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I am trying to to download and decrypt an encrypted XML file.
I have implemented the download part and have tested with an
unencrypted file and it works fine.
However I now need to be able to download an XML file that has been
encrypted using AES and the key "XXXX"
So I am only concerned with decryption as the encryption on the XML
file is already done.
Here is my code so far:
public NodeList getXMLDoc(){
URL url;
NodeList nl = null;
try{
String xmlFeed = context.getString(R.string.xml_feed);
try {
url = new URL(xmlFeed);
URLConnection urlConnection;
urlConnection = url.openConnection();
HttpURLConnection httpConnection = (HttpURLConnection)
urlConnection;
int responseCode = httpConnection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
String bytes = toHex("XXXX");
SecretKeySpec skeySpec = new
SecretKeySpec(toByte(bytes), "AES");
try {
c.init(Cipher.DECRYPT_MODE, skeySpec);
//c.doFinal();
} catch (InvalidKeyException e) {
e.printStackTrace();
}
InputStream in = httpConnection.getInputStream();
CipherInputStream cis = new CipherInputStream(in,
c);
DocumentBuilderFactory dbf;
dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document dom = db.parse(cis);
Element docEle = dom.getDocumentElement();
nl = docEle.getElementsByTagName(TAG_CHAR);
}
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
}
finally{
}
return nl;
}
At the minute I am trying to decrypt the whole file using
CipherInputStream is this the correct approach?
My code above gives me the following exception:
WARN/System.err(5274): java.io.IOException: last block incomplete in
decryption
Is this a setup error or what might be causing this error?
Are there any tutorials on how to decrypt an XML file in Android/Java?
Am I going in the right direction as to how to decrypt the file or is
my code completely wrong?
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