AES 256 encryption - Qt equivalent for Java

Question

I have my AES 256 encryption method implemented and working fine in Java as follows!

  private static final byte[] IV = {
    0, 2, 4, 8, 16, 32, 64, 127, 
          


        

Answer 1

Initialization vector is different in your Java code and Qt:

private static final byte[] IV = {
    0, 2, 4, 8, 16, 32, 64, 127, 
    127, 64, 32, 16, 8, 4, 2, 0
};

And in C++:

memset( iv, 0x00, AES::BLOCKSIZE ); // ==> This fills the iv array with 0s

So you need to use same IV for both schemes.

Update:

In order to provide an IV for CBC mode of AES, you need to specify IV as you do in Java:

byte iv[ AES::BLOCKSIZE ] = {0, 2, 4, 8, 16, 32, 64, 127, 
                             127, 64, 32, 16, 8, 4, 2, 0};

Note that AES::BLOCKSIZE is defined in library headers and it is 16.