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

You can turn ints into a byte[] using a DataOutputStream, like this:

ByteArrayOutputStream baos = new ByteArrayOutputStream ();
DataOutputStream dos = new DataOutputStream (baos);
dos.writeInt (i);
byte[] data = baos.toByteArray();
// do encryption

Then to decrypt it later:

byte[] decrypted = decrypt (data);
ByteArrayInputStream bais = new ByteArrayInputStream (data);
DataInputStream dis = new DataInputStream (bais);
int j = dis.readInt();