Decrypting Java AES Encryption in Objective-C -

this question might've asked several times, have yet discover answer solved problem.

scenario: have encrypted file server, using java. goal decrypt file in iphone (objective-c).

i tried decrypt using fbencryptoraes no avail.

here's decryption in objective-c:

nsdata *returndata = [fbencryptoraes decryptdata:stream key:key iv:nil]; 

the stream encrypted nsdata obtained server, key aes.

i have written equivalent java code, , decrypt data correctly using , therefore verify key i'm using identical byte-per-byte. here's said java code:

secretkeyspec key = new secretkeyspec(key, "aes"); cipher cipher = cipher.getinstance("aes"); cipher.init(cipher.decrypt_mode, key); cipherin = new cipherinputstream(new fileinputstream(<decrypted-file>, cipher); 

any suggestion?

thanks.