer 2

After searching on google I found out that you can manually implement a XTEA scheme with using the BlockCipher interface.

H2 Database implemented a version with this interface which you can find here: XTEA.JAVA on code.google.com

The problem here is that you'll need to modify the encrypt/decrypt(byte[], byte[], int) methods to match your needs.

Answer 3

First, you need this method to convert the String to a byte array:

 public static byte[] convertStringToByteArray(String stringToConvert) {
    byte[] theByteArray = stringToConvert.getBytes();

    return theByteArray;
}

then, use this code from the db4o project, and call its methods like:

byte[] theBytes = convertStringToByteArray("the string");
encrypt(theBytes); //theBytes now contains the encrypted data

for encryption, and

decrypt(theBytes); //theBytes now contains the decrypted data
String str = new String(theBytes); //decrypted String