AES encryption makes different result in iOS and Android

Question

Trying to encrypt sample data using AES128 algorithm with CBC and PKCS7 padding in Android and iOS, but results are different :(

Android code:

private s         


        

Answer 1

The Android code uses explicitly CBC mode. But the iOS code does not specify this. At least I don't see it there.

Also when you use CBC mode, you must also specify Initialization Vector:

byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; // use different random value
AlgorithmParameterSpec algorithmSpec = new IvParameterSpec(iv);
Cipher ecipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
ecipher.init(Cipher.ENCRYPT_MODE, skeySpec, algorithmSpec);

You should use the same initialization vector on iOS and also specify you are using CBC mode.