I'm trying to write a few helper methods to take care of reading and writing an encrypted file. I have two methods which successfully fulfill this and return an InputStream or an OutputStream (which are really the Cipher version) that I can use to read or write to the file. I have confirmed that these methods work peachy keen when wrapped with an Object stream and used to read and write an encrypted Object to file.
However, the problem arises when I try to read from an encrypted text file. I can verify that the String I feed it is being encrypted and written to the correct file, but when I try to read back from this file, the BufferedReader reports an EOF (null). The InputStream.available() method returns 0. I can assure that the file is there, is being found, and that the InputStream itself is not null. Can anybody tell me what might cause this?
Reading/Writing encrypted Object works beautifully (CorruptedStreamException is good here):
private static void testWriteObject() {
String path = "derp.derp";
Derp start = new Derp("Asymmetril: " + message, 12543, 21.4, false);
FilesEnDe.writeEncryptedObject(key, "derp.derp", start);
echo("original");
echo(">"+start);
Object o;
try {
ObjectInputStream ois = new ObjectInputStream(ResourceManager.getResourceStatic(path));
o = ois.readObject();
echo("encrypted");
echo(">"+o);
ois.close();
} catch (Exception e) {
e.printStackTrace();
}
o = FilesEnDe.readEncryptedObject(key, path);
echo("decrypted");
echo(">"+o);
}
Output:
original
>Asymmetril: WE CAME, WE SAW, WE CONQUERED.; 12543; 21.4; false
[RM] > Trying to load resource: derp.derp
java.io.StreamCorruptedException
[RM] > Trying to load resource: derp.derp
decrypted
>Asymmetril: WE CAME, WE SAW, WE CONQUERED.; 12543; 21.4; false
Trying to decrypt the text file doesn't (note that the encrypted text is readable):
private static void testWriteFile() {
String path = "EncryptedOut.txt";
BufferedReader bis1, bis2;
try {
BufferedOutputStream os = new BufferedOutputStream(FilesEnDe.getEncryptedOutputStream(key, path));
os.write(message.getBytes());
os.flush();
os.close();
} catch (IOException e1) {
e1.printStackTrace();
}
echo("original");
echo(">"+message);
try {
bis1 = new BufferedReader (new InputStreamReader(ResourceManager.getResourceStatic(path)));
echo("encrypted");
echo(">" + bis1.readLine());
bis1.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
InputStream is = FilesEnDe.getEncryptedInputStream(key, path);
InputStreamReader isr = new InputStreamReader(is);
bis2 = new BufferedReader (isr);
echo("bits in stream? " + is.available());
echo("decrypted");
echo(">"+bis2.readLine());
bis2.close();
} catch (IOException e) {
e.printStackTrace();
}
}
Output:
original
>WE CAME, WE SAW, WE CONQUERED.
encrypted
>¤ƒ]£¬Vß4E?´?ùûe
[RM] > Trying to load resource: EncryptedOut.txt
bytes in stream? 0
decrypted
>null
The code used to create the CipherInputStream:
public static InputStream getEncryptedInputStream(String key, String path) {
try {
InputStream is = ResourceManager.getResourceStatic(path);
SecretKeySpec keyspec = new SecretKeySpec(getHash(key),"AES");
Cipher c = Cipher.getInstance("AES");
c.init(Cipher.DECRYPT_MODE, keyspec);
return new CipherInputStream(is,c);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
}
return null;
}
THE PROBLEM OCCURS WHEN I TRY TO USE A CIPHERINPUTSTREAM TO DECRYPT THE FILE AND RETRIEVE THE ORIGINAL STRING.
