objective c - Decrypt with java and AES file encrypted in Obj-C -

i have file encrypted obj-c code:

nsmutabledata *filedata = [nsmutabledata new]; // file data. [[self encrypt::filedata withkey:@"some_key"]]  - (nsmutabledata*) encrypt:(nsmutabledata*)data withkey: (nsstring *) key {     // 'key' should 32 bytes aes256, null-padded otherwise     char keybuffer[kcckeysizeaes128+1]; // room terminator (unused)     bzero( keybuffer, sizeof(keybuffer) ); // fill zeroes (for padding)      [key getcstring: keybuffer maxlength: sizeof(keybuffer) encoding: nsutf8stringencoding];      // encrypts in-place, since mutable data object     size_t numbytesencrypted = 0;      size_t returnlength = ([data length] + kcckeysizeaes256) & ~(kcckeysizeaes256 - 1);      char* returnbuffer = malloc(returnlength * sizeof(uint8_t) );      cccryptorstatus result = cccrypt(kccencrypt, kccalgorithmaes128 , kccoptionpkcs7padding | kccoptionecbmode,                                  keybuffer, kcckeysizeaes128, nil,                                  [data bytes], [data length],                                  returnbuffer, returnlength,                                  &numbytesencrypted);      if(result == kccsuccess)         return [nsmutabledata datawithbytes:returnbuffer length:numbytesencrypted];     else         return nil; } 

i want read file java. trying

secretkeyfactory factory = secretkeyfactory.getinstance("pbkdf2withhmacsha1"); // salt ?? keyspec spec = new pbekeyspec("some_key", salt, 65536, 256); secretkey tmp = factory.generatesecret(spec); secretkey secret = new secretkeyspec(tmp.getencoded(), "aes"); cipher cipher = cipher.getinstance("aes/cbc/pkcs5padding"); cipher.init(cipher.decrypt_mode, secret, new ivparameterspec(iv)); string plaintext = new string(cipher.dofinal(ciphertext), "utf-8"); system.out.println(plaintext); 

i don't know obj-c. think done ? thank you.

use cipher.getinstance("aes/ecb/pkcs5padding"); since objective-c code using ecb instead of cbc (you ought use cbc or ctr instead of ecb, in case doesn't have choice)

also, use secretkey secret = new secretkeyspec("some_key".getbytes("utf-8"), "aes"); since objective-c code using raw bytes password generate key (rather using cryptographic key generator you're doing). "some_key" needs same password used objective-c code. in addition, "some_key".getbytes("utf-8") needs 16 bytes, if necessary need truncate 16 bytes or else pad 0's 16 bytes.