I am googling and testing solution for a while and so far no success. There is always some problem with it. Following code is "working" (meaning do not show any error while it is running) on Android Kitkat and higher, but decrypted files are not readable. Why?
final static byte[] iv = new byte[16];//ADDED
final static int buffer = 102400;
final static String encryptionType = "AES/CFB8/NoPadding";//CHANGED TO DIFFERENT TYPE
static void encrypt(String password, File fileInput, File fileOutput) throws Exception {
IvParameterSpec ivParams = new IvParameterSpec(iv);//ADDED
FileInputStream fis = new FileInputStream(fileInput);
FileOutputStream fos = new FileOutputStream(fileOutput);
SecretKeySpec sks = new SecretKeySpec(password.getBytes("UTF-8"), encryptionType);
Cipher cipher = Cipher.getInstance(encryptionType);
//cipher.init(Cipher.ENCRYPT_MODE, sks);REPLACED
cipher.init(Cipher.ENCRYPT_MODE, sks, ivParams);
CipherOutputStream cos = new CipherOutputStream(fos, cipher);
int b;
byte[] d = new byte[buffer];
while ((b = fis.read(d)) != -1) {
cos.write(d, 0, b);
}
cos.flush();
cos.close();
fis.close();
}
static void decrypt(String password, File fileInput, File fileOutput) throws Exception {
IvParameterSpec ivParams = new IvParameterSpec(iv);//ADDED
FileInputStream fis = new FileInputStream(fileInput);
FileOutputStream fos = new FileOutputStream(fileOutput);
SecretKeySpec sks = new SecretKeySpec(password.getBytes("UTF-8"), encryptionType);
Cipher cipher = Cipher.getInstance(encryptionType);
//cipher.init(Cipher.ENCRYPT_MODE, sks);REPLACED
cipher.init(Cipher.DECRYPT_MODE, sks, ivParams);
CipherInputStream cis = new CipherInputStream(fis, cipher);
int b;
byte[] d = new byte[buffer];
while ((b = cis.read(d)) != -1) {
fos.write(d, 0, b);
}
fos.flush();
fos.close();
cis.close();
}
EDIT: After I changed type to "AES/CFB8/NoPadding", it seems to be ok, there is no error in process, but decrypted file is not readable.