Encryption using AES-128 in Android and IPhone (Different result)

Question

I am trying to encrypt some text using the AES algorithm on both the Android and IPhone platforms. My problem is, even using the same encryption/decryption algorithm (AES-12

Answer 1

It makes me no wonder that you get different results.

Your problem is that you use misuse a SHA1PRNG for key derivation. AFAIK there is no common standard how a SHA1PRNG work internally. AFAIR even the J2SE and Bouncycaste implementation output different results using the same seed.

Hence your implementation of your getRawKey(byte[] seed) will generate you a random key. If you use the key for encryption you are getting an result that depends on that key. As the key is random you will not get the same key on iOS and therefore you are getting a different result.

If you want a key derivation function use a function like PBKDF2 with is nearly fully standardized regarding the key derivation.