docs: private byte[] computeJ0(byte[] nonce) {
           final int blockSize = getBlockSizeInBytes();
           byte[] J0 = new byte[blockSize];
           System.arraycopy(nonce, 0, J0, 0, nonce.length);
           J0[blockSize - 1] = 0x01;
           return incrementBlocks(J0, 1);
       }