Using java to encrypt integers

Question

I\'m trying to encrypt some integers in java using java.security and javax.crypto.

The problem seems to be that the Cipher class only encrypts byte arrays. I can\'t d

Answer 1

I have found the following code that may help you, since Integer in Java is always 4 bytes long.

public static byte[] intToFourBytes(int i, boolean bigEndian) {  
    if (bigEndian) {  
        byte[] data = new byte[4];  
        data[3] = (byte) (i & 0xFF);  
        data[2] = (byte) ((i >> 8) & 0xFF);  
        data[1] = (byte) ((i >> 16) & 0xFF);  
        data[0] = (byte) ((i >> 24) & 0xFF);  
        return data;  

    } else {  
        byte[] data = new byte[4];  
        data[0] = (byte) (i & 0xFF);  
        data[1] = (byte) ((i >> 8) & 0xFF);  
        data[2] = (byte) ((i >> 16) & 0xFF);  
        data[3] = (byte) ((i >> 24) & 0xFF);  
        return data;  
    }  
}  

You can find more information about the bigEndian parameter here: http://en.wikipedia.org/wiki/Endianness