I have been working on this method for longer than i would like to admit and its becoming increasingly difficult to scan this over and over I clearly don't know what the problem is hence why I am posting.
OBJECTIVE: select file, encrypt file, upload file to server PROBLEM: lack of knowledge and resources out of ideas. Error exceptions ' java.lang.NullPointerException'
Im sure its something simple and the crypto guys know exactly whats going on if you would kindly offer your input so that I can learn and put the blocks together so to speak it would be much appreciated, thank you.
private byte[] getKeyBytes(final byte[] key) throws Exception {
byte[] keyBytes = new byte[16];
System.arraycopy(key, 0, keyBytes, 0, Math.min(key.length, keyBytes.length));
return keyBytes;
}
public Cipher getCipherEncrypt(final byte[] key) throws Exception {
byte[] keyBytes = getKeyBytes(key);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes);
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
return cipher;
}
// Working Upload Method To DropBox Cloud
public void uploadFile () throws DbxException, IOException, FileLoadException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException, InvalidParameterSpecException, ClassNotFoundException, NoSuchProviderException, InvalidAlgorithmParameterException, UnsupportedAudioFileException, LineUnavailableException, InterruptedException, ShortBufferException, Exception {
// autheticate if there is a accessToken here if not prompt to login by activating the drop method re-auth..
try{
phoneHome();
}catch(IOException e){
System.out.println("not saving accessToken");
JOptionPane.showMessageDialog(null, "Your Access Information Does Not Exist,\n Please Login"+
"Please Login By Clicking 'OK'");
drop(); // will run auth method for user to login
}
// user picks file to upload with JFileChooser
fc = new JFileChooser();
fc.setMultiSelectionEnabled(true);
fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
int dialog = fc.showSaveDialog(this);
if (dialog == JFileChooser.APPROVE_OPTION) {
inputFile = fc.getSelectedFile();
inputFile.getName();
inputFile.getAbsoluteFile();
String nameOf = inputFile.getName();
System.out.println(" File: " + inputFile);
try{
setTitle("Uploading File..");
/*
// Original needs to look like this before its accepted to dropbox via. upload
File selectedFile = new File(nameOf+inputFile);
inputStream = new FileInputStream(inputFile);
*/
//////////////////////////////////////////////ENCRYPTION NEW
Cipher cipher = getCipherEncrypt(key);
FileOutputStream fos = null;
CipherOutputStream cos = null;
FileInputStream fis = null;
try {
fis = new FileInputStream(inputFile);
fos = new FileOutputStream(outputFile);
cos = new CipherOutputStream(fos, cipher);
byte[] data = new byte[1024];
int read = fis.read(data);
while (read != -1) {
cos.write(data, 0, read);
read = fis.read(data);
System.out.println(new String(data, "UTF-8").trim());
}
cos.flush();
File finalFile = new File ("encryptedVersion"+outputFile);
FileInputStream finalFis = new FileInputStream (finalFile);
////////////////////////////////////////////////////ENCRYPTION NEW
uploadedFile = client.uploadFile( "/" +finalFile ,DbxWriteMode.add(), inputFile.length(), fis);
// Original uploadedFile = client.uploadFile( "/" +selectedFile ,DbxWriteMode.add(), inputFile.length(), inputStream);
System.out.println("Uploaded: " + uploadedFile.toString());
JOptionPane.showMessageDialog(null,"File Upload:" + uploadedFile.toString(),
"Success!", JOptionPane.WARNING_MESSAGE);
}finally{
cos.close();
fos.close();
fis.close();
}
}catch(IOException e){
e.printStackTrace();
JOptionPane.showMessageDialog(null,"Failed To Upload File",
"Attention", JOptionPane.WARNING_MESSAGE);
}
}
}
** problem that has arisen: how to get the encrypt methods out file to be uploaded into the dropbox
SOLUTION FOUND:
private byte[] getKeyBytes(final byte[] key) throws Exception {
byte[] keyBytes = new byte[16];
System.arraycopy(key, 0, keyBytes, 0, Math.min(key.length, keyBytes.length));
return keyBytes;
}
public Cipher getCipherEncrypt(final byte[] key) throws Exception {
byte[] keyBytes = getKeyBytes(key);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes);
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
return cipher;
}
public void encrypt(File in, File output, byte[] key) throws Exception {
Cipher cipher = getCipherEncrypt(key);
FileOutputStream fos = null;
CipherOutputStream cos = null;
FileInputStream fis = null;
try {
fis = new FileInputStream(in);
fos = new FileOutputStream(output);
cos = new CipherOutputStream(fos, cipher);
byte[] data = new byte[1024];
int read = fis.read(data);
while (read != -1) {
cos.write(data, 0, read);
read = fis.read(data);
System.out.println(new String(data, "UTF-8").trim());
}
cos.flush();
System.out.println("name"+ output);
} finally {
System.out.println("performed encrypt method now closing streams");
cos.close();
fos.close();
fis.close();
}
}
// Working Upload Method To DropBox Cloud
public void uploadFile () throws DbxException, IOException, FileLoadException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException, InvalidParameterSpecException, ClassNotFoundException, NoSuchProviderException, InvalidAlgorithmParameterException, UnsupportedAudioFileException, LineUnavailableException, InterruptedException, ShortBufferException, Exception {
// autheticate if there is a accessToken here if not prompt to login by activating the drop method re-auth..
try{
phoneHome();
}catch(IOException e){
System.out.println("not saving accessToken");
JOptionPane.showMessageDialog(null, "Your Access Information Does Not Exist,\n Please Login"+
"Please Login By Clicking 'OK'");
drop(); // will run auth method for user to login
}
// user picks file to upload with JFileChooser
fc = new JFileChooser();
fc.setMultiSelectionEnabled(true);
fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
int dialog = fc.showSaveDialog(this);
if (dialog == JFileChooser.APPROVE_OPTION) {
inputFile = fc.getSelectedFile();
inputFile.getName();
inputFile.getAbsoluteFile();
String nameOf = inputFile.getName();
System.out.println(" File: " + inputFile);
/* calling out inputFIle from out JFileChooser and now passing it into
our method and encrytping and outputing it.
*/
encrypt(inputFile, new File("Encrypted"),key);
File selected = new File ("Encrypted"+inputFile);
inputStream = new FileInputStream (selected);
uploadedFile = client.uploadFile( "/" +selected ,DbxWriteMode.add(), inputFile.length(), inputStream);
/*
File selectedFile = new File(nameOf+inputFile);
inputStream = new FileInputStream(inputFile);
*/
//uploadedFile = client.uploadFile( "/" +selectedFile ,DbxWriteMode.add(), inputFile.length(), inputStream);
setTitle("Uploading File..");
System.out.println("Uploaded: " + uploadedFile.toString());
JOptionPane.showMessageDialog(null,"File Upload:" + uploadedFile.toString(),
"Success!", JOptionPane.WARNING_MESSAGE);
}
}
