Simple custom encryption and decryption of Android files

In Android or other projects often download and upload files, in order to secure these files we and the server unified encryption key, you can encrypt and decrypt files.

Code:

/**
* File files are encrypted and decrypted
*
* @param FILEURL
* File path
* @param key
* Password
* @throws Exception
*/
public static Boolean Decryptorencrypt (String fileUrl) {
try {
File File = new file (FILEURL);
if (!file.exists ()) {
return false;
}
FileInputStream fileforinput = new FileInputStream (file);
byte[] bytes = new byte[fileforinput.available ()];
Fileforinput.read (bytes);
String stren = Commonconfig.decrypt_key;
int nkeylen = Stren.length ();
int nIndex = 0;
FileOutputStream out = new FileOutputStream (FILEURL);
for (int i = 0; i < bytes.length; i++) {
Bytes[i] = (byte) (Bytes[i] ^ stren.getbytes () [NIndex]);
nindex++;
if (NIndex >= nkeylen) {
NIndex = 0;
}
}
Out.write (bytes, 0, bytes.length);
Out.flush ();
Fileforinput.close ();
Out.close ();

} catch (Exception e) {
E.printstacktrace ();
return false;
}
return true;
}

Simple custom encryption and decryption of Android files