public boolean download(
      String sourceFile, String destFile, UserToken token, HashMap<String, ArrayList<Key>> keys) {
    try {
      destFile = "." + destFile;

      if (sourceFile.charAt(0) == '/') {
        sourceFile = sourceFile.substring(1);
      }

      File file = new File(destFile);

      if (!file.exists()) {
        file.createNewFile();

        FileOutputStream fos = new FileOutputStream(file);
        Envelope env = new Envelope("DOWNLOADF"); // Success
        env.addObject(sourceFile);
        env.addObject(token);
        String concat =
            sourceFile
                + token.toString()
                + "DOWNLOADF"
                + nonce; // concatinates all of the objects in envelope
        byte[] hasharray = concat.getBytes(); // turn the concat into a byte array
        Mac mac = Mac.getInstance("HmacSHA1");
        mac.init(HMACkey);
        mac.update(hasharray);
        String stringhash =
            new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
        env.addObject(stringhash);
        env.addObject(nonce);
        nonce++;

        byte[] envBytes = Envelope.toByteArray(env);

        // Encrypt envelope w/ AES
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, AESkey);
        byte[] cipherBytes = cipher.doFinal(envBytes);

        output.writeObject(cipherBytes); // here in download

        byte[] responseCipherBytes = (byte[]) input.readObject();

        // Decrypt response
        cipher.init(Cipher.DECRYPT_MODE, AESkey);
        byte[] responseBytes = cipher.doFinal(responseCipherBytes);

        env = Envelope.getEnvelopefromBytes(responseBytes);
        ShareFile sf = (ShareFile) env.getObjContents().get(2);
        int keyNum = sf.getKeyNum();
        ArrayList<Key> groupKeys = keys.get(sf.getGroup());
        Key key = groupKeys.get(keyNum);
        byte[] initialVector = sf.getIV();
        IvParameterSpec ivs = new IvParameterSpec(initialVector);
        byte[] decryptBuf = new byte[1024];

        while (env.getMessage().compareTo("CHUNK") == 0
            && (Integer) env.getObjContents().get(4) == nonce) {
          String hash = (String) env.getObjContents().get(3);
          concat =
              (Integer) env.getObjContents().get(1)
                  + env.getMessage()
                  + nonce; // reconstructs the hash
          System.out.println("Concat:" + concat);
          hasharray = concat.getBytes();
          mac = Mac.getInstance("HmacSHA1");
          File HASHfile = new File("FHASHKey.bin");
          FileInputStream fis = new FileInputStream(HASHfile);
          ObjectInputStream ois = new ObjectInputStream(fis);
          HMACkey = (Key) ois.readObject();
          mac.init(HMACkey);
          mac.update(hasharray);
          String newhash = new String(mac.doFinal(), "UTF8");
          nonce++;

          // check hashes for equality
          if (hash.equals(newhash) != true) {
            System.out.println("HASH EQUALITY FAIL1");
            disconnect();
            return false;
          } else {
            decryptBuf = new byte[1024];
            System.out.println("env.getMessage: " + env.getMessage());
            cipher = Cipher.getInstance("AES/CBC/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, key, ivs);
            decryptBuf = cipher.doFinal((byte[]) env.getObjContents().get(0));

            // Write encrypted file to disk
            fos.write(decryptBuf);
            System.out.printf(".");
            env = new Envelope("DOWNLOADF"); // Success
            concat = env.getMessage() + nonce; // concatinates all of the objects in envelope
            hasharray = concat.getBytes(); // turn the concat into a byte array
            mac = Mac.getInstance("HmacSHA1");
            mac.init(HMACkey);
            mac.update(hasharray);
            stringhash =
                new String(
                    mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
            env.addObject(stringhash);
            env.addObject(nonce);
            nonce++;

            envBytes = Envelope.toByteArray(env);

            // Encrypt envelope w/ AES
            cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, AESkey);
            cipherBytes = cipher.doFinal(envBytes);

            output.writeObject(cipherBytes);

            responseCipherBytes = (byte[]) input.readObject();

