import java.net.*;
import java.util.Arrays;
import javax.crypto.*;
+import javax.crypto.spec.*;
+import java.security.SecureRandom;
class CloudComm {
String baseurl;
Cipher encryptcipher;
Cipher decryptcipher;
Mac mac;
+ byte[] salt;
+ SecretKeySpec key;
+ static final int SALT_SIZE = 8;
- CloudComm(String _baseurl, Cipher _encrypt, Cipher _decrypt, Mac _mac) {
+
+ CloudComm() {
+ }
+
+ CloudComm(String _baseurl, String password) {
this.baseurl=_baseurl;
- this.encryptcipher = _encrypt;
- this.decryptcipher = _decrypt;
- this.mac = _mac;
+ initCloud(password);
}
+ private void initKey(String password) {
+ try {
+ salt=new byte[SALT_SIZE];
+ PBEKeySpec keyspec = new PBEKeySpec(password.toCharArray(), salt, 65536, 128);
+ SecretKey tmpkey = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256").generateSecret(keyspec);
+ this.key = new SecretKeySpec(tmpkey.getEncoded(), "AES");
+ } catch (Exception e) {
+ e.printStackTrace();
+ throw new Error("Failed generating key.");
+ }
+ }
+
+ private void initCloud(String password) {
+ try {
+ initKey(password);
+ mac = Mac.getInstance("HmacSHA256");
+ mac.init(key);
+ } catch (Exception e) {
+ e.printStackTrace();
+ throw new Error("Failed To Initialize Ciphers");
+ }
+ }
+
private URL buildRequest(boolean isput, long sequencenumber, long maxentries) throws IOException {
String reqstring=isput?"req=putslot":"req=getslot";
String urlstr=baseurl+"?"+reqstring+"&seq="+sequencenumber;
return new URL(urlstr);
}
- public Slot[] putSlot(Slot slot, int max) throws IOException {
+ public Slot[] putSlot(Slot slot, int max) {
try {
long sequencenumber=slot.getSequenceNumber();
byte[] bytes=slot.encode(mac);
}
}
+ /*
+ Cipher encryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
+ encryptCipher.init(Cipher.ENCRYPT_MODE, secret);
+ Cipher decryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
+ decryptCipher.init(Cipher.DECRYPT_MODE, secret);
+ */
+
public Slot[] getSlots(long sequencenumber) {
try {
URL url=buildRequest(false, sequencenumber, 0);