private static void encryptFile(File file, EncryptedFormInformation formInfo)
throws IOException, EncryptionException {
File encryptedFile = new File(file.getParentFile(), file.getName() + ".enc");
if (encryptedFile.exists() && !encryptedFile.delete()) {
throw new IOException(
"Cannot overwrite " + encryptedFile.getAbsolutePath() + ". Perhaps the file is locked?");
}
// add elementSignatureSource for this file...
formInfo.appendFileSignatureSource(file);
RandomAccessFile randomAccessFile = null;
CipherOutputStream cipherOutputStream = null;
try {
Cipher c = formInfo.getCipher();
randomAccessFile = new RandomAccessFile(encryptedFile, "rws");
ByteArrayOutputStream encryptedData = new ByteArrayOutputStream();
cipherOutputStream = new CipherOutputStream(encryptedData, c);
InputStream fin = new FileInputStream(file);
byte[] buffer = new byte[2048];
int len = fin.read(buffer);
while (len != -1) {
cipherOutputStream.write(buffer, 0, len);
len = fin.read(buffer);
}
fin.close();
cipherOutputStream.flush();
cipherOutputStream.close();
randomAccessFile.write(encryptedData.toByteArray());
Log.i(t, "Encrpyted:" + file.getName() + " -> " + encryptedFile.getName());
} catch (Exception e) {
String msg = "Error encrypting: " + file.getName() + " -> " + encryptedFile.getName();
Log.e(t, msg, e);
e.printStackTrace();
throw new EncryptionException(msg, e);
} finally {
IOUtils.closeQuietly(cipherOutputStream);
if (randomAccessFile != null) {
randomAccessFile.close();
}
}
}
private static void writeSubmissionManifest(
EncryptedFormInformation formInfo, File submissionXml, List<File> mediaFiles)
throws EncryptionException {
Document d = new Document();
d.setStandalone(true);
d.setEncoding(UTF_8);
Element e = d.createElement(XML_ENCRYPTED_TAG_NAMESPACE, DATA);
e.setPrefix(null, XML_ENCRYPTED_TAG_NAMESPACE);
e.setAttribute(null, ID, formInfo.formId);
if (formInfo.formVersion != null) {
e.setAttribute(null, VERSION, formInfo.formVersion);
}
e.setAttribute(null, ENCRYPTED, "yes");
d.addChild(0, Node.ELEMENT, e);
int idx = 0;
Element c;
c = d.createElement(XML_ENCRYPTED_TAG_NAMESPACE, BASE64_ENCRYPTED_KEY);
c.addChild(0, Node.TEXT, formInfo.base64RsaEncryptedSymmetricKey);
e.addChild(idx++, Node.ELEMENT, c);
c = d.createElement(XML_OPENROSA_NAMESPACE, META);
c.setPrefix("orx", XML_OPENROSA_NAMESPACE);
{
Element instanceTag = d.createElement(XML_OPENROSA_NAMESPACE, INSTANCE_ID);
instanceTag.addChild(0, Node.TEXT, formInfo.instanceMetadata.instanceId);
c.addChild(0, Node.ELEMENT, instanceTag);
}
e.addChild(idx++, Node.ELEMENT, c);
e.addChild(idx++, Node.IGNORABLE_WHITESPACE, NEW_LINE);
if (mediaFiles != null) {
for (File file : mediaFiles) {
c = d.createElement(XML_ENCRYPTED_TAG_NAMESPACE, MEDIA);
Element fileTag = d.createElement(XML_ENCRYPTED_TAG_NAMESPACE, FILE);
fileTag.addChild(0, Node.TEXT, file.getName() + ".enc");
c.addChild(0, Node.ELEMENT, fileTag);
e.addChild(idx++, Node.ELEMENT, c);
e.addChild(idx++, Node.IGNORABLE_WHITESPACE, NEW_LINE);
}
}
c = d.createElement(XML_ENCRYPTED_TAG_NAMESPACE, ENCRYPTED_XML_FILE);
c.addChild(0, Node.TEXT, submissionXml.getName() + ".enc");
e.addChild(idx++, Node.ELEMENT, c);
c = d.createElement(XML_ENCRYPTED_TAG_NAMESPACE, BASE64_ENCRYPTED_ELEMENT_SIGNATURE);
c.addChild(0, Node.TEXT, formInfo.getBase64EncryptedElementSignature());
e.addChild(idx++, Node.ELEMENT, c);
FileOutputStream fout = null;
OutputStreamWriter writer = null;
try {
fout = new FileOutputStream(submissionXml);
writer = new OutputStreamWriter(fout, UTF_8);
KXmlSerializer serializer = new KXmlSerializer();
serializer.setOutput(writer);
// setting the response content type emits the xml header.
// just write the body here...
d.writeChildren(serializer);
serializer.flush();
writer.flush();
fout.getChannel().force(true);
writer.close();
} catch (Exception ex) {
ex.printStackTrace();
String msg =
"Error writing submission.xml for encrypted submission: "
+ submissionXml.getParentFile().getName();
Log.e(t, msg);
throw new EncryptionException(msg, ex);
} finally {
IOUtils.closeQuietly(writer);
IOUtils.closeQuietly(fout);
}
}