How can i decrypt the xml file in iOS with AES/CBC/PKCS5Padding standard,in android the file has been decrypted ,all keys like salt, IV

Question

      private static Cipher getCipher(int mode) throws Exception {
      Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");

      //a random Init. Vector. just for testing
      byte[] iv = "e675f725e675f725".getBytes("UTF-8");

      c.init(mode, generateKey(), new IvParameterSpec(iv));
      return c;
  }


  private static String Decrypt(String encrypted) throws Exception {

      byte[] decodedValue = new Base64().decode(encrypted.getBytes("UTF-8")); // new BASE64Decoder().decodeBuffer(encrypted);

      Cipher c = getCipher(Cipher.DECRYPT_MODE);
      byte[] decValue = c.doFinal(decodedValue);

      return new String(decValue);
  }

  private static Key generateKey() throws Exception {
      SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
      char[] password = "3x5FBNs!".toCharArray();
      byte[] salt = "S@1tS@1t".getBytes("UTF-8");

      KeySpec spec = new PBEKeySpec(password, salt, 65536, 128);
      SecretKey tmp = factory.generateSecret(spec);
      byte[] encoded = tmp.getEncoded();
      return new SecretKeySpec(encoded, "AES");
  }

I tried to use RNCryptor but could not decrypt. Can anybody help me which library should i use because i have got the encrypted file and don't know how it has been encrypted.

Answer 1

In order to use RNCryptor it is best to use it on both platforms.

From a previous question it seems that the encrypted data was bytes, not Base64 encoded.

The primitives supplied by Apple Common Crypto and are part of the Security.framework. The header to use is #import <CommonCrypto/CommonCrypto.h> and you will find the interfaces you need in CommonCryptor.h and CommonKeyDerivation.h.

Make an attempt for iOS and add the code along with hex dumps of all input and output parameters and data both for the Android and iOS code.