Question

I’m trying to encrypt some text using AES on .net and have it read on Java.

The sample code I got for the encryption looks like this:

byte[] key = ...
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");

How does Java get the key and the IV from the SecretKey object? I need to provide them for .net and have found no information on it.

Answer 1

You may provide the IV to the cipher in Java using an instance of IvParameterSpec passed to Cipher.init. If you don’t, a random IV will be generated and made available by the getIV method of Cipher.