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();
}
}
}