            // Decrypt response
            cipher.init(Cipher.DECRYPT_MODE, AESkey);
            responseBytes = cipher.doFinal(responseCipherBytes);

            env = Envelope.getEnvelopefromBytes(responseBytes);
          }
        }
        fos.close();
        if (env.getMessage().compareTo("EOF") == 0
            && (Integer) env.getObjContents().get(1) == nonce) {
          String hash = (String) env.getObjContents().get(0);
          concat = env.getMessage() + nonce; // reconstructs the hash
          hasharray = concat.getBytes();
          mac = Mac.getInstance("HmacSHA1");
          File HASHfile = new File("FHASHKey.bin");
          FileInputStream fis = new FileInputStream(HASHfile);
          ObjectInputStream ois = new ObjectInputStream(fis);
          HMACkey = (Key) ois.readObject();
          mac.init(HMACkey);
          mac.update(hasharray);
          String newhash = new String(mac.doFinal(), "UTF8");

          if (hash.equals(newhash) != true) // check hashes for equality
          {
            System.out.println("HASH EQUALITY FAIL2");
            disconnect();
          }

          fos.close();
          System.out.printf("\nTransfer successful file %s\n", sourceFile);
          nonce++;
          env = new Envelope("OK"); // Success
          concat = env.getMessage() + nonce; // concatinates all of the objects in envelope
          hasharray = concat.getBytes(); // turn the concat into a byte array
          mac = Mac.getInstance("HmacSHA1");
          mac.init(HMACkey);
          mac.update(hasharray);
          stringhash =
              new String(
                  mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
          env.addObject(stringhash);
          env.addObject(nonce);
          nonce++;

          envBytes = Envelope.toByteArray(env);

          // Encrypt envelope w/ AES
          cipher = Cipher.getInstance("AES");
          cipher.init(Cipher.ENCRYPT_MODE, AESkey);
          cipherBytes = cipher.doFinal(envBytes);

          output.writeObject(cipherBytes);

        } else if ((Integer) env.getObjContents().get(1) != nonce) {
          System.out.println("Nonce FAIL DOWNLOADF");
          disconnect();
          return false;
        } else {
          System.out.printf("Error reading file %s (%s)\n", sourceFile, env.getMessage());
          file.delete();
          return false;
        }
      } else {
        System.out.printf("Error couldn't create file %s\n", destFile);
        return false;
      }

    } catch (InvalidAlgorithmParameterException ex) {
      Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalBlockSizeException ex) {
      Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
      System.out.println(1);
    } catch (BadPaddingException ex) {
      Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
      System.out.println(2);
    } catch (InvalidKeyException ex) {
      Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
      System.out.println(3);
    } catch (NoSuchAlgorithmException ex) {
      Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
      System.out.println(4);
    } catch (NoSuchPaddingException ex) {
      Logger.getLogger(FileClient.class.getName()).log(Level.SEVERE, null, ex);
      System.out.println(5);
    } catch (IOException e1) {

      System.out.printf("Error couldn't create file %s\n", destFile);
      return false;

    } catch (ClassNotFoundException e1) {
      e1.printStackTrace(System.err);
    }
    return true;
  }
  public boolean delete(String filename, UserToken token) {
    try {
      String remotePath;
      if (filename.charAt(0) == '/') {
        remotePath = filename.substring(1);
      } else {
        remotePath = filename;
      }
      Envelope env = new Envelope("DELETEF"); // Success
      env.addObject(remotePath);
      env.addObject(token);
      String concat =
          remotePath
              + token.toString()
              + "DELETEF"
              + nonce; // concatinates all of the objects in envelope
      byte[] hasharray = concat.getBytes(); // turn the concat into a byte array
      Mac mac = Mac.getInstance("HmacSHA1");
      mac.init(HMACkey);
      mac.update(hasharray);
      String stringhash =
          new String(mac.doFinal(), "UTF8"); // turn the hash into a string for easy comparision!
      env.addObject(stringhash);
      env.addObject(nonce);
      nonce++;

      byte[] envBytes = Envelope.toByteArray(env);

      // Encrypt envelope w/ AES
      Cipher cipher = Cipher.getInstance("AES");
      cipher.init(Cipher.ENCRYPT_MODE, AESkey);
      byte[] cipherBytes = cipher.doFinal(envBytes);

      output.writeObject(cipherBytes);

      byte[] responseCipherBytes = (byte[]) input.readObject();

