Cannot decrypt encrypted file in android lollipop

Question

I have an encrypt/decrypt mechanism for downloaded files in my app.

This mechanism works in all android devices and versions prior to android 5.0-lollipop.

Here is decryption process:

cipher.init(Cipher.DECRYPT_MODE, key);
fileInputStream = new FileInputStream(file);
cipherInputStream = new CipherInputStream(fileInputStream, cipher);
byte[] fileByte = new byte[(int) file.length()];
int j = cipherInputStream.read(fileByte);
return fileByte;

cipher and key were generated before and are used in whole app:

 key = new SecretKeySpec(keyValue, "AES");
 try {
     cipher = Cipher.getInstance("AES");
 } catch (Exception e) {
     e.printStackTrace();
 }

When I decrypt a file with about 200,000 bytes in android 5.0, j (variable before return) is about 8000 which is much lower than 200000, while in older android versions it is exactly equal to decrypted file length.

I found that the problem is in decryption. Because I can encrypt a file in android 5.0 and decrypt it in older android versions, but not vice versa. However I am posting encryption process:

cipher.init(Cipher.ENCRYPT_MODE, AESutil.key);
cipherOutputStream = new CipherOutputStream(output, cipher);
byte data[] = new byte[1024];
int count;
while ((count = input.read(data)) != -1) {
    cipherOutputStream.write(data, 0, count);
}

Thanks in advance

Answer 1

My Cipher example (L) :

APPPATH is String to my aplication directory on sd card

static void encrypt(File file, String pass) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {


        FileInputStream fis = new FileInputStream(file);


        FileOutputStream fos = new FileOutputStream(APPPATH+"/E_"+file.getName());


        SecretKeySpec sks = new SecretKeySpec(pass.getBytes(), "AES");

        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, sks);

        CipherOutputStream cos = new CipherOutputStream(fos, cipher);

        int b;
        byte[] d = new byte[8];
        while((b = fis.read(d)) != -1) {
            cos.write(d, 0, b);
        }

        cos.flush();
        cos.close();
        fis.close();


    }



     static void decrypt(File file, String pass) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {

            FileInputStream fis = new FileInputStream(file);

            FileOutputStream fos = new FileOutputStream(APPPATH+"/D_"+file.getName());
            SecretKeySpec sks = new SecretKeySpec(pass.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, sks);
            CipherInputStream cis = new CipherInputStream(fis, cipher);
            int b;
            byte[] d = new byte[8];
            while((b = cis.read(d)) != -1) {
                fos.write(d, 0, b);
            }
            fos.flush();
            fos.close();
            cis.close();
        }