      // Decrypt response
      cipher.init(Cipher.DECRYPT_MODE, AESkey);
      byte[] responseBytes = cipher.doFinal(responseCipherBytes);

      env = Envelope.getEnvelopefromBytes(responseBytes);
      System.out.println(env.getMessage());
      if ((Integer) env.getObjContents().get(1) == nonce) {
        String hash = (String) env.getObjContents().get(0);
        concat = env.getMessage() + nonce; // reconstructs the hash
        hasharray = concat.getBytes();
        mac = Mac.getInstance("HmacSHA1");
        File HASHfile = new File("FHASHKey.bin");
        FileInputStream fis = new FileInputStream(HASHfile);
        ObjectInputStream ois = new ObjectInputStream(fis);
        Key HMACkey = (Key) ois.readObject();
        mac.init(HMACkey);
        mac.update(hasharray);
        String newhash = new String(mac.doFinal(), "UTF8");
        nonce++;

        if (hash.equals(newhash) != true) // check hashes for equality
        {
          System.out.println("HASH EQUALITY FAIL");
          return false;
        }

        if (env.getMessage().compareTo("OK") == 0) {
          System.out.printf("File %s deleted successfully\n", filename);
        } else {
          System.out.printf("Error deleting file %s (%s)\n", filename, env.getMessage());
          return false;
        }
      }
    } catch (IllegalBlockSizeException ex) {
      ex.printStackTrace(System.err);
    } catch (BadPaddingException ex) {
      ex.printStackTrace(System.err);
    } catch (InvalidKeyException ex) {
      ex.printStackTrace(System.err);
    } catch (NoSuchAlgorithmException ex) {
      ex.printStackTrace(System.err);
    } catch (NoSuchPaddingException ex) {
      ex.printStackTrace(System.err);
    } catch (IOException e1) {
      e1.printStackTrace(System.err);
    } catch (ClassNotFoundException e1) {
      e1.printStackTrace(System.err);
    }

    return true;
  }
Beispiel #3
0
  public static void main(String[] args) {
    try {
      if (args[0].equals("-genkey")) {
        KeyPairGenerator pairgen = KeyPairGenerator.getInstance("RSA");
        SecureRandom random = new SecureRandom();
        pairgen.initialize(KEYSIZE, random);
        KeyPair keyPair = pairgen.generateKeyPair();
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(args[1]));
        out.writeObject(keyPair.getPublic());
        out.close();
        out = new ObjectOutputStream(new FileOutputStream(args[2]));
        out.writeObject(keyPair.getPrivate());
        out.close();
      } else if (args[0].equals("-encrypt")) {
        KeyGenerator keygen = KeyGenerator.getInstance("AES");
        SecureRandom random = new SecureRandom();
        keygen.init(random);
        SecretKey key = keygen.generateKey();

        // wrap with RSA public key
        ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
        Key publicKey = (Key) keyIn.readObject();
        keyIn.close();

        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.WRAP_MODE, publicKey);
        byte[] wrappedKey = cipher.wrap(key);
        DataOutputStream out = new DataOutputStream(new FileOutputStream(args[2]));
        out.writeInt(wrappedKey.length);
        out.write(wrappedKey);

        InputStream in = new FileInputStream(args[1]);
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        crypt(in, out, cipher);
        in.close();
        out.close();
      } else {
        DataInputStream in = new DataInputStream(new FileInputStream(args[1]));
        int length = in.readInt();
        byte[] wrappedKey = new byte[length];
        in.read(wrappedKey, 0, length);

        // unwrap with RSA private key
        ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
        Key privateKey = (Key) keyIn.readObject();
        keyIn.close();

        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.UNWRAP_MODE, privateKey);
        Key key = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);

        OutputStream out = new FileOutputStream(args[2]);
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, key);

        crypt(in, out, cipher);
        in.close();
        out.close();
      }
    } catch (IOException e) {
      e.printStackTrace();
    } catch (GeneralSecurityException e) {
      e.printStackTrace();
    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    }
  